Optical spectrum analyzer and encoder using a modulated...

Details Optical spectrum analyzer and encoder using a modulated... Optical spectrum analyzer and encoder using a modulated...

G - Physics

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G01D 5/26 (2006.01) G01B 11/14 (2006.01) G01J 3/12 (2006.01) G01R 33/032 (2006.01) G01J 3/28 (2006.01) G01J 9/00 (2006.01) G02F 1/09 (2006.01) G02F 1/29 (2006.01)

Patent

CA 2149124

2149124 9411716 PCTABS00032 An apparatus and method of wavelength detection and parameter sensing uses a variable magnetic field applied to a Faraday effect thin magnetizable film to perform spectral analysis based on detected intensity distribution of diffracted light for known magnetic field strengths. The strength of the applied magnetic field can also be varied by change in a physical parameter relative to a fixed magnet in a magnetic circuit which generates a magnetic field about the grating to produce diffracted wavelengths which correspond to the parameter which influences the magnetic circuit.

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