Patent US3968680A successfully refreshed from Google Patents.
US3968680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band ultrasonic transducer and its uses
Assignee: Individual
•
Filing: 1975-02-25
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Granted: 1976-07-13
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Expires: 1995-02-25
Abstract
Abstract A wide-band ultrasonic transducer comprising: a body of revolution; at least two electrodes connected to the body of revolution; the body of revolution being made of a material having piezoelectric properties; the body of revolution having one flat end face surface, whereas its other end face surface, opposite to the flat end face surface, is profiled. The profile of the profiled end face surface of the body of revolution is made in accordance with the following relationship: h'= -ρ.sup.. h.sup.. k(f) Where ρ is the radial coordinate; radial h is the thickness of the transducer, corresponding to the radical coordinate; k(f) is the frequency characteristic of the transducer within the operating frequency range; and h' is the derivative of the transducer thickness with respect to the radial coordinate. The electrodes are applied onto the flat end face surface and the profiled end face surface of the body of revolution.
Inventors
- 👤 Alexeli Kharitonovich Vopilkin
- 👤 Igor Nikolaevich Ermolov
- 👤 Vladimir Ivanovich Ryzhov-Nikonov
- 👤 Valery Ivanovich Ivanov
- 👤 Vladimir Izidorovich Ryk
- 👤 Viktor Vasilievich Rakhmanov
- 👤 Vladimir Dmitrievich Korolev
- 👤 Petr Yakovlevich Krasinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:23
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2437; G01N29/245; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
140 words
A wide-band ultrasonic transducer comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled; the profile of said profiled end face surface of said body of revolution being made in accordance with the following relationships: h'=-ρ.sup.. h.sup.. k (f) where ρ is the radial coordinate; h is the thickness of said transducer, corresponding to the radial coordinate; k(f) is the frequency characteristic of said transducer; h' is the derivative of the thickness h of the transducer with respect to the radial coordinate; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 2
Dependent Claim
140 words
A wide-band ultrasonic transducer comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled; the profile of said profiled end face surface of said body of revolution being made in accordance with the following relationships: h'=-ρ.sup.. h.sup.. k (f) where ρ is the radial coordinate; h is the thickness of said transducer, corresponding to the radial coordinate; k(f) is the frequency characteristic of said transducer; h' is the derivative of the thickness h of the transducer with respect to the radial coordinate; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 3
Dependent Claim
136 words
A wide-band ultrasonic transducer having a uniform conversion frequency characteristic within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the relationship: h = e .sup.-.sup.a .sup.ρ.spsp.2 .sup.+ c where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profile end face surface of said body of revolution.
Claim 4
Dependent Claim
136 words
A wide-band ultrasonic transducer having a uniform conversion frequency characteristic within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the relationship: h = e .sup.-.sup.a .sup.ρ.spsp.2 .sup.+ c where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profile end face surface of said body of revolution.
Claim 5
Dependent Claim
136 words
A wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezo-electric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a.sup.. ρ.sup.2, wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 6
Dependent Claim
136 words
A wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezo-electric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a.sup.. ρ.sup.2, wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 7
Dependent Claim
142 words
A wide-band ultrasonic transducer having a conversion frequency characteristic rising in proportion to the square of the frequency within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the relationship: h = c - a.sup.. ρ where a and c are constants determined by the operating frequency range; ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 8
Dependent Claim
142 words
A wide-band ultrasonic transducer having a conversion frequency characteristic rising in proportion to the square of the frequency within the operating frequency range and comprising: a body of revolution; at least two electrodes connected to said body of revolution; said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the relationship: h = c - a.sup.. ρ where a and c are constants determined by the operating frequency range; ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 9
Dependent Claim
197 words
A probe for nodestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper, a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer comprising a body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h' = - ρ.sup.. h.sup.. k (f) where ρ is the radial coordinate; h is the thickness of said body of revolution, corresponding to the radial coordinate; k(f) is the frequency characteristic of the transducer; h' is the derivative of the thickness h of the body of revolution with respect to the radial coordinate ρ; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface facing said wide-band ultrasonic transducer to which is congruent with the latter's profiled end face surface.
Claim 10
Dependent Claim
197 words
A probe for nodestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper, a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer comprising a body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h' = - ρ.sup.. h.sup.. k (f) where ρ is the radial coordinate; h is the thickness of said body of revolution, corresponding to the radial coordinate; k(f) is the frequency characteristic of the transducer; h' is the derivative of the thickness h of the body of revolution with respect to the radial coordinate ρ; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface facing said wide-band ultrasonic transducer to which is congruent with the latter's profiled end face surface.
Claim 11
Dependent Claim
45 words
A probe as claimed in claim 5, comprising: a ferro-magnetic core with an inductance coil wound therearound, said coil forming, together with said wide-band ultrasonic transducer, an oscillatory circuit; a permanent magnet installed in the gap of said ferromagnetic core and adapted for axial movement.
Claim 12
Dependent Claim
195 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a uniform frequency characteristic within the operating frequency range, comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h = e.sup.-.sup.a .sup.ρ.spsp.2 .sup.+.sup.c where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate, and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface, facing said wide-band ultrasonic transducer, which is congruent with the latter's profiled end face surface.
Claim 13
Dependent Claim
195 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a uniform frequency characteristic within the operating frequency range, comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h = e.sup.-.sup.a .sup.ρ.spsp.2 .sup.+.sup.c where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate, and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface, facing said wide-band ultrasonic transducer, which is congruent with the latter's profiled end face surface.
