A Dual-Gas Sensor Using Photoacoustic Spectroscopy Based on a Single Acoustic Resonator
Source abstract
Abstract
A dual-gas photoacoustic spectroscopy (PAS) sensor based on wavelength modulation spectroscopy (WMS) was developed and experimentally demonstrated. Distributed feedback (DFB) laser diodes, emitting at 1512 and 1653 nm, were utilized as the excitation sources for the simultaneous measurement of NH3 and CH4, respectively. The PAS signal was excited by modulating the DFB laser at the first longitudinal resonant frequency of a cylindrical acoustic resonator. Absorption lines for NH3 and CH4 were simultaneously recorded during one frequency scan of the DFB lasers without using any optical switch. The interference of NH3 and CH4 on each other was investigated for accurate detection. The limits of detection (LoDs) of the PAS sensor for NH3 and CH4 for an integration time of 100 s were determined to be 0.1 and 0.3 ppm, respectively. The present PAS sensor provides a new scheme for multi-gas analysis with the advantages of cost-effectiveness, a simple structure and multi-wavelength operation.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Spectroscopy and Laser Applications · Advanced Chemical Sensor Technologies · Atmospheric Ozone and Climate
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang Provincial Key Laboratory for Sensing Technologies, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China
Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
School of Information Science and Engineering, NingboTech University, Ningbo 315100, China
Funding
Key Research and Development Program of Zhejiang Province · NingboTech University · Zhejiang University NGICS Platform, and National Natural Science Foundation of China
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