ftir spectrometer

NegotiableUpdate on 01/19

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Overview

FTIR spectrometer, also known as Fourier transform infrared spectrometer, is an advanced analytical instrument based on the principle of interference, which uses Fourier mathematical transformation to convert the original interferogram signal into infrared spectrum. It is widely used in fields such as chemistry, materials science, biomedicine, environmental monitoring, food industry, and pharmaceuticals, and is an important tool for material structure analysis and component identification.

Product Details

The core principle of FTIR is the Michelson interferometer. The instrument contains a beam splitter, a fixed reflector, and a movable reflector inside. When the infrared light source emits light onto the beam splitter, the beam is split into two paths: one towards the fixed mirror and the other towards the moving mirror. After reflection, the two beams of light converge again, causing interference and forming an interference pattern signal (i.e. interference pattern) that changes with the position of the moving mirror. This signal contains information on all infrared frequencies. When the sample is placed in the optical path, its molecules absorb specific wavelengths of infrared light, leaving characteristic information in the interferogram. Computers convert complex time-domain interferograms into frequency-domain infrared absorption spectra through Fourier transform, which are commonly known as spectra of transmittance or absorbance varying with wave number (cm ⁻¹).

Compared with traditional dispersive infrared spectrometers, FTIR has several significant advantages. Firstly, it has a high signal-to-noise ratio (Fellgett advantage), as it simultaneously collects information from all frequencies, resulting in high measurement efficiency and a significant improvement in signal-to-noise ratio. Secondly, it has high resolution and wide spectral range, which can accurately distinguish adjacent absorption peaks and is suitable for the analysis of complex mixtures. The third advantage is high wavenumber accuracy (Connes advantage), thanks to the precise control of laser interferometers, good wavenumber repeatability, and ease of database comparison. In addition, FTIR has a fast response speed and is suitable for real-time monitoring and kinetic research.

FTIR can be equipped with multiple sampling accessories to accommodate different types of samples. Common ones include:

Transmission method: suitable for liquid, film or KBr pressed solid samples;

Attenuated total reflection (ATR): it can directly test solid, gel or viscous liquid without complex pre-processing, and is currently a commonly used sampling method;

Diffuse Reflectance (DRIFT): Used for powder or rough surface samples;

Gas pool: used for analyzing gas composition.

In terms of application, FTIR can be used for functional group identification, molecular structure analysis, unknown component analysis, reaction process monitoring, material aging research, etc. For example, in polymer research, the type of polymer can be determined by characteristic peaks; In the pharmaceutical industry, it is used for the authenticity identification and quality control of active pharmaceutical ingredients; In environmental science, detecting atmospheric pollutants or organic matter in water bodies.

In short, FTIR spectrometer has become an indispensable analytical equipment in modern laboratories due to its high sensitivity, high resolution, rapid analysis, and multifunctionality. With the advancement of technology, the development of miniaturization, intelligence, and combined technologies (such as thermal analysis or gas chromatography) will further expand their application prospects.