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An auto-correction laser photoacoustic spectrometer based on 2f/1f wavelength modulation spectroscopy.
Analyst ( IF 3.6 ) Pub Date : 2019-12-24 , DOI: 10.1039/c9an01799b Ke Chen 1 , Shuai Liu , Liang Mei , Feng Jin , Bo Zhang , Fengxiang Ma , Yewei Chen , Hong Deng , Min Guo , Qingxu Yu
Analyst ( IF 3.6 ) Pub Date : 2019-12-24 , DOI: 10.1039/c9an01799b Ke Chen 1 , Shuai Liu , Liang Mei , Feng Jin , Bo Zhang , Fengxiang Ma , Yewei Chen , Hong Deng , Min Guo , Qingxu Yu
Affiliation
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An auto-correction laser photoacoustic (PA) spectrometer based on 2f/1f wavelength modulation spectroscopy (WMS) has been proposed and demonstrated for trace gas detection to eliminate concentration measurement errors due to light power variations. A 1.53 μm distributed feedback (DFB) laser is used as a light source to excite the 2f PA signal that is generated by gas absorption. Meanwhile, a multilayer graphene sheet is employed as a highly efficient photothermal conversion unit for adding a 1f PA background signal, whose amplitude at the absorption center of the traditional PAS system is almost zero. The experimental results show that the gas concentration measured from the 2f/1f WMS signal is almost independent of the laser power. A detection limit of 416 ppb has been achieved for the 1 s measurement interval and could be further improved to 65 ppb with 100 s averaging, according to the Allan deviation analysis.
中文翻译：
基于2f / 1f波长调制光谱的自动校正激光光声光谱仪。
提出了一种基于2f / 1f波长调制光谱（WMS）的自动校正激光光声（PA）光谱仪，该光谱仪已被证明可用于痕量气体检测，以消除由于光功率变化而引起的浓度测量误差。使用1.53μm分布式反馈（DFB）激光器作为光源来激发由气体吸收产生的2f PA信号。同时，使用多层石墨烯片作为高效的光热转换单元，以添加1f PA背景信号，该信号在传统PAS系统的吸收中心处的振幅几乎为零。实验结果表明，从2f / 1f WMS信号测得的气体浓度几乎与激光功率无关。
更新日期：2020-02-17
中文翻译：
基于2f / 1f波长调制光谱的自动校正激光光声光谱仪。
提出了一种基于2f / 1f波长调制光谱（WMS）的自动校正激光光声（PA）光谱仪，该光谱仪已被证明可用于痕量气体检测，以消除由于光功率变化而引起的浓度测量误差。使用1.53μm分布式反馈（DFB）激光器作为光源来激发由气体吸收产生的2f PA信号。同时，使用多层石墨烯片作为高效的光热转换单元，以添加1f PA背景信号，该信号在传统PAS系统的吸收中心处的振幅几乎为零。实验结果表明，从2f / 1f WMS信号测得的气体浓度几乎与激光功率无关。
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