Simulation of imaging Fourier transform spectrometers using DIRSIG

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Title: Simulation of imaging Fourier transform spectrometers using DIRSIG
Author: Alain, Francois
Abstract: Imaging Fourier Transform Spectrometers are becoming popular sensors for hyperspectral re mote sensing. To evaluate sensor design artifacts and properties, it is useful to simulate their designs using a radiometrically correct ray-tracing tool. The Digital Imaging and Remote Sensing Image Generation model allows for such design and simulation of sensor properties. Two different design types are evaluated and simulated. The first one is a Michelson-type interferometer. The sensor collects the image by operating in "stare mode" The interferogram is collected over time by scanning one of the mirrors to generate the required optical path difference between the signals. The second design is a triangle-path (Sagnac) interferometer. With this design, the interferogram is collected spatially on the detector array, with one spatial dimension collected in the orthogonal coordinate (Hammer, et al., 1995). The sensor is operated in pushbroom mode to collect the other spatial dimension. Simulated images and the effects of design artifacts are presented, along with the theory al lowing their understanding. The effects of design artifacts are presented both individually and in combination with other artifacts. Results of the simulation of a full scene are shown and help indi cate where those sensors can be useful. Finally, recommendations and future improvements to this research are listed.
Record URI: http://hdl.handle.net/1850/13867
Date: 1999-01-01

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