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Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems

The light-pen coordinate measuring machine (LPCMM for short) is portable and flexible to measure features including invisible ones in-situ. Since different styluses are needed to measure different features and even during the process of measuring a single workpiece with complicated configurations, t...

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Detalles Bibliográficos
Autores principales: Zhang, Rui, Liu, Shugui, Wang, Sen, Song, Xuanxiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5298704/
https://www.ncbi.nlm.nih.gov/pubmed/28085043
http://dx.doi.org/10.3390/s17010131
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author Zhang, Rui
Liu, Shugui
Wang, Sen
Song, Xuanxiao
author_facet Zhang, Rui
Liu, Shugui
Wang, Sen
Song, Xuanxiao
author_sort Zhang, Rui
collection PubMed
description The light-pen coordinate measuring machine (LPCMM for short) is portable and flexible to measure features including invisible ones in-situ. Since different styluses are needed to measure different features and even during the process of measuring a single workpiece with complicated configurations, to improve the system measurement accuracy it is beneficial to calibrate the stylus tip center position after it is mounted to the light-pen before measurement in an industrial field. A novel and simple method aiming at self-calibrating the position of the tip center based on invariable distances is presented. The distinguishing feature of the proposed method is that the center position of the tip can be calibrated by using a kinematic seat with an inverted cone hole without any external reference and auxiliary devices. Calibration is based on that the distance between the tip center and that of any LED is invariable when the light-pen is swung smoothly with its spherical tip firmly touching the fixed cone seat. To ensure the repeatability of the algorithm some error constraint parameters are given. Based on invariable distances, the tip center position in the light-pen coordinate system can be obtained. Experiment results show that the self-calibration method has the advantage of good repeatability, with standard deviations 0.027, 0.023 and 0.014 mm in U, V and W directions, respectively. Experimental results of measuring a circle and a gauge block indirectly demonstrate the accuracy of the proposed self-calibration method.
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spelling pubmed-52987042017-02-10 Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems Zhang, Rui Liu, Shugui Wang, Sen Song, Xuanxiao Sensors (Basel) Article The light-pen coordinate measuring machine (LPCMM for short) is portable and flexible to measure features including invisible ones in-situ. Since different styluses are needed to measure different features and even during the process of measuring a single workpiece with complicated configurations, to improve the system measurement accuracy it is beneficial to calibrate the stylus tip center position after it is mounted to the light-pen before measurement in an industrial field. A novel and simple method aiming at self-calibrating the position of the tip center based on invariable distances is presented. The distinguishing feature of the proposed method is that the center position of the tip can be calibrated by using a kinematic seat with an inverted cone hole without any external reference and auxiliary devices. Calibration is based on that the distance between the tip center and that of any LED is invariable when the light-pen is swung smoothly with its spherical tip firmly touching the fixed cone seat. To ensure the repeatability of the algorithm some error constraint parameters are given. Based on invariable distances, the tip center position in the light-pen coordinate system can be obtained. Experiment results show that the self-calibration method has the advantage of good repeatability, with standard deviations 0.027, 0.023 and 0.014 mm in U, V and W directions, respectively. Experimental results of measuring a circle and a gauge block indirectly demonstrate the accuracy of the proposed self-calibration method. MDPI 2017-01-11 /pmc/articles/PMC5298704/ /pubmed/28085043 http://dx.doi.org/10.3390/s17010131 Text en © 2017 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Rui
Liu, Shugui
Wang, Sen
Song, Xuanxiao
Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title_full Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title_fullStr Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title_full_unstemmed Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title_short Stylus Tip Center Position Self-Calibration Based on Invariable Distances in Light-Pen Systems
title_sort stylus tip center position self-calibration based on invariable distances in light-pen systems
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5298704/
https://www.ncbi.nlm.nih.gov/pubmed/28085043
http://dx.doi.org/10.3390/s17010131
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