Fiber optical measuring device for measuring electrical and magnetic quantities by laterally controlled photo-luminescence
First Claim
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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Abstract
A fiber optical measuring device for measuring primarily electric voltage or magnetic field, comprises a transducer having a sensor element, the transducer being connected by means of at least one optical fiber to a measuring electronic unit provided with at least two light sources having different emission spectra for excitation of photo-luminescence in the sensor element and at least one photo-detector for detection of photo-luminescene emanating from the sensor element. The sensor element includes at least one luminescent layer arranged so that light from said optical fiber is arranged to fall towards the surface of the layer. Between the end surface of the optical fiber in the transducer and the surface of the luminescent layer, there is arranged at least one optical filter perpendicular to the ray path of the light. The luminescent layer is provided with at least two electrodes to generate, in the layer, a lateral electric field for the purpose of accelerating charge carriers which are excited by light emitted from the measuring electronic unit and transmitted to the luminescent layer via the optical fiber and through at least one of the filters.
23 Citations
18 Claims
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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 wherein
said 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, and two 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- 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 wherein
Specification