Abstract
The performance of focal plane arrays of cadmium mercury telluride (HgCdTe) photodetectors when used in the 8 to 12 um spectral range is limited by the nonuniformity of the responses of the detector elements in the array. If arrays of large numbers of detectors are to be used as sensors to achieve small noise equivalent temperature differentials (NETDs), these nonuniformities will have to be reduced during the fabrication of the arrays or compensated for in operation by correcting the output obtained from each individual detector. This paper analyzes some of the requirements for compensation techniques and discusses their application to infrared focal plane detector arrays. A method of compensation is proposed that provides significantly better correction than linear two-point correction schemes. The performance of the method is analyzed, and its application is demonstrated using a HgCdTe focal plane detector array.
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