The Fourier transform infrared spectrometer is an infrared spectrometer, which is different from the principle of dispersive infrared spectroscopy, and is developed based on the principle of Fourier transform of infrared light after interference. It is mainly composed of an infrared light source, a diaphragm, an interferometer, a sample chamber, a detector, and various infrared mirrors, lasers, control circuit boards, and power supplies. It can carry out qualitative and quantitative analysis of samples, and is widely used in pharmaceutical and chemical industry, geology and mining, petroleum, coal, environmental protection, customs, gemstone identification, criminal investigation and identification. 
Fourier transform infrared spectroscopy is mainly used to measure the absorption of infrared by substances, and is widely used to characterize the molecular structure and chemical bonds of materials. It can be divided into three regions: near-infrared, mid-infrared and far-infrared, of which the near-infrared region is quantitatively analyzed and patterned by stoichiometry, the mid-infrared region is used to determine the presence and type of functional groups, and the far-infrared region is used to study the vibrational mode of macromolecules. 
The use of FTIR spectroscopy requires professional and formal operator training, and a senior technician is recommended to demonstrate it on site. At the same time, it is necessary to pay attention to the test requirements of the target sample, and the surface of the sample should be smooth and clean to avoid interference from other elements. Attention is also needed to see if the detected samples meet the requirements. In summary, FTIR spectrometers are widely used in a variety of fields, including chemistry, materials, environment, etc., which require professional operation training, attention to sample testing requirements, and attention to the accuracy and reliability of test results.