中国科学院南京天文光学技术研究所机构知识库

The wavefront sensor(WFS),equipped with an electron-multiplying charge coupled device(EMCCD)detector,is a critical component of the Cool Planets Imaging Coronagraph(CPI-C)on the Chinese Space Station Survey Telescope(CSST).Precise cali bration of the WFS’s EMCCD detector is essential to meet the stringent requirements for high-contrast exoplanet imaging.This study comprehensively characterizes key perfor mance parameters of the detector to ensure its suitability for astronomical observations. Through a multi-stage screening protocol,we identified an EMCCD chip exhibiting high resolution and low noise.The electron-multiplying gain(EM Gain)of the EMCCD was analyzed to determine its impact on signal amplification and noise characteristics,identi fying the optimal operational range.Additionally,noise properties such as readout noise were investigated.Experimental results demonstrate that the optimized detector meets CPI-C’s initial application requirements,achieving high resolution and low noise.This study provides theoretical and experimental foundations for the use of EMCCD-based WFS in adaptive optics and astronomical observations,ensuring their reliability for advanced space-based imaging applications.