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Optical in-process height measurement system for process control of laser metal-wire deposition
摘要： We propose an in-process height measurement system for a weld bead and feedback control system for wire-feeding speed for high-quality laser deposition. Metal additive manufacturing, especially laser metal-wire deposition, is effective for complex shape fabrication and repair processing. However, we must control the gap between a weld bead and a feed wire in an optimal range for high-quality deposition. Conventionally, the Z-stage pitch for multi-layer deposition must be precisely adjusted by each deposition shape. In this paper, we design an in-process height measurement system that is integrated in a laser processing head, which measures the weld bead height by a line section method. We decreased the influence of the intense thermal radiation generated from a melt pool by inserting the band-pass filter of the line beam’s wavelength in the imaging system and optimizing its line laser power. Consequently, our system can measure the weld bead height near the melt pool, which is 4 mm in front of it. Next we show that our proposed system can measure the weld bead height during wire-laser metal deposition with 50-μm accuracy by comparing its value to the true value. Finally, we achieved a cylinder shape deposition of 50-mm height, regardless of the Z-stage pitch and the cylinder diameter of the multi-layer deposition, by controlling the wire-feeding speed based on the measured weld bead height.
关键词： Laser Metal Deposition,Light Section Method,Optical Sensing,Height Measurement,Process Monitoring,Additive Manufacturing
更新于2025-09-12 10:27:22
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[American Society of Agricultural and Biological Engineers 2019 Boston, Massachusetts July 7- July 10, 2019 - ()] 2019 Boston, Massachusetts July 7- July 10, 2019 - <i>Laser detection of the boundary of UAV spray operation</i>
摘要： The agricultural plant protection UAV is beneficial to reducing pesticide, improving utilization rate, reducing harm to human beings and animals. The boundary detection and identification of the drone spray operation is an important aspect of the UAV spraying. The two-dimensional laser scanning range finder has the function of measuring object reflection characteristics. In order to obtain the detailed field information in the sampling interval, the laser detection system constructed not only measures the distance from the UAV to the rice and ridge, but also measures the reflection value of the rice and ridge. The distance between the rice and ridge is used as the threshold to identify the boundary. The signal division point appears near 1m with a variance of 0.27m. In the process of segmentation, there are many misjudgment points on the left side of the laser emission origin. Accurate identification of boundaries can provide a basis for path planning, especially the UAV spraying.
关键词： Boundary identification,UAV,2D Laser Range finder,Height measurement,GPS
更新于2025-09-11 14:15:04