ISO 10878:2013 pdf download.Non-destructive testing — Infrared thermography — Vocabulary.
1 .1 absorptivity
absorptance
absorptance coefficient proportion (as a fraction of 1 ) of the radiant energy