Design and Experiments of Photon Counting Imaging Test Platform

The photon counting avalanche photodiode (APD) imaging test platform is put up according to the semi-classical theory of photoelectric detection which the classical statistical fluctuation of the light field is combined with the fluctuation of the interaction between light and matter. A mathematical model between APD photon counting frequency´s expectation and input gray levels is set up. With changes of scene gray, the photon number of reflective radiation is bigger; photon counting frequency expectation of the corresponding sampling points will be greater. A black white stripe image is scanned at 10^-3lx low light level (LLL) illumination. In accordance with the established mathematical model and the scanning mechanism, the photon counting output appearing as one-dimensional time-domain will be represented as two-dimensional image information.