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Spectrum detection system and detection method for single-particle aerosol detection

A technology of spectral detection and detection method, which is applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of difficult laser focus convergence and increase the difficulty of LIBS detection experiments.

Pending Publication Date: 2021-07-16
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

In the actual LIBS detection experiment, the solid aerosol particles are separated and detected in the vacuum chamber. However, because the solid aerosol moves freely in the vacuum chamber, the uncertainty of its position makes it difficult to focus the laser on the On the sample, it greatly increases the difficulty of the LIBS detection experiment

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  • Spectrum detection system and detection method for single-particle aerosol detection
  • Spectrum detection system and detection method for single-particle aerosol detection
  • Spectrum detection system and detection method for single-particle aerosol detection

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] The invention adopts the LIBS technology to detect the aerosol particles. In the LIBS experiment, the separated single-particle aerosol particles are detected. Since the aerosol particles do not exhibit electricity, they are only affected by gravity in the vacuum chamber. Therefore, first use the electron gun to emit electrons to the single-particle aerosol, so that it is negatively charged, and then the force on it can be controlled through the electric field.

[0036] like figure 1 As shown, the spectral detection system of the present invention is composed of an aerosol particle trapping device and a laser-induced breakdown spectrometer. The laser-induced breakdown spectrometer emits laser light from the laser 16, and after being reflected by the plane mirror 17, it shoots into the aerosol particle confinement device. The aerosol particle confinement dev...

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Abstract

The invention discloses a spectrum detection system for single-particle aerosol detection, which comprises an aerosol single-particle trapping device for trapping aerosol particles at fixed positions in a vacuum chamber; and a laser-induced breakdown spectrometer for carrying out laser-induced breakdown spectroscopy detection analysis on the fixed aerosol particles. By utilizing the aerosol particle trapping device, a single aerosol particle can be effectively trapped at a fixed position in the vacuum chamber, so that the aerosol particle is accurately irradiated by LIBS (Laser-induced Breakdown Spectroscopy) laser, and components of the aerosol particle are detected. The device is combined with an LIBS (Laser-induced Breakdown Spectroscopy) detection device to form a complete system, so that an experiment for detecting solid aerosol particles in the atmosphere by an LIBS technology can be smoothly carried out.

Description

technical field [0001] The invention relates to an electron emission technology, in particular to a compound electric field trapping charged particle technology and a laser-induced breakdown spectrum detection technology. Background technique [0002] For a long time, with the development of industry and the advancement of science and technology, the problem of air pollution has become increasingly serious. Aerosol refers to a gaseous dispersion system composed of solid or liquid particles suspended in a gaseous medium, and is a relatively serious pollutant in the atmosphere. Therefore, rapid component detection of aerosols is crucial. [0003] Laser-induced breakdown spectroscopy (LIBS) is a highly sensitive detection technique. It uses a lens to focus high-energy laser pulses and irradiates the sample, generating high-temperature plasma in an instant. The chemical composition of the detected sample can be known by collecting the spectra of these plasmas with a spectrome...

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Application Information

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IPC IPC(8): G01N21/71G01N21/01
CPCG01N21/01G01N21/71
Inventor 俞文杰刘玉柱孙仲谋杨明磊万恩来张兴龙于玮葛一凡
Owner NANJING UNIV OF INFORMATION SCI & TECH
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