US PATENT SUBCLASS 374 / 125
.~.~.~ With fluid flow purging device

Current as of: June, 1999
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374 /   HD   THERMAL MEASURING AND TESTING

100  DF  TEMPERATURE MEASUREMENT (E.G., THERMOMETER) {13}
120  DF  .~ In spaced noncontact relationship to specimen {3}
121  DF  .~.~ By thermally emitted radiation {11}
125.~.~.~ With fluid flow purging device

DEFINITION

Classification: 374/125

With fluid flow purging device:

(under subclass 121) Subject matter having an arrangement to produce a stream of fluid flowing past at least one element of a radiation analyzing arrangement in order to remove from the element, or the path between the element and the emitting object, particulate or other undesired material.

(1) Note. The element is often an optical element (e.g., lens or window).

(2) Note. The fluid stream usually has an incidental cooling effect.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

509, for fluid stream particle control for optical elements, in general.