How does TDLAS work?

TDLAS measures the wavelength-dependent absorption of light through a gas medium. When the wavelength of light matches one absorption line of a gas species present in the sample, the photodetector records a reduction in the light intensity.

What is TDLAS technology?

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 methane, water vapor and many more, in a gaseous mixture using tunable diode lasers and laser absorption spectrometry.

How does laser spectroscopy work?

In laser spectroscopy, chemists train a laser beam on a sample, yielding a characteristic light source that can be analyzed by a spectrometer. Most of the light bouncing off the sample scatters at the same wavelength as the incoming light, but some of the light does scatter at different wavelengths.

What is the name of diode used in tunable detector?

Gunn diodes are used to build oscillators in the 10 GHz to high (THz) frequency range.

Can a TDL analyzer be used with an oxygen analyzer?

For example, an oxygen gas analyzer can be paired with a filter probe to allow you to install an oxygen TDL analyzer in a gas stream that has heavy particulate. That same oxygen gas analyzer can be paired with a wafer adaption to create an in-line TDL gas analyzer for oxygen in a small line size (down to DN50).

How is TDLAS used in gas phase spectroscopy?

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 laser based absorption technique for quantitative assessments of species in gas phase.

Which is an advantage of TDLAS over other techniques?

The advantage of TDLAS over other techniques for concentration measurement is its ability to achieve very low detection limits (of the order of ppb ). Apart from concentration, it is also possible to determine the temperature, pressure, velocity and mass flux of the gas under observation.

What can be done with a Mettler Toledo TDL analyzer?

METTLER TOLEDO’s unique process adaptions, make it possible to use a TDL gas analyzer in applications previously considered impossible for an in situ TDL analyzer. Oxygen Measurement with a TDL Gas Analyzer: direct chlorination and oxy-chlorination, VCM waste gas recovery, FCC units, etc.