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Research of optical rotation measurement system based on centroid algorithm.

Junjie Cao1, Hongzhi Jia1, Xinrong Shen1

  • 1Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.

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A new optical rotation measurement system uses a digital signal processor and centroid algorithm for precise angle determination. This accurate and repeatable system is validated using quartz and glucose solutions.

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Area of Science:

  • Optics and Photonics
  • Analytical Chemistry
  • Instrumentation Science

Background:

  • Optical rotation is a key property for characterizing chiral substances.
  • Accurate measurement of optical rotation is crucial in pharmaceutical and chemical industries.
  • Existing methods may face limitations in speed, accuracy, or complexity.

Purpose of the Study:

  • To develop and validate a novel optical rotation measurement system.
  • To implement a digital signal processor (DSP) and centroid algorithm for enhanced performance.
  • To achieve high accuracy and reliable repeatability in optical rotation measurements.

Main Methods:

  • Established an optical rotation measurement system incorporating a modulated laser, step motor rotating stage, and DSP.
  • Utilized a centroid algorithm to process light signals and determine optical rotation angles.
  • Experimentally validated the system using standard quartz tubes and glucose solutions.

Main Results:

  • The developed system achieved a relative error of 0.4%.
  • The system demonstrated a precision of 0.004°.
  • Experimental results confirmed the system's reliable repeatability and high accuracy.

Conclusions:

  • The established optical rotation measurement system offers high accuracy and precision.
  • The integration of DSP and centroid algorithm provides an efficient measurement approach.
  • The system is suitable for reliable characterization of optically active substances.