强激光与粒子束2017，Vol.29Issue(9)：152-156,5.DOI:10.11884/HPLPB201729.170104
铝合金中铬元素的时间分辨激光诱导击穿光谱高灵敏检测
Time-resolved high sensitivity signal detection of chromium in aluminum alloy by laser-induced breakdown spectroscopy
摘要
Abstract
In order to eliminate the influence of strong Bremsstrahlung emission existed in laser-induced plasma on photomultiplier tube (PMT) and preamplifier and to improve signal detection sensitivity of laser-induced breakdown spectroscopy (LIBS), an end-on gated PMT was designed based on CR110 PMT and was used in weak signal detection of LIBS.The influence of strong Bremsstrahlung emission of the plasma could be successfully eliminated and the weak atomic emission signal could be further amplified after using this gated PMT combined with a preamplifier in signal detection, thus the spectral analysis sensitivity could be improved significantly.In analysis of chromium in aluminum alloy samples by LIBS, the limit of detection of chromium reached 5.55 ppm using this gated PMT as the signal detector, the detectability was improved nearly 6 folds in comparison with that using normal PMT.It was demonstrated that application of this gated photomultiplier tube in time-resolved signal detections could give good measurement results.关键词
光谱学/激光诱导击穿光谱/门控光电倍增管/时间分辨信号检测/铬Key words
spectroscopy/laser-induced breakdown spectroscopy/gated photomultiplier tube/time-resolved signal detection/chromium分类
数理科学引用本文复制引用
康娟,陈钰琦,杨宇翔,李润华..铝合金中铬元素的时间分辨激光诱导击穿光谱高灵敏检测[J].强激光与粒子束,2017,29(9):152-156,5.基金项目
国家重点基础研究发展计划项目 （）
国家自然科学基金项目(11274123, 11304100) （11274123, 11304100）
