ASTM E2847-13e1

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Designation:E2847 −13
StandardTest Method for
Calibration and Accuracy Verification of Wideband Infrared
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Thermometers
This standard is issued under the fixed designation E2847; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Title corrected editorially in September 2013.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This test method covers electronic instruments intended
E344 Terminology Relating to Thermometry and Hydrom-
for measurement of temperature by detecting the intensity of
etry
thermal radiation exchanged between the subject of measure-
E1256 Test Methods for Radiation Thermometers (Single
ment and the sensor.
Waveband Type)
1.2 The devices covered by this test method are referred to
E2758 Guide for Selection and Use of Wideband, Low
as infrared thermometers in this document.
Temperature Infrared Thermometers
1.3 The infrared thermometers covered in this test method
are instruments that are intended to measure temperatures 3. Terminology
below 1000°C, measure thermal radiation over a wide band-
3.1 Definitions of Terms Specific to This Standard:
width in the infrared region, and are direct-reading in tempera-
3.1.1 cavity bottom, n—the portion of the cavity radiation
ture.
source forming the end of the cavity.
1.4 This guide covers best practice in calibrating infrared 3.1.1.1 Discussion—The cavity bottom is the primary area
where an infrared thermometer being calibrated measures
thermometers. It addresses concerns that will help the user
perform more accurate calibrations. It also provides a structure radiation.
for calculation of uncertainties and reporting of calibration
3.1.2 cavity radiation source, n—a concave shaped geom-
results to include uncertainty.
etry approximating a perfect blackbody of controlled tempera-
ture and defined emissivity used for calibration of radiation
1.5 Details on the design and construction of infrared
thermometers.
thermometers are not covered in this test method.
3.1.2.1 Discussion—Acavity radiation source is a subset of
1.6 This test method does not cover infrared thermometry
thermal radiation sources.
above 1000°C. It does not address the use of narrowband
3.1.2.2 Discussion—To be a cavity radiation source of
infrared thermometers or infrared thermometers that do not
practicalvalueforcalibration,atleast90 %ofthefield-of-view
indicate temperature directly.
of a radiation thermometer is expected to be incident on the
cavity bottom. In addition, the ratio of the length of the cavity
1.7 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information versus the cavity diameter is expected to be greater than or
equal to 5:1.
only.
3.1.3 cavity walls, n—the inside surfaces of the concave
1.8 The values stated in inch-pound units are to be regarded
shape forming a cavity radiation source.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.1.4 customer, n—the individual or institution to whom the
and are not considered standard.
calibration or accuracy verification is being provided.
3.1.5 distance-to-size ratio (D:S), n—see field-of-view.
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ThispracticeisunderthejurisdictionofASTMCommitteeE20onTemperature
Measurement and is the direct responsibility of Subcommittee E20.02 on Radiation
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Thermometry. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedMay1,2013.PublishedJuly2013.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 2011. Last previous edition approved in 2011 as E2847–11. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
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E2847–13 . the ASTM website.
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E2847−13
3.1.6 effective emissivity, n—the ratio of the amount of 5. Significance and Use
energy over a given spectral band exiting a thermal radiation
5.1 This guide provides guidelines and basic test methods
source to that predicted by Planck’s Law at a given tempera-
for the accuracy verification of infrared thermometers. It
ture.
includes test set-up and calculation of uncertainties. It is
3.1.7 field-of-view, n—a usually circular, flat surface of a
intended to provide the user with a consistent method, while
measured object from which the radiation thermometer re-
remaining flexible in the choice of calibration equipment. It is
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ceives radiation
...