为了对畸变波前进行精确校正,研究了液晶波前校正器在不同灰度级之间的动态位相响应特性,准确确定其响应时间.首先给出液晶波前校正器的响应时间和位相变化的检测方案.然后检测了液晶波前校正器在0和255灰度级之间的上升和下降时间,分别为7 ms和11 ms.在保证校正精度的条件下,对该位相曲线采取λ/10的误差截断,使上升和下降时间分别减少到4 ms和6.8 ms.最后,研究了各灰度级依次上升到255和从255再以次回落到各灰度级的动态响应时间.结果表明,各灰度级的上升时间在2～5.2 ms之间变化,下降时间在3.66～8.74 ms之间变化,且无论是上升还是下降,150和255灰度级之间转换速度最快,在255灰度级邻近的灰度响应速度最慢,且响应时间长于0和255灰度之间的响应时间.因此,在波前校正中,须以255灰度邻近的灰度级中最长的响应时间作为液晶波前校正器的响应时间,以确保波前校正精度.
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