Electrostatic assistance enhanced LIBS (laser induced breakdown spectroscopy) device for detecting heavy metal elements in sewage
A laser-induced breakdown and assisted enhancement technology, applied in thermal excitation analysis, material excitation analysis, etc., can solve problems such as poor detection accuracy, high detection limit, and instability
Inactive Publication Date: 2015-11-18
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
LIBS technology is a new detection technology for heavy metal elements in sewage, but traditional LIBS technology still has defects such as high detection limit and poor detection accuracy. In order to solve the problem of weak and unstable LIBS spectral signal of liquid matrix, this invention proposes An electrostatically assisted enhanced laser-induced breakdown spectrum sewage heavy metal element detection device, which can increase the spectral signal intensity of the measured elements in sewage, reduce the detection limit, and improve detection sensitivity
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[0019] like figure 1 , figure 2 , image 3 As shown, it is an electrostatically assisted enhanced laser-induced breakdown spectrum sewage heavy metal element detection device, including a laser induction unit composed of a Nd:YAG laser 1, a half-wave plate 2, a Glan prism 3 and a focusing lens 4; the focusing lens 10, The spectrum detection unit composed of the spectrometer 11 and the computer 12, compared with the traditional LIBS detection device of the present invention, is characterized in that an electrostatic auxiliary enhanced spectrum signal unit is added.
[0020] The electrostatically assisted enhanced spectrum signal unit in the present invention includes a positive plate 7, a negative plate 8, a capacitor C, and a resistor R 1 , R 2 and high voltage power supply9.
[0021] The positive plate 7 and the negative plate 8 are copper plates with a side length of 50mm×50mm×3mm, the distance between the plates is 4cm~5cm, and the current limiting resistor R 1 30MΩ, ...
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The invention belongs to the technical field of LIBS (laser induced breakdown spectroscopy) detection, and particularly provides an electrostatic assistance enhanced LIBS device for detecting heavy metal elements in sewage. The electrostatic assistance enhanced LIBS device comprises an incidence unit, a spectral signal receiving unit, a sewage flow velocity control unit and a data analysis unit, wherein the incidence unit comprises a YAG laser, an energy attenuation system and lenses; the spectral signal receiving unit comprises a probe, an optical fiber and a spectrometer. Compared with the traditional LIBS device, an electrostatic assistance enhanced LIBS spectral signal unit and a peristaltic pump are added to control the sewage flow velocity control unit, the intensity of acquired LIBS spectral signals is about two times higher than that of the traditional LIBS spectral signals, and the detection sensitivity is increased by two times; the electrostatic assistance enhanced LIBS device not only has the advantages of rapidness, online and in-situ detection and the like of the traditional LIBS, but also has the characteristic of improvement of the intensity of the LIBS spectral signals, compared with a DP-LIBS (dual pulse laser Induced breakdown spectroscopy) technology, the detection system adopts simple equipment, the operation is easy, the cost of a laser system and the complexity of an optical system are reduced, and the device has higher practicability.
Description
technical field [0001] The invention relates to an electrostatically assisted enhanced laser-induced breakdown spectrum detection device for heavy metal elements in sewage, belonging to the technical field of plasma spectrum detection, and its application fields include sewage heavy metal monitoring, soil heavy metal pollution element measurement, plastic pollution classification and other analysis categories. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS) is an emerging photochemical analysis technology for material components. Compared with other detection methods, LIBS technology has many advantages such as online, in situ, fast and non-contact without pretreatment of samples. The advantage of simultaneous analysis of elements. At present, it has important application value in industries such as agriculture, aerospace and material chemical industry, so it has attracted more and more people's attention. [0003] LIBS technology can effectively d...
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Inventor 高勋张亚维林景全
Owner CHANGCHUN UNIV OF SCI & TECH