In Most IR Thermometers & In Filter Radiometers
Online — A recent online copy of a significant technical poster, Size-of-Source Effect Sensitivities In Filter Radiometers, (Authors: M. R. Dury, T. C. Arneil, G. Machin and M. Goodman), on the National Physical Laboratory (NPL) website?? is now freely available as a PDF (1.05MB) download online on the site.
The introduction to the article begins:
“When performing high accuracy radiation thermometry, the size-of-source effect (SSE) of a filter radiometer* can provide a significant contribution to the uncertainties** associated with the measurements.”
The article is available online at: http://www.scribd.com/doc/178075232/Size-of-Source-Effect-Sensitivities-In-Filter-Radiometers and, at present ,on the NPL website at: http://www.npl.co.uk/publications/science-posters/size-of-source-effect-sensitivities-in-filter-radiometers
NPL is the UK???s National Measurement Institute, and a world-leading centre of excellence in developing and applying the most accurate measurement standards, science and technology available.
National Physical Laboratory
Teddington, Middlesex, TW11 0LW
Tel: 020 8977 3222
* ED NOTE 1: For newbies to non-contact temperature measurements by Radiation Thermometers (Infrared Thermometers or Radiation Pyrometers) the SSE is a known, often very significant, error source in both calibrating and using such sensors.?? For a relatively inexpensive primer on the topic read the article “Establishing a Calibration Laboratory for Industrial Radiation Thermometry” by Barber & Brown, in the little 1985 ASTM book, available as a paid PDF download at: (http://www.astm.org/DIGITAL_LIBRARY/STP/SOURCE_PAGES/STP895.htm ) – “Applications of Radiation Thermometry”
** ED NOTE 2: The term Uncertainty is the technically preferred term describing inaccuracy or error in measurement and often a difficult part of any measurement process is proving that the most likely error is within acceptable tolerance limits.