Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1984-02-27
1986-12-09
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250227, 356352, G01B 902
Patent
active
046277285
ABSTRACT:
A sensor responsive to magnetic field strength employs a feedback control loop operating on a piezoelectric stretcher element (13) to maintain a predetermined phase relationship between the optical path lengths of first and second Fabry Perot optical fiber/waveguide interferometer cavities (4, 11) optically in series. The control signal for the loop is derived from monitoring the transmission of the series combination and compensates for changes in optical path length in one of the cavities, the sensor cavity (4), induced by a magnetostrictive stretcher (7). The arrangement is responsive not only to the magnetic field but also to spurious effects resulting from temperature changes and so a reference cavity (5) thermally strapped to the sensor cavity is employed in a similar configuration to provided a second signal for correction purposes.
REFERENCES:
patent: 4360272 (1982-11-01), Schmadel et al.
Cielo, "Fiber Optic Hydrophone: Improved Strain Configuration and Environmental Noise Protection", Applied Optics, 18, No. 17, pp. 2933-2937, 9/79.
Koo et al., "Characteristics of Fiber-Optic Magnetic-Field Sensors Employing Metallic Glasses", Optics Letters, 7, No. 7, pp. 334-346, 7/82.
Christopher J. S.
International Standard Electric Corporation
Koren Matthew W.
Peterson T. L.
Willis Davis L.
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