Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Tunable diode laser absorption spectroscopy
open-in-new
<p>Tunable diode laser absorption spectroscopy (TDLAS, sometimes referred to as TDLS, TLS or TLAS) is a technique for measuring the concentration of certain species such as <a href="/facts/Methane/kBHneYnh">methane</a>, <a href="/facts/Water_vapor/DX5IUFG0">water vapor</a> and many more, in a gaseous mixture using tunable <a href="/facts/Diode_laser/TjHzJteV">diode lasers</a> and <a href="/facts/Laser_absorption_spectrometry/Mlkdxzu8">laser absorption spectrometry</a>. The advantage of TDLAS over other techniques for concentration measurement is its ability to achieve very low detection limits (of the order of <a href="/facts/Parts_per_billion/PozRuoLM">ppb</a>). Apart from concentration, it is also possible to determine the temperature, pressure, velocity and mass flux of the gas under observation. TDLAS is by far the most common <a href="/facts/Laser_absorption_spectrometry/Mlkdxzu8">laser based absorption technique</a> for quantitative assessments of species in gas phase. </p>