Regularized broadband filter method for spectral responsivity measurements

A regularized formulation of the broadband filter method is presented for measuring the spectral responsivity of photodetectors. Same a priori knowledge of the spectral responsivity to be measured is exploited in the framework of the standard broadband filter method. Partial information on the spectral behavior coming from theory, experience and/or catalog data allows one to overcome the ill-conditioning intrinsic to the original formulation of the problem. Simulated and experimental tests on actual photodetectors show the capabilities of this method. In particular, it acts successfully with V(λ)-corrected detectors