Correlation spectrometer
| DWPI Title: Correlation spectrometer for measuring concentration of target compound in sample, has reflective mask wheel comprising region of chemical species-specific Eigen masks to provide spectral filtering of sample spectrum light |
| Abstract: A correlation spectrometer can detect a large number of gaseous compounds, or chemical species, with a species-specific mask wheel. In this mode, the spectrometer is optimized for the direct measurement of individual target compounds. Additionally, the spectrometer can measure the transmission spectrum from a given sample of gas. In this mode, infrared light is passed through a gas sample and the infrared transmission signature of the gasses present is recorded and measured using Hadamard encoding techniques. The spectrometer can detect the transmission or emission spectra in any system where multiple species are present in a generally known volume. |
| Use: Correlation spectrometer for measuring concentration of target compound in sample. Can also be used in detecting combusted gases e.g. carbon dioxide, carbon monoxide, methane and ethane, and water found in primary or secondary flue of gas furnaces, in clean room environments, exhaust testing stations e.g. cars, buildings, and stand-off detection applications. |
| Advantage: The multi-channel photodetector with integral species-specific masks eliminates the need for the mask wheel of the mask wheel correlation spectrometers. Thus, the fabrication of the species-specific masks onto the detector can be made easy and the correlation spectrometer can be miniaturized. |
| Novelty: A sample spectrum light (14) is collimated by a parabolic mirror (34) through an entrance aperture (33) and reflected onto a diffraction grating (35) where light is spectrally dispersed. A reflective mask wheel (38) is comprised of chemical species-specific Eigen masks that provide spectral filtering of the spectrum light. The spectrally dispersed light is focused onto the mask wheel by a telecentric lens (37) to spatially separate the filtered sample from the incident spectrum light beam and the filtered sample is recorded by a broadband photodetector (43). |
| Filed: 11/6/2006 |
| Application Number: US2006593386A |
| Tech ID: SD 10165.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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