Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-12-11
1990-05-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 250211K, 350314, 356373, 356 375, G01D 534
Patent
active
049280082
ABSTRACT:
A light transmission filter for transmitting a beam of light of any wave length. The filter is made up of a pattern of opaque figures positioned along a transparent substrate. The spacing between figures is varied along the substrate so that the beam of light intercepted by the filter is variably transmitted as a selected function of the longitudinal position of the filter relative to the beam of light. The spacing of the figures along the substrate is selected to achieve a light transmission characteristic for the film in accordance with a desired mathematical function. An optical analog position sensor for sensing the position of a movable member along a prescribed path including the optical transmission filter attached to the movable member with the substrate having a longitudinal configuration corresponding to the prescribed path. The intensity of a fixed beam of light transmitted through the filter indicates the position of the member.
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Deventer Bruce Van
Huggins Raymond W.
Miller Glen E.
Nelms David C.
The Boeing Company
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