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作者机构：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
出 版 物：《Photonic Sensors》 (光子传感器（英文版）)
年 卷 期：2018年第8卷第2期
页 面：127-133页
核心收录：
学科分类：080902[工学-电路与系统] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学]
基 金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 61405105 & 61475085) the Shandong Provincial Natural Science Foundation China (Grant No. ZR2014FQ015) Science and Technology Development Project of Shandong Province (Grant No. 2014GGX101007) and the Fundamental Research Funds of Shandong University (Grant Nos. 2014HW016 & 2014YQ011)
主 题：QEPAS system preamplifier circuit frequency locked method noise optimization
摘 要：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.
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