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Standard Test Method for Thermal Diffusivity by the Flash Method
This standard is issued under the fixed designation E 1461; 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
super epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the determination of the thermal
diffusivity of primarily homogeneous isotropic solid materials.
Thermal diffusivity values ranging from 10-7 to 10-3 m2/s are
readily measurable by this test method from about 75 to
2800 K.
1.2 This test method is a more detailed form of Test Method
C 714, but has applicability to much wider ranges of materials,
applications, and temperatures, with improved accuracy of
measurements.
1.3 This test method is applicable to the measurements
performed on materials opaque to the spectrum of the energy
pulse, but with special precautions can be used on fully or
partially transparent materials (see Appendix X1).
1.4 This test method is intended to allow a wide variety of
apparatus designs. It is not practical in a test method of this
type to establish details of construction and procedures to cover
all contingencies that might offer difficulties to a person
without pertinent technical knowledge, or to stop or restrict
research and development for improvements in the basic
technique.
1.5 This test method is applicable to the measurements
performed on essentially fully dense materials; however, in
some cases it has shown to produce acceptable results when
used with porous samples. Since the magnitude of porosity,
pore shapes, sizes and parameters of pore distribution influence
the behavior of the thermal diffusivity, extreme caution must be
exercised when analyzing data. Special caution is advised
when other properties, such as thermal conductivity, are
derived from thermal diffusivity obtained by this method.
1.6 This test method can be considered an absolute (or
primary) method of measurement, since no reference standards
are required. It is advisable to use reference materials to verify
the performance of the instrument used.