A measurement system of plane displacement in rigid body was designed. Plane displacement was calculated by the
cross-correlation of speckle image. Measurement results showed that the absolute-error and the opposite-error of the
plane displacement less than ±14μm and ±6.25% respectively, under the displacement range of 300μm.
This paper reports studies on metals in the liquid by laser-induced breakdown spectroscopy in order to detection of
heavy metals in industrial wastewater. A measuring device by LIBS has been established which including the Nd:YAG
laser, Echelle spectrograph, intensified charge-coupled device (ICCD) and liquid jet. The characteristic spectral lines of
twelve metals in actual industrial wastewater from a certain nonferrous metals company were analyzed using LIBS. The
calibration curves of the metals in liquid were acquired by the experiment and the linear correlation coefficients were
high. The detection limits of metals obtained from the liquid were low, especially for the Ca, Cu, K, Mg, Mn and Na.
The results show that the measuring system can be applied in the on-line, rapid detection of heavy metals in industrial
wastewater, and it has wide range of applications.