为了实现脉冲信噪比(SNR)的高动态范围测量，确保测量结果的准确性，研究了信噪比测量标定方法。当光束入射到玻璃反射镜上时会在前后表面之间产生多次反射，这些反射光之间的强度依次递减，时间间隔是固定的。提出了信噪比测量系统的标定方法，计算了反射镜上的多次反射光的理论公式。实验结果表明，后表面上的相邻两次反射光之间的光程延迟都近似等于24 mm，而且相对强度的衰减量都在10-2数量级。通过分析脉冲序列，可判断该信噪比测量系统的动态范围在2.6×10-8左右。分析了材料吸收和群速度色散对信噪比测量系统的影响，确认这两个因素对信噪比测量的影响可以忽略。

In order to get a high dynamic range in pulse signal-to-noise ratio (SNR) measurement and ensure a high measurement accuracy, a research is taken on the calibration of pulse SNR measurement. As we know, a beam will generate multiple reflections with a fixed interval between every two neighboring reflections when it reaches a glass mirror. The light intensity will suffer the degression caused by these reflections. A calibration method for the pulse SNR is provided, and a formula for calculating the multiple reflections from glass mirror is established. Experimental results show that between two neighboring reflections from the back surface, the optical path delays are always close to 24 mm, and the attenuations of relative intensities are always about 10-2. From the analysis on pulse sequence, the dynamic range of the pulse SNR measurement is obtained to be about 2.6×10-8. Furthermore, the effects of material absorption and group velocity dispersion to pulse SNR measurement are also discussed, and it is found that these two factors are neglectable.