Paper Info
Title
A Remote Sensor System Based on TDLAS Technique for Ammonia Leakage Monitoring
Abstract
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 center dot m at an average time of 2.8 s, and a LoD of 0.5 ppm center dot 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.
Year
DOI
Venue
2021
10.3390/s21072448
SENSORS
Keywords
DocType
Volume
tunable diode laser absorption spectroscopy, wavelength modulation spectroscopy, 2f, 1f signal processing technique, wavelength-locked, remote sensor
Journal
21
Issue
ISSN
Citations 
7
1424-8220
0
PageRank 
References 
Authors
0.34
0
8
Name
Order
Citations
PageRank
Hongbin Lu100.34
Chuantao Zheng200.34
Lei Zhang300.34
zhiwei liu486.86
Fang Song52310.76
Xiuying Li600.34
Yu Zhang700.34
Yiding Wang800.68