为了实现玻璃内应力的高精度测量，提出了一种磁光调制的新方法，建立了基于磁光调制的内应力测量系统。首先，根据偏振光的穆勒矩阵描述方式推导了该系统的测量模型，通过分离被测信号的直流、基频和各次谐波分量，并利用“归一化”的方法，消除了光强波动对测量结果的影响，并根据处理接收到的各信号分量得到玻璃内应力方向和应力双折射大小。通过测量玻璃的不同位置验证了该方法的有效性，内应力方向的测量精度为5〞，应力双折射的测量精度低于0.5 nm/cm，且系统具有稳定性高、精度高等特点。%In order to achieve the high-precision measurement of glass internal stress, a new method of magneto-optical modulation was proposed, and the system of internal stress measurement based on the magneto-optical modulation was established. First, measurement model of the system was derived according to the Mueller matrix description method of polarized light, by using separation of the direct current, fundamental frequency and the second harmonic component of detected signals, and "normalized"approach, the impact of the light source intensity fluctuation on the measurement result was eliminated. The direction of glass internal stress and the size of stress birefringence values were received by processing the respective signal components. By measuring the glass at different positions, the validity of the method is verified, and the measurement accuracy of internal stress direction is 5〞, the measurement accuracy of stress birefringence value is below 0.5 nm/cm. This system has high stability and high accuracy.
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