Sensing method and apparatus

Details Sensing method and apparatus Sensing method and apparatus

1996-11-15

1998-09-29

Font, Frank G.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 355, 385 12, G01B 902

Patent

active

058152660

ABSTRACT:
The invention is a method and apparatus for determining the phase difference of light waves after propagating through each of one or more two-path pairs, a two-path pair being two optical transmission paths connecting a common entry point to a common exit point. Coherent light pulses of predetermined duration are fed into the entry point of each two-path pair in a group of two-path pairs at predetermined time intervals, the pulse duration being subdivided into a plurality of predetermined time segments. The light has a different frequency during each time segment. The light pulses at the exit points of the two-path pairs are delayed by predetermined time increments and then combined into a combination light signal. The combination light signal is converted into an electrical signal, the amplitude of the electrical signal as a function of time being proportional to the combination-light-signal power as a function of time. The phase difference for each two-path pair is determined from amplitude values of the electrical signal.

REFERENCES:
patent: 5216532 (1993-06-01), Taylor

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