System to determine environmental pressure and birefringent-bias

Details System to determine environmental pressure and birefringent-bias System to determine environmental pressure and birefringent-bias

1995-03-17

1996-12-31

Rosenberger, Richard A.

Optics: measuring and testing

Material strain analysis

With polarized light

356364, 73800, G01B 1116

Patent

active

055899315

ABSTRACT:
A cladded birefringent pressure sensor for use in a pressure-sensing system. The sensor is a single composite plate consisting of two plates each with different indices of refraction. One surface of the sensor is exposed to the environmental pressure under measurement. A collimated broad band light source is transmitted via a fiber optic cable, a polarizer and a birefringent bias element which transmits a wavelength/polarization component of light through the sensor. An external force applied to the sensor adds a stress-induced component to the polarized lightwave. The lightwave exits the sensor and is captured by a second polarizer producing a modulated light spectrum. A focusing element collects the light and transmits it down another fiber optic cable. The cable transmits the light to an opto-electronic interface where the fringe pattern is extracted and a computer compatible signal is generated for a CPU. The CPU performs a Fourier transform on the fringe pattern, where the phase term for a selected frequency is the measure of the externally applied pressure on the sensor.

REFERENCES:
patent: 4466295 (1984-08-01), Wesson
patent: 4757195 (1988-07-01), Katagiri et al.
patent: 5255068 (1993-10-01), Emo et al.

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