Carbon dioxide liquid and gas sensor apparatus for use with jet

Details Carbon dioxide liquid and gas sensor apparatus for use with jet Carbon dioxide liquid and gas sensor apparatus for use with jet

1997-05-02

1998-09-08

Glick, Edward J.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356128, G01N 2141

Patent

active

058048260

ABSTRACT:
Detection apparatus for use with a carbon dioxide jet spray cleaning system that determines whether liquid carbon dioxide is flowing between a storage tank and a jet spray nozzle. The detection apparatus determines whether carbon dioxide snow is generated by the jet spray nozzle, which is produced by expansion of liquid carbon dioxide through the jet spray nozzle. The apparatus comprises a transfer tube coupled between the storage tank and the jet spray nozzle that has transparent input and output windows and which permits liquid carbon dioxide to flow from the storage tank to the jet spray nozzle. A light source produces light that is focused on a pinhole in an aperture stop. A collimating lens images collimated light on the input window of the transfer tube, and a light detector detects light that is refracted by liquid carbon dioxide in the transfer tube that exits through the output window and is incident thereon, and generates an output signal indicating light detection. The output signal indicates that liquid carbon dioxide is flowing between the storage tank and the jet spray nozzle, and thus that snow is generated.

REFERENCES:
patent: 5452076 (1995-09-01), Schopper et al.

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