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ASTM E1311-14(2022)

Current Reaffirmation

Standard Practice for Minimum Detectable Temperature Difference for Thermal Imaging Systems

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1.1 This practice covers the determination of the minimum detectable temperature difference (MDTD) capability of a compound observer-thermal imaging system as a function of the angle subtended by the target.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 This practice gives a measure of a thermal imaging system's effectiveness for detecting a small spot within a large background. Thus, it relates to the detection of small material defects such as voids, pits, cracks, inclusions, and occlusions.

5.2 MDTD values provide estimates of detection capability that may be used to compare one system with another. (Lower MDTD values indicate better detection capability.)

5.3 Due to the partially subjective nature of the procedure, repeatability and reproducibility are apt to be poor and MDTD differences less than 0.2 °C are considered to be insignificant.

Note 2: Values obtained under idealized laboratory conditions may or may not correlate directly with service performance.

SDO ASTM: ASTM International
Document Number E1311
Publication Date Dec. 1, 2022
Language en - English
Page Count 3
Revision Level 14(2022)
Supercedes
Committee E07.10
Publish Date Document Id Type View
Oct. 1, 2014 E1311-14 Revision
Dec. 1, 2022 E1311-14R22 Reaffirmation
Nov. 1, 2018 E1311-14R18 Reaffirmation
June 1, 2010 E1311-89R10 Reaffirmation
May 1, 2004 E1311-89R04 Reaffirmation
June 10, 1999 E1311-89R99 Reaffirmation