根据液晶的动态响应和位相调制特性，研究了一种利用液晶显示器进行光学检测的检测方法．实验中，把液晶显示器改造为纯位相的空间光调制器，并测定了它的位相调制特性．实验测得：改造后的液晶显示器可实现1λ(λ=632．8nm)的调制量．通过引入相息图的方法，实现了液晶空间光调制器的大位相调制量．并产生了调制量为3．4λ的球面波．最后，利用液晶显示器检测了凸透镜的前表面．检测结果发现，干涉条纹为平行直条纹且PV值为0．32λ．

According to the dynamic response and phase modulation of the liquid crystal,the liquid crystal display (LCD) used for optical testing was investigated in the paper. The LCD was reconstructed into a phase-only spatial light modulator in the experiment. And the phase modulating characteristics were measured. It shows the phase modulation depth is more than one wavelength. The sphere wave with phase modulation magnitude 3.4 λ is achieved by the kinoform method. The former surface of a convex lens was tested by ZYGO interferometer. The parallel straight fringes are obtained and PV is 1/3 λ.