Sensitive detection of NO2 using high‐frequency heterodyne spectroscopy with a GaAlAs diode laser
Sensitive detection of NO2 using high‐frequency heterodyne spectroscopy with a GaAlAs diode laser
复制标题
使用 GaAlAs 二极管激光器高频外差光谱法灵敏检测 NO2
DOI：
10.1063/1.96297
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发表时间：
1985
影响因子：
4
通讯作者：
M. Gehrtz
中科院分区：
文献类型：
--
作者：
W. Lenth;M. Gehrtz
在250 MHz下调制GaAlAs二极管激光器的注入，进行光外差光谱。使用相敏检测电子器件实现了NO2的灵敏和快速检测。通过适当调整本振相位，可以在零背景下探测到NO2吸收线产生的外差拍频信号。在有效带宽为6 Hz的情况下，测得NO2的最小吸收为1×10−6。增加检测带宽和快速扫描二极管激光器允许在100 ns的时间尺度上检测5×10−4的吸收。所获得的结果表明，光外差光谱与电流调制二极管激光器提供了高灵敏度和快速的时间响应所需的气体物种的检测污染研究，燃烧控制和工业过程监测。
Optical heterodyne spectroscopy has been performed by modulating the injection of a GaAlAs diode laser at 250 MHz. Sensitive and fast detection of NO2 was accomplished using phase‐sensitive detection electronics. By proper adjustment of the local oscillator phase the heterodyne beat signal induced by NO2 absorption lines could be detected against zero background. A minimum NO2 absorption of 1×10−6 was measured with an effective bandwidth of 6 Hz. Increasing the detection bandwidth and scanning the diode laser very rapidly permitted detection of 5×10−4 absorption on a 100‐ns time scale. The obtained results demonstrate that optical heterodyne spectroscopy with current modulated diode lasers offers the high sensitivity and fast time response required for the detection of gaseous species in pollution studies, combustion control, and industrial process monitoring.