Infrared Imaging Spectroradiometer

Physical Sciences will develop an imaging infrared spectroradiometer based on the use of single order Fabry-Perot interferometry. An IR focal plane array views the center of the interference pattern, which contains the image of the object at the transmission wavelength. Piezoelectric transducers, synchronized with the framing rate of the array, move the interferometer mirrors to change the transmission wavelength. This capability allows for rapid and adaptive changes in sensor bandpass and wavelength selection. Full spectral coverage from 1.35 um to the LWIR is provided at a possbile spectral resolution of 2% of the transmission wavelength. The concept offers spectral resolution and sensivity comparable to IR circular variable filter based systems, with the advantages of great mechanical simplicity and ruggedness, a common optical train and pixel registration at all wavelengths, higher spectral fidelity, and high framing rates.