Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1997-04-21
1999-05-11
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
7351401, 25022719, G01B9/02
Patent
active
059033495
ABSTRACT:
The interferometric fiber optic accelerometer is viewed as a mass-spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure. Fabrication of the optical fiber coils is accomplished by winding the optical fiber, with a specially designed chuck to form reference and sensing fiber coils which are then bonded to the flexural disk to form the accelerometer.
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Vohra et al., High Preformance Fiber Optic Accelerometers, Proc. 11th Optical Fiber Sensors Conf., Sapporo, Japan, May 1996.
Brown et al., Fiber Optic Flexural Disk Microphone, Fiber Optic and Laser Sensors VI SPIE vol. VI, pp. 172-182; 1988.
Dandridge Anthony
Danver Bruce
Tveten Alan
Vohra Sandeep T.
McDonnell Thomas E.
Stockstill Charles J.
The United States of America as represented by the Secretary of
Turner Samuel A.
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