数字刀口检测技术  

Study on digital knife-edge test

作　　者：张均[1] 董军[1] 张艳[1] 张蓉竹[1] 蔡邦维[1] 

机构地区：[1]四川大学光电科学技术系,四川成都610064

出　　处：《光电工程》2005年第5期65-68,共4页Opto-Electronic Engineering

摘　　要：为便捷地定量检测大口径光学元件面形,运用数字刀口检测技术,把传统刀口仪与CCD图像采集处理、计算机辅助计算相结合,构成数字刀口仪。采用图像处理来确定阈值对应的刀口位置,引入PSD来描述频域信息。对125mm和150mm口径的球面镜进行检测,实现了传统刀口仪不能完成的定量检测,获得了面形分布,检测精度P-V值达到0.12λ(λ=532nm)。通过与干涉仪测得P-V值0.057λ相比较,验证了数字刀口检测的可行性,而且得到的数据还可进一步进行像差分析,为镜面误差的加工修正提供依据。In order to conveniently and quantitatively test the surface shape of large aperture optics, a digital knife-edge tester is integrated with a traditional knife-edge tester, CCD image processing and a computer aid calculation. The knife-edge position corresponding to the threshold is determined by image processing technique and the frequency spectrum is described by introduction of parameter PSD. Test for spherical mirrors with apertures of 125 mm and 150 mm shows that the integrated tester can implement quantitative test that the traditional knife-edge tester fails to do. The tester obtains the surface shape distributions of optics with a test accuracy up to 0.12λ (λ=532 nm). Compared with the P-V value of 0.057λ, obtained by an interferometer, the digital knife-edge tester is feasible. The obtained data can be further used for aberration analysis which provides a basis to update surface error during mirror manufacturing.

关 键 词：检测技术 刀口 数字 大口径光学元件 计算机辅助计算 图像采集处理 定量检测 图像处理 频域信息 面形分布 检测精度 像差分析 CCD PSD 球面镜 干涉仪 传统 V值 阈值 数据 

分 类 号：TP333.4[自动化与计算机技术—计算机系统结构] G623.5[自动化与计算机技术—计算机科学与技术]