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Fiber optical measuring device for measuring electrical and magnetic quantities by laterally controlled photo-luminescence

  • US 4,514,860 A
  • Filed: 05/31/1983
  • Issued: 04/30/1985
  • Est. Priority Date: 06/02/1982
  • Status: Expired due to Fees
First Claim
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1. In a fiber optical measuring device which includes a transducer having a sensor element;

  • a measuring electronic unit having two light-emitting means and a photodetector means, the first of said light-emitting means being capable of emitting a light ray having an emission spectra which is different from that of the second of said light-emitting means, and said photodetector means being capable of detecting photoluminescence emanating from said sensor element, and an optical fiber means which extends from said measuring electronic unit into said transducer so as to convey light rays from said two light-emitting means to said sensor element and to convey photoluminescence emitted from said sensor element to said photodetector means, the improvement whereinsaid sensor element includes a luminescent layer which has a front surface and a rear surface, said optical fiber means having an end within said transducer which is directed towards the front surface of said luminescent layer,an optical filter means is positioned between said end of said optical fiber means and the front surface of said luminescent layer, said optical filter means being oriented so as to be substantially perpendicular to the light rays passing out of said end of said optical fiber means, and having a plurality of zones of different light transmission characteristics, andtwo electrodes are connected to said luminescent layer so as to generate a lateral electric field within said luminescent layer and cause charge carriers which have been generated in one portion of said luminescent layer by the light rays passing through said optical filter means and onto the front surface of said luminescent layer to accelerate to another portion of said luminescent layer, the photoluminescence produced by said relocated charge carriers being received by said photodetector.

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