ASTM E1897-97

Standard Test Methods for Measuring and Compensating for Transmittance of an Attenuating Medium Using Infrared Imaging Radiometers

SCOPE
1.1 These test methods cover procedures for measuring and compensating for transmittance when using an infrared imaging radiometer to measure the temperature of a specimen through an attenuating medium, such as a window, filter or atmosphere.  
1.2 The values stated in SI units are to be regarded as the standard.  
1.3 These test methods may involve use of equipment and materials in the presence of heated or electrically-energized equipment, or both.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jul-1997
• Technical Committee: E07 - Nondestructive Testing
• Drafting Committee: E07.10 - Specialized NDT Methods

Relations

• Replaced By: ASTM E1897-97(2002)e1 - Standard Test Methods for Measuring and Compensating for Transmittance of an Attenuating Medium Using Infrared Imaging Radiometers
• Effective Date: 10-Jul-1997

Standards Content (Sample)

Designation: E 1897 – 97
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Methods for
Measuring and Compensating for Transmittance of an
1
Attenuating Medium Using Infrared Imaging Radiometers
This standard is issued under the fixed designation E 1897; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.6 window—a semi-transparent material that separates
conditioned and unconditioned atmospheres and attenuates
1.1 These test methods cover procedures for measuring and
certain wavelengths of radiation.
compensating for transmittance when using an infrared imag-
3.2 See also Terminology E 1316.
ing radiometer to measure the temperature of a specimen
through an attenuating medium, such as a window, filter or
4. Summary of Test Method
2
atmosphere.
4.1 Using the computer built into an infrared imaging
1.2 The values stated in SI units are to be regarded as the
radiometer, a method is given for measuring the transmittance
standard.
of an attenuating medium.
1.3 These test methods may involve use of equipment and
4.2 Using the computer built into an infrared imaging
materials in the presence of heated or electrically-energized
radiometer, a method is given for compensating for errors
equipment, or both.
when measuring the temperature of a specimen through an
1.4 This standard does not purport to address all of the
attenuating medium when the emissivity of the specimen and
safety concerns, if any, associated with its use. It is the
the transmittance of the attenuating medium are known.
responsibility of the user of this standard to establish appro-
4.3 Using the computer built into an infrared imaging
priate safety and health practices and determine the applica-
radiometer, a method is given for measuring and compensating
bility of regulatory limitations prior to use.
for unknown transmittance and emissivity errors when the
2. Referenced Documents specimen temperature is known.
2.1 ASTM Standards:
5. Significance and Use
3
E 1316 Terminology for Nondestructive Examinations
5.1 The transmittance of an attenuating medium can cause
3. Terminology errors for an infrared thermographer using an infrared imaging
radiometer to measure the temperature of a specimen through
3.1 Definitions of Terms Specific to This Standard:
the medium. Three test methods are given for measuring and
3.1.1 attenuating medium—a semi-transparent solid, liquid
compensating for this error source.
or gas, such as a window, filter, external optics and/or an
5.1.1 A test method is given for measuring the transmittance
atmosphere that attenuates radiation.
of an attenuating medium.
3.1.2 blackbody simulator—a device with an emissivity
5.1.2 A test method is given for compensating for errors
close to 1.00 that can be heated or cooled to a stable
when measuring the temperature of a specimen having a
temperature.
known emissivity through an attenuating medium with a
3.1.3 filter—a semi-transparent material that attenuates cer-
known transmittance.
tain wavelengths of radiation.
5.1.3 A test method is given for measuring and compensat-
3.1.4 infrared thermographer—the person using an infrared
ing for transmittance and emissivity errors when the specimen
imaging radiometer.
temperature is known.
3.1.5 reflected temperature—the temperature of the energy
5.2 These test methods can be used in the field or laboratory
incident upon and reflected by the measurement surface of the
using commonly available materials.
specimen.
5.3 These test methods can be used with any infrared
radiometers that have the required computer capabilities.
1
These test methods are under the jurisdiction of ASTM Committee E-07 on
Nondestructive Testing and is the direct responsibility of Subcommittee E07.10 on
6. Interferences
Emerging NDT Methods.
Current edition approved July 10, 1997. Published December 1997. 6.1 Test Method for Measuring the Transmittance of an
2
These test methods are adapted from the Guideline of Measuring and
Attenuating Medium:
Compensating for Reflected Temperature, Emittance and Transmittance developed
6.1.1 This test method requires a blackbody simulator with
by Infraspection Institute, 1971 Shelburne Road, Shelburne, VT 05482, 1993.
3
an emissivity of 0.95 or greater that is at least 20°C warmer
Annual Book of ASTM Standards, Vol 03.03.
1

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E 1897
than ambient temperature. Potential errors can be minimized isotherm) to measure and compensate for the reflected tem-
by ensuring the stability of the temperature difference between perature error incident upon the blackbody simulator.
the source and the ambient temperature during the test
...