Fourier transformation spectrometer

Abstract

The invention discloses a Fourier transformation spectrometer, which comprises a mach-zehnder structure. The mach-zehnder structure comprises a first optical fiber coupler for inputting optical signals, a second optical fiber coupler for outputting optical signals and two optical fiber arms connected between the two optical fiber couplers. At least one input port for inputting a to-be-measured signal is arranged on the first optical fiber coupler. A signal output port is formed in the second optical fiber coupler. One of the two optical fiber arms is a D-shaped optical fiber. The mach-zehnderstructure further comprises a heating device which corresponds to the D-shaped optical fiber. The heating device is used for heating the D-shaped optical fiber to enable the D-shaped optical fiber toexpand and extend, so that the optical path difference between the D-shaped optical fiber and the other optical fiber arm is improved. Based on the thermal expansion characteristic of optical fibers,the adjustment of the optical path difference between the two optical fiber arms is realized. Not only the scanning resolution of the Fourier transformation spectrometer is improved, but also the stability of the scanning effect of the Fourier transformation spectrometer is better.

Description

technical field [0001] The invention relates to the field of spectrometer devices, in particular to a Fourier transform spectrometer. Background technique [0002] Fourier transform spectrometer is an instrument that uses Fourier transform spectroscopy to analyze the absorption and emission spectra of material atoms and molecules. To obtain the spectrogram, and then obtain the required spectral information, the traditional Fourier transform spectrometer needs to use moving parts to coordinate and adjust to improve the resolution of the scanned image, and the optical beam splitter of the traditional Fourier transform spectrometer is easily affected by environmental vibrations , temperature is easy to cause phase error and intensity error. For this situation, a fiber-optic Fourier transform spectrometer based on Mach-Zehnder interferometer has appeared, which uses optical fiber and fiber coupler to replace the traditional optical path and beam splitter respectively. By changin...

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Problems solved by technology

[0002] Fourier transform spectrometer is an instrument that uses Fourier transform spectroscopy to analyze the absorption and emission spectra of material atoms and molecules. To obtain the spectrogram, and then obtain the required spectral information, the traditional Fourier transform spectrometer needs to use moving parts to coordinate and adjust to improve the resolution of the scanned image, and the optical beam splitter of the traditional Fourier transform spectrometer is easily affected by environmental vibrations , temperature is easy to cause phase error and intensity error. For this situation, a fiber-optic Fourier transform spectrometer based on Mach-Zehnder interferometer has appeared, which uses optical fiber and fiber coupler to replace the traditional optical path and beam splitter respectively. By changing the length of the optical fiber To replace the traditional moving mirror to realize the scanning of the optical path difference, since the resolution of the Fourier transform spectrometer is mainly determined by the optical path difference between the two fiber arms of the Mach-Zehnder interferometer, it is necessary to improve the resolution of the spectrometer The optical path difference between the two fiber arms, and the current method of adjusting the length of the fiber arm of the spectrometer is relatively simple and mostly adopts the method of physical stretching, and it is easy to increase the volume of the whole machine

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