Passive remote sensor of chemicals

Optics: measuring and testing – For light transmission or absorption – Of fluent material

Reexamination Certificate

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C356S438000

Reexamination Certificate

active

06853452

ABSTRACT:
A remote sensor for use as a handheld, mobile or stand-alone sensor has first (12) and second (16) optical paths, light collecting optics, a sample filter (10) assembly positioned in a first optical Path (12), a reference filter (14) assembly positioned in a second optical path (16), a detector assembly to detect the filtered light r other radiation, and a detector output comparison device such as BRD to minimize the effects of common background noise components, differences in light or other radiation source power, and absorption or emission by interfering species.

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