激光诱导击穿光谱技术（LIBS）是一种被广泛使用的物质元素检测技术。由于它的探测结果受多种因素的影响，因此，分析比较不同实验条件对 LIBS 光谱测量的影响对 LIBS 检测有着重要的意义。通过采用四川省北川县中联水泥有限公司生产的42．5普通硅酸盐水泥制成的水泥压片，利用八通道光纤光谱仪AvaSpec-2048-USB2-RM、延时触发器 DG645进行了 LIBS 检测。针对影响水泥几种重要技术指标的金属元素 Mg，Al，Na，K 进行了分析。主要对比了激光频率、同一点测量次数对不同金属元素光谱信号强度的影响，得出在本实验条件下的最佳实验参数：10 Hz 为最佳激光频率，激光频率为10 Hz 时元素 Mg，Al，Na， K 所得到的光谱强度比8 Hz 时分别提高了67．66％，47．88％，84．59％，43．36％。由于压片样品在放置过程中，表面会有少量的氧化、潮解，在以测量10次求一次平均所得结果进行记录的条件下，以第三、四次记录结果为最佳。%Laser induced breakdown spectroscopy (LIBS)is a widely used material element detection technology.Because of its detection result is affected by many factors,and therefore,analysing and comparising the different experimental conditions have important significance for LIBS.Experimental sample produced by Beichuan County,Sichuan Province,China,which is ordinary Portland cement P.O42.5,using eight-channel fiber optic spectrometer AvaSpec-2048-USB2-RM,delay trigger DG645 for LIBS testing.Several metallic elements as Mg,Al,Na,K,which affect cement’s technical indicators were analyzed.Mainly com-pares the effect of laser frequency,the same point measurement times on different metal element spectral signal intensity,the op-timum experimental parameters under the condition of this experiment:10 Hz was the best laser frequency.When laser frequen-cy is 10 Hz,the spectrum intensity of elements Mg,Al,Na,K were increased by 67.66%,47.88%,84.59%,43.36% than 8 Hz.Because the tablet samples in place,the surface will have a small amount of oxidation and deliquescence,in order to measure 10 times for an average income results were recorded under the condition,with third,four records of results for the best.
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