The detection and measurement of gas concentrations using the characteristic optical
absorption of the gas species is important for both understanding and monitoring a variety of …

Tunable diode laser absorption spectroscopy technology (TDLAS) has been widely applied
in gaseous component analysis based on gas molecular absorption spectroscopy. When …

In this paper, a VCSEL-based oxygen sensor applied for real-time combustion optimization
in furnaces is presented. A diffuse reflector instead of a spherical mirror is used to avoid …

Motivated by the need for an extremely durable and portable instrument to quantify volcanic
CO_2 we have produced a corresponding differential absorption lidar (DIAL). It was tested …

Hollow silica waveguides (HSWs) are used to produce long path length, low-volume gas
cells, and are demonstrated with quantum cascade laser spectroscopy. Absorption …

New designs for gas cells are presented that incorporate transmissive or reflective optical
diffusers. These components offer simple alignment and can disrupt the formation of optical …

Standoff detection is of great significance in greenhouse gas measurement monitoring, early
warning security and leak detection. Variations in topographic characteristics and distances …

We report the effects of self-mixing interference on gas detection using tunable diode laser
spectroscopy. For very weak feedback, the laser diode output intensity gains a sinusoidal …

We have studied the effects of random laser speckle and self-mixing interference on TDLS
based gas measurements made using integrating spheres. Details of the theory and TDLS …

The equivalent absorption path length in an integrating cavity is examined. In an otherwise
excellent paper, Tranchart et al.[Appl. Opt. 35, 7070 (1996APOPAI0003-693510.1364/AO …