IR array absolute spectral characteristics measurement by an alternative method
Physical and technical aspects realization of infrared array’s measurement of absolute spectral characteristics (current sensitivity, voltage sensitivity and quantum efficiency) without spectral equipment (monochromator, Fourier spectrometer) is considered. The alternative method is based on measuring of array’s output signal measurements generated by successively set intensity modulated light beam from black body (BB) with different temperatures. These signals are measured against background of constant signals from dark current, background, input window, chopper disk and constant output signal of LSI multiplexer. The measurement results represent the system of Fredholm’s integral equations. Its left part is experimentally measured variable signals but right part includes mathematical expressions describing these signals. Its solution gives us absolute values of spectral components of current sensitivity, voltage sensitivity and quantum efficiency for each array’s photosensitive element (PSE). The equipment scheme and its functional features is considered and analyzed. It is also shown the extra advantages of new method over the existent methods and techniques.