Libs-type object sorting device

A laser induced breakdown spectroscopy (LIBS)-type object sorting device configured to perform LIBS analysis on an object to be sorted while conveying the object to be sorted with a conveyor, the LIBS-type object sorting device being configured to sort the object to be sorted, the LIBS-type object sorting device comprising, with a traveling direction, a width direction, and a height direction of the conveyor defined as X, Y, and Z, respectively:

• a three-dimensional-shape measurement means configured to repeatedly measure a cross-sectional shape of the object to be sorted at u cross-section-measurement YZ vertical face every predetermined lime, the three-dimensional-shape measurement means being configured to acquire a space-coordinate group of a top face of the object to be sorted in top view on the conveyor with a reference origin on the object to be sorted as a reference;
• an LIBS analyzing means including a width-direction movement means configured to move a beam position of laser light in a Y direction in a laser-movement YZ vertical face and a height-direction movement means configured to move a beam-focus position of the laser light in a Z direction in the laser-movement YZ vertical face, the LIBS analyzing means being configured to perform chemical composition analysis on the object to be sorted while irradiating the object to be sorted with the laser light,
• a conveying-path switching means configured to switch u conveying path in the Z direction of the object to be sorted subjected to the chemical composition analysis, the three-dimensional-shape measurement means, the LIBS analyzing means, and the conveying-path switching means being provided in this order in the X direction;
• a computing means configured to acquire the space-coordinate group of the top race on an analysis XZ vertical late including an analyzing point selected from the space coordinates, the computing means being configured to determine an analyzing section on which the LIBS analysis is to be performed;
• and
• a control means configured to cause the width-direction movement means to move the beam position to the analysis XZ vertical face, the control means being configured to cause, when detecting that the analyzing section has reached the analysis XZ vertical face from a movement amount of the conveyor, based on the movement amount, the height-direction movement means to move the beam-focus position to the space coordinates along the analyzing section while causing the object to be sorted to be irradiated with the laser light.