| Popis: |
OPTRA is developing a compact, wide field standoff diffuse reflectance spectrometer for trace explosive detection from a safe standoff. This system is comprised of two key components: a Risley scanner and an infrared tunable laser based spectrometer. The Risley scanner is a mature technology, which uses a pair of matched prisms to steer a laser beam anywhere inside a cone. The compact size, low operating power, and large field of view of the Risley scanner make it the ideal solution for rapidly scanning the laser over the field. The infrared tunable laser spectrometer utilizes a low-cost quartz crystal tuning fork (QCTF) in place of a traditional infrared detector. The large Q-factor of the QCTF enables high sensitivity, low noise detection of explosive signatures even for low concentrations and large standoffs. By coupling this demonstrated technology with a mature Risley scanner design, the field can be scanned both spatially and spectrally. Pairing this data with sophisticated algorithms results in a map of explosives in the field. This paper presents OPTRA's breadboard spectrometer design along with the TNT and RDX spectra it produced. |
