Measurement of concentration of sugar in solutions with laser speckle decorrelation

Swapnil Mahajan; Vismay Trivedi; Vani Chhaniwal; Mahendra Prajapati; Zeev Zalevsky; Bahram Javidi; Arun Anand

doi:10.1117/12.2184698

22 June 2015 Measurement of concentration of sugar in solutions with laser speckle decorrelation

Swapnil Mahajan, Vismay Trivedi, Vani Chhaniwal, Mahendra Prajapati, Zeev Zalevsky, Bahram Javidi, Arun Anand

Proceedings Volume 9525, Optical Measurement Systems for Industrial Inspection IX; 95253H (2015) https://doi.org/10.1117/12.2184698
Event: SPIE Optical Metrology, 2015, Munich, Germany

Abstract

Measurement of rotation of plane of polarization of linearly polarized light can provide information about the concentration of the optically active system with which it interacts. For substances containing sugar, accurate measurement of rotation of linearly polarized light can provide quantitative information about concentration of sugar in the material. Measurement of sugar concentration is important in areas ranging from blood sugar level measurement in body fluids to measurement of sugar concentrations in juices and other beverages. But in many of these cases, the changes introduced to the state of polarization considering a sample of practical proportion is low and the measurement of low optical rotations becomes necessary. So methods with higher sensitivity, accuracy and resolution need to be developed for the measurement of low optical rotations. Here we describe the development of a compact, low cost, field portable, device for rotation sensing leading to sugar concentration measurements, using speckle de-correlation technique. The developed device measures rotations by determining the changes occurring to a speckle pattern generated by a laser beam passing through the medium under investigation. The device consists of a sample chamber, a diode laser module, a ground glass diffuser and a digital sensor for recording of laser speckle patterns. The device was found to have high resolution and sensitivity.

Citation Download Citation

Swapnil Mahajan, Vismay Trivedi, Vani Chhaniwal, Mahendra Prajapati, Zeev Zalevsky, Bahram Javidi, and Arun Anand "Measurement of concentration of sugar in solutions with laser speckle decorrelation", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95253H (22 June 2015); https://doi.org/10.1117/12.2184698

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