Optical focussing sensor

Details Optical focussing sensor Optical focussing sensor

1976-09-24

1978-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

040792480

ABSTRACT:
The invention relates to focussing sensors for measuring the deviation between the point of convergence of a beam of radiant energy and the surface of an object receiving this beam. According to the invention, a degree of asymmetry is first introduced into this beam, after which the image of this convergence point if formed on photoelectric sensors enabling the distortions of this image to be measured. These sensors supply signals which are dependent upon said deviation and enable it to be measured.

REFERENCES:
patent: 3418477 (1968-12-01), Knutrud et al.
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3904870 (1975-09-01), Stauffer
patent: 3992575 (1976-11-01), Velzel et al.

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