Optical sensing devices

Details Optical sensing devices Optical sensing devices

1983-06-13

1985-06-11

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

250227, G01B 902

Patent

active

045224951

ABSTRACT:
Optical sensing devices comprising dual chamber apparatii which use signal and reference light beams together with interferometric methods for detection of physical quantities of interest. The signal part of the chamber experiences the effects of a particular physical quantity to be measured which produces variations in the optical length of the light beam by movement of a mirror, thereby modulating that beam in proportion thereto. Concurrently, the reference beam, of equal pathlength, is passed through an adjacent chamber, isolated from such effects. The modulated signal beam and unmodulated reference beam are then combined to form a fringe pattern, the zero and first order fringes which are superimposed on apertures of an optical fibers, which carry the resultant light beams to a photodetectors for converting the optical signals to proportional electrical signals.

REFERENCES:
patent: 4422167 (1983-12-01), Shajenko
patent: 4442350 (1984-04-01), Rashleigh
Glatzel et al., "Temperature Measurement Technique Using Fresnel Interfere Technique", IBM Tech. Discl. Bull., vol. 20, No. 11A, pp. 4571-4572, 4/78.

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