Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1993-03-16
1995-10-17
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356357, 356360, G01D 902
Patent
active
054595703
ABSTRACT:
A method and apparatus for performing various optical measurements is provided utilizing an optical coherence domain refrectometer (OCDR). A short coherence optical radiation source applies optical radiation through like optical paths to a sample and an optical reflector. The optical reflector is movable in accordance with a predetermined velocity profile to permit interferometric scanning of the sample, the resulting output having a Doppler shift frequency modulation. This output may be demodulated and detected to obtain desired measurements and other information. Additional information may be obtained by applying radiation from two or more sources at different wavelengths to the sample and reflector and by separately demodulating the resulting outputs before processing. Birefringent information may be obtained by polarizing the optical radiation used, by suitably modifying the polarization in the sample and reference paths and by dividing the output into orthogonal polarization outputs which are separately demodulated before processing.
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Fujimoto James G.
Huang David
Lin Charles P.
Puliafito Carmen A.
Schuman Joseph S.
Massachusetts Institute of Technology
Turner Samuel A.
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