US3690153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic distance amplitude correction unit
Assignee: Ex-Cell-O Corp
•
Filing: 1970-12-07
•
Granted: 1972-09-12
•
Expires: 1990-12-07
Abstract
Abstract An automatic distance amplitude correction device and circuit which automatically corrects for amplitude variations in signals such as caused by the attenuation of sound propagating through a test specimen. A signal is transmitted through a test specimen and the reflection is detected and used to control the time constant of an integrating circuit so that the signal applied to a compensating network for controlling the gain in the receiver is automatically adjusted as a function of the amplitude of the received signals.
Inventors
- 👤 Istvan M Matay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/44; G01N29/4463; G01N29/22; G01N29/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
An automatic diStance amplitude correcting device for a receiver for testing a specimen comprising: means for periodically transmitting a signal through said specimen; said receiver receiving said signal from said specimen; an automatic gain control element in said receiver; a multivibrator connected to said means for periodically transmitting a signal; an automatically variable time constant circuit receiving an output of said receiver and the output of said multivibrator; and a compensating network receiving the output of said automatically variable time constant circuit and supplying an output to said automatic gain control element in said receiver which comprises a voltage which exponentially decays at a rate depending on the output of said automatically variable time constant circuit.
Claim 2
Dependent Claim
116 words
An automatic diStance amplitude correcting device for a receiver for testing a specimen comprising: means for periodically transmitting a signal through said specimen; said receiver receiving said signal from said specimen; an automatic gain control element in said receiver; a multivibrator connected to said means for periodically transmitting a signal; an automatically variable time constant circuit receiving an output of said receiver and the output of said multivibrator; and a compensating network receiving the output of said automatically variable time constant circuit and supplying an output to said automatic gain control element in said receiver which comprises a voltage which exponentially decays at a rate depending on the output of said automatically variable time constant circuit.
Claim 3
Dependent Claim
85 words
An automatic distance amplitude circuit according to claim 1 wherein said automatically variable time constant circuit comprises: a capacitor with one side connected to the output of said multivibrator; a field effect transistor with its drain connected to the other side of said capacitor and to the input of said compensating network; and the gate of said field effect transistor connected to the output of said receiver to vary the impedance across the field effect transistor as a function of the output of said receiver.
Claim 4
Dependent Claim
31 words
An automatic distance amplitude circuit according to claim 2 including a resistor with a slide contact connected between the gate of said field effect transistor and the output of said receiver.
Claim 5
Dependent Claim
64 words
An automatic distance amplitude circuit according to claim 1 wherein said variable time constant circuit comprises: a pair of voltage variable capacitors connected in series between the input of said multivibrator and said compensating network; a resistor connected between ground and the input of said multivibrator; and an output of said receiver connected to the junction point between said pair of voltage variable capacitors.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |