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Errors in Spectrophotometry and Calibration Procedures to Avoid Them
Based on simple principles, spectrophotometry nevertheless demands a lot of precautions to avoid errors. The following properties of spectrophotometers will be discussed together with methods to test them: Spectral properties—wavelength accuracy, bandwidth, stray light; photometric linearity; intera...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology
1976
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5293527/ https://www.ncbi.nlm.nih.gov/pubmed/32196282 http://dx.doi.org/10.6028/jres.080A.060 |
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author | Reule, A. G. |
author_facet | Reule, A. G. |
author_sort | Reule, A. G. |
collection | PubMed |
description | Based on simple principles, spectrophotometry nevertheless demands a lot of precautions to avoid errors. The following properties of spectrophotometers will be discussed together with methods to test them: Spectral properties—wavelength accuracy, bandwidth, stray light; photometric linearity; interactions between sample and instrument—multiple reflections, polarization, divergence, sample wedge, sample tilt, optical path length (refractive index), interferences. Calibration of master instruments is feasible only by complicated procedures. With such a master instrument standards may be calibrated which greatly simplify performance checks of instruments used for practical work. For testing high quality spectrophotometers the use of emission lines and nearly neutral absorbing solid filters as standards seems to be superior, for some kinds of routine instruments the use of absorption bands and liquid filters may be necessary. |
format | Online Article Text |
id | pubmed-5293527 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1976 |
publisher | [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology |
record_format | MEDLINE/PubMed |
spelling | pubmed-52935272020-03-18 Errors in Spectrophotometry and Calibration Procedures to Avoid Them Reule, A. G. J Res Natl Bur Stand A Phys Chem Article Based on simple principles, spectrophotometry nevertheless demands a lot of precautions to avoid errors. The following properties of spectrophotometers will be discussed together with methods to test them: Spectral properties—wavelength accuracy, bandwidth, stray light; photometric linearity; interactions between sample and instrument—multiple reflections, polarization, divergence, sample wedge, sample tilt, optical path length (refractive index), interferences. Calibration of master instruments is feasible only by complicated procedures. With such a master instrument standards may be calibrated which greatly simplify performance checks of instruments used for practical work. For testing high quality spectrophotometers the use of emission lines and nearly neutral absorbing solid filters as standards seems to be superior, for some kinds of routine instruments the use of absorption bands and liquid filters may be necessary. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1976 1976-08-01 /pmc/articles/PMC5293527/ /pubmed/32196282 http://dx.doi.org/10.6028/jres.080A.060 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright. |
spellingShingle | Article Reule, A. G. Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title | Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title_full | Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title_fullStr | Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title_full_unstemmed | Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title_short | Errors in Spectrophotometry and Calibration Procedures to Avoid Them |
title_sort | errors in spectrophotometry and calibration procedures to avoid them |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5293527/ https://www.ncbi.nlm.nih.gov/pubmed/32196282 http://dx.doi.org/10.6028/jres.080A.060 |
work_keys_str_mv | AT reuleag errorsinspectrophotometryandcalibrationprocedurestoavoidthem |