Apparatus for evaluating the distance of an object
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United States of America Patent
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-
Nov 8, 1988
Grant Date -
N/A
app pub date -
Apr 1, 1987
filing date -
May 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for detecting the distance of an object from a signal transmitter during radiation of a transmitter signal uses a first capacitor which is initially short-circuited by means of a first switch and subsequently is charged from a constant current source following an opening of the switch. Upon a reception of an echo signal, the charge of the first capacitor is transferred to a second capacitor by closing a second switch at the time of the echo signal reception. The charge on the second capacitor, which is proportional to the elapsed time between transmitted and received signals, is delivered to an output via a low pass filter with the output signal representing a distance measuring signal.
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