利用光学连续相位扫描和正弦相位调制相结合，提出一种ESPI时间平均测振的定量分析方法。由于采用光学连续相位扫描，该方法具有较强的抗环境干扰能力，不需要精确校准光学相移器，并且能自动定量地给出物体的全场振幅分布。

In this paper, the phase continue scan is combined with the sinusoidal phase modulation to determine the vibration amplitude of object by time-average ESPI. Because the phase continue scan technique is adopted, this method has the advantage of a high anti-disturbance capability without exactly calibrating the optical phase-shifter.