US3624712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic pulse echo thickness-measuring device
Assignee: SKYWITCH Inc A CORP
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Filing: 1969-07-22
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Granted: 1971-11-30
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Expires: 1989-07-22
Abstract
Abstract An ultrasonic thickness-measuring instrument having a dual transducer search unit wherein a transmitter-receiver transducer and a receiver transducer are mounted at an angle to provide overlapping beam patterns below the workpiece surface and are recessed to provide a fixed time delay. The transmitter-receiver transducer measures the distance to the surface, and the receiver transducer measures the distance to the back surface. The input of a receiver and ramp generator is alternately connected to each of the transducers, and the ramp function outputs are alternately connected to peak detectors to give two signals representative of the distance to the front surface and to the rear surface of the workpiece. The two signals are applied to a difference amplifier, and the difference output is digitized to provide a digital representation of workpiece thickness.
Inventors
- 👤 Frederick G Weighart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
G; G01; G01B; G01B17/00; G01B17/02; Y; Y10; Y10S; Y10S73/00; Y10S73/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
An ultrasonic testing device including: a search unit being adapted to engage the entrant surface of a workpiece; a first and second transducer being disposed in said search unit; a transmitter being coupled to said first transducer; a receiver being coupled to said second transduceR; gating means for alternately coupling said receiver to said first and to said second transducer; a function generator coupled to transmitter and to said receiver adapted to produce a first voltage and a second voltage, said first voltage being a function of a first time interval indicative of the time between the transmission of a pulse produced by said first transducer and the receipt of an echo pulse by said first transducer, said second voltage being a function of a second time interval indicative of the time between the transmission of a pulse produced by said second transducer and the receipt of an echo pulse by said second transducer; and difference means coupled to said function generator for producing an output signal being a function of the difference between said first and second time interval.
Claim 2
Dependent Claim
180 words
An ultrasonic testing device including: a search unit being adapted to engage the entrant surface of a workpiece; a first and second transducer being disposed in said search unit; a transmitter being coupled to said first transducer; a receiver being coupled to said second transduceR; gating means for alternately coupling said receiver to said first and to said second transducer; a function generator coupled to transmitter and to said receiver adapted to produce a first voltage and a second voltage, said first voltage being a function of a first time interval indicative of the time between the transmission of a pulse produced by said first transducer and the receipt of an echo pulse by said first transducer, said second voltage being a function of a second time interval indicative of the time between the transmission of a pulse produced by said second transducer and the receipt of an echo pulse by said second transducer; and difference means coupled to said function generator for producing an output signal being a function of the difference between said first and second time interval.
Claim 3
Dependent Claim
46 words
The testing device as defined in claim 1 and further including: first and second voltage-responsive means; and means for alternately coupling said first and second voltage-responsive means to said function-generating means, said first voltage-responsive means producing a second output signal in response to said second voltage.
Claim 4
Dependent Claim
25 words
The testing device as defined in claim 2 and further including analog-to-digital converter for producing a digital signal indicative of the thickness of the workpiece.
Claim 5
Dependent Claim
362 words
The combination of a pulser, a transmitter coupled to said pulser for transmitting at least a first and a second signal on each pulse from said pulser, a search unit having a first transducer and a second transducer, said first transducer being coupled to the transmitter and responsive to the signals therefrom to transmit ultrasonic energy into a workpiece and to receive said ultrasonic energy returned from the entrant surface of said workpiece, said second transducer being adapted to receive the energy transmitted by said transmitter and returned from the rear surface of said workpiece, a receiver, an input selector circuit having a first input circuit coupled to said first transducer, a second input circuit coupled to said second transducer and an output circuit coupled to said receiver, first means coupled to said input selector circuit and responsive to said transmitter for enabling said selector circuit to pass the signals from said transmitter and the first transducer of said search unit on the first signal from said transmitter and for enabling said selector circuit to pass the signals from said transmitter and return signals from said second transducer of said search unit on the second pulse from said transmitter, a linear ramp signal generator adapted to generate a linear ramp signal during the time a signal is applied thereto; second means coupled to said receiver and to said ramp signal generator for alternately passing signals to said linear ramp signal generator and enabled by the time durations between pulses received by said receiver, output means coupled to said linear ramp signal generator for providing a signal indicative of comparison of alternate signals received therefrom, an output selection circuit operable with said input selection circuit and having an input circuit coupled to said linear ramp signal generator and a first output circuit and a second output circuit, a first peak detector coupled to the first output circuit of said output selection circuit and including an output circuit, a second peak detector coupled to the second output circuit of said output selection circuit and including an output circuit, and a difference amplifier coupled to the output circuits of said first and second peak detectors.
Claim 6
Dependent Claim
362 words
The combination of a pulser, a transmitter coupled to said pulser for transmitting at least a first and a second signal on each pulse from said pulser, a search unit having a first transducer and a second transducer, said first transducer being coupled to the transmitter and responsive to the signals therefrom to transmit ultrasonic energy into a workpiece and to receive said ultrasonic energy returned from the entrant surface of said workpiece, said second transducer being adapted to receive the energy transmitted by said transmitter and returned from the rear surface of said workpiece, a receiver, an input selector circuit having a first input circuit coupled to said first transducer, a second input circuit coupled to said second transducer and an output circuit coupled to said receiver, first means coupled to said input selector circuit and responsive to said transmitter for enabling said selector circuit to pass the signals from said transmitter and the first transducer of said search unit on the first signal from said transmitter and for enabling said selector circuit to pass the signals from said transmitter and return signals from said second transducer of said search unit on the second pulse from said transmitter, a linear ramp signal generator adapted to generate a linear ramp signal during the time a signal is applied thereto; second means coupled to said receiver and to said ramp signal generator for alternately passing signals to said linear ramp signal generator and enabled by the time durations between pulses received by said receiver, output means coupled to said linear ramp signal generator for providing a signal indicative of comparison of alternate signals received therefrom, an output selection circuit operable with said input selection circuit and having an input circuit coupled to said linear ramp signal generator and a first output circuit and a second output circuit, a first peak detector coupled to the first output circuit of said output selection circuit and including an output circuit, a second peak detector coupled to the second output circuit of said output selection circuit and including an output circuit, and a difference amplifier coupled to the output circuits of said first and second peak detectors.
Claim 7
Dependent Claim
15 words
The combination of claim 4 wherein said first means and said second means are flip-flops.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |