US3656012A
Expired / Lapsed
US
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Method of generating unipolar and bipolar pulses
Assignee: United States Atomic Energy Commission
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Filing: 1971-02-02
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Granted: 1972-04-11
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Expires: 1991-02-02
Abstract
Abstract The method for generating bipolar and unipolar mechanical pulses is described. The unipolar pulses can be in a form of a single unipolar pulse or pairs of unipolar pulses of opposite polarity.
Inventors
- 👤 Norman E Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/04; G10K15/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A method of generating mechanical pulses from a transducer coupled to a load including the steps of: a. applying to said transducer an excitation voltage changing in amplitude from an initial value to a predetermined value during a first time period, b. maintaining said excitation voltage at said predetermined value during a second time period, and c. changing said excitation voltage across said transducer to a value proximate said initial value during a third time period, said excitation voltage during said third time period being formed of at least one and no more than two linear ramps, said third time period and said ramps being such that the amplitude of the signal from the transducer rear face reaching the load is substantially equal to the magnitude of the second and subsequent cycles of the signal from the transducer front face reaching the load and further is 180* out of phase with said second and subsequent cycles.
Claim 2
Independent Claim
156 words
A method of generating mechanical pulses from a transducer coupled to a load including the steps of: a. applying to said transducer an excitation voltage changing in amplitude from an initial value to a predetermined value during a first time period, b. maintaining said excitation voltage at said predetermined value during a second time period, and c. changing said excitation voltage across said transducer to a value proximate said initial value during a third time period, said excitation voltage during said third time period being formed of at least one and no more than two linear ramps, said third time period and said ramps being such that the amplitude of the signal from the transducer rear face reaching the load is substantially equal to the magnitude of the second and subsequent cycles of the signal from the transducer front face reaching the load and further is 180* out of phase with said second and subsequent cycles.
Claim 3
Dependent Claim
98 words
The method of generating mechanical pulses from the transducer of claim 1 wherein: a. the characteristic impedance of the backing material of said transducer is substantially zero, b. said excitation voltage is applied to said transducer during said first time period to change the amplitude from said initial value to said predetermined value at a time rate of change to inhibit generation of mechanical pulses from said transducer, and c. said excitation voltage across said transducer during said third time period is a single linear ramp with a duration equal to the resonant sinusoidal period of said transducer.
Claim 4
Dependent Claim
20 words
The method of generating mechanical pulses from the transducer of claim 2 wherein: a. said second time period is zero.
Claim 5
Dependent Claim
76 words
The method of generating mechanical pulses from the transducer of claim 1 wherein: a. said excitation voltage across said transducer during said first time period is a single linear ramp with a duration equal to the resonant sinusoidal period of said transducer, and b. said second time period during which said excitation transducer of is maintained at said predetermined value is sufficiently long to permit mechanical pulses thereby generated to be reduced below a particular magnitude.
Claim 6
Dependent Claim
20 words
The method of generating mechanical pulses from the transducer of claim 4 wherein: a. said second time period is zero.
Claim 7
Dependent Claim
106 words
The method of generating mechanical pulses from the transducer of claim 1 wherein: a. The characteristic impedance of the backing material of said transducer is substantially equal to the characteristic impedance of said transducer, b. said excitation voltage is applied to said transducer during said first time period to change the amplitude from said initial value to said predetermined value at a time rate of change to inhibit generation of mechanical pulses from said transducer, and c. said excitation voltage across said transducer during said third time period is a single linear ramp with a duration equal to one-half the resonant sinusoidal period of said transducer.
Claim 8
Dependent Claim
20 words
The method of generating mechanical pulses from the transducer of claim 6 wherein: a. said second time period is zero.
Claim 9
Dependent Claim
114 words
The method of generating mechanical pulses of claim 1 wherein: a. said excitation voltage across said transducer during said third time period is formed of two linear ramps with the duration of each of said ramps being equal to one-half the resonant sinsuoidal period of said transducer, and b. the ramp ratio k2/k1 is found by the formula k2/k1 sigma (Z0 - Z2/Z0 + Z2), where k1 and k2 are the ramp slope coefficients of each of the two linear ramps, sigma is the attenuation factor for one trip of a pressure wave across the transducer, Z0 is the characteristic impedance of the transducer and Z2 is the Impedance of the transistor backing material.
Claim 10
Dependent Claim
112 words
The method of generating mechanical pulses of claim 8 wherein: a. said second time period is zero, b. said excitation voltage across said transducer during said first time period is formed of two linear ramps with the duration of each of said ramps being equal to one-half the resonant sinusoidal period of said transducer, and c. the ramp ratio K2/k1 is found by the formula K2/k1 sigma (Z0 - Z2/Z0 +Z2), where k1 and k2 are the ramp slope coefficients, sigma is the attenuation factor for one trip of a pressure wave across the transducer, Z0 is the characteristic impedance of the transducer, Z2 is the impedance of the transistor backing material.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |