Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology

Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology

Abstract Refractive index measurements are required when light is used as the basis of a measurement system. In dimensional metrology, refractive index measurements are used to compensate for the change in the speed of light. This is crucial because the SI unit for the metre is defined as the speed...

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Autores principales: O. Kruger, N. Chetty
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/6394f51a007549e6b5589a8b4b2884f1
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spelling oai:doaj.org-article:6394f51a007549e6b5589a8b4b2884f12021-12-02T13:41:10ZDevelopment of a permanent vacuum hollow prism air refractometer for use in dimensional metrology10.1038/s41598-021-88697-42045-2322https://doaj.org/article/6394f51a007549e6b5589a8b4b2884f12021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88697-4https://doaj.org/toc/2045-2322Abstract Refractive index measurements are required when light is used as the basis of a measurement system. In dimensional metrology, refractive index measurements are used to compensate for the change in the speed of light. This is crucial because the SI unit for the metre is defined as the speed of light in a vacuum. Air refractometers are the most accurate way to measure the speed of light in air. Many research works to date have been performed to measure the refractive index of air using refractometers. This research uses a commercial prism as the vacuum etalon instead of the tube that is used most often. This novelty and newness of our research were to focus on the design, fabrication and testing of a refractometer which uses a permanent vacuum for ease of use but that will still have the same accuracy of other refractometers currently in use. Modifications to existing designs improved the long-term stability compared to other prism refractometers and are also potentially more accurate than tube refractometers. The results achieved with this permanent vacuum refractometer are accurate to 8.4 × 10–8, which compares favourably with other refractometers on accuracy. It also has the added advantage that it does not require a vacuum pump, and with added laser path improved long term stability but still portable and robust enough to use in everyday applications.O. KrugerN. ChettyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
O. Kruger
N. Chetty
Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
description Abstract Refractive index measurements are required when light is used as the basis of a measurement system. In dimensional metrology, refractive index measurements are used to compensate for the change in the speed of light. This is crucial because the SI unit for the metre is defined as the speed of light in a vacuum. Air refractometers are the most accurate way to measure the speed of light in air. Many research works to date have been performed to measure the refractive index of air using refractometers. This research uses a commercial prism as the vacuum etalon instead of the tube that is used most often. This novelty and newness of our research were to focus on the design, fabrication and testing of a refractometer which uses a permanent vacuum for ease of use but that will still have the same accuracy of other refractometers currently in use. Modifications to existing designs improved the long-term stability compared to other prism refractometers and are also potentially more accurate than tube refractometers. The results achieved with this permanent vacuum refractometer are accurate to 8.4 × 10–8, which compares favourably with other refractometers on accuracy. It also has the added advantage that it does not require a vacuum pump, and with added laser path improved long term stability but still portable and robust enough to use in everyday applications.
format article
author O. Kruger
N. Chetty
author_facet O. Kruger
N. Chetty
author_sort O. Kruger
title Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
title_short Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
title_full Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
title_fullStr Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
title_full_unstemmed Development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
title_sort development of a permanent vacuum hollow prism air refractometer for use in dimensional metrology
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/6394f51a007549e6b5589a8b4b2884f1
work_keys_str_mv AT okruger developmentofapermanentvacuumhollowprismairrefractometerforuseindimensionalmetrology
AT nchetty developmentofapermanentvacuumhollowprismairrefractometerforuseindimensionalmetrology
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