Temporal-resolved measurement plays an important role in laser-induced breakdown spectroscopy (LIBS), and intensified CCD camera (ICCD) is widely applied in this field. In this work, we proposed a simple way instead of ICCD to achieve temporal-resolved detection using a dual light-collection worked with 2 CMOS cameras or 2 fiber spectrometers. In the measurement, the cameras / spectrometers were simultaneously operated under two different detection-delay with respect to the pulsed laser, and a subtraction between 2 detections was carried out as the gate width to capture evolution of the plasma morphology or the emission intensity. With aid of this method, we have successfully obtained the dynamic change of plasma and the intensity variation of LIBS signal in the regime from nanoseconds to microseconds. As a comparison, ICCD and grating-spectrometer were also employed to confirm the obtained results. It is suggested that the proposed method is a practical way for temporal-resolved imaging or spectra detection for LIBS, and the on-site application would be the prospective field for this method in future.

时间分辨测量在激光诱导击穿光谱法（LIBS）中起着重要作用，而增强型CCD相机（ICCD）在该领域得到了广泛的应用。在这项工作中，我们提出了一种简单的方法来代替ICCD，该方法使用与2台CMOS相机或2台光纤光谱仪一起工作的双光采集来实现时间分辨检测。在测量中，相对于脉冲激光，照相机/光谱仪在两个不同的检测延迟下同时运行，并且两次检测之间的相减作为门宽进行，以捕获等离子体形态或发射强度的变化。借助这种方法，我们成功地获得了从纳秒到微秒的等离子体动态变化和LIBS信号的强度变化。作为比较，还使用了ICCD和光栅光谱仪来确认所获得的结果。提出该方法是一种用于LIBS时间分辨成像或光谱检测的实用方法，现场应用将是该方法的未来领域。