Microwave proximity sensor

Details Microwave proximity sensor Microwave proximity sensor

1986-12-24

1989-07-04

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324 585C, 333159, 333161, 340552, 361179, G01N 2200

Patent

active

048454222

ABSTRACT:
The invention relates to a type of proximity sensor. In one form, two sinusoidal signals travel along two transmission lines near an object. When the distance between one or both of the lines and the object changes, the speed of travel of one or both of the signals changes. There is a correlation between the speed change and the distance, thus allowing one to infer distance from speed change. One way to measure the speed change is to measure the phase relationship between the two signals.

REFERENCES:
patent: 3181091 (1965-04-01), Augustine et al.
patent: 3656179 (1972-04-01), DeLoach
patent: 3757330 (1973-09-01), Hotston
patent: 4123702 (1978-10-01), Kinanen et al.
patent: 4123703 (1978-10-01), Robinson
patent: 4398161 (1983-08-01), Lamb et al.
patent: 4520308 (1985-05-01), Rohde et al.
patent: 4538124 (1985-08-01), Morrison
patent: 4581595 (1986-04-01), Silagi

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