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

Autor:	Qinduan Zhang, Jun Chang, Zongliang Wang, Fupeng Wang, Fengting Jiang, Mengyao Wang
Jazyk:	angličtina
Rok vydání:	2018
Předmět:	QEPAS system preamplifier circuit frequency locked method noise optimization Applied optics. Photonics TA1501-1820
Zdroj:	Photonic Sensors, Vol 8, Iss 2, Pp 127-133 (2018)
Druh dokumentu:	article
ISSN:	1674-9251 2190-7439
DOI:	10.1007/s13320-018-0468-y
Popis:	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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/19a80669f13b448292dd6a348ec0d09e Zobrazit plný text záznamu Full text from SpringerLink View record in DOAJ