Closed loop Foucault knife-edge test

Details Closed loop Foucault knife-edge test Closed loop Foucault knife-edge test

1990-03-21

1991-02-19

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

G01B 900

Patent

active

049938312

ABSTRACT:
The historical Foucault knife-edge test enables one to passively ascertain an optical imaging device's characteristics, for example, whether or not it is a source of optical aberrations. The historical Foucault knife-edge test corresponds to an open loop control system, since a control action, which is that quantity responsible for producing the imaging device characteristic, or open loop output, is independent of that output. The present invention, in sharp contrast to the historical Foucault knife-edge test, discloses a method for closing the Foucault open loop, so that the control action is somehow dependent on the output. In this way, accordingly, dynamic steps can be taken to compensate for, or remove the optical aberrations.

REFERENCES:
patent: 2304814 (1942-12-01), Glasser
patent: 3418477 (1968-12-01), Knutrud et al.
patent: 3431352 (1969-03-01), Philbert
patent: 4272190 (1981-06-01), Shapiro

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