Wavefront sensor employing a modulation reticle

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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250216, G01U 120

Patent

active

044383304

ABSTRACT:
An incremental slope wavefront sensor having an optical system which focuses an incident wavefront to a focal point. A novel modulation reticle is positioned at the focal point, and is driven in linear oscillation along a single axis. The modulation reticle has a modulation pattern formed thereon by alternating triangular light transmissive areas and inverted triangular light reflective areas. A first detector array detects the wavefront which has passed through the transmissive areas and diverged from the focal point in a two dimensional array of zones. A second detector array detects the wavefront which has been reflected by the reflective areas and diverged from the focal point in a two dimensional array of zones. The output signals from the first and second detector arrays for each corresponding zone are differentially combined to form a differential output signal for each zone. The y position of detected radiation in each zone of the wavefront is obtained by multiplying its differential output signal by a weighting function proportional to the instantaneous velocity of the reticle. The x position of detected radiation in each zone is obtained by multiplying its differential output signal by a weighting function proportional to the instantaneous velocity of the reticle and by a square wave function having respectively positive and negative values when the displacement of the reticle along the single axis is respectively positive and negative with respect to a coordinate system defined by the modulation pattern.

REFERENCES:
patent: 3586665 (1971-06-01), Weyrauch
patent: 3832066 (1974-08-01), Cornsweet
patent: 3923400 (1975-12-01), Hardy
patent: 4091274 (1978-05-01), Angelbeck et al.
patent: 4271355 (1981-06-01), Wisner et al.
patent: 4393303 (1983-07-01), Spinhirne

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