基于门控积分的光电导探测器标定方法
Gated integrator method in the calibration of photoconductive detector
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摘要: 为了用同步辐射光源完成对光电导探测器的标定工作，用门控积分方法代替基于高性能宽带示波器的高灵敏测量系统，改进了前端放大器，带宽达到了2.9 GHz，改进后的门控积分系统灵敏度达到2.8×10-18 C/bit。在北京同步辐射装置进行了金刚石探测器的灵敏度动态标定实验，针对碳、铝、镍、铁多种薄滤波片进行了测量，获得了具有比较好的信噪比结果。从试验结果可以初步得出样品探测器在长波段响应（50～280 eV）比较灵敏，在原理上验证了这种方法的可行性。Abstract: To calibrate photoconductive detectors with the synchrotron soft X-ray source, a new method based on gated integration has been proposed. It will replace the high sensitive measurement system based on high performance oscilloscopes and improve the preamplifier, of which the band reaches 2.9 GHz. The sensitivity of the gated integrator is 2.8×10-18 C/bit . The sensitivity dynamic calibration of the diamond detector has been completed at the Beijing Synchrotron Radiation Facility (BSRF) using the new method. A better signal noise rate has been got on the C,Al,Ni,Fe thin filter. The results of the test show that the sample detector is more sensitive on long wave band (50～280 eV) and this method is feasible in principle.
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Key words:
- photoconductive detectors /
- icf /
- calibration /
- gated integration
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