Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1988-11-23
1990-10-23
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
250226, 341 13, G01B 1114
Patent
active
049647270
ABSTRACT:
An optical sensor and an optical sensing system and method in which both analog and digital techniques are employed. The sensor comprises an encoder and an illumination source. The encoder includes a plurality of tracks, and the illumination source illuminates each track with an associated optical input signal. Each input signal comprises light in a wavelength range different from the wavelength ranges of the other input signals. Each track includes means responsive to the value of a measurand for modulating the intensity of the associated input signal, in one of N different ways, to produce a corresponding modulated signal, N being greater than 2. The intensities of the modulated signals thereby encode the value of the measurand. The illumination source may also produce a reference signal that is not modulated by the measurand. The modulated and referenced signal may be combined into an output signal, and the composite input signal and output signals may be conveyed to and from the sensor via fiber-optic cables.
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patent: 4740688 (1988-04-01), Edwards
patent: 4849624 (1989-07-01), Huggins
K. Fritsch and G. Beheim, "Wavelength-Division Multiplexed Digital Optical Position Transducer," Optics Letters, 11:1-3, Jan. 1986.
Norris Lewis, "Fiber Optic Sensors Offer Advantages for Aircraft," SPIE Optical Engineering Reports, Jun. 1987.
Pham Hoa
Rosenberger Richard A.
The Boeing Company
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