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Regular | Open Access

SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique

Qinduan ZHANG1, Jun CHANG1( ), Zongliang WANG2, Fupeng WANG1, Fengting JIANG1, Mengyao WANG1
School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan, 250100, China
School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng, 252059, China
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Abstract

Preamplifier circuit noise is of great importance in quartz enhanced photoacoustic spectroscopy (QEPAS) system. In this paper, several noise sources are evaluated and discussed in detail. Based on the noise characteristics, the corresponding noise reduction method is proposed. In addition, a frequency locked technique is introduced to further optimize the QEPAS system noise and improve signal, which achieves a better performance than the conventional frequency scan method. As a result, the signal-to-noise ratio (SNR) could be increased 14 times by utilizing frequency locked technique and numerical averaging technique in the QEPAS system for water vapor detection.

Keywords

QEPAS systempreamplifier circuitfrequency locked methodnoise optimization

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Photonic Sensors
Volume 8 Issue 2,
June 2018
Pages 127-133
DOI: 10.1007/s13320-018-0468-y

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Cite this article:
ZHANG Q, CHANG J, WANG Z, et al. SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique. Photonic Sensors, 2018, 8(2): 127-133. https://doi.org/10.1007/s13320-018-0468-y

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Received: 19 September 2017
Revised: 11 March 2018
Published: 21 March 2018
© The Author(s) 2018.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.