Chakraborty, Arup LalArup LalChakraborty2025-09-042025-09-042011-12-03https://d8.irins.org/handle/IITG2025/30759Industrial gas monitoring applications have greatly benefited from recent developments in tunable diode laser spectroscopy which is the industry standard in non-invasive, real-time measurement. Calibration-free wavelength modulation spectroscopy (WMS) techniques have obviated the need for signal calibration. This paper presents a comparison of some of the significant recent developments in this field.en-USGasLaserSpectroscopyConference PaperConference Paper123456789/493