Optical sensing apparatus for CO.sub.2 jet spray devices

Details Optical sensing apparatus for CO.sub.2 jet spray devices Optical sensing apparatus for CO.sub.2 jet spray devices

1995-03-13

1996-10-01

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

356436, 356437, 451 6, 451 39, G01N 2159, B24B 4912

Patent

active

055615279

ABSTRACT:
Optical sensing apparatus for use with a CO.sub.2 jet spray nozzle that sprays a plume. The apparatus comprises a coherent light source that provides a light beam. A photodiode is disposed such that it detects the light beam emitted by the coherent light source that passes through the plume sprayed by the CO.sub.2 jet spray nozzle. A bandpass filter is disposed between the photodiode and the coherent light source that only passes light produced by the coherent light source. A controller coupled to the coherent light source and the photodiode that comprises a power supply for providing power to the coherent light source and the photodiode. The controller includes a digital voltmeter coupled to the photodiode for displaying a voltage output signal corresponding to the amount of light energy detected by the photodiode, and a go
o-go indicator for providing an indication of CO.sub.2 snow production.

REFERENCES:
patent: 4541272 (1985-09-01), Bause
patent: 4873855 (1989-10-01), Thompson
patent: 5405283 (1995-04-01), Goenka

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