Fiber-optical measuring apparatus
First Claim
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1. Measuring apparatus, comprising:
- a magneto-optical modulator-type transducer with a domain-producing magnetic material influenced by the characteristic being measured, and including at least one optical filter having a transmission characteristic including that of said transducer, and at least one other optical filter having a transmission characteristic outside that of said transducer;
at least three radiation sources each having different non-overlapping emission spectra for irradiating said transducer, the emission spectra of a first radiation source being absorbed by said transducer to a greater extent than the radiation from the other of said at least three radiation sources, the radiation from another of said at least three radiation sources being reflected by said transducer, said transducer modulating the radiation from one of said another of said at least three radiation sources to a greater extent than the modulation of the radiation from the remaining of said at least three radiation sources;
an opto-electronic measuring unit for sensing the radiation emanating from said transducer of said at least three radiation sources and including means for calculating the amount of magneto-optical modulation of said transducer with compensation for varying attenuation and reflection within the measuring apparatus; and
fiber optical means for transmitting the radiation from said at least three radiation sources to said transducer and for transmitting the radiation emanating from said transducer to said opto-electronic measuring unit.
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Abstract
A fiber-optical measuring apparatus for measuring magnetic fields, current, position, and various mechanical quantities consists of a transducer connected to a measuring electronic unit via at least one optical fiber, and the transducer comprises a magneto-optical modulator with a domain-producing magnetic material. The transducer is provided with at least two optical filters, of which at least one filter is positioned in the ray path on one side of the magneto-optical modulator and at least one other filter is positioned in the ray path on the opposite side of the modulator.
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Citations
18 Claims
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1. Measuring apparatus, comprising:
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a magneto-optical modulator-type transducer with a domain-producing magnetic material influenced by the characteristic being measured, and including at least one optical filter having a transmission characteristic including that of said transducer, and at least one other optical filter having a transmission characteristic outside that of said transducer; at least three radiation sources each having different non-overlapping emission spectra for irradiating said transducer, the emission spectra of a first radiation source being absorbed by said transducer to a greater extent than the radiation from the other of said at least three radiation sources, the radiation from another of said at least three radiation sources being reflected by said transducer, said transducer modulating the radiation from one of said another of said at least three radiation sources to a greater extent than the modulation of the radiation from the remaining of said at least three radiation sources; an opto-electronic measuring unit for sensing the radiation emanating from said transducer of said at least three radiation sources and including means for calculating the amount of magneto-optical modulation of said transducer with compensation for varying attenuation and reflection within the measuring apparatus; and fiber optical means for transmitting the radiation from said at least three radiation sources to said transducer and for transmitting the radiation emanating from said transducer to said opto-electronic measuring unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification