Photonic Sensors, 2018, 8 (2): 127, 网络出版: 2018-08-04  

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

SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique
作者单位
1 School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan, 250100, China
2 School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng, 252059, China
摘要
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.

Qinduan ZHANG, Jun CHANG, Zongliang WANG, Fupeng WANG, Fengting JIANG, Mengyao WANG. SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique[J]. Photonic Sensors, 2018, 8(2): 127. Qinduan ZHANG, Jun CHANG, Zongliang WANG, Fupeng WANG, Fengting JIANG, Mengyao WANG. SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique[J]. Photonic Sensors, 2018, 8(2): 127.

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