Method and device for the measurement of force by a fiber optics

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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25022719, 73800, H01J 516

Patent

active

053089731

ABSTRACT:
A method and the device for fiber-optic measurement of the absolute value of the pretensioning in a highly loaded mechanical structural component part are based on the measurement of the phase displacement of a light wave caused by the strain-induced birefringence in a single-mode light waveguide 4 which is embedded between two metallic disks or washers 3a, 3b. Since the measurement results are ambiguous modulo-2.pi., serial or simultaneous measurement with two light wavelengths .lambda..sub.1, .lambda..sub.2 is used according to a first method variant of the invention. The quantity of 2.pi. periods can be unequivocally determined within a predetermined measuring range by means of comparing the two measurement results. The evaluation is preferably effected according to a quadrature or phase step method, known per se. According to second method variant, the light waveguide 4 is irradiated with polarized white light. The phase difference of the two linear modes due to the influence of force on the structural component part is compensated for in a compensation device 20. The control signal required for the compensation of the path difference is evaluated as a measurement for the force. The compensation method has the advantage that no monochromatic light sources are required.

REFERENCES:
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patent: 4880970 (1989-11-01), Jones
patent: 4884434 (1989-12-01), Satake et al.
patent: 4904050 (1990-02-01), Dunn et al.
patent: 4904863 (1990-02-01), McDearmon
patent: 5061847 (1991-10-01), Hazan et al.
patent: 5072113 (1991-12-01), Martinelli et al.

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