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Open AccessArticle

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

State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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Academic Editor: Krzysztof M. Abramski
Sensors 2021, 21(7), 2448; https://doi.org/10.3390/s21072448
Received: 27 January 2021 / Revised: 2 March 2021 / Accepted: 4 March 2021 / Published: 2 April 2021
(This article belongs to the Section Optical Sensors)
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. View Full-Text
Keywords: tunable diode laser absorption spectroscopy; wavelength modulation spectroscopy; 2f/1f signal processing technique; wavelength-locked; remote sensor tunable diode laser absorption spectroscopy; wavelength modulation spectroscopy; 2f/1f signal processing technique; wavelength-locked; remote sensor
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MDPI and ACS Style

Lu, H.; Zheng, C.; Zhang, L.; Liu, Z.; Song, F.; Li, X.; Zhang, Y.; Wang, Y. A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring. Sensors 2021, 21, 2448. https://doi.org/10.3390/s21072448

AMA Style

Lu H, Zheng C, Zhang L, Liu Z, Song F, Li X, Zhang Y, Wang Y. A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring. Sensors. 2021; 21(7):2448. https://doi.org/10.3390/s21072448

Chicago/Turabian Style

Lu, Hongbin; Zheng, Chuantao; Zhang, Lei; Liu, Zhiwei; Song, Fang; Li, Xiuying; Zhang, Yu; Wang, Yiding. 2021. "A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring" Sensors 21, no. 7: 2448. https://doi.org/10.3390/s21072448

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