激光诱导击穿光谱的环形扫描探测与元素分布分析

doi:10.3964/j.issn.1000-0593(2020)06-1947-05

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Abstract Laser-induced breakdown spectroscopy (LIBS) is a rapid method for elemental analysis with significant advantages of sample-less, in situ, non-contact, multi-element detection, etc., and it has been widely applied in many research fields. In this work, LIBS was employed to develop a system for circular scanning, which can obtain the location of the high concentration region of elements according to the distribution acquired from the detection results of scanning. Based on this, an effective, fast and real-time method was provided for environmental anomaly monitoring, pollution source tracking and even mineral exploration. A simple structure was brought in that system to enable 360-degree scanning via rotating optics, not moving the entire system. The position or the orientation of the high concentration region (source) could be tracked by referencing the element distribution, which is related to the signal intensity of LIBS detection. In order to verify the concept of LIBS circular scanning and to evaluate the detectability of the system, seawater fog rich in elements of potassium, calcium, sodium, magnesium was used for the sample to simulate the source eruption. And detection of 360-degree scanning was carried out to evaluate the detection response with an interval of 10 degrees. Experimental results showed that the source position or orientation could be found accurately by following elements distribution, while necessary calibration was required to correct the detection result. The correction procedure includes two aspects: correction of fluctuant data and detection efficiency. The former is used to reduce the signal instability in the process of LIBS detection, mainly through the selection of internal reference elements to modify the signal fluctuation. The latter aims to reduce the errors in the detection process resulting from the installation and debugging and modify the acquisition efficiency of each scanning position according to the detection results in the even atmosphere. The corrected annular scanning data showed that the system could accurately obtain the location of “eruption source” with a large scanning radius (250 and 300 mm). In addition, the exact orientation of the area with a high concentration of elements can be found at a distance from the eruption location with a short scanning radius (100 mm). Therefore, it is suggested that LIBS could be functioning as a “radar” for circular scanning. The distribution of elements obtained through LIBS detection can accurately confirm the exact position of the source by identifying the high concentration region, so as to achieve the purpose of target source tracking.

Key words：LIBS; Circular scanning; Elemental distribution; Source tracking

Received: 2019-05-04 Accepted: 2019-10-21

ZTFLH:

O433.4

Corresponding Authors: LU Yuan E-mail: luyuan@ouc.edu.cn

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2020)06-1947-05 OR https://www.gpxygpfx.com/EN/Y2020/V40/I06/1947