Global site

ABB's website uses cookies. By staying here you are agreeing to our use of cookies. Learn more

What is an FTIR analyzer?

Share this page

Fourier-transform infrared (FTIR) spectroscopy is an optical technique used to acquire the Infrared spectra of solid, liquid, or gas sample molecules.

Chemical compounds, based on their molecular composition, display different absorptive characteristics  within infrared region, and these distinct spectral fingerprints can be used to characterize and quantify sample material.

Working Principle of an FTIR Analyzer


A typical FTIR analyzer is equipped with an infrared light source, a modulator including moving mirrors which modulate the light, and a sensitive infrared detector. A sample material is placed  within the FTIR analyzer’s optical path typically after the modulator and before the infrared detector. Before this measurement is converted into a useable spectrum, the FTIR analyzer first runs the raw data (known as interferogram) through a mathematical Fourier Transform. This mathematical operation can deconstruct the various frequencies from the interferogram to provide an accurate spectrum of the sample. Usually, an FTIR analyzer converts that information into properties or values though an integrated user interface, which can then be easily used for process monitoring or process control.

FTIR analyzers can use multiple sampling methods (accessories) depending of the materials type to analyze. Those methods can be used to identify unknown compounds (identify), to quantify trace-level chemicals (quantify), or to characterize the kinetic characteristics of a chemical reaction. FTIR analyzer is a well-known technology used for a long time in the academic sector but has also demonstrated its benefit in numerous industrial applications. For example, the ability to measure hot and wet gases is beneficial for emissions monitoring in facilities such as waste incineration plants.

Gas Analyzers from ABB


ABB offers a patented FTIR analyzer design featuring double-pivoted mirrors that eliminate outdated single-moving mirror architectures. This permanent aligned analyzer allows analysis with an increased level of accuracy previously impossible. Thanks to the improved performance, new technics of calibration are possible which reduced the commissioning efforts. ABB’s new ACF5000 is the specialist for emission and process monitoring from the pioneers in FTIR CEMS. It is available in the 4th generation. Since introduction in 1993, ABB has sold more than 2000 units. The standard system design combines the advantages of a FTIR spectrometer, flame ionization (FID) technology and oxygen measurement. The high resolution FTIR spectrometer provides selective measurement of infrared active gas molecules with high sensitivity and stability. It simultaneously measures up to 15 components including all relevant pollutants.

The MB3000-CH90 provides fast and accurate gas measurements in a laboratory environment. The Horizon software enables the use of commercial or personalized spectral libraries for unknown gas identification and the heatable gas cell is available for long or short pathlength applications.

ABB‘s tight manufacturing tolerances and specifications for analyzer-to-analyzer matching permit laboratory development of calibrations which are routinely transferred to ABB process instruments.


We offer one of the world’s largest portfolios of FTIR analyzers and solutions for industry, commercial and research applications. If you would like any more information about our original equipment, our intuitive FTIR software, or our unique product portfolio, please do not hesitate to contact us using the links below. 

  • Contact us

    Submit your inquiry and we will contact you

    Contact us