SWIR Variable Dispersion Spectral Imaging Sensor
AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
Pagination or Media Count:
A novel spectral imaging sensor based on dual direct vision prisms is described. The prisms project a spectral image onto the focal plane array of an infrared camera. The prism set is rotated on the camera axis and the resulting spectral information is extracted as an image cubex, y, 1, using tomographic techniques. The sensor resolves more than 40 spectral bands channels at wavelengths between 1.2 microns and 2.5 microns wavelength. The sensor dispersion characteristic is determined by the vector sum of the dispersions of the two prisms. The number of resolved channels, and the related signal strength per channel, varies with the angle between the prism dispersion axes. This is a new capability for this class of spectral imaging sensor. Reconstructed short-wave imagery and spectral data is presented for outdoor and laboratory scenes and for standard test sources.
- Atomic and Molecular Physics and Spectroscopy
- Radiofrequency Wave Propagation