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专利名称：Optical analog-to-digital converter and
transducer
发明人：Samuel K. Reid,Dan D. Chen申请号：US07/0823申请日：19870805公开号：US04831376A公开日：190516
摘要：The present invention relates to an optical laser analog-to- digital (A/D)converter and the use of such a converter as a transducer. In a first embodiment of theinvention, the converter consists of a source which produces a coherent beam of lightthat is passed through a lens system to produce a line or bar of light. The bar of lightpasses through a coded optical mask which is made of a thin transparent material with abinary or gray code printed thereon. The mask is mounted to an object whose movementis to be detected. The mask may also be configured in the form of a circle and mountedto a motor shaft to sense motor rotational displacement, RPM or velocity. As the maskmoves, the imprinted pattern changes according to the coding on the mask. The portionof the light that passes through the mask strikes the target of a moving recording media.In another embodiment, the bar of light passes through a transparent media thatchanges in optical qualities to deflect the laser beam onto a target consisting of anoptical coded mask over an array of photodiodes. In still another embodiment, a voltageis applied to a pair of plates between which is a transparent media whose opticaldielectric constant changes with applied voltage. In yet another embodiment, the bar oflight is deflected off the surface of a mechanical or electrical diaphragm.
申请人：CENTER FOR INNOVATIVE TECHNOLOGY
代理机构：Mason, Fenwick & Lawrence
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