Optical spectrum analyzer and encoder using a modulated phase gr

Details Optical spectrum analyzer and encoder using a modulated phase gr Optical spectrum analyzer and encoder using a modulated phase gr

1992-11-16

1995-05-02

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356334, 356308, 25022723, 3242441, G01J 328

Patent

active

054124697

ABSTRACT:
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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