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Fully automated, real-time monitoring of ambient water vapour using a compact 1392 nm tunable diode laser-based system

Paul, D., De, S., Grattan, K. T. V. ORCID: 0000-0003-2250-3832 & Chakraborty, A. L. (2023). Fully automated, real-time monitoring of ambient water vapour using a compact 1392 nm tunable diode laser-based system. Paper presented at the IEEE Applied Sensing Conference 2023, 23-25 Jan 2023, Bengaluru, India.


This paper describes the development and deployment of an ambient water vapour measurement system based on tunable diode laser absorption spectroscopy (TDLAS). The system was designed with a near-infrared 1392 nm distributed feedback (DFB) tunable semiconductor laser that targeted the 1391.672 nm absorption line of water vapour. A compact and field-deployable system used made using a combination of a Raspberry Pi unit and Picoscope 2406B for data acquisition, signal processing and estimation of mole fraction using R1f/ΔI1 wavelength modulation spectroscopy (WMS) technique implemented in Python. The battery-powered setup was fully automated and remotely accessible over a wifi connection. The system was mounted on a vehicle and in-field measurements were carried out at fixed locations and with the vehicle moving in Gandhinagar.

Publication Type: Conference or Workshop Item (Paper)
Additional Information: © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publisher Keywords: Water vapour measurement, wavelength modulation spectroscopy, remote pollution monitoring, Raspberry Pi
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Science & Technology > Engineering
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