Automação de dispositivo para medição de limite de liquidez Concha Casagrande com sensor laser

Abstract

The mechanical device, knows as Concha de Casagrande device, is used as pattern to determine soil. Currently exist twice device version in market, a manual, without hit counter, ane other with hit counter and eletric engine for moviment shell axis. Like to two version depend for operator ability during the test, none of them manage to provide precision and repeatability in results.This theasi is the continuation of the electronic implementation on the device, thus contributing to the automation of the egress graduate Cristiane Barbosa Prado, wherever the automated movement of the motor was performed at a frequency of 120 Hz and a stroke counter presented to the user through a display. The new stage of the process has a laser sensor of the type LiDAR that captures points along the shell in an indirect way, ending the process with the engine stopping when it reaches 12.7 mm in length in the shell extension and shlowing the number of laps at the end of the process.