Resonant piezoelectric chopper for infrared radiation

Details Resonant piezoelectric chopper for infrared radiation Resonant piezoelectric chopper for infrared radiation

1988-03-16

1989-07-25

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

250339, 250351, 350315, 350318, G01J 351

Patent

active

048506974

ABSTRACT:
Apparatus for inserting and removing several filters from an optical path and for determining at all times the instantaneous positional relationship of each filter with respect to the optical path includes a set of filters mounted on a carrier which is attached to a resonant piezoelectric system, and further includes reference tracks also located on the carrier and extending in the direction of the oscillatory motion and including a sequence of binary indicia progressing in the direction of the oscillatory motion. The reference tracks are read optically to produce a series of binary electrical signals which are processed to yield the instantaneous position of the carrier and filters with respect to a fixed optical path.

REFERENCES:
patent: 4485305 (1984-11-01), Kuwano et al.
patent: 4599001 (1986-07-01), Richard
patent: 4631406 (1986-12-01), Nakata

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