G - Physics – 01 – N
Patent
G - Physics
01
N
324/42, 343/45
G01N 22/00 (2006.01) G01B 7/06 (2006.01) G01R 25/02 (2006.01)
Patent
CA 1075311
ABSTRACT OF THE DISCLOSURE 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.
290504
Chudobiak Walter J.
Makios Vassilios
Wight James S.
Canadian Patents And Development
Her Majesty The Queen In Right Of Canada
LandOfFree
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