Fourier near-infrared spectrum interferometer and instrument for online material detection

Abstract

The invention belongs to the technical field of spectral analysis instruments, and discloses a Fourier near-infrared spectrum interferometer and an instrument for online material detection. The interferometer is provided with angle mirror and plane mirror pairs; the angle mirror and plane mirror pairs are located on light paths of a movable mirror and a fixed mirror; after being subjected to beamsplitting, first light rays irradiate a rotating mirror, then are reflected to a hollow angle; the first light rays are reflected by the hollow angle mirror and horizontally move to the rotating mirror, then are reflected to a first plane mirror of an isosceles prism, and return along the same path after being reflected by the first plane mirror; after being subjected to beam splitting, second light rays are reflected by the angle mirror, and horizontally move to a second plane mirror; and the second light rays are reflected by the second plane mirror and returned along the same path; the rotating mirror rotates to generate optical path change scanning. The double-angle mirror and double-plane mirror interferometer light path scheme is adopted, so that the sensitivity of the interferometerto vibration and temperature can be remarkably reduced. The interferometer is particularly suitable for near-infrared spectrum analysis, especially online near-infrared spectrum analysis.

Description

technical field [0001] The invention belongs to the technical field of spectral analysis instruments, in particular to a Fourier near-infrared spectral interferometer and an instrument for on-line material detection. Background technique [0002] At present, after the 1980s, with the rapid development of computer technology, the digitalization of analytical instruments and the development of the discipline of chemometrics have been driven. Chemometric methods have achieved good results in solving spectral information extraction and background interference. The unique characteristics of infrared spectroscopy, such as fast analysis speed, high analysis efficiency, and low analysis cost, have made people re-understand the value of near-infrared spectroscopy. It has become the fastest-growing and most eye-catching spectral analysis technology since the 1990s. The organic combination of technology and chemometrics is known as the giant of analysis. [0003] Unlike the mid-infrar...

AI Technical Summary

Problems solved by technology

For instruments produced according to this optical path, temperature changes or vibrations during storage may cause M1 and M2 to deviate from parallelism, reducing the interference modulation degree of the interferometer. Not only the detected spectral signal becomes smaller, but also because The measurement error caused by the deflection of the plane mirror has a greater impact on high frequency (short wavelength), and the measured spectral curve will be distorted, which will affect the stability of the instrument

[0014] To sum up, the existing problems in the prior art are: the existing Fourier transform instruments have stability problems when they are used for rapid online measurement.

In the near-infrared application of Fourier transform spectrometer, two points are required: fast measurement speed and stable instrument performance, and these two requirements are contradictory in the existing instrument scheme, and it is difficult to balance them

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