Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1975-09-24
1977-04-19
Wilbur, Maynard R.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
250211K, 250203R, 356152, 356172, G01B 1126
Patent
active
040185320
ABSTRACT:
A sun direction detection system is disclosed. It includes a housing with a slit, through which a line image of the sun is directed into the housing in a first direction. Placed in the housing is a substrate on which at least one pair of detectors are deposited in a direction perpendicular to the first direction. One of the detectors is an illumination detector consisting of two spaced apart elongated strips with a strip of cadmium sulphide (CdS) deposited therebetween. Whenever the line image impinges the CdS strip, the resistance between the two other strips is relatively low, while being high when the line image is outside the field of view of the illumination detector. Also included is a sun angle detector which consists of a vapor deposited resistor strip connected at one end to +10v and at the other end to -10v. Spaced apart from the resistor strip is an elongated strip of low resistance material acting as an output strip, with a CdS strip between the two strips. When the line image is within the field of view of the sun angle detector, the output voltage at the output strip depends on the position of the line image across the sun angle detector. When the line image is at one end, the output voltage is +10v and when the line image is at the other end, the output voltage is -10v. The field of view of the illumination detector is less than that of the sun angle detector so that the change of resistance of the illumination detector from high to low or low to high occurs when the output voltage is either +10v or -10v, depending on the position of the line image with respect to the two detectors.
REFERENCES:
patent: 3936187 (1976-02-01), Momose
patent: 3951550 (1976-04-01), Slick
Fletcher James C. Administrator of the National Aeronautics and Space
Pace, Jr. George D.
Schmidt Louis F.
Buczinski S. C.
Manning John R.
McCaul Paul F.
Mott Monte F.
Wilbur Maynard R.
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