Double Layer Detection of Sheet Metal and Body Parts by Laser Distance Sensors Triangulation
In the automotive industry, sheet metal parts are taken from a stock by a robot gripper and fed to the welding robot. Several sheets can stick together due to adherent oil, wedging of the sheets or magnetic charge. To ensure that only one sheet is gripped per assembly process, two laser distance sensors triangulation are mounted at opposite positions. The sensors measure the distance to the sheet and then calculate the sheet thickness via a difference calculation. If this result is greater than that of an individual sheet, a signal is output.

Diameter Measurement of Metal Coils in Punching Systems Using Laser Distance Sensor Triangulation
In punching machines in the metal processing industry, continuous material replenishment of sheet rolls, so-called coils, must be guaranteed. To avoid downtimes, it is necessary to detect the end of the material at an early stage to initiate an automatic roll change. For this purpose, the diameter of the shiny metal coils is precisely monitored via laser distance sensor triangulation and communicated to the control system. If the diameter falls below a defined tolerance value, a signal to replace the sheet rolls is automatically sent.

Double Layer Detection for Sheet Metal with Laser Distance Sensor Triangulation in the Automotive Industry
During the automatic removal of flat metal sheets from a supply by a robot, several sheets can stick together due to the magnetic charge. The thickness of the sheets must be detected to ensure that only one sheet per assembly process is gripped. For this purpose, two laser distance sensor triangulation are installed opposite each other after removal. One measures from above to the sheet, the other laser sensor from below. The sheet thickness is thus determined using a differential calculation. If this result is greater than that of an individual sheet, a signal is output.