THE THERMAL HYPERSPECTRAL IMAGER: AN INSTRUMENT FOR REMOTE SENSING OF EARTH'S SURFACE, ATMOSPHERE, AND OCEAN, FROM A MICROSATELLITE PLATFORM

摘要

The Thermal Hyperspectral Imager (THI) is a low cost, low mass, power efficient instrument designed to acquirehyperspectral remote sensing data in the long-wave infrared. The instrument has been designed to satisfy mass,volume, and power constraints necessary to allow for its accommodation in a 95 kg micro-satellite bus, designed bystaff and students at the University of Hawai?i. THI acquires approximately 30 separate spectral bands in the 8 to 14?m wavelength region, at 10 wavenumber resolution. Rather than using filtering or dispersion to generate thespectral information, THI uses an interferometric technique. Light from the scene is focused onto an uncooledmicrobolometer detector array through a stationary interferometer, causing the light incident at each detector at anyinstant in time to be phase shifted by an optical path difference which varies linearly across the array in the alongtrackdimension. As platform motion translates the detector array in the along-track direction at a rate ofapproximately one pixel per frame (the camera acquires data at 30 Hz) the radiance from each scene element can besampled at each OPD, thus generating an interferogram. Spectral radiance as a function of wavelength issubsequently obtained for each scene element using standard Fourier transform techniques. Housed in a pressurevessel to shield COTS parts from the space environment, the total instrument has a mass of 15 kg. Peak powerconsumption, largely associated with the calibration procedure, is <90 W. From a nominal altitude of 550 km theresulting data would have a spatial resolution of approximately 300 m. Although an individual imaging event yieldsapproximately 1 Gbit of raw uncompressed data, onboard processing (to convert the interferograms into aconventional spectral hypercube) can reduce this to tens of Mbits per scene. In this presentation we will describe a)the rationale for the project, b) the instrument design, and c) how the data are processed. Finally we will present dataacquired by THI on a laboratory microscope stage to demonstrate the spectro-radiometric quality of the data that theinstrument can provide.