Fourier transform spectrometer free of movable mechanical part

Abstract

The invention relates to a fourier transform spectrometer free of a movable mechanical part. The spectrometer is characterized in that: a light source, a collimating lens, a polarizer, a polarization plane revolver, a polarization analyzer, a condensing lens, and a photodetector are successively installed on an optical path from the light source to the photodetector; the polarization plane revolver is composed of a transparent medium material, an annular ferromagnet, a solenoid, an alternating current power supply device, and a magnetic sensor, wherein the annular ferromagnet has a gap and a through hole; the medium material is at a gap position of the annulus; the solenoid is encircled on the annulus; power of the solenoid with electricity is supplied by the alternating current power supply device; the magnetic sensor is placed in the annulus and is used for detecting magnetic induction intensity; an incident light penetrates the medium material by the through hole in the annulus; a data collection system records data of light intensities of the photodetector and magnetic induction intensities of the magnetic sensor. According to the invention, the spectrometer provided in the invention does not contain a movable mechanical part; besides, the spectrometer has advantages of simple and stable structure, good repeatability, wide frequency band, multi-path performance and high flux; therefore, a reliable technological means can be provided for a high speed spectrum measurement.

Description

[0001] technical field [0002] The invention relates to a Fourier transform spectrometer based on Faraday's (Faraday) optical dispersion principle. The invention has special application in spectrum analysis and spectrum measurement, but can also be widely used in the fields of material structure analysis, optical absorption and reflection measurement, industrial process control such as high temperature measurement and gas composition analysis. [0003] Background technique [0004] Spectral analysis and spectral measurement is a research topic commonly involved in engineering technology and scientific research. The widely used spectral range is from ultraviolet, visible to infrared light bands. Spectrometers in the range of ultraviolet to visible light usually use grating and prism dispersion spectroscopic technology, while infrared spectrometers use grating, prism dispersion and Michelson interferometer technology. But using a set of grating system or dispersive beam-s...

AI Technical Summary

Problems solved by technology

Therefore, the existing spectrometers all contain movable mechanical parts, which reduces the mechanical reliability and stability of the instrument, prolongs the spectrum measurement time, and cannot perform high-speed measurement of the spectrum of transient light waves.

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