Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Patent
1996-04-18
2000-12-26
Kim, Robert
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
356478, G01B 902
Patent
active
06166815&
ABSTRACT:
A fiber optic interferometric sensor (150) having constantly high sensitivity by use of two lasers (152, 154) that simultaneously output at first and second wavelengths. By judicious choice of the wavelengths, the optical path length difference between the two interferometer paths (164, 166) can be kept near the maximum slope of the interference fringes for one or the other of the wavelengths. The output from the interferometer (160) is divided between first and second detector arms (170, 130). A filter (172) in the first detector arm passes the first wavelength and rejects the second. A filter (182) in the second detector arm passes the second wavelength and rejects the first. A first detector (174) at the output of the first detector arm reads the interference pattern at the first wavelength. A second detector arm reads the interference pattern at the second wavelength.
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Chang David B.
Shih I-Fu
Vali Victor
Kim Robert
Lenzen, Jr. Glenn H.
Raytheon Company
Schubert William C.
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