Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-06-12
1987-06-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356354, 356121, G01J 110
Patent
active
046706461
ABSTRACT:
A wavefront, such as from a laser, is sampled, preferably at a beam splitter to break off only a fraction of the total light energy. The sampled beam is adjusted and sized--either by expansion or contraction at a conventional telescope--and thereafter sent through paired crossed Ronchi gratings and onto a CCD camera located at the first wave distance of constructive interference from the crossed Ronchi gratings. The crossed Ronchi gratings--in the order of 200 lines per inch and preferably with 200 equally spaced gaps per inch--project an array of square spots onto the focus of the CCD camera. The image of the array of square spots at the CCD camera is frozen via a frame grabber and digitized in a conventional format. The digitized image is played through a disclosed computer program to locate the spots. Thereafter, the located spots are compared to a standard spots. By knowing the difference between spot location of the standard spots and spot location of the suspect spots, wavefront analysis in phase can be analyzed. There results a simple wavefront analysis without the use of precision and moving optical parts which provides for measurement of the wavefront.
REFERENCES:
patent: 4231662 (1980-11-01), Feirland et al.
patent: 4273446 (1981-06-01), Pohle
patent: 4309602 (1982-01-01), Gonsalves et al.
patent: 4413909 (1983-11-01), Pohle
Nelms David C.
Western Research Corporation
Wieland Charles
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