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测量精度达3.2nm的在线表面粗糙度外差干涉仪信号处理系统 总被引:1,自引:1,他引:0
介绍了用于磨床加工的光外差表面粗糙度在线干涉测量仪整机的信号处理系统,着重讨论了其中的两项关键技术,即利用负反馈构成的宽动态范围测量信号的自动电压控制以及依据计大数和测小数相结合的高精度动态相位测量,系统的测量精度达2.6°(相当于3.2nm),允许测量中最大多普勒频移±10kHz(对应高度的变化率±8.75×10^-3m/s)完全满足磨床加工中表面粗糙度在线测量的要求。现场测试证实了这一点,这对 相似文献
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This paper describes a recently introduced laser measurement system based on a new HeNe laser tube. Design principles of laser tube cavity length control, frequency stability measurements, and the limits to measurement resolution extension will be discussed. 相似文献
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本文阐述了高速摄影技术、光谱测温、激光干涉测速和脉冲 X射线摄影的实时光电记录等光学测试技术在中物院流体物理研究所的发展和应用现状。被研究的测试对象均是瞬时高速过程 ,具有时空分辨的要求 ,其时间分辨本领在 ms至 ns范围内 相似文献
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A compact low-cost laser interferometer system for measuring linear displacements with sub-micrometer resolution is described and first performance evaluations reported. The four-photo-diode detectors system can also provide a sensitive, simultaneous indication of straightness in two axes 相似文献
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《Precision Engineering》1999,23(1):39
In this paper, the main causes of scale nonlinearity of a laser interferometer with a single-frequency laser and a quadrature fringe detection system are described. The primary causes of scale nonlinearity are quadrature phase shift error and imperfect optical elements in the interferometer and detection unit. A method for measuring this nonlinearity with an optical compensator is described. Nonlinearities arising from quadrature phase shift error, unequal amplitudes, and electronic offsets in the detection unit can be compensated by means of a PC program as described herein. By using a differential interferometer with a resolution of 0.3 nm, the nonlinearity compensation was experimentally verified, and by averaging the measured values for 20 s, a linearity better than ±0.5 nm was achieved. 相似文献
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宽范围大曲率半径数字化非接触测量系统 总被引:4,自引:0,他引:4
本文提出了一种新颖的利用激光偏振干涉体系产生非接触的牛顿环并与CCD图像处理技术相结合的测量方法。可测量的曲率半径为1~25m,具有很宽的测量范围;非接触测量不会损坏高精度表面;并可测试任意反向率的凹、凸球面,而测试体系结构却非常紧凑。干涉条纹经计算机数据处理可自动、快速获得测量结果。经误差分析,测量的相对误差△R/R优于0.3%。 相似文献
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光热调制半导体激光波长降低干涉测量误差 总被引:4,自引:0,他引:4
本文首次将光源波长的光热调制技术用于正弦相位调制干涉仪中,消除了因直接调制激光波长引起的光强度变化对测量的影响,降低了测量误差。 相似文献