Microwave proximity detector

Details Microwave proximity detector Microwave proximity detector

1976-03-15

1977-08-30

Krawozewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

040457273

ABSTRACT:
A non-contacting method and apparatus for proximity detection with negligible radiation loss utilizes a microwave junction essentially having propagating waves on one side and evanescent electromagnetic fields on the other. Perturbation of the evanescent fields by an object causes a variation in the reflection coefficient of the propagation mode which is dependent on the distance from the junction to the object. This variation can be detected by measuring the phase shift of the propagating reflected waves relative to a reference.

REFERENCES:
patent: 2498548 (1950-02-01), Howard

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