A portable FTIR (Fourier Transform Infrared) gas analyzer is a compact and portable instrument used for the real-time analysis and identification of gases in various applications. It utilizes FTIR spectroscopy, which is a technique that uses infrared light to measure the absorption of specific wavelengths by gas molecules.

Here are some key features and components of a portable FTIR gas analyzer:

1. Fourier Transform Infrared Spectrometer: The heart of the analyzer is the FTIR spectrometer. It consists of an infrared light source, an interferometer, a beam splitter, and a detector. The interferometer splits the incoming infrared light into two beams, one passing through the gas sample and the other through a reference path. After interacting with the sample, the beams are recombined, and the resulting interference pattern is measured by the detector.
2. Gas Sampling System: The analyzer is equipped with a gas sampling system to extract a representative sample of the gas to be analyzed. It typically includes sample probes, filters, and a sample cell or gas cell where the gas interacts with the infrared light. The gas cell is designed to optimize the path length and interaction between the gas sample and the infrared light.
3. Optics and Mirrors: The analyzer incorporates high-quality optics, including mirrors and lenses, to direct and focus the infrared light onto the gas sample and then onto the detector. These optics are designed to minimize losses and maximize the sensitivity and accuracy of the measurements.
4. Data Processing and Software: Portable FTIR gas analyzers are equipped with built-in data processing capabilities and software algorithms to analyze the measured spectra and identify the gases present in the sample. The software may include libraries of reference spectra for comparison and identification of different gases.
5. Display and User Interface: The analyzer usually has a built-in display unit and a user-friendly interface for real-time monitoring and data visualization. It allows users to view gas concentrations, spectra, and other relevant information.

Portable FTIR gas analyzers are used in a wide range of applications, including environmental monitoring, industrial hygiene, workplace safety, emissions monitoring, and leak detection. They provide fast and accurate identification and quantification of gases, enabling users to assess air quality, detect pollutant sources, and ensure compliance with regulatory standards.