US3783309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal generating device for use with a structure which is subjected to a range of vibrations
Assignee: Columbia Research Laboratories Inc
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Filing: 1972-08-07
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Granted: 1974-01-01
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Expires: 1992-08-07
Abstract
Abstract The present invention employs a piezo-electric crystal means which is supported by nonrigid material within a housing device. The housing device is adapted to be rigidly held by a vibrating body. The piezo-electric crystal means is coupled to a source of pressure signals which vary in frequency in response to temperature variations and said crystal means is further coupled to an electronic network to provide signals thereto which are converted into pulses whose repetition rate is commensurate with the frequency of said pressure signals. The vibration experience to which the housing and therefore the piezo-electric crystal means is subjected does not cause the piezo-electric crystal means to generate high amplitude electrical signals (noise) because the energy of the vibrations is substantially absorbed by the non-rigid material. In addition the electronic network provides a flat response over a dynamic range that includes the pressure signals generated by the temperatures of the device being monitored. Accordingly, the signals from the pressure source can be readily detected and therefore are readily usable for their intended purpose.
Inventors
- 👤 V Alibert
- 👤 T Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/22; G01K1/00; G01K1/02; G01K1/024; G01K13/00; G01K13/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
279 words
A signal generating device which generates signals in response to pressures applied thereto and which is employed with a structure having hot gases pass therethrough and which is subjected to a range of vibrations comprising in combination: piezo-electric crystal means; first rigid means having a diaphragm at one end thereof and having a cavity therein, said piezo-electric crystal means disposed in said cavity of said first rigid means and in abutment with said diaphragm; second rigid means having a cavity therein and having first and second apertures, said first rigid means disposed in said cavity of said second rigid means, said first and second apertures extending from said cavity to respectively first and second outer positions of said second rigid means, said first aperture further disposed to lie in close proximity to said diaphragm and adapted to provide pressure signals thereto; nonrigid means disposed in said cavity of said second rigid means to support said first rigid means located therein, said non-rigid means characterized by having the capacity to absorb the vibrations to which said second rigid means is subjected over said range of vibrations, whereby said first rigid means has virtually no vibrations in response to said range of vibrations of said second rigid means; fluidic oscillator means having a sampling probe and capable of transmitting signals having frequencies representative of the temperatures of said hot gases and coupled to said first aperture to transmit pressure signals therethrough to said diaphragm in response to said hot gases being passed over said sampling probe; and electrical signal conducting means connected to said piezoelectric crystals to transmit signals generated thereby in response to pressure signals applied through said first aperture.
Claim 2
Dependent Claim
279 words
A signal generating device which generates signals in response to pressures applied thereto and which is employed with a structure having hot gases pass therethrough and which is subjected to a range of vibrations comprising in combination: piezo-electric crystal means; first rigid means having a diaphragm at one end thereof and having a cavity therein, said piezo-electric crystal means disposed in said cavity of said first rigid means and in abutment with said diaphragm; second rigid means having a cavity therein and having first and second apertures, said first rigid means disposed in said cavity of said second rigid means, said first and second apertures extending from said cavity to respectively first and second outer positions of said second rigid means, said first aperture further disposed to lie in close proximity to said diaphragm and adapted to provide pressure signals thereto; nonrigid means disposed in said cavity of said second rigid means to support said first rigid means located therein, said non-rigid means characterized by having the capacity to absorb the vibrations to which said second rigid means is subjected over said range of vibrations, whereby said first rigid means has virtually no vibrations in response to said range of vibrations of said second rigid means; fluidic oscillator means having a sampling probe and capable of transmitting signals having frequencies representative of the temperatures of said hot gases and coupled to said first aperture to transmit pressure signals therethrough to said diaphragm in response to said hot gases being passed over said sampling probe; and electrical signal conducting means connected to said piezoelectric crystals to transmit signals generated thereby in response to pressure signals applied through said first aperture.
Claim 3
Dependent Claim
17 words
A signal generating device according to claim 1, wherein said nonrigid mEans is a plurality of O-rings.
Claim 4
Dependent Claim
18 words
A signal generating device according to claim 1, wherein said nonrigid means is a mass of silicon rubber.
Claim 5
Dependent Claim
63 words
A signal generating device according to claim 1, wherein said piezo-electric crystal means includes two donut-shaped piezo-electric crystals mounted in abutment on opposite sides of a common collector and respectively poled whereby each of the ends of said piezo-electric crystals which are in abutment with said common collector develop the same voltage polarity signals in response to pressure signals applied to said diaphragm.
Claim 6
Dependent Claim
47 words
A signal generating device according to claim 1, wherein there is further included circuitry means connected to said electrical signal conducting means to receive signals therefrom and filter said signals to provide a flat signal response over a predetermined bandwidth of pressure signals applied to said diaphragm.
Claim 7
Dependent Claim
36 words
A signal generating device according to claim 5, wherein said circuitry means further includes means to convert said filtered signals into pulse signals whose repetition rate represents the frequency of pressure signals applied to said diaphragm.
Claim 8
Dependent Claim
30 words
A signal generating device according to claim 1, wherein said second rigid means is formed to be secured to a structure which is being subjected to a range of vibrations.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |