PatentDOI
Piezoelectric ultrasonic apparatus and method for determining the distance from a predetermined point to a target
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TLDR
In this paper, an AND gate is connected to the comparator and to the enabled trigger output for disabling detection during transmission of the transmitter pulse and for producing a time interval during which the analog output is valid, when enabled.Abstract:
A distance-determining detector and method. A piezoelectric ultrasonic transceiver sends out pulses and receives their reflection and produces an analog output and a trigger output. The analog output is given effect only when it exceeds a threshold level, as shown by a comparator. The trigger output is used for disabling detection during transmission of the transmitter pulse and for producing a time interval during which the analog output is valid, when enabled. An AND gate is connected to the comparator and to the enabled trigger output. Clock pulses are counted, and a flip-flop circuit is connected to the counter and to the output from the AND gate. A multiplying digital-to-analog converter is connected to the flip-flop circuit for determining the distance. There may also be temperature compensation and scaling for the converter for validating the output thereof over a wide range of temperatures.read more
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References
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Noncontact ultrasonic interface viscosity and percent solid detecting device
TL;DR: In this article, the authors present a system that allows a ULTRASONIC PULSE to be transmitted through the CONTAINER WALL, ACROSS the contents, and this articleLECTed off the OPPOSITE CONTAINer WALL back to the TRANSDUCER.
Patent
Ultrasonic apparatus and method for nondestructively measuring the physical properties of a sample
TL;DR: The physical properties of a sample are measured by generating a collimated beam of pulsed ultrasound and transmitting the ultrasound at an incident angle relative the sample greater than the longitudinal-ultrasonic-wave critical angle.
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Method and apparatus for ultrasonic nondestructive testing of workpieces with automatic compensation for the probe, workpiece material, and temperature
TL;DR: In this paper, a method and apparatus for ultrasonic nondestructive testing of workpieces include automatic compensation of echo responsive electrical signals commensurate with preprogrammed test parameters.
PatentDOI
Ultrasonic test method and apparatus with coupling liquid temperature compensation
TL;DR: In this article, a workpiece is coupled to the ultrasonic transducer by a liquid coupling medium and the temperature of the liquid affects precise measurement of the workpiece as the acoustic velocity of a liquid changes with temperature.
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Ultrasonic wall thickness measurement
TL;DR: In this paper, a method and apparatus for ultrasonic measurement of average wall thickness is described. But this method is particularly useful where there is continuous relative motion with respect to measured wall, and where surface of wall is irregular.