Measuring and testing – Vibration – By mechanical waves
Patent
1984-03-20
1986-02-04
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73610, 367122, 310315, G01N 2900
Patent
active
045677662
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.
REFERENCES:
patent: 3512399 (1970-05-01), Weinbaum
patent: 3553636 (1971-01-01), Baird
patent: 3697936 (1972-10-01), Zacharias, Jr. et al.
patent: 3720098 (1973-03-01), Dixon
patent: 3808879 (1974-05-01), Rogers
patent: 4102205 (1978-07-01), Pies et al.
patent: 4254660 (1981-03-01), Prause
patent: 4480474 (1984-11-01), Kazama et al.
Birmiel Howard A.
Blackwelders
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