Hughes Aircraft Company

Michael J Slattery

Wilfried Krone-Schmidt

Werner V Brandt

Edward S Di Milia

Howard S Bowen

John D Sneed

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/no-go indicator for providing an indication of CO.sub.2 snow production.

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

An improved apparatus and method adapted for use in removing trace contaminants from the surface of a chosen substrate, such as delicate surfaces or precision parts, by application of a stream or jet spray of expanded fluid to the substrate surface. The improvement consists of controlling electrostatic charges generated on or near the substrate surface during the cleaning process.

Electrostatic discharge control during jet spray

An improved apparatus and method for removing trace contaminants from the surface of a chosen substrate, such as delicate surfaces or precision parts, wherein the improvement consists of heating a portion of a chosen substrate surface immediately before, during and/or after application of a stream of cleaning snow to the same portion of the substrate surface.

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Gardena, CA, United States of America

Michael J Slattery