Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-05-11
1989-10-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231SE, 250226, 35016217, H01J 314
Patent
active
048749419
ABSTRACT:
A transducer system that uses diffracted light energy in a transducer application analyzes light diffracted from a diffraction grating to provide an indication of displacement or other measurable environmental changes, such a temperature changes. In one form of the invention, a diffraction grating is fabricated from first and second gratings and has a step-wise change in the grating period at an inter-grating boundary. The grating is illuminated with broadband light that is diffracted as a function of the irradiated position on the grating with the wavelength of the diffracted light and the change in wavelength being a function of the diffraction grating position. In another form of the present invention, a diffraction grating is provided with a variable grating period that can vary linearly, exponentially, or in accordance with some other function with the wavelength of the diffracted light being a function of the relative displacement of the grating. Additionally, grating can be combined to provide a transducer that provides an output that can be compensated for temperature variations.
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Lovercheck Dale R.
Nelms David C.
Simmonds Precision Products Inc.
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