G - Physics – 02 – B
Patent
G - Physics
02
B
345/13, 356/95
G02B 5/20 (2006.01) G01D 5/26 (2006.01) G01K 11/14 (2006.01)
Patent
CA 1143073
ABSTRACT A method and resulting apparatus for implementing a unique optical sensor that is adapted to to interfaced with a low coat, compact fiber-optic transmission system to provide an accurate indication of a sensed physical parameter (e.g. temperature) of a remote sample. The sensor is fabricated so as to include a semiconductor material that has optical- wavelength-dependent filter characteristics that may be varied as a function, of a physical parameter such as temperature. In one embodiment, a graded optical filter fabricated by using thin-film deposition techniques on an amorphous semicon- ductor material, provides position responsive high-pass filter characteristics. Such filter characteristics are then utilized by moving a light source as a function of a physical parameter and generating an optical signal therefrom having a cutoff frequency dependent upon the position of the light source. In another embodiment, the temperature dependent frequency cutoff characteristics in the absorption edge of amorphous selenium, are utilized more directly in an optical temperature sensor. The optical utilization of amorphous semiconductor material is a particularly advantageous feature of the invention in reducing the cost and complexity of semiconductor optical filters.
344091
James Kenneth A.
Quick William H.
Strahan Virgil H.
Kirby Eades Gale Baker
Rockwell International Corporation
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