Rotation Measurement Using Speckle Photography with LiNbO3 Crystal: Theoretical and Experimental Analysis

Abstract

Photorefractive crystals present varied features charming presence, such as high resolution, and normal handling. Depending on the portability of eras-ing images, photorefractive crystals are convenient for read-write implemen-tations and hence find potential use in speckle photography, speckle interferometry, image processing and holography. A two-beam coupling arrangement using a LiNbO 3 crystal as a recording medium for real-time rotation measurement using the coherent and low-power laser source is presented in this paper. A speckle photography technique is advanced for the measurement of a small rotation of a transmitted glass slide sample. New theoretical analysis is formulated for a general case of a slide rotation. Experimental studies are carried out to verify the outcome of the theoretical predictions and accuracy of measurement. Uncertainty of rotation measurement is studied and quanti-fied. The proposed technique is a simple, attractive and alternative method for fringe analysis. The method promises a high degree of accuracy and in-creased range for rotation measurement in real-time.