Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-03-17
1991-03-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022723, 250237G, G01J 350
Patent
active
049994891
ABSTRACT:
An optical WDM sensor and sensing system for determining a value of a measurand, such as an encoder position. An optical source produces a composite input signal that includes a plurality of different wavelength component signals. The sensor includes an encoder and a concave diffraction grating. The encoder has a plurality of tracks, each track being responsive to the value of the measurand for modulating the intensity of light incident thereon to produce a modulated signal. The grating demultiplexes the composite input signal to produce separate component signals that are directed to an incident upon the respective tracks. Each track produces a modulated signal, and the modulated signals are multiplexed, preferably by the grating, to produce a return signal that may be demultplexed and detected to determine the measurand value. Preferably, the sensor comprises a planar optical waveguide having the grating formed on one side surface. The encoder may be positioned adjacent to the waveguide, or coupled to the waveguide via optical fibers.
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Allen Stephone B.
Nelms David C.
The Boeing Company
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