scholarly journals On-Line Measurement of Wood Surface Smoothness

2020 ◽  
Vol 71 (2) ◽  
pp. 193-200
Author(s):  
Jakub Sandak ◽  
Kazimierz A. Orlowski ◽  
Anna Sandak ◽  
Daniel Chuchala ◽  
Piotr Taube
Keyword(s):  
Surface Topography ◽  
Wood Surface ◽  
Surface Defects ◽  
Surface Shape ◽  
Blue Color ◽  
Original Algorithm ◽  
On Line ◽  
Illuminating Light ◽  
Scanning Head ◽  
New Generation

The latest progress in the field of optics and microelectronics resulted in the development of new generation vision systems capable of scanning surface topography with very high sampling frequencies. The blue color of illuminating light as well as novel systems for controlling ultra-thin laser line thickness allows the measurement of the porous surface of wood with a triangulation method. Three alternative sensors were tested here in order to verify their suitability for the determination of surface topography in the industrial environment. The scanning head was installed at the exit zone of the four-side profiling moulder and was set to scrutinize the wood surface shape line-by-line, immediately after profiling. The sensor was also tested for automatic detection of surface defects appearing on the elements after sanding, wetting and painting with various finishing products. The set of pilot test results is presented, together with an original algorithm for real-time surface defects detection.

Design and Implementation of the Cold-Rolled Aluminum Plate Surface On-Line Defect Detection System

2013 ◽  
Vol 712-715 ◽  
pp. 2323-2326
Author(s):  
Xing Guang Qi ◽  
Hai Lun Zhang ◽  
Xiao Ting Li
Keyword(s):  
High Speed ◽  
Surface Defects ◽  
Detection System ◽  
Aluminum Plate ◽  
Gigabit Ethernet ◽  
Accurate Detection ◽  
High Processing Speed ◽  
Rolled Aluminum ◽  
On Line ◽  
Cold Rolled

This paper presents an on-line surface defects detection system based on machine vision, which has high speed architecture and can perform high accurate detection for cold-rolled aluminum plate. The system consists of high speed camera and industrial personal computer (IPC) array which connected through Gigabit Ethernet, achieved seamless detection by redundant control. In order to acquire high processing speed, single IPC as processor receives from and deals with only one or two cameras' image. Experimental results show that the system with high accurate detection capability can satisfy the requirement of real time detection and find out the defects on the production line effectively.

scholarly journals Research of the On-Line Evaluating the Cylindricity Error Technology Based on the New Generation of GPS

2017 ◽  
Vol 174 ◽  
pp. 402-409 ◽  
Author(s):  
Peng Zheng ◽  
Jian-quan Wu ◽  
Lin-na Zhang
Keyword(s):  
On Line ◽  
New Generation ◽  
Cylindricity Error

On-line detection of surface defects on steel billets using multiple grazing-incidence light sources

1992 ◽  
Author(s):  
Marc L. Dufour ◽  
Marc Samson
Keyword(s):  
Surface Defects ◽  
Grazing Incidence ◽  
Line Detection ◽  
Light Sources ◽  
On Line

scholarly journals Development of surface reconstruction algorithms for optical interferometric measurement

2020 ◽  
Author(s):  
Dongxu Wu ◽  
Fengzhou Fang
Keyword(s):  
Surface Topography ◽  
Dynamic Range ◽  
Functional Performance ◽  
Theoretical Background ◽  
Optical Interferometry ◽  
Reconstruction Algorithms ◽  
Fringe Analysis ◽  
Intelligent Sampling ◽  
On Line ◽  
Accuracy And Repeatability

AbstractOptical interferometry is a powerful tool for measuring and characterizing areal surface topography in precision manufacturing. A variety of instruments based on optical interferometry have been developed to meet the measurement needs in various applications, but the existing techniques are simply not enough to meet the ever-increasing requirements in terms of accuracy, speed, robustness, and dynamic range, especially in on-line or on-machine conditions. This paper provides an in-depth perspective of surface topography reconstruction for optical interferometric measurements. Principles, configurations, and applications of typical optical interferometers with different capabilities and limitations are presented. Theoretical background and recent advances of fringe analysis algorithms, including coherence peak sensing and phase-shifting algorithm, are summarized. The new developments in measurement accuracy and repeatability, noise resistance, self-calibration ability, and computational efficiency are discussed. This paper also presents the new challenges that optical interferometry techniques are facing in surface topography measurement. To address these challenges, advanced techniques in image stitching, on-machine measurement, intelligent sampling, parallel computing, and deep learning are explored to improve the functional performance of optical interferometry in future manufacturing metrology.

Ultrasonic Transmission Characteristics of Continuous Casting Slab for Medium Carbon Steel

2005 ◽  
Vol 297-300 ◽  
pp. 2201-2206
Author(s):  
Jun Youn Lee ◽  
Soon Bok Lee ◽  
Jae Kyung Yi
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
Surface Defects ◽  
Medium Carbon Steel ◽  
Carbon Steels ◽  
Ultrasonic Waves ◽  
Transmission Characteristics ◽  
Medium Carbon ◽  
Continuous Casting Slab ◽  
On Line

Until now, surface defects of continuous casting slab have been removed by the enforced surface scarfing to produce high quality steel materials. An evaluation technique for surface and internal defects of slab is required to enhance the production of medium carbon steels and acquire defect-map. Accordingly as a preliminary step, longitudinal wave testing and Rayleigh wave testing were carried out on slab specimens of medium carbon steel to get basic transmission characteristics of ultrasonic waves. This research provides as basic data for on-line defect estimation using a laser ultrasonic or EMAT in non-contact ultrasonic detecting techniques in future.

New generation of monitoring systems with on-line diagnostics

1995 ◽  
Vol 29 (3-4) ◽  
pp. 215-227 ◽  
Author(s):  
U. Kunze ◽  
B. Bechtold
Keyword(s):  
Monitoring Systems ◽  
On Line ◽  
New Generation
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