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A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring

机译：基于TDLAS技术的氨泄漏监测技术的远程传感器系统

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摘要

The development of an efficient, portable, real-time, and high-precision ammonia (NH3) remote sensor system is of great significance for environmental protection and citizens’ health. We developed a NH3 remote sensor system based on tunable diode laser absorption spectroscopy (TDLAS) technique to measure the NH3 leakage. In order to eliminate the interference of water vapor on NH3 detection, the wavelength-locked wavelength modulation spectroscopy technique was adopted to stabilize the output wavelength of the laser at 6612.7 cm−1, which significantly increased the sampling frequency of the sensor system. To solve the problem in that the light intensity received by the detector keeps changing, the 2f/1f signal processing technique was adopted. The practical application results proved that the 2f/1f signal processing technique had a satisfactory suppression effect on the signal fluctuation caused by distance changing. Using Allan deviation analysis, we determined the stability and limit of detection (LoD). The system could reach a LoD of 16.6 ppm·m at an average time of 2.8 s, and a LoD of 0.5 ppm·m at an optimum averaging time of 778.4 s. Finally, the measurement result of simulated ammonia leakage verified that the ammonia remote sensor system could meet the need for ammonia leakage detection in the industrial production process.
机译：高效，便携，实时和高精度氨（NH3）遥控传感器系统的开发对于环境保护和公民的健康具有重要意义。我们开发了一种基于可调二极管激光吸收光谱（TDLA）技术的NH3遥控传感器系统，以测量NH3泄漏。为了消除NH 3检测对水蒸气的干扰，采用波长锁定波长调制光谱技术稳定6612.7cm-1的激光器的输出波长，从而显着增加了传感器系统的采样频率。为了解决问题的问题，即通过检测器接收的光强度不断变化，采用了2F / 1F信号处理技术。实际应用结果证明，2F / 1F信号处理技术对由距离变化引起的信号波动具有令人满意的抑制效果。使用Allan偏差分析，我们确定了检测的稳定性和限制（LOD）。该系统可以在2.8秒的平均时间达到16.6ppm·m的距离，并且在778.4秒的最佳平均时间下的速度为0.5ppm·m。最后，模拟氨泄漏的测量结果证实，氨遥控传感器系统可以满足工业生产过程中对氨泄漏检测的需求。

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