Fiber-optic voltage sensor with cladded fiber and evanescent wav

Details Fiber-optic voltage sensor with cladded fiber and evanescent wav Fiber-optic voltage sensor with cladded fiber and evanescent wav

1990-07-12

1992-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324 96, H01J 516

Patent

active

051719819

ABSTRACT:
A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities.

REFERENCES:
patent: 4376248 (1983-03-01), Giallorenzi et al.
patent: 4516021 (1985-05-01), Taylor
patent: 4524322 (1985-06-01), Bobb
patent: 4547729 (1985-10-01), Adolfsson et al.
patent: 4603296 (1986-07-01), Koo et al.
patent: 4622460 (1986-11-01), Failes et al.
M. Corke et al., "All Single Mode Fiber Magnetic Field Sensor", SPIE, vol. 566, Fiber Optic and Laser Sensors III, 1985, pp. 294-299.
S. Watanabe et al., "An Overview of Mach-Zehnder Interferometric Sensors", SPIE, vol. 566, Fiber Optic and Laser Sensors III, 1985, pp. 16-21.

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