Patent
Sun direction detection system
TLDR
In this article, a sun direction detection system is disclosed, consisting of two spaced apart elongated strips with a strip of cadmium sulphide (CdS) deposited there between.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.read more
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References
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Patent
Direction-sensing virtual aperture radiation detector
TL;DR: In this paper, a plurality of sensors can determine the location of the radiation source through the intersection of the directions determined by the respective sensors, in addition, the detected radiation sources coupled to an object can locate a direction of a radiation source relative to the object.
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