摘要
针对微结构的偏转角度测试需求,设计并搭建了一套基于显微光杠杆技术的角度测量系统。该系统将光杠杆光路与无限共轭显微光路相结合,所得聚焦光斑直径小于10μm;采用电流模式电路处理四象限探测器输出信号,系统理论带宽超过5MHz;系统对微结构的转角测量分辨力和理论量程分别可达1.2″和±4°。利用该系统测量了原子力显微镜微悬臂梁探针在步进载荷下的偏转情况,测量结果与铁摩辛柯梁理论计算一致,验证了系统的可靠性。
A microscope system for the deflection angle measurement of microstructures is presented. The micro- scope consists of an infinite conjugate imaging system and an integrated optical lever. The laser beam of the optical lever is focused by the infinite objective to a size less than 10μm. A current-mode circuit is designed for signal processing for the optical lever, and 5 MHz in bandwidth is achieved. The measurement range and resolution of the system are ±4° and 1.2″, respectively. As a test, the system is used to measure the deflection angles at the free end of a cantilever probe of atomic force microscope under step load. The measurement results are consistent well with the calculation by using Timo- shenko beam theory.
出处
《光学技术》
CAS
CSCD
北大核心
2014年第3期219-224,共6页
Optical Technique
基金
国家自然科学基金(61204117
51075297)
863计划项目(2012AA041204)
关键词
光学测量
微结构
光杠杆
偏转角
电流模式
optical measurement
microstructure
optical lever
deflection angle
current-mode
