关键词: 热轧钢板, 厚度测量, 误差补偿, 在线检测

Abstract: Laser measuring instruments have been commonly used for precise thickness measurement. However,traditional dual-laser thickness measurement methods face the problem of decreased accuracy due to steel plate deformation and vibration. To address this issue, it proposes a novel dual-laser thickness measurement method that integrates dynamic spatial attitude compensation and online sensor calibration. This method introduces the spatial attitude of the steel plate as a key observation variable,establishing a dynamic compensation relationship with the thickness measurement value. Furthermore,an error observer is designed to model the sensor′s persistent bias as an augmented state for real-time estimation and compensation. Verification results on a custom experimental platform show that under the condition of a 20° steel plate tilt and a nominal thickness of 10 mm,this method significantly reduces the thickness measurement error from 0.561 mm in the uncompensated system to 0.037 mm,improving accuracy by an order of magnitude. This research provides a practical solution combining high precision and strong robustness for precise thickness monitoring under dynamic working conditions.

Key words: hot-rolled steel plate, thickness measurement, error compensation, online measurement