Optical pressure detector
First Claim
1. An optical pressure detector comprising:
- a multimode light guide affixed to a layer subjected to pressure and forming spatially periodic pressure points, said light guide being spatially periodically curved by the pressure on the layer,a light source and a light detector between which is mounted the light guide,an analyzer analyzing the light-detector output signals as a function of the pressure,wherein the light detector (5) covers an angle of aperture at the exit of the light guide (1) including only the lower-mode portion of the radiation field.
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Accused Products
Abstract
The invention relates to an optical pressure detector for instance in the form of an optical alarm with a multimode light guide (1) imbedded in a contact pad (2) subject to pressure, said light guide being curved by the compression of the contact pad (2). The light guide (1) is mounted between a light source and a light detector, an analyzer being present to analyze the output signals from the light detector changing through mode coupling as a function of the applied pressure, and to process them for instance into an alarm signal. The light detector covers an angle of aperture at the exit of the light guide (1), said angle only enclosing the radiation field in the range of lower-order modes of the light guide (1).
55 Citations
13 Claims
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1. An optical pressure detector comprising:
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a multimode light guide affixed to a layer subjected to pressure and forming spatially periodic pressure points, said light guide being spatially periodically curved by the pressure on the layer, a light source and a light detector between which is mounted the light guide, an analyzer analyzing the light-detector output signals as a function of the pressure, wherein the light detector (5) covers an angle of aperture at the exit of the light guide (1) including only the lower-mode portion of the radiation field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification