Modular imaging spectrometer instrument (MISI) calibration using blackbody radiators

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Title: Modular imaging spectrometer instrument (MISI) calibration using blackbody radiators
Author: Ientilucci, Emmett
Abstract: In Remote Sensing, absolute calibration of airborne image acquisition systems is essential. The MISI (Modular Imaging Spectrometer Instrument), developed at RIT’s Digital Imaging and Remote Sensin Laboratory (DIRS), is one such devise that needs this calibration. Without this calibration, visible and radiometric data collected by the MISI can be difficult to interpret. RIT has previously developed a line scanner but its means of calibration did not take into account the detector gain and bias of the system scanners, in general, that operate in the thermal regions of the EM spectrum use blackbody radiators for their means of calibration. The detectors on these instruments are subject to low frequency drift due to temperature changes, pre amplifier noise, and effects due to detector vacuum loss. This drift can be corrected by using two blackbody radiators placed within the MISI. This research focused on the construction, regulation, and implementation of such a radiation source. For this research one radiation source was constructed. The uniformity of the source had an average temperat variation of 0.5°C, when fully insulated. A feedback control system was designed to regulate and mo blackbody. A software controlled algorithm, used to control the radiation source, was also designed and control the source to ±0.15°C. Temperature knowledge of the radiation source was believed to be about 0.2°C.
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Date: 1998-05-20

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