Fast response tunable diode laser spectroscopy for trace gas flux measurements

Gas sensing in industry by tunable diode laser spectroscopy (TDLS)

Laser Diode Gas Spectroscopy

The use of laser sources for optical spectroscopy experimentation is a well-established, cross-disciplinary field with an enormous number of applications in research areas as broad as Physics, Chemistry or Biology (Demtröder, 1996). The high optical intensity achieved with these types of sources, along with the extraordinary monochromaticity of their optical output, has a huge impact in spectro...

Use of diffuse reflections in tunable diode laser absorption spectroscopy: implications of laser speckle for gas absorption measurements

The use of diffusely scattering materials as a means of eliminating interference fringes has been investigated. Their use introduces laser speckle that can contribute a random, rather than periodic, uncertainty to gas measurements. We have established a method for quantifying the uncertainty due to speckle and investigated ways of reducing it. We characterised the speckle at 823nm allowing the ...

18 Laser Diode Gas Spectroscopy

Tunable Diode Laser Absorption Spectroscopy of Oxygen