A method for analyzing the chemical composition of a single suspended particle using an analysis device

Abstract

The invention discloses a device for chemical composition analysis of single suspended particles, which includes a pulse laser, a hollow beam capturing particle system, an atomic emission spectrum collection system, a Raman spectrum collection system and an imaging system; a hollow beam capturing particle system It includes a continuous laser, a hollow beam generating device, a beam expansion collimation device, a high-reflection mirror, a first converging lens and a sample cell. Sample particles are arranged in the sample cell; the atomic emission spectrum collection system includes a first coupling lens and a laser-induced breakdown spectrometer. ; The Raman spectrum collection system includes a second coupling lens and a Raman spectrometer. In addition, the present invention also provides a method for analyzing the chemical composition of individual suspended particles using the above device. The invention uses a hollow beam to capture sample particles and uses a pulse laser to ionize the sample particles, collects atomic emission spectrum information and Raman spectrum information of the sample particles, and realizes in-situ analysis of the elemental composition and material composition of a single suspended particle.

Description

technical field [0001] The invention belongs to the application field of nonlinear optics, and in particular relates to a method for analyzing the chemical composition of a single suspended particle by using an analysis device. Background technique [0002] At present, the detection methods for particulate matter in the air include: infrared absorption spectroscopy, ultraviolet absorption spectroscopy, ultraviolet fluorescence method, chemiluminescence method, turbidity method and scattering method, etc. black, trace heavy metals, etc.) to detect the composition and structure. As an emerging in-situ measurement technology, laser-induced breakdown spectroscopy can analyze not only solid samples, but also liquid and gaseous samples. Analysis has been successfully used in many fields such as materials, metallurgy, combustion, environment, archaeology, space exploration, medicine and military affairs. [0003] Laser-Induced Breakdown Spectroscopy (LIBS) uses the plasma generat...

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Problems solved by technology

[0005] At present, no real-time in-situ analysis method for the composition of particles in the air has been reported. There are two main reasons for this: the currently known detection methods cannot analyze the chemical composition of particles in fluids (such as air); The laser capture technology has not yet been organically combined with the spectral analysis system

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