Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1997-04-08
1998-09-15
Font, Frank G.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2100
Patent
active
058087303
ABSTRACT:
A device is provided for measuring angular displacement and rotational movement of a shaft or linear displacement of an object comprising a light source, a Multichannel Fiber Optic Bundle, an optical code wheel or linear scale with optical tracks for light modulation, including typically a raster and a reference mark, a system of photodetectors, amplifiers, comparators of analog signals and a digital electronic block. The device forms a sequence of electric pulses whose number is proportional to displacement, a set of pulses indicating zero position of the disk, and also a logic signal indicating the direction of the displacement. A multichannel fiber optic bundle provides channels for the transmission and collection of light from the light source to the sensing site and back to the photodetectors and for light intensity monitoring of the source. Special randomization of the fibers at the sensing element end of the multichannel fiber optic bundle into two or more channels and modulating the collected light signals by a raster splits the collected light signal into at least two channels and introduces a phase difference of 90.degree. between the split channels. The electronic components of the device are connected with the sensing element with a multichannel fiber optic cable or the directly by the multichannel fiber optic bundle, which removes them from the often harsh environments surrounding the sensing element. This provides an important advantage for many practical applications over the prior art.
REFERENCES:
patent: 4651327 (1987-03-01), Fujita
patent: 4774494 (1988-09-01), Extance et al.
patent: 4901072 (1990-02-01), Fox
patent: 5453838 (1995-09-01), Danielian e al.
Avacian Alexej
Danielian George
CeramOptec Industries Inc.
Font Frank G.
Ratliff Reginald A.
Skutnik Bolesh J.
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