Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1982-01-28
1984-04-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250237R, G01J 120
Patent
active
044410190
ABSTRACT:
A relatively simple wavefront sensor is constructed with an astigmatic optical system which focuses an indicent wavefront to x and y focal planes, with the x and y focal planes being relatively displaced along the optical axis because of the astigmatic nature of the optical system. An x modulation reticle is positioned at the x focal plane, and an x drive tuning fork drives the x modulation reticle in linear oscillation at a frequency f.sub.x to modulate the wavefront thereat. A y modulation reticle is positioned at the y focal plane, and a y drive tuning fork drives the y modulation reticle in oscillation, substantially perpendicular to the direction of oscillation of the x modulation reticle, at a frequency f.sub.y, different from the frequency f.sub.x, to also modulate the wavefront thereat. A detector array then receives the modulated wavefront, with each detector in the array receiving and detecting a different zone of the incident wavefront. An x electrical filter is coupled to the output of each detector, tuned to the frequency f.sub.x, to filter out the modulated signal derived from modulation by the x modulation reticle, and a y electrical filter is also coupled to the output of each detector, tuned to the frequency f.sub.y, to filter out the modulated signal derived from modulation by said y modulation reticle. The arrangement is such that the time relationships between the signals produced by the detectors in the array ar representative of the slopes of different portions of the wavefront.
REFERENCES:
patent: 3586665 (1971-06-01), Weyrauch
patent: 3832066 (1974-08-01), Cornsweet
patent: 3923400 (1975-12-01), Hardy
patent: 4079247 (1978-03-01), Bricot et al.
patent: 4091274 (1978-05-01), Angelbeck et al.
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
Nathans Robert L.
Nelms David C.
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