A design of the size of the echo spot on the quadrant detector, a key technical problem in autotracking technology, is presented. The relationships between spot size and the size and shape of the field of view of tracking are determined. It is pointed out that the size of the tracking region in the field of view should be ±(d/2), and its shape should be a square when the diameter of the spot is assumed to be d. The mutual relation between the spot size and the tracking sensitivity as well as angular tracking error is discussed.

© 1984 Optical Society of America

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