Three-dimensional rigid body motion measurement using speckle fanning in a photorefractive BaTiO3 crystal

Authors: Dharmsaktu, K.S.; Kumar, A.; Singh, K.

Source: Optik – International Journal for Light and Electron Optics, Volume 112, Number 2, February 2001 , pp. 49-56(8)

Publisher: Urban & Fischer

Buy & download fulltext article:


Price: $30.20 plus tax (Refund Policy)


A simple speckle technique, utilizing speckle fanning in a BaTiO3 crystal, is demonstrated for the measurement of rigid body displacement in an arbitrary direction. Collimated laser beam illuminates a diffuser to generate speckles, which are then recorded inside a photorefractive barium titanate crystal thus producing speckle fan. Speckle correlation fringes are formed due to interference between the reconstructed speckle fans corresponding respectively to the initial- and final positions of the diffuser. Displacements occurring in a direction making small angles with the optical axis have been measured by profiling the fringes. The measurement of displacement in a direction making large angle with the optical axis is possible only by taking the Fourier transform of the fringes. This facilitates the separation of transverse and axial correlation peaks giving the transverse and axial components of the motion.

Keywords: 3-dimensional motion; Speckle; beam fanning; photorefractives; speckle metrology

Document Type: Original Article


Publication date: February 1, 2001

Related content



Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page