Problems of temperature control in laser metalworking using a thermal imager

The paper investigated the accuracy of temperature measurements during laser hardening of structural steel using a thermal imager operating in the mid-infrared range (8-14 microns). Experiments were conducted on installations equipped with fiber lasers, LENS 750 and ЛС-10. Several factors have been identified that affect the accuracy of measurements. These include the reflection of laser radiation, the camera resolution, incorrectly adjusted emission coefficients, and the interaction between laser radiation and air during discharge. In order to improve the accuracy, several methods have been proposed. These methods include the use of optical filters, optimization of the observation distance, and correction of emission coefficients. The study's results indicated the need for comprehensive calibration of the system in order to ensure accurate surface temperature measurement.