Importance

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Abstract

A detector for measuring the reflectivity of a pollution reduction coating, including a housing, a substantially transparent window formed in the housing, a light source operationally connected in the housing and adapted to shine out the window onto the coating and a photodetector assembly operationally connected in the housing. The photodetector assembly includes a first photodetector positioned to receive light from the light source reflected by the coating, a second photodetector positioned to receive light from the light source reflected only from the window, and a third photodetector positioned to receive light directly from the light source. The first and second photodetectors are substantially blocked from receiving light directly from the light source and the second photodetector is substantially blocked from receiving light from the light source reflected by the coating. The third photodetector is substantially blocked from receiving light from the light source reflected by either the window or by the coating.

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First Claim