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Past and present of laser-induced breakdown spectroscopy
Release time: 2019-02-28 15:51:27 Click: 3589
Laser-induced breakdown spectroscopy is not a new analytical method. Its predecessor can be traced back to the 10th International Spectroscopy Conference in 1962. Laser Induced Breakdown Spectroscopy (LIBS), abbreviated as LIBS, was proposed and implemented in 1962 by the David Cremers research team at Los Alamos National Laboratory in the United States. Since the group member Brech first proposed a spectrochemical method using a ruby microwave laser to induce plasma generation in 1962, laser-induced breakdown spectroscopy has begun to be widely used in many fields, such as online analysis of steel components, the universe Exploration, environment and waste monitoring, cultural heritage identification, industrial process control, medical testing, geochemical analysis, and NASA's Mars Exploration Program CHEMCAM, etc., and has developed many miniaturized online detection systems based on LIBS technology.
2, the basic principle of LIBS
The excitation method of LIBS determines that it can directly analyze samples in various states, including gas, liquid and solid. Any element will be excited by such a high energy density laser, so it can analyze all elements. LIBS's analysis wavelength range and nickname actually depend only on the optical system and detector it is equipped with. In addition, technically, LIBS is similar to other spectra that use lasers as excitation sources, such as excited Raman spectra, laser-induced fluorescence spectra, and so on. Many of these spectrometers have the same hardware. Attempts have been made to integrate these analysis and atomic spectroscopy techniques to obtain more detailed and in-depth composition and structure information of the samples.
Due to the use of optical fibers to achieve the transmission of excitation light and emitted light, analysis that cannot be achieved by XRF can be performed through optical fibers, such as direct detection of nuclear facilities, heavily polluted areas, etc., and in-situ detection of subsurface soil layers.
4. Laser-induced breakdown spectrometer experimental device The laser-induced breakdown spectrum experimental device system is mainly composed of a laser, a vacuum chamber, a spectrometer, and a PC.
Metal material inspection: Compared with XRF and emission spectroscopy, LIBS has many advantages. It is an important means to achieve on-site inspection of metal materials under various environmental conditions. It can quickly provide qualitative and quantitative analysis of various mixed metal products. With the continuous improvement of the portable LIBS system and further analysis of its performance, it is expected to become the mainstream equipment for on-site metal material inspection.
Creators latest handheld laser-induced spectrometer6. Summary With the advancement of laser and related technologies, LIBS will become a routine device in the field of field analysis.
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