Research of thin plate thickness measurement based on single lens laser triangulation

In order to measure the thickness of thin plates accurately,the principle of thickness measurement based on double light path laser triangulation was summarized,and a gauging system based upon single lens laser triangulation was established.This system consists of two symmetrically-installed laser devices,a single lens imaging system,an image acquisition system and a data analysis system.Then the principle of measurement,measurement method and experimental facility were described.In the following part,the relation between system distinguishability and intersection angle among laser beam axis line and imaging lens axis was discussed,after that the least square fitting method was selected to get the fitted equation between measure thickness and flare spacing convenient to data analysis.Finally,a calibration experiment was conducted to demonstrate the accuracy.It is found that this system not only eliminate the difficulty of synchronization problem laid in double light path laser triangulation method but also has a high distinguishability,it meets the commercial measurement demand well.