Lin Yong-Zeng, Yao Ming-Yin, Liu Mu-Hua, Peng Qiu-Mei, Zhang Xu, Chen Tian-Bing, Xu Yuan
Optics-Electrics Application of Biomaterials Lab, College of Engineering, Jiangxi Agricultural University, Nanchang 330045 China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Nov;32(11):2925-8.
In order to improve the precision and sensitivity of laser-induced breakdown spectroscopy device on detecting heavy metal, parameter optimization should be done. After selecting the initial delay time parameter in detecting navel orange experiment of laser-induced breakdown spectroscopy device, a cell range from 1.10 to 1.30 micros of delay time containing the initial parameter was extracted and experiment on it was conducted. There are more than one peak in the curve of element line intensity and signal-to-background ratio vs the delay time in the cell range, and the peak values are higher than the initial one. Confidence interval of the delay time calculated indirectly by interval estimation in Statistics is (1.13, 1.25). The relative standard deviation decreases from 0. 103 269 548 to 0. 025 322 279 5 when the delay time adjusted from 1.20 to 1.14 micros in the confidence interval. It is suggested that parameters range of LIBS experimental device can be adjusted freely in the range while detecting measured elements so as to improve the precision and sensitivity.
为了提高激光诱导击穿光谱仪检测重金属的精度和灵敏度，需要进行参数优化。在激光诱导击穿光谱仪检测脐橙实验中选择初始延迟时间参数后，提取了一个包含初始参数的1.10至1.30微秒延迟时间的单元范围，并对其进行了实验。在该单元范围内，元素线强度和信背比与延迟时间的曲线中有多个峰值，且峰值高于初始值。通过统计学中的区间估计间接计算出的延迟时间的置信区间为(1.13, 1.25)。当延迟时间在置信区间内从1.20微秒调整到1.14微秒时，相对标准偏差从0.103269548降至0.0253222795。建议在检测被测元素时，可在该范围内自由调整激光诱导击穿光谱实验装置的参数范围，以提高精度和灵敏度。
