Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-05-30
1999-10-19
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 25023113, 356356, 356395, G01B 902
Patent
active
059693428
ABSTRACT:
Displacement is measured using two overlaid parallel optic gratings as the sensing elements of a sensor head. Optic fibers are employed as the transmission media between the sensor head and a central signal processing unit. The light intensity signals of Moire fringes generated by the overlaid optic gratings are transmitted through optic fibers to the central signal processing unit. By digitally counting the number of Moire fringes, the changes in both direction and magnitude of the displacement are measured. A number of sensor heads employing the overlaid optic gratings as sensing elements are multiplexed through a common optic fiber link to comprise a multipoint sensor system. By similarly modifying the sensor head, this sensor system also measures other physical quantities such as strain, acceleration, and pressure.
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Chu Dong
Feng Maria Q.
Dawes Daniel L.
Lee John R.
Westin Edward P.
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