Paul, DurlavDurlavPaulDe, ShrutiShrutiDeGrattan, Kenneth T.V.Kenneth T.V.GrattanChakraborty, Arup LalArup LalChakraborty2025-08-312025-08-312023-01-01[9781665461634]10.1109/APSCON56343.2023.101013162-s2.0-85158030895https://d8.irins.org/handle/IITG2025/27036This 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.falseremote pollution monitoring | Water vapour measurement | wavelength modulation spectroscopyConference Paper20230cpConference Proceeding0