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The past and present of laser induced breakdown spectroscopy
Release time: 2019-02-28 15:51:27 Click: 3895
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 (Laser Induced Breakdown Spectroscopy), referred to as LIBS for short, was proposed and implemented by the David Cremers research team of Los Alamos National Laboratory in the United States in 1962. Since the team member Brech first proposed the spectrochemical method of using a ruby microwave laser to induce plasma generation in 1962, laser induced breakdown spectroscopy technology has been widely used in many fields, such as online analysis of steel components, 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 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 under such high energy density laser irradiation, so it can analyze all elements. The analysis wavelength range and nickname of LIBS actually only depend on the optical system and detectors configured. In addition, technically speaking, LIBS is similar to other spectra that use laser as an excitation source, such as excited Raman spectroscopy, laser-induced fluorescence spectroscopy, etc. Many of the hardware of these spectrometers are the same, and we have now tried to integrate these analysis and atomic spectroscopy techniques to obtain more detailed and in-depth composition and structural information of the samples.
Due to the use of optical fibers for the transmission of excitation light and emitted light, analysis that cannot be achieved by XRF can be performed through optical fibers, such as direct and long-distance detection of nuclear facilities, heavily polluted areas, and in-situ detection of soil subsurface layers.
4. Laser induced breakdown spectrometer experimental device The laser induced breakdown spectrometer experimental device system is mainly composed of laser, vacuum chamber, spectrometer and PC.
Metal material inspection: LIBS has many advantages compared with XRF and emission spectroscopy. It is an important means to realize 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 performance, it is expected to become the mainstream equipment for on-site metal material inspection.
Chuangxiang's latest handheld laser-induced spectrometer6. Summary With the advancement of laser and related technologies, LIBS will surely become a routine equipment in the field analysis field.