Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
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
Glover Gary H.
Yu Se Puan
Campbell Donald R.
Cohen Joseph T.
General Electric Company
Krawozewicz Stanley T.
Squillaro Jerome C.
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