Zero reference signal for displacement measuring systems by use of speckle



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Pérez Quintián, Fernando and Alonso Fernández, José and Atencia Carrizo, Jesús and Bernabeu Martínez, Eusebio (2003) Zero reference signal for displacement measuring systems by use of speckle. Applied Optics, 42 (34). pp. 6797-6803. ISSN 1559-128X

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An optical method for generating a reference signal for an incremental displacement measurement system is proposed. We achieved this zero reference signal by comparing two speckle patterns arriving from two symmetric diffusers, which are used as natural random codes that are identical only when the reading head is located equidistantly between the diffusers. The comparison of the speckles is obtained either by interference, as in a Michelson interferometer, or by intensity correlations.

Item Type:Article
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© 2003 Optical Society of America.
We thank M. Quintanilla for useful comments and discussions. This research has been supported by projects DPI 2001-1238 and DPI 2001-1369 of the Spanish Ministry for Science and Technology.

Uncontrolled Keywords:Reflection, Encoder
Subjects:Sciences > Physics > Optics
ID Code:26761
Deposited On:25 Sep 2014 10:48
Last Modified:25 Sep 2014 10:48

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