Abstract：The intensities and signal-to-noise ratios(SNRs)of characteristic spectrum are remarkably different under disparate delay times in Laser-Induced Breakdown Spectroscopy(LIBS), which affects the performance of quantitative analysis directly. Conventionally, the general digital delay generator is used to control the delay time in LIBS, butit’s not suitable for compact LIBS equipmentsdue to its large size, high power and high price. In this study, a compact synchronizer (LDG3.0) with 55 ps resolution was designed and built by using a microcontroller unit and simple circuits. The LDG3. 0 had a considerably smaller size, lower power and lower price than a general digital delay generator DG535. Quantitative analysis of V element in iron samples was investigated to compare the performance of LDG3.0 and DG535 in LIBSsystem. The results showed that the two LIBS systems with LDG3.0 and DG535 had almost the same calibration curve of V, and the determination coefficient R2 were both above 0.997. The average relative standard deviation(RSD) of V by LIBS system with LDG3.0 was 2.28% which slightly smaller than LIBS system with DG535, and the limit of detection (LoD) of the former was 19.90 μg·g-1 which sligthly below the latter. Therefore, the self-builtsynchronizer LDG3.0 has approximately the same accuracy with DG535 in LIBS systemand meets the control and integration requirements of LIBS. The LDG3.0 is especially suitable for compact LIBS instruments.
Key words：Laser-induced breakdown spectroscopy; Compactsynchronous timing generator; Delay times
李秋实，李嘉铭，杨 平，杨新艳，郝中骐，沈 萌，朱毅宁，郭连波，李祥友，曾晓雁. 激光诱导击穿光谱分析系统中微型同步时序发生器研制[J]. 光谱学与光谱分析, 2018, 38(02): 595-599.
LI Qiu-shi, LI Jia-ming, YANG Ping, YANG Xin-yan, HAO Zhong-qi, SHEN Meng, ZHU Yi-ning, GUO Lian-bo, LI Xiang-you, ZENG Xiao-yan. Development of a Compact Synchronizer for Laser-Induced Breakdown Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(02): 595-599.
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