Dealing With Speckle Effects in Self-Mixing Interferometry Measurements

被引:34
|
作者
Atashkhooei, Reza [1 ]
Royo, Santiago [1 ]
Azcona, Francisco J. [1 ]
机构
[1] Univ Politecn Cataluna, Res Ctr CD6, Barcelona 08222, Spain
关键词
Displacement measurement; interferometry self-mixing; speckle effect; LASER-DIODE; DISPLACEMENT;
D O I
10.1109/JSEN.2013.2240156
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
An analysis of speckle effects and the techniques to overcome them in self-mixing interferometry signals is presented. We characterize the effect of surface roughness and laser spot size on the speckle modulation of the signal, and then propose two simple experimental approaches to overcome the amplitude fading induced by the speckle effect. Unlike the techniques proposed until now, our first approach uses an adaptive optical element in the form of a voltage-programmable liquid lens, which adaptively changes its focal length to modify the speckle pattern. Our second approach combines two laser signals which present different performance parameters. By using any of these simple methods, the introduction of inaccuracies in the measurement process due to speckle is avoided.
引用
收藏
页码:1641 / 1647
页数:7
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