Microwave proximity sensor

Details Microwave proximity sensor Microwave proximity sensor

1986-12-24

1989-08-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 711, 340686, G01N 2700

Patent

active

048620610

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: 3757330 (1973-09-01), Hotston
patent: 4045727 (1977-08-01), Yu et al.
patent: 4346383 (1982-08-01), Woolcock et al.
patent: 4359683 (1982-11-01), Chivers
patent: 4538124 (1985-08-01), Morrison

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