ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

For citation:

Vishnyakov G. Н., Yurin A. И., Minaev V. Л., Golopolosov A. A. Analysis of the accuracy of the signal processing algorithm of the differential phase polarimeter. Izvestiya VUZ. Applied Nonlinear Dynamics, 2023, vol. 31, iss. 4, pp. 408-420. DOI: 10.18500/0869-6632-003047, EDN: VVWJWG

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Language: 
Russian
Heading: 
Applied Problems of Nonlinear Oscillation and Wave Theory
Article type: 
Article
UDC: 
543.454; 517.44
DOI: 
10.18500/0869-6632-003047
EDN: 
VVWJWG

Analysis of the accuracy of the signal processing algorithm of the differential phase polarimeter

Autors: 
Vishnyakov Gennady Николаевич, All-Russian Research Institute for Optical and Physical Measurements
Yurin Alexander Игоревич, National Research University "Higher School of Economics"
Minaev Vladimir Леонидович, All-Russian Research Institute for Optical and Physical Measurements
Golopolosov Alexander Andreevich, All-Russian Research Institute for Optical and Physical Measurements
Abstract: 

The purpose of this work is to analyze the effect of the polarimeter signal processing algorithm on the results of measurements of the optical rotation angle of the polarization plane to improve the accuracy of measurements in differential polarimetry.

Methods. The paper considers the methods of polarimetry used for the analysis of optically active substances, based on the methods of phase measurements used to calculate the optical rotation angle. The expediency of using the Fourier transform to calculate the phase difference of differential polarimeter signals is noted. To analyze the error of the algorithm, mathematical modeling of the measurement information processing for various signal parameters is applied.

Results. The results of the study of the effect of the bit depth of the analog-to-digital converter, the number of samples over the period of the signal and the accumulation time on the accuracy of restoring the phase difference are presented. The influence of the ratio of signal amplitudes and the level of amplitude and phase noise caused by the imperfection of the measuring system has also been investigated.

Conclusion. The obtained results make it possible to optimize the operating mode and improve the accuracy of the optical rotation angle measurements using a differential phase polarimeter based on the Fourier transform.

Key words: 
polarimetry
optical rotation angle
phase measurements
harmonic signal analysis
amplitude and phase noise
Fourier transform
Acknowledgments: 
This work was supported by All-Russian Research Institute for Optical and Physical Measurements
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Received: 
05.04.2023
Accepted: 
14.04.2023
Available online: 
27.06.2023
Published: 
31.07.2023
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