Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-06-24
1998-11-17
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2505593, 359 28, 73511, H01J 516
Patent
active
058379983
ABSTRACT:
A simple, novel and reliable two-dimensional, cantilever based fiber optic acceleration and vibration sensor, able to measure constant and/or variable acceleration, velocity, displacement, and frequency spectrum simultaneously in two perpendicular directions is presented. The sensor has a long live-span, high sensitivity, wide dynamic range and linear response in both directions. According to one aspect of the present invention, the two-dimensional fiber optic accelerometer includes an elongated light conducting elastic member with a round cross-section which first end is coupled to a light emitting source. The elastic member can be an optical fiber, and is mounted on a support structure in such a way that its second end forms a cantilever. A lens focuses the light irradiated from the elastic member onto a dual axis position photosensor. Thus, the lens, the elastic member and the photosensor form an optical lever. Under acceleration the elastic member flexes and the focused light spot moves over the photosensor sensitive area in accordance with the applied acceleration. The optical lever magnifies the light spot displacement. A signal processing unit supplied with output signals from the photosensor computes the deflection amplitude and direction of the second end of the elastic member relative to the support structure. Then the unit generates signals proportional to the components of the acceleration, velocity, displacement, and frequency spectrum of the moving object in two perpendicular directions. By using a combination of two or more sensors, an angular acceleration and velocity can be measured as well.
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Petko Dinev, May 1995, "A two-dimensional fiber-optical vibration sensor" publ. Measurement Sci. and Technology, pp. 1395-1398.
Petko Dinev, Jan. 1996, "Two-dimensional fiber-optic accelerometer" publ. Rev. Sci. Instrum. v 67, #1, Sep. 1995, pp. 288-290.
Dinev Petko D.
Dinev Tamara S.
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