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Fast 3D chemical imaging method of atmospheric single particle based on stimulated Raman scattering

A technology for stimulated Raman scattering and atmospheric particulate matter, which is applied in Raman scattering, individual particle analysis, particle and sedimentation analysis, etc. It can solve the problems of difficult experimental operation, inability to quickly detect particle morphology, and complex sample preprocessing. Achieving the effect of high local concentration

Active Publication Date: 2021-10-26
FUDAN UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide a fast three-dimensional chemical imaging method for the analysis of atmospheric single particle chemical components, to solve the existing problems in the prior art, such as complicated sample pretreatment, difficult experimental operation, inability to quickly detect particle morphology and inability to give particle Technical Problems of 3D Structural Information

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  • Fast 3D chemical imaging method of atmospheric single particle based on stimulated Raman scattering
  • Fast 3D chemical imaging method of atmospheric single particle based on stimulated Raman scattering
  • Fast 3D chemical imaging method of atmospheric single particle based on stimulated Raman scattering

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Embodiment 1

[0034] The invention provides a method for rapid three-dimensional chemical imaging of atmospheric single particles based on stimulated Raman scattering. In two examples, self-constructed such as figure 1 Stimulated Raman scattering microscopy system shown. The femtosecond laser 1 has two output ports, one end 1-1 outputs a tunable wavelength of 680nm-1300nm as pump light, and the other end 1-2 outputs a fixed wavelength of 1040nm as Stokes light. The pump light and the Stokes light pass through the first SF57 dispersion glass 2-1 and the second SF57 dispersion glass 2-2 respectively to complete the linear chirp process, so that the femtosecond light is stretched into picosecond light, which is stimulated Raman Provide half height and full width of 15cm -1 spectral resolution. Next, the Stokes light is 0, 1 modulated by the electro-optic modulator 3, and the relative time delay between the pump light and the Stokes light is adjusted by the precision displacement stage 4, an...

Embodiment 2

[0038] A large number of experiments have shown that: compared with nitrate and sulfate, the composition of secondary organic aerosols in atmospheric particulate matter is messy and its proportion is low. Therefore, in this embodiment, only sodium nitrate and sodium sulfate are selected as the substances to be detected. In conjunction with Example 1, the fast three-dimensional chemical imaging method of sodium nitrate and sodium sulfate in atmospheric particulate matter comprises the following steps altogether:

[0039] S1. The experimental parameters of the respective Raman peaks in the stimulated Raman scattering microscope system are obtained from the standard substances of sodium nitrate and sodium sulfate. The parameters include: the fixed Stokes wavelength is 1040nm, and the optimally selected pump The wavelength is 942nm, and the corresponding relative time delays are 0ps and 1.33ps;

[0040] S2. First set up the two outputs of the laser, then set the relative time del...

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Abstract

The invention belongs to the technical field of nonlinear optical imaging, in particular to a rapid three-dimensional chemical imaging method of atmospheric single particles based on stimulated Raman scattering. The method of the present invention comprises: using a stimulated Raman scattering microscope system to detect the standard substance of the substance to be detected, and obtaining the specific parameters of the Raman peak position in the stimulated Raman system; setting the experimental parameters, and performing rapid x, y Axis two-dimensional imaging, so reciprocating, to obtain the image sequence along the z-axis direction; import the image sequence into the three-dimensional reconstruction software, use the size of the scanning field of view and the number of scanning pixels to calculate the actual size of each pixel, combined with z The axis scanning step is mapped to the initialization parameter setting of the three-dimensional reconstruction, so as to obtain the real three-dimensional structure information of the particles. The method of the invention can obtain the three-dimensional structure and specific component distribution information of atmospheric single particles in a short time. The invention does not require sample pretreatment, retains the most original state of the particles, and has simple experimental steps.

Description

technical field [0001] The invention belongs to the technical field of nonlinear optical imaging, and in particular relates to a rapid three-dimensional chemical imaging method for atmospheric single particles based on stimulated Raman scattering. Background technique [0002] Atmospheric particulate matter refers to all solid and liquid condensates dispersed in the atmosphere. Among them, particulate matter with an aerodynamic particle size of less than 10 μm can float in the atmosphere for a long time, and due to its small size, it is easy to be inhaled into the human respiratory tract and cause various health diseases. At the same time, these particles can absorb and scatter solar radiation, and can also act as crystal nuclei to induce cloud condensation, which is inextricably linked to climate change. Therefore, it is very important to study the physical and chemical properties of atmospheric single particles. [0003] Compared with the sample average level provided by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65G01N21/17G01N15/14G01J3/44G01J3/28
CPCG01N21/65G01N21/17G01N15/14G01J3/44G01J3/2823G01N2021/655G01N2021/1785G01N2015/1445
Inventor 季敏标张立武敖建鹏冯亦青吴思敏
Owner FUDAN UNIV
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