Optical excitation fluorescent spectra system having no requirement of stability of excitation light source

Abstract

The invention relates to an optical excitation fluorescent spectra system having no requirement of stability of excitation light source, which comprises a light source, a spectrometer, an exciting light converging element, a beam splitter, a light intensity meter, a sample, an emitted light collecting element, an emission spectrometer, a detector and a computer, wherein the spectrometer is arranged behind the light source and used for dispersing a broad-spectrum optical signal sent by the light source into a narrowband light source or monochromatic source, the exciting light converging element is arranged behind the spectrometer and used for converging exciting light emitted by the spectrometer on a sample to be tested, the beam splitter is arranged behind the exciting light converging element and used for reflecting part of the exciting light emitted by the spectrometer to another direction to enter a light intensity meter, the light intensity meter is arranged at one side of the light path of the beam splitter and used for detecting the intensity of the exciting light reflected by the beam splitter and using the intensity as a reference light intensity, the sample is arranged behind the beam splitter, the emitted light collecting element is arranged behind the sample and used for converging the signal light emitted by the sample to an inlet of the emission spectrometer, the emission spectrometer is arranged behind the emitted light collecting element and used for dispersing the signal light to a the detector, the detector is arranged behind the emission spectrometer and used for detecting the intensity of a spectral signal dispersed by the emission spectrometer, and the computer is respectively connected with the spectrometer, the light intensity meter, the emission spectrometer and the detector and used for controlling the running of the whole system.

Description

technical field [0001] The invention relates to the technical field of spectral analysis, in particular to the testing technology related to the excitation spectrum and light-excited fluorescence spectrum of materials. Background technique [0002] Excitation spectrum and light-excited fluorescence spectrum are very important spectral properties of condensed matter, which are mainly used to study the luminescent center, energy level position and luminous efficiency of the material. [0003] The current simple photoexcited fluorescence spectroscopy system is mainly composed of a light source, an excitation spectroscopy system, a sample chamber, an emission spectroscopy system and a detector. Usually, when using such a system to test the excitation spectrum and light-excited fluorescence spectrum, a reflector is placed in the sample chamber first, so that the monochromatic light separated by the excitation spectroscopic system directly enters the emission spectroscopic system ...

AI Technical Summary

Problems solved by technology

This conventional test method has two defects: one is that the excitation spectrum curve is measured by the emission spectrometer, and the real excitation spectrum curve must be corrected to obtain after the response curve of the emission spectrometer, and the different gratings and different slit widths of the emission spectrometer Factors such as the detector and the detector used have an impact on the response curve of the emission spectrometer, so it is very difficult to obtain the real excitation spectrum curve; second, the two-time measurement method requires repeated use of the spectrometer, the repeatability of the spectrometer operation and the stability of the excitation light source will question the reliability of the correction of the spectra measured in the two time periods, which also puts high demands on the stability of the light source power supply

If the repeatability of the instrument is poor or the stability of the light source power supply is poor, it will affect the test results

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