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| 1 | Multi-Component and Multi-Point Trace Gas Sensing in Wavelength Modulation Spectroscopy Based on Wavelength Stabilization显示文摘Multi-component and multi-point trace gas sensing in the wavelength modulation spectroscopy is demonstrated based on the frequency-division multiplexing and time-division multiplexing technology.A reference photodetector is connected in series with a reference gas cell with the constant concentration to measure the second-harmonics peak of the components for wavelength stabilization in real time.The central wavelengths of the distributed feedback lasers are locked to the target gas absorption centers by the reference second-harmonics signal using a digital proportional-integral-derivative controller.The distributed feedback lasers with different wavelengths and modulation frequencies are injected into the gas cell to achieve multi-components gas measurement by the frequency-division multiplexing technology.In addition,multi-point trace gas sensing is achieved by the time-division multiplexing technology using a photoswitch and a relay unit.We use this scheme to detect methane(CH4)at 1650.9 nm and water vapor(H2O)at 1368.597 nm as a proof of principle with the gas cell path length of 10 cm.The minimum detection limits achieved for H2O and CH4 are 1.13 ppm and 11.85 ppm respectively,with three-point gas cell measurement;thus 10.5-fold and 10.1-fold improvements are achieved in comparison with the traditional wavelength modulation spectroscopy.Meanwhile,their excellent R-square values reach 0.9983 and 0.99564 for the concentration ranges of 500 ppm to 2000 ppm and 800 ppm to 2700 ppm,respectively. | Zongliang WANG Jun CHANG Huishan YU Cunwei TIAN Hao ZHANG Xiukun ZHANG Longfei TANG Qinduan ZHANG Yiwen FENG | 2019 | Photonic Sensors2019，9，4： | 2 |
| 2 | 面向阵列式换能器的4通道压控放大滤波电路显示文摘针对阵列式换能器信号检测特点,提出相应的后置放大电路设计指标,设计一款4通道压控放大滤波电路。搭建测试平台,对所提电路的4通道一致性、电路固定增益、可调增益及工作频带等指标进行测试。结果表明,电路4通道具有良好的一致性,频带内增益起伏小,固定增益约为40 dB,带外增益衰减明显,可调增益范围为-20~20 dB,工作频带为10.6~15.5 kHz,工作频带存在高频偏移现象,其他指标满足设计要求。4通道压控放大滤波电路设计对阵列式换能器动态小信号检测具有参考意义。 | 陈谋 姜清华 李安阳 | 2023 | 电声技术2023，47，9： | 0 |
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