Study on LT Accuracy Improvement by Calibration Based on Network Measurements

Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. However, they require specialized equipment. A calibration procedure to improve the LT accuracy in an ea...

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Autores principales:	Jesús Velázquez, Javier Conte, Ana Cristina Majarena, Jorge Santolaria
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	calibration laser tracker network measurement accuracy working environment conditions Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/b6b9e03db1fe4b8d830975678cd69f8d
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spelling	oai:doaj.org-article:b6b9e03db1fe4b8d830975678cd69f8d2021-11-25T18:56:46ZStudy on LT Accuracy Improvement by Calibration Based on Network Measurements10.3390/s212274791424-8220https://doaj.org/article/b6b9e03db1fe4b8d830975678cd69f8d2021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7479https://doaj.org/toc/1424-8220Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. However, they require specialized equipment. A calibration procedure to improve the LT accuracy in an easy and fast way is presented in this paper. This method is based on network measurements where a set of reflectors were measured from different LT positions in a working environment. The methodology proposed deal with the lack of nominal data of the reflector mesh. A measurement scenario was defined, based on error parameter dependence on distances and angles, thus, obtaining those positions more sensitive to errors. The influence of the incidence angle of the laser beam on the reflector was characterized, revealing that its contribution to the LT measurement error can be up to 13 µm. Error kinematic parameters were identified to provide the optimum value of an objective function, where the reflector mesh nominal data were unknown. The calibration procedure was validated with nominal data, by measuring a set of reflectors located on a coordinate measuring machine. The findings of this study suggested that the LT accuracy can be improved up to 25%. Moreover, the method can be carried out by the LT user without requiring specialized equipment.Jesús VelázquezJavier ConteAna Cristina MajarenaJorge SantolariaMDPI AGarticlecalibrationlaser trackernetwork measurementaccuracyworking environment conditionsChemical technologyTP1-1185ENSensors, Vol 21, Iss 7479, p 7479 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	calibration laser tracker network measurement accuracy working environment conditions Chemical technology TP1-1185
spellingShingle	calibration laser tracker network measurement accuracy working environment conditions Chemical technology TP1-1185 Jesús Velázquez Javier Conte Ana Cristina Majarena Jorge Santolaria Study on LT Accuracy Improvement by Calibration Based on Network Measurements
description	Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. However, they require specialized equipment. A calibration procedure to improve the LT accuracy in an easy and fast way is presented in this paper. This method is based on network measurements where a set of reflectors were measured from different LT positions in a working environment. The methodology proposed deal with the lack of nominal data of the reflector mesh. A measurement scenario was defined, based on error parameter dependence on distances and angles, thus, obtaining those positions more sensitive to errors. The influence of the incidence angle of the laser beam on the reflector was characterized, revealing that its contribution to the LT measurement error can be up to 13 µm. Error kinematic parameters were identified to provide the optimum value of an objective function, where the reflector mesh nominal data were unknown. The calibration procedure was validated with nominal data, by measuring a set of reflectors located on a coordinate measuring machine. The findings of this study suggested that the LT accuracy can be improved up to 25%. Moreover, the method can be carried out by the LT user without requiring specialized equipment.
format	article
author	Jesús Velázquez Javier Conte Ana Cristina Majarena Jorge Santolaria
author_facet	Jesús Velázquez Javier Conte Ana Cristina Majarena Jorge Santolaria
author_sort	Jesús Velázquez
title	Study on LT Accuracy Improvement by Calibration Based on Network Measurements
title_short	Study on LT Accuracy Improvement by Calibration Based on Network Measurements
title_full	Study on LT Accuracy Improvement by Calibration Based on Network Measurements
title_fullStr	Study on LT Accuracy Improvement by Calibration Based on Network Measurements
title_full_unstemmed	Study on LT Accuracy Improvement by Calibration Based on Network Measurements
title_sort	study on lt accuracy improvement by calibration based on network measurements
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b6b9e03db1fe4b8d830975678cd69f8d
work_keys_str_mv	AT jesusvelazquez studyonltaccuracyimprovementbycalibrationbasedonnetworkmeasurements AT javierconte studyonltaccuracyimprovementbycalibrationbasedonnetworkmeasurements AT anacristinamajarena studyonltaccuracyimprovementbycalibrationbasedonnetworkmeasurements AT jorgesantolaria studyonltaccuracyimprovementbycalibrationbasedonnetworkmeasurements
_version_	1718410548441251840

Study on LT Accuracy Improvement by Calibration Based on Network Measurements

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