Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-11-14
1987-06-09
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534, G01D 538
Patent
active
046722017
ABSTRACT:
A device for detecting alternating light and dark areas of a Vernier or Moire interference pattern. The device comprises a plurality of paired light sources and light detectors. The detector of each such pair is positioned to receive light from the corresponding source of each of such pairs. An opaque scale having transparent graduations and a grating having transparent graduations are included. The scale and grating are movable relative to each other and light from each light source is directed toward its corresponding detector through the scale and grating so that alternating light and dark areas in the form of an interference pattern are formed. The device also includes a light directing arrangement for independently allowing adjustment of the light emanating from each light source in a direction along a line passing through the light and dark areas and for allowing change of the amount of light received by the light detectors. The adjustments for phase and gain are substantially independent of each other. Certain embodiments allow the adjustment for gain to be made by moving the light directing arrangement in a direction approximately 90.degree. to the line passing through the light and dark areas. Another embodiment adjusts for the amount of light by employing a shutter effect. The light directing arrangement permits independent adjustment during calibration of the amount and relative phase of light detected by each of the light detectors. A method for adjusting gain and phase of a measuring device using Vernier or Moire interference patterns is also described.
REFERENCES:
patent: 4461083 (1984-07-01), Ernst
patent: 4533830 (1985-08-01), Beauprey
Acu-Rite Incorporated
LaRoche Eugene R.
Mis David
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