Heterodyne circular photodetector array in a tracking system

Details Heterodyne circular photodetector array in a tracking system Heterodyne circular photodetector array in a tracking system

1990-09-10

1992-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502086, G01J 120

Patent

active

051130653

ABSTRACT:
A heterodyne photodetector array, whereby a source beam 32 is reflected off of an object 34 forming a return beam 36 is directed onto an array 48. The array has a centered photodetector cell 52 (FIG. 2) which is surrounded by a plurality of outer photodetector cells 50. The outer cells provide one or more signals for angular tracking of the object, while the center cell provides a signal which may be employed in vibration sensing or other signature measurement applications.

REFERENCES:
patent: 4123651 (1978-10-01), Mongeon
patent: 4713533 (1987-12-01), Bremer et al.
patent: 4790651 (1988-12-01), Brown et al.
patent: 4816665 (1989-03-01), Hsu
patent: 4843603 (1989-06-01), Prikryl

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