Electronic phase comparison apparatus for the remote measurement

Details Electronic phase comparison apparatus for the remote measurement Electronic phase comparison apparatus for the remote measurement

1977-03-25

1978-02-21

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

040755550

ABSTRACT:
A continuous wave, phase measurement system which provides at least an order of magnitude improvement in accuracy over modulated carrier systems is disclosed for the determination of the thicknesses of layered targets consisting of a known number of dielectric layers, each of a known maximum thickness. This system uses related frequencies such as the fundamental and its harmonics to establish a multi-harmonic coherence relationship whereby a homodyne phase reference between harmonics can be conserved and information extracted from just the received and not the transmitted signals. Consequently doppler effects due to motion between the target and the apparatus, as well as severe local oscillator stability and drift limitations are avoided, and thus this system can measure remote target parameters by interferometric techniques without the distance being a constraint.

REFERENCES:
patent: 3093825 (1963-06-01), Allen
patent: 3430139 (1969-02-01), Schluter

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