Design of a Laser Driver and Its Application in Gas Sensing
Design of a Laser Driver and Its Application in Gas Sensing
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DOI：
10.3390/app12125883
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Menglong Cong;Shanshan Zhang;Yiding Wang;Dachao Liang;Kunpeng Zhou
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文献类型：
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作者：
Menglong Cong;Shanshan Zhang;Yiding Wang;Dachao Liang;Kunpeng Zhou
设计了一种高稳定性、图形化用户界面的激光驱动器，并将其应用于痕量气体传感。激光驱动程序的运行由嵌入实时操作系统的ARM处理器管理。通过点击配置了emWin图形用户界面（GUI）的触摸屏，可以图形化地设置和监控驱动电流的参数。将分布反馈半导体激光器（DFB-LD）的电路模型引入到TINA-SPICE仿真中，对电流源的性能进行了评估。通过仿真，可以直观地预测潜在的自激振荡，并对反馈回路进行适当的补偿。为了验证该方法的适用性，将该激光驱动器用于驱动精心选择的DFB-LD，并将其用于波长调制光谱（WMS）中，在2ν3泛音的R（3）吸收线处检测CH 4。在室温、常压和有效吸收路径为15.4 cm的条件下，对浓度为400 ppm ~ 1%的气体样品进行了重复性实验，由信噪比（SNR）得到的检测限为7.2 ppm。有希望的结果表明，这种激光驱动器用于基于吸收光谱的传感应用的高潜力。
A laser driver which features high stability and a graphical user-interface was designed and used in trace gas sensing. The running of the laser driver was managed by an ARM processor which was embedded with a real-time operating system (RTOS). Through clicking on the touch screen that was configured with an emWin graphical user-interface (GUI), the parameters of the driving current can be graphically set and monitored. The circuit model of the distributed feedback laser diode (DFB-LD) was introduced into a TINA-SPICE simulation to evaluate the performance of the current source. Through simulation, the potential self-oscillation can be visually predicted, and the feedback loop can be appropriately compensated. To validate the applicability, the laser driver was used for driving a carefully selected DFB-LD and was employed in wavelength modulation spectroscopy (WMS) for CH4 detection at R(3) absorption line of the 2ν3 overtone. Under the conditions of room temperature, normal pressure and an effective absorption path of 15.4 cm, repetitive experiments were conducted using gas samples, with their concentrations ranging from 400 ppm to 1%, and the detection limit derived from the signal-to-noise ratio (SNR) was 7.2 ppm. The promising result indicates the high potential of this laser driver for use in absorption spectrum-based sensing applications.