Chamber Optics for Testing Passive Remote Sensing Vapor Detectors
Final rept. Jan-Jun 1993
EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
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There is a need to test the response of multiple remote sensing FTS to known concentrations of vapors with a carefully controlled temperature difference, delta T, between a background source, Tbg, and the gas, Tg. We have analyzed the various factors inherent in delivering a beam of specified radiance to the sensor including the geometrical factors needed to assure that the background source fills the field-of-view, methods of multisensor viewing and the effects of the transmittance of the additional optical elements. Several optical configurations will deliver a suitable beam. The telescopically based system delivers a spatially similar beam to what the sensor would see in the field. The 2 lens system delivers an image at the entrance aperture that is functionally equivalent to a collimated beam at least for single detector spectroradiometers. The radiance analysis showed that the position of the optical elements is important. These results suggest that there is very little penalty to a one window cell, which might be substantially easier to design and build than a windowless cell. This effort has been completely analytical experimental verification is planned for the coming year. Infrared, Spectroradiometry, Etendue, Radiance, Geometrical optics, Telescope.
- Physical Chemistry
- Optical Detection and Detectors