Analysis of the Principle of Fourier Transform Technology

The oil infrared spectrometer adopts Fourier transform (FTIR) technology, which is based on dividing the infrared light emitted by the light source into two beams through an interferometer. One beam is fixed, and the other beam changes its path length through a moving mirror, resulting in interference phenomenon. These two beams of light recombine at the detector to form an interference pattern. The interference pattern contains rich sample information, and then the Fourier transform algorithm is used to convert the interference signal in the time domain into spectral information in the frequency domain, thereby generating an infrared absorption spectrum. This technology does not require the spectroscopic steps in traditional spectroscopic analysis, improving analysis efficiency and sensitivity.

Spectral Resolution Enhancement Strategy

Adopting high-precision spectroscopic instruments: using a high-resolution Fourier transform infrared spectrometer, which itself has higher spectral resolution capability.

Optimize interferometer design: The interferometer is the core component of the FTIR system, and by optimizing the material of the beam splitter and the movement distance of the moving mirror, the spectral resolution can be improved. For example, using potassium bromide or cesium iodide with good transparency to mid infrared light as the material for the beam splitter.

Adjusting the slit width: For some dispersion type components, reducing the slit width can capture a narrower band and improve resolution, but attention should be paid to avoiding a sharp decrease in energy and sensitivity caused by a narrow slit.

Adopting advanced algorithms: utilizing Fourier transform spectroscopy and other advanced algorithms to further improve spectral resolution during data processing.

System integration and optimization: Combining high-precision detectors and stable control systems to ensure accurate acquisition and processing of spectral data, thereby comprehensively improving spectral resolution.