Optical slit control apparatus

Details Optical slit control apparatus Optical slit control apparatus

1976-11-23

1978-04-04

Evans, F. L.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

350271, G01J 304

Patent

active

040824616

ABSTRACT:
Apparatus for controlling the width of an adjustable slit in response to the product of two variable functions, one of which is programmed, which includes at least one adjustable optical slit; slit width programming apparatus for producing a first displacement that is a logarithmic function of the instantaneous slit width conforming to a predetermined program; antilogarithm generating elements for producing a second displacement that is the antilogarithm of the first displacement; a phase adjusting mechanism for controlling the phasing between the first displacement and the second displacement; slit width selection apparatus operative on the phase adjusting mechanism for controlling the phasing in accordance with a given slit width selection; and actuating elements responsive to the second displacement and operative on the optical slit for controlling its width.

REFERENCES:
patent: 2587451 (1952-02-01), Farrand
patent: 3160697 (1964-12-01), Jacobs et al.
patent: 3462227 (1969-08-01), Tipotsch
patent: 3489496 (1970-01-01), Hashizume

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