Correction of Gain and Optical Throughput Variations in a Two-Dimensional Imaging Spectrometer

摘要

Whenever an imaging spectrometer is employed, pixel to pixel variations and changes in sensitivity, gain, or noise can distort a recorded image. As a result, some form of normalization is required if faithful images are to be recorded. Although a number of alternative approaches have been explored for such normalization, the method described in this paper is novel in its effectiveness and simplicity. In this approach, a chemiluminescence substance is introduced into a flat sample cell whose dimensions are large enough to ensure uniform coverage of the photodetector array of interest. Because the chemiluminescence solution is homogeneous, it can be used to uniformly irradiate the imaging detector; recording of the resulting image then indicates any variations that exist across the detector face. In turn, the array of data so produced serves nicely as a normalization vehicle for later images to be taken. Image processing, Tomography, Solid state detector arrays, Atomic spectrometry. (mjm)