Near-infrared polarization interferometer spectrometer

Abstract

The invention relates to a near-infrared polarization interferometer spectrometer. The near-infrared polarization interferometer spectrometer comprises a light source group, a collimation off-axis parabolic mirror, a first cold light mirror, a polarizing prism, a compensation crystal, a scanning optical wedge component, an analyzing prism, a second cold light mirror, a convergence off-axis parabolic mirror and a detector which are arranged in sequence in the light-path direction. The light source group comprises a halogen tungsten lamp which carries out direct coupling output through a single mode fiber and a He-Ne laser device for sending a calibration light source. The detector comprises a silicon detector and an InGaAs detector. The near-infrared polarization interferometer spectrometer is simple in structure.

Description

technical field [0001] The invention belongs to the field of optical instruments and relates to near-infrared spectrum technology, in particular to a near-infrared polarization interference spectrometer. Background technique [0002] The near-infrared spectrum (780-2526nm) is generated when the molecular vibration transitions from the ground state to a high energy level due to the non-resonant nature of the molecular vibration. The double frequency and combined frequency absorption of different groups or the same group in different chemical environments have obvious differences in the near-infrared absorption wavelength and intensity, so the near-infrared spectrum contains a wealth of material structure and composition information. Through the organic combination of near-infrared spectrometers, chemometric software and calculation models, substances (including solid, liquid and gas) can be quantitatively tested and analyzed quickly and accurately. The core of near-infrared ...

AI Technical Summary

Problems solved by technology

Michelson interferometric spectrometer technology is mature and has the advantages of high throughput and high resolution. However, the Michelson interferometer is very sensitive to external vibrations due to its dual-branch structure and the existence of a moving plane mirror, and the requirements for the use environment are too harsh. It is necessary to take a lot of anti-shock measures in the structural design, which makes the whole system too large and complex, so the price is expensive, and the maintenance and use costs are also very high, which is not conducive to the large-scale application of near-infrared spectral analysis technology in process control and online measurement

Due to the existence of slits in the grating spectrometer, the luminous flux is insufficient

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