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为研究用于X射线脉冲星导航的探测系统性能,推导了在光子计数模式下探测系统的信噪比和最小可探测功率的关系表达式,并搭建测量信噪比和最小可探测功率的实验装置.测量了系统的最小可探测功率以及在不同光功率、不同累积时间和不同阈值电压条件下探测系统的信噪比.通过对X射线光子到达时间的测量,构造了X射线脉冲累积轮廓.实验表明:随着光功率和累积时间的增加,累积脉冲轮廓的信噪比提高,累积脉冲轮廓趋于光滑;当阈值电压为-150mV时,信噪比为26.3,累积脉冲轮廓最优;系统的最小可探测功率为3.5×10-16W.
In order to study the performance of the detection system for X-ray pulsar navigation, the relationship between the signal-to-noise ratio and the minimum detectable power of the detection system in photon counting mode is deduced and an experiment to measure the signal-to-noise ratio and the minimum detectable power The minimum detectable power of the system and the signal-to-noise ratio of the detection system under different optical powers, different accumulation times and different threshold voltages were measured.The X-ray pulse profile was constructed by measuring the arrival time of X-ray photons. Experiments show that with the increase of optical power and accumulation time, the signal-to-noise ratio of cumulative pulse profile increases and the cumulative pulse profile tends to be smooth. When the threshold voltage is -150mV, the signal-to-noise ratio is 26.3 and the cumulative pulse profile is optimal. The minimum detectable power is 3.5 × 10-16W.