Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1997-10-09
2000-02-08
Lee, John R
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356121, G01J 120
Patent
active
060230576
ABSTRACT:
A device for determining the phase errors of electromagnetic waves (OE) which are generated by a light source and transmitted by an optical instrument includes a reception system (SM) having at least one measurement plane (PM, PM3, PM4) provided with a plurality of measurement zones (ZM) which can measure the intensity of the received light and a collimation means (L1) for sending to the measurement plane (PM, PM3, PM4) the electromagnetic waves (OE) transmitted by the optical instrument. The device also includes a defocusing system (SD1, SD2) which can send at least one pair of associated planes (P1, P2), which are conjugate with the pupil plane of the optical instrument, to the reception system (SM) for them to be measured, a computation unit (UC) which determines the phase errors on the basis of measurements taken by the reception system (SM) on the associated planes (P1, P2), and a spatial filter (F) which is arranged in the image plane (P1) of the optical instrument, with the spatial filter restricting the area of the light source seen by the reception system (SM) while allowing the spatial spectrum of the phase errors to be transmitted.
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French Search Report dated Jul. 25, 1997, two pages.
Gaffard Jean-Paul
Gosselin Patrick
Compagnie Industrielle des Lasers Cilas
Lee John R
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