Abstract
A simple optical sensing system based on laser speckle and lensing for monitoring refractive index variations of fluids is proposed and demonstrated. The fluid of interest is contained in a cylindrical glass vessel, which acts as an optical lens whose focal length depends on the refractive index of the fluid. Focal length variations imply optical wavefront alterations that are revealed through laser speckle pattern correlation. The device exhibits a refractive index resolution on the order of 10−6, which is comparable to those of more complex and costly refractometric sensors and demonstrates the benefits of combining these two optical techniques. The simplicity and high sensitivity of the presented configuration make it greatly suitable for a variety of applications ranging from chemical sensing to specimen detection.
Published Version
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