Research on Capacitance Compensation for Temperature Changes in Laser Cutting Systems

To address the problem that changes in ambient temperature during the laser cutting process will change the capacitance value measured between the nozzle of the cutting head and the plate, thus affecting the cutting effect. In this paper, the capacitance value is collected by the STM32F405RGT6 microprocessor and PCAP02, and the relationship curve between the capacitance value and the temperature value is collected to get the slope value of the curve in each temperature interval, and the compensation capacitance value is obtained by using the compensation formula. By verifying it on the CODESYS platform, the compensation is turned on when the ambient temperature changes and the compensated capacitance value is restored to the calibrated capacitance value within lms, the Z-axis change curve fluctuates normally, and the dynamic following accuracy is restored to 0.1mm. The design enables the laser cutting system to be unaffected by changes in ambient temperature that may affect cutting results.