Handheld ESPI-speckle interferometer

Rene Skov Hansen

doi:10.1117/12.516645

27 May 2003 Handheld ESPI-speckle interferometer

Rene Skov Hansen

Proceedings Volume 4933, Speckle Metrology 2003; (2003) https://doi.org/10.1117/12.516645
Event: Speckle Metrology 2003, 2003, Trondheim, Norway

Abstract

A "handheld" speckle interferometer for measuring out-of-plane displacements on reflective as well as diffusely scattering object surfaces is presented. The interferometer is a nearly path length compensated set-up which uses diffuse illumination of the object in combination with a speckled reference. The reference wave is established by reflecting a part of the diffuse object illumination from a glass plate located just in front of the object. The glass plate is mounted on a piezoelectric translator in order to control the phase of the reference wave when using phase stepping algorithms. The coherent light source is a laser diode. A web camera with a Universal Serial Bus (USB) interface is employed as the image-capturing device. Likewise, is the piezoelectric translator controlled through the USB interface. The necessary size of the optical set-up depends on the size of the object. The interferometer presented here is a compact version of the set-up, which is capable of measuring displacments of small objects, having either a specularly reflecting- or a diffusely scattering surface. The small optical set-up together with the use of the popular USB-communication for acquiring the images and controlling the phase of the reference wave constitutes a compact "handheld" instrument and eliminates the need for installing extra hardware, such as frame grabber and Digital to Analog converter, in the host computer.

Citation Download Citation

Rene Skov Hansen "Handheld ESPI-speckle interferometer", Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); https://doi.org/10.1117/12.516645

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