Claim 14
Dependent Claim
45 words
A probe as claimed in claim 7, comprising: a ferro-magnetic core having an inductance coil wound therearound, said coil forming, together with said wide-band ultrasonic transducer, an oscillatory circuit; a permanent magnet installed in the gap of said ferromagnetic core and adapted for axial movement.
Claim 15
Dependent Claim
198 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h = c - a.sup.. ρ.sup.2 where a and c are constants determined by the operating frequency range; ρ is the radial coordinate; and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface facing said wide-band ultrasonic transducer which is congruent with the latter's profiled end face surface.
Claim 16
Dependent Claim
198 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made according to the following relationship: h = c - a.sup.. ρ.sup.2 where a and c are constants determined by the operating frequency range; ρ is the radial coordinate; and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end face surface; said protector having a surface facing said wide-band ultrasonic transducer which is congruent with the latter's profiled end face surface.
Claim 17
Dependent Claim
45 words
A probe as claimed in claim 9, comprising: a ferromagnetic core having an inductance coil wound therearound, said coil forming, together with said wide-band ultrasonic transducer, an oscillatory circuit; a permanent magnet installed in the gap of said ferromagnetic core and adapted for axial movement.
Claim 18
Dependent Claim
197 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a conversion frequency within the operating frequency range and comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end surface; said protector having a surface facing said wide-band ultrasonic transducer which is congruent with the latter's profiled end face surface.
Claim 19
Dependent Claim
197 words
A probe for nondestructive ultrasonic checking, comprising: a housing; a damper arranged in said housing; a wide-band ultrasonic transducer connected to said damper; a protector connected to said wide-band ultrasonic transducer; said wide-band ultrasonic transducer having a conversion frequency within the operating frequency range and comprising: a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end surface and said profiled end face surface of said body of revolution; said wide-band ultrasonic transducer facing said damper with its flat end surface; said protector having a surface facing said wide-band ultrasonic transducer which is congruent with the latter's profiled end face surface.
Claim 20
Dependent Claim
45 words
A probe as claimed in claim 11, comprising: a ferromagnetic core having an inductance coil wound therearound, said coil forming, together with said wide-band ultrasonic transducer, an oscillatory circuit; a permanent magnet installed in the gap of said ferromagnetic core and adapted for axial movement.
Claim 21
Independent Claim
206 words
A device for nondestructive ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; and wide-band ultrasonic transducer comprising a body of revolution, body of revolution being made of a meterial possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h' = -ρ .sup.. h.sup.. k (t), where ρ is the radial coordinate; h is the thickness of said body of revolution, corresponding to the radial coordinate; k(f) is the frequency characteristic of the transducer; h' is a derivative of the thickness of h of the body of revolution with respect to the radial coordinate ρ; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 22
Independent Claim
206 words
A device for nondestructive ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; and wide-band ultrasonic transducer comprising a body of revolution, body of revolution being made of a meterial possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h' = -ρ .sup.. h.sup.. k (t), where ρ is the radial coordinate; h is the thickness of said body of revolution, corresponding to the radial coordinate; k(f) is the frequency characteristic of the transducer; h' is a derivative of the thickness of h of the body of revolution with respect to the radial coordinate ρ; said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 23
Independent Claim
208 words
A device for nondestructive checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a uniform conversion frequency characteristic within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = e .sup.-.sup.a .sup.ρ.spsp.2 .sup.+c, where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied into said flat end surface and said profiled end face surface of said body of revolution.
Claim 24
Independent Claim
208 words
A device for nondestructive checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a uniform conversion frequency characteristic within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = e .sup.-.sup.a .sup.ρ.spsp.2 .sup.+c, where a and c are constant values determined by the operating frequency range; ρ is the radial coordinate and h is the thickness of the transducer corresponding to the radial coordinate, said electrodes being applied into said flat end surface and said profiled end face surface of said body of revolution.
Claim 25
Independent Claim
210 words
A device for wide-band ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ.sup.2 wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 26
Independent Claim
210 words
A device for wide-band ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide-band ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a linearly rising frequency characteristic within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end face surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ.sup.2 wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face surface of said body of revolution.
Claim 27
Independent Claim
217 words
A device for nondestructive ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide band-ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a conversion frequency characteristic rising in proportion to the square of the frequency within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ; wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face body of of said body revolution.
Claim 28
Independent Claim
217 words
A device for nondestructive ultrasonic checking, comprising: an oscillator of probing frequency-modulated oscillations; a wide band-ultrasonic transducer connected to an output of said oscillator of probing frequency-modulated oscillations; a wide-band receiving unit connected to said wide-band ultrasonic transducer; an intrapulse frequency modulation oscillator connected to said wide-band ultrasonic transducer; a signal processing unit connected to said wide-band receiving unit; a smoothing filter placed between said wide-band ultrasonic transducer and said signal processing unit; said wide-band ultrasonic transducer having a conversion frequency characteristic rising in proportion to the square of the frequency within the operating frequency range and comprising a body of revolution, at least two electrodes connected to said body of revolution, said body of revolution being made of a material possessing piezoelectric properties and having one flat end surface, its other end face surface, opposite said flat end face surface, being profiled, the profile of said profiled end face surface being made in accordance with the following relationship: h = c - a .sup.. ρ; wherein a and c are constants determined by the operating frequency range, ρ is the radial coordinate, and h is the thickness of said transducer corresponding to the radial coordinate, said electrodes being applied onto said flat end face surface and said profiled end face body of of said body revolution.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |