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利用光腔衰荡法测量反射率,探测器性能对衰荡信号的测量有很大影响,具有不同时间响应和灵敏度特性的探测器会得到不同的信号衰荡曲线起始点和信号淹没点。对于性能相同的探测器,在测量反射率不同的反射镜时,也会得到不同的信号淹没点。在数据拟合过程中,截取不同的数据起始点和信号淹没点,会得到不同的衰荡时间,从而影响反射率的测量精度。对衰荡信号进行对数变换,首次利用χ2拟合对数据进行处理,通过对有效拟合数据与斜率误差关系的分析,得到了最佳拟合数据点截取的方法。实验证明:此方法可有效处理无效光信号和噪声信号的分界点,给出了衰减时间的数据截取依据,有助于改善时间衰荡法测试的精度和重复性。
Using the optical cavity decay method to measure the reflectivity, the performance of the detector has a great influence on the measurement of the ring-down signal. The detectors with different time-response and sensitivity characteristics will get different starting points and signal inundation points. For detectors with the same performance, different signal flooding points are also obtained when measuring reflectors with different reflectivities. In the process of data fitting, different starting points of data and submerged signals will be intercepted, and different ringing times will be obtained, which will affect the measuring accuracy of reflectivity. The logarithmic transformation of the ringing signal is carried out. The data is processed by χ2 fitting for the first time. By analyzing the relationship between the fitting data and the slope error, the best fitting data point interception method is obtained. Experiments show that this method can effectively deal with the demarcation point of the invalid optical signal and the noise signal, and give the data interception basis of the decay time, which is helpful to improve the accuracy and repeatability of the time-decay method.