Abstract
Temporal phase stepping is the most widely spread method for computer-controlled interferogram evaluation. Well defined phase changes of one of the interfering waves are generated which allow the evaluation of phase values from measured intensity patterns. In most interferometers a mirror is attached to a piezoceramic translator. A movement of the mirror perpendicular to its surface by one wavelength in several steps generates the desired phase changes. A voltage of several 100 V drives this translator. This voltage is generated by means of a DC-DC converter which is controlled by a variable input voltage from a computer. The piezoceramic translator as well as the DC-DC converter are rather expensive.
We demonstrate that a simple and inexpensive piezoceramic loudspeaker is suited for this task as well. It can be directly connected to the computer output voltage without the need of a DC-DC converter. We examined the linearity of the movement and present experimental results. Such a loudspeaker can be used not only for speckle interferometry, but also for interferometry of smooth surfaces and for holographic interferometry.
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© 2000 Springer-Verlag Berlin Heidelberg
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Denker, R., Schilling, R., Haerlin, V., Lau, B. (2000). Phase-stepping Device for Interferometry for Less Than 1 €. In: Jacquot, P., Fournier, JM. (eds) Interferometry in Speckle Light. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-57323-1_55
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DOI: https://doi.org/10.1007/978-3-642-57323-1_55
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-63230-3
Online ISBN: 978-3-642-57323-1
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