基于紫外增强空间光调制技术的单光子计数成像探测系统OA

To meet the increasing demand for high-sensitivity,large-dynamic-range detection in space weather monitoring,ultraviolet(UV)early-warning reconnaissance,and advanced analytical instrumenta-tion,a single-photon-counting UV imaging detection system is presented.High sensitivity and low noise in the UV band are achieved by integrating an array single-photon counter with a UV-enhanced digital mi-cromirror device(DMD)featuring small pixel size and a high spatial light-modulation rate.Dynamic ad-justment of spectral sequences on a per-pixel basis is enabled,and pixel-level modulation of incident pho-tons is implemented at the array single-photon counter.When weak target spectral signals are identified,an encoding modulation strategy is applied to improve the signal-to-noise ratio(SNR)within the target imag-ing region.Based on region identification and spatial-domain correlation,multi-level irradiance control is im-posed on corresponding sensor pixels,allowing saturated regions to be rapidly driven into the optimal re-sponse range.The coupled internal optical architecture is described,and key performance metrics includ-ing wavelength range,dark count rate,and dynamic range are evaluated.Experiments demonstrate a response wavelength range of 180-320 nm,a dynamic range of 163.9 dB,a dark count rate of 0.481 cps/cm²,and a system transfer function exceeding 0.6,consistent with the design targets.The devel-oped system supports high-sensitivity UV spectral imaging with low dark counts,fine spatial resolu-tion,and high-speed spatial modulation,providing enabling technology for high-sensitivity UV imaging applications in China.