Next Article in Journal
Experimental Evaluation of the Packet Reception Performance of LoRa
Previous Article in Journal
Trajectory Planning of Flexible Walking for Biped Robots Using Linear Inverted Pendulum Model and Linear Pendulum Model
 
 
Communication

A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized Wavelength Modulation Spectroscopy

1
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Institute of Laser, Shandong Academy of Sciences, Jinan 250014, China
*
Author to whom correspondence should be addressed.
Academic Editor: Anna Chiara De Luca
Sensors 2021, 21(4), 1073; https://doi.org/10.3390/s21041073
Received: 18 December 2020 / Revised: 29 January 2021 / Accepted: 1 February 2021 / Published: 4 February 2021
(This article belongs to the Section Optical Sensors)
By combining frequency-division multiplexing and normalized wavelength modulation spectroscopy, a robust remote multi-species sensor was developed and demonstrated for practical hydrocarbon monitoring. Independently modulated laser beams are combined to simultaneously interrogate different gas samples using an open-ended centimeter-size multipass cell. Gas species of interest are demodulated with the second harmonics to enhance sensitivity, and high immunity to laser power variation is achieved by normalizing to the corresponding first harmonics. Performance of the optical sensor was experimentally evaluated using methane (CH4) and acetylene (C2H2) samples, which were separated by a 3-km fiber cable from the laser source. Sub-ppm sensitivity with 1-s time resolution was achieved for both gas species. Moreover, even with large laser intensity fluctuations ranging from 0 to 6 dB, the noise can be kept within 1.38 times as much as that of a stable intensity case. The reported spectroscopic technique would provide a promising optical sensor for remote monitoring of multi hazardous gases with high robustness. View Full-Text
Keywords: multi-species sensor; normalized wavelength modulation spectroscopy; frequency-division multiplexing; remote sensing multi-species sensor; normalized wavelength modulation spectroscopy; frequency-division multiplexing; remote sensing
Show Figures

Figure 1

MDPI and ACS Style

Jin, W.; Zhang, H.; Hu, M.; Hu, M.; Wei, Y.; Liang, J.; Kan, R.; Wang, Q. A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized Wavelength Modulation Spectroscopy. Sensors 2021, 21, 1073. https://doi.org/10.3390/s21041073

AMA Style

Jin W, Zhang H, Hu M, Hu M, Wei Y, Liang J, Kan R, Wang Q. A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized Wavelength Modulation Spectroscopy. Sensors. 2021; 21(4):1073. https://doi.org/10.3390/s21041073

Chicago/Turabian Style

Jin, Wenling, Hui Zhang, Mai Hu, Mengpeng Hu, Yubin Wei, Jingqiu Liang, Ruifeng Kan, and Qiang Wang. 2021. "A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized Wavelength Modulation Spectroscopy" Sensors 21, no. 4: 1073. https://doi.org/10.3390/s21041073

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop