Piezoelectric ultrasonic apparatus and method for determining the distance from a predetermined point to a target
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United States of America Patent
Stats
-
Feb 4, 1986
Grant Date -
N/A
app pub date -
Mar 20, 1984
filing date -
Mar 20, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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