Small Deformation Measurements of Diffuse Objects: Phase Stepping by Frequency Drift of a He-Ne Laser

被引：0
|
作者：
Tina L. Helg
Tom H. Barnes
Tim G. Haskell
机构：
[1] University of Auckland,Physics Department
[2] New Zealand Institute for Industrial Research,undefined
来源：
Optical Review | 1997年 / 4卷
关键词：
Light Source; Phase Modulation; Electromagnetism; Specialise Component; Small Deformation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We describe a simple phase-stepping speckle interferometer with large path difference, in which phase modulation is achieved by thermal frequency drift of the He-Ne light source. This system is easy to set up, requires no specialised components, is immune from the effects of piezo actuator hysteresis, and is capable of producing phase maps in which the noise is less than 1/20λ.
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页码：288 / 292
页数：4
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