Apparatus and method for adjusting focus of a multi-element opti

Details Apparatus and method for adjusting focus of a multi-element opti Apparatus and method for adjusting focus of a multi-element opti

1987-12-30

1989-03-07

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250201, 356331, G01J 302, G01J 336

Patent

active

048100919

ABSTRACT:
A multi-element optical detector having a planar array of detector elements is focused at the focal plane of an optical spectrometer by placing the detector with the detecting surface of the array facing the optical spectrometer and being substantially perpendicular to the axis of the path of the light from the optical spectra to the focal plane. Relative movement is provided between the detector and the focal plane along said axis so that the detector array is placed at several different positions with respect to the focal plane. At each position the output values of the detector elements of the array are measured and the second difference of the output values is determined by the equation (-F1+2.times.F2-F3), where F1, F2, and F3 are the output values of three of the elements. The optical detector is placed at the position which provides the maximum value of the second difference, which is the position of the focal plane.

REFERENCES:
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patent: 3938894 (1976-02-01), Nanba
patent: 3973849 (1976-08-01), Jackson et al.
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4435079 (1984-03-01), Hennick

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