Apparatus for evaluating the distance of an object

Details Apparatus for evaluating the distance of an object Apparatus for evaluating the distance of an object

1987-04-01

1988-11-08

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

307234, 324 60C, 367 99, 367118, G01S 1346

Patent

active

047836210

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.

REFERENCES:
patent: 3685909 (1972-08-01), Schwartz
patent: 4380764 (1983-04-01), Connors
patent: 4527113 (1985-07-01), Hillerich

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