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为了提高平行光管测透镜焦距的质量,采用频谱傅里叶变换和液晶显示屏方法。首先给出系统结构图以及测量方程;接着根据液晶显示屏上光斑位置变化的距离,鉴别出平行光管是否离焦,通过液晶显示屏最小像元尺寸计算最大检焦分辨率;然后基于频谱傅里叶变换对液晶显示屏定焦;最后给出了误差分析。实验测量显示液晶显示屏比目视法有更高的精度,测量重复性好。
In order to improve the quality of the focal length of the collimator lens, a spectrum Fourier transform and a liquid crystal display method are used. First of all, the system structure diagram and the measurement equation are given. Then according to the distance of the change of spot position on the liquid crystal display screen, whether the parallel light pipe is defocused is determined, and the maximum detection resolution is calculated by the smallest pixel size of the liquid crystal display screen. Fourier transform of the LCD screen focus; finally gives the error analysis. Experimental measurements show that the LCD screen has a higher accuracy than the visual method, good measurement repeatability.