Raman spectral enhancement system and enhancement method based on photonic crystal fiber resonant cavity

Abstract

The invention discloses a Raman spectral enhancement system and enhancement method based on a photonic crystal fiber resonant cavity and an enhancement method. The Raman spectral enhancement system is constructed by sequential serial connection of a pumping light source, a coupled focusing lens, a laser resonant cavity, an optical fiber connector A, a photonic crystal fiber resonant cavity, an optical fiber connector B, a third fiber Bragg grating FBG3, a photoelectric acquisition unit and a computer processing system. The Raman spectral enhancement system and enhancement method have the advantages that (1) enhancement of Raman spectral signals during real-time online monitoring of gaseous substance components is realized, Raman light is enhanced and the influence of stray light on the Raman light is lowered at the same time through the photonic crystal optical fiber resonant cavity, and the sensitivity in a detection application is further enhanced; (2) the system can be applied to enhancement of the Raman spectral signals during real-time online monitoring of gaseous substance components with a Raman spectrometer, so that accurate, quantitative and qualitative analysis can be performed on a sample to be tested through online Raman spectra under the situation of low sample concentration.

Description

technical field

[0001] The invention relates to a Raman spectrum enhancement system and enhancement method based on a photonic crystal fiber resonator, which is used to enhance the Raman spectrum effect of a Raman spectrometer when gas is detected online, thereby improving the sensitivity of the Raman spectrometer and making it Accurate qualitative and quantitative analysis is carried out during the detection process. It belongs to the field of optoelectronic technology. Background technique

[0002] Raman spectroscopy is an analytical technique developed on the basis of the Raman scattering effect. Because its peak area, frequency shift, line width, and number of characteristic peaks are closely related to the structure and concentration of molecules, it has become a qualitative and quantitative method for substances. Analytical as the main tool and widely used. The timeliness and accuracy of Raman online instruments make it widely used in the qualitative and quantitative...

Examples

Embodiment

[0022] see figure 1 , the LD pumping laser diode with a wavelength of 808nm is selected to provide a light source for subsequent Raman detection. The laser frequency conversion part includes: excitation crystal, frequency doubling crystal and conduction fiber. After the light source generates excitation light, the light is focused into the excitation crystal through the focusing lens, and the 532nm green light is obtained through the frequency doubling crystal.

[0023] In order to avoid the center frequency drift of the laser due to temperature changes, the temperature control system is used to control the temperature of the laser diode, excitation crystal and frequency doubling crystal. When the temperature is too high, the cooling plate starts to work, and its temperature is controlled not to exceed a specific range. At the same time, the laser power can be adjusted by adjusting the temperature and angle of the frequency doubling crystal and the excitation crystal.

[0024...

technical field

[0001] The invention relates to a Raman spectrum enhancement system and enhancement method based on a photonic crystal fiber resonator, which is used to enhance the Raman spectrum effect of a Raman spectrometer when gas is detected online, thereby improving the sensitivity of the Raman spectrometer and making it Accurate qualitative and quantitative analysis is carried out during the detection process. It belongs to the field of optoelectronic technology. Background technique

[0002] Raman spectroscopy is an analytical technique developed on the basis of the Raman scattering effect. Because its peak area, frequency shift, line width, and number of characteristic peaks are closely related to the structure and concentration of molecules, it has become a qualitative and quantitative method for substances. Analytical as the main tool and widely used. The timeliness and accuracy of Raman online instruments make it widely used in the qualitative and quantitative...

Examples

Embodiment

[0022] see figure 1 , the LD pumping laser diode with a wavelength of 808nm is selected to provide a light source for subsequent Raman detection. The laser frequency conversion part includes: excitation crystal, frequency doubling crystal and conduction fiber. After the light source generates excitation light, the light is focused into the excitation crystal through the focusing lens, and the 532nm green light is obtained through the frequency doubling crystal.

[0023] In order to avoid the center frequency drift of the laser due to temperature changes, the temperature control system is used to control the temperature of the laser diode, excitation crystal and frequency doubling crystal. When the temperature is too high, the cooling plate starts to work, and its temperature is controlled not to exceed a specific range. At the same time, the laser power can be adjusted by adjusting the temperature and angle of the frequency doubling crystal and the excitation crystal.

[0024...

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