光子学报, 2018, 47 (4): 0423001, 网络出版: 2018-03-15   

中红外量子级联激光气体检测系统

Mid-infrared Quantum Cascade Laser Gas Detection System
作者单位
1 吉林大学 电子科学与工程学院, 集成光电子学国家重点联合实验室吉林大学实验区, 长春 130012
2 吉林大学 生物与农业工程学院, 长春, 130022
摘要
为了满足基于室温连续量子级联激光器(QCL)的中红外气体检测系统的需求, 研制了板级量子级联激光器的驱动电路以及谐波锁相放大电路。通过信号发生电路产生高精度的直流偏置信号、低频锯齿波扫描信号和高频正弦波调制信号, 控制激光器的工作电流, 进而扫描/调制激光器的输出波长; 为了探测痕量气体吸收光谱的二次谐波信号, 并获得较高的信噪比, 研制了锁相放大电路, 主要包括倍频电路、正交转换电路和数据转换电路; 为了提高系统的稳定性和可靠性, 研制了高稳定性的线性供电电路以及保护电路.采用中科院半导体所研制的波长为4.76 μm的QCL作为光源, 开展了电学系统的功能验证实验以及气体检测实验.实验结果表明: QCL驱动电路线性度为0.006 3%, 长期电流稳定度为5.0×10-5, QCL光强稳定度为5.07×10-4; 锁相放大器系统具有较高的稳定性和较低的误差, 一次谐波的最大误差在2.4%以内, 二次谐波的最大误差在5.5%以内.通过动态配气方式开展了低浓度一氧化碳(CO)气体检测实验, 在0~100 ppm范围内, 二次谐波信号的幅值与CO气体浓度具有较高的线性度(拟合优度>0.99), 表明所研制的电学系统具有良好的稳定性和可靠性, 为中红外CO气体的检测提供了安全可靠的保障.
Abstract
To meet the requirement of mid-infrared gas detection based on continuous Quantum Cascade Laser (QCL), a board-level QCL driver and a lock-in amplifier are developed. High-precision direct-current (DC) bias signal, low-frequency saw-tooth scan signal and high-frequency sine-wave modulation signal are generated by a signal generation circuit to control the laser current and scan/modulate laser output wavelength. The developed lock-in amplifier includes a multiple frequency circuit, an orthogonal conversion circuit, and a data-conversion circuit, which detects the second harmonic (2f) signal from the trace gas absorption signal and gains a high signal-to-noise ratio. In addition, in order to improve the stability and reliability of the system, a linear power supply with high stability and a high-performance protection circuit are designed. A QCL with a wavelength of 4.76 μm developed by the Semiconductor Institute of Chinese Academy of Science is used as a light source, and function verification and gas detection experiments of the electrical system are carried out. The experimental results show that the linearity of laser driver is as high as 0.006 3%, the long-term current stability is 5.0×10-5, and the long-term power stability of QCL is 5.07×10-4. The lock-in amplifier has an average detection error on the first harmonic (1f) signal of less than 2.4% and an error on the 2f signal of less than 5.5%. Low-concentration carbon monoxide (CO) detection is carried out, and there is a high linearity (R2>0.99) between the amplitude of 2f signal and CO gas concentration in the concentration range of 0-100 ppm. These results confirm that the developed electrical system has good stability and reliability, assuring a safe and reliable mid-infrared CO gas detection.

蔺百杨, 党敬民, 郑传涛, 张宇, 王一丁. 中红外量子级联激光气体检测系统[J]. 光子学报, 2018, 47(4): 0423001. LIN Bai-yang, DANG Jing-min, ZHENG Chuan-tao, ZHANG Yu, WANG Yi-ding. Mid-infrared Quantum Cascade Laser Gas Detection System[J]. ACTA PHOTONICA SINICA, 2018, 47(4): 0423001.

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