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Home > Technology > TDLAS
What is TDLAS

The laser gas analyzer is based on Tunable Diode Laser Absorption Spectroscopy (TDLAS), which uses the narrow line width and tunable characteristics of semiconductor lasers to analyze individual absorption lines of gas molecules. The laser frequency is modulated by modulating the working current of the semiconductor laser, so that when the laser beam of a specific wavelength emitted by the semiconductor laser passes through the measuring pipeline, it is frequency-selectively absorbed by the measured gas, and the laser intensity is attenuated. The lock-in amplifier is used to photoelectricity at the receiving end. The optical signal detected by the detector is demodulated, and combined with the Beer-Lambert relationship between the gas concentration and the laser absorption spectrum, the concentration of the measured gas is obtained.

What is TDLAS technology

TDLAS In-situ Type
TDLAS Extractive Type
Typical Application Fields
• Coal-fired power plant   • Aluminum plant   • Steel plant   • Smelting plant   • Glass plant   • Waste power plant   • Cement plant   • Chemical plant
Model Configuration Measurements Measurement Range Accuracy Measurement Purpose
Laser Ammonia Slip Gas AnalyzerGasTDL-3000 Single Gas NH3
*Ready Solution
0-20ppm up to 0-9999ppm

* Other ranges available on request


SCR or SNCR denitrification device NH3 gas slip emission monitoring and process monitoring.

*Available on Request
O2: 0-1% up to 0-100%
CO: 0-1000ppm up to 0-100%
CH4: 0-1000ppm up to 0-20%
H2S: 0-10ppm up to 0-5%
H2O: 0-10ppm up to  0-5000 ppm
CO2: 0-10ppm up to 0-5%
C2H2: 0-10ppm up to  0-5000 ppm

* Other ranges available on request

2% • Safety control
• Process Cotrol
• Inertization
Related Products
  • GasTDL 3000
    Laser Ammonia Slip Gas Analyzer
  • GasTDL-3100
    In-situ Laser Process Gas Analyzer
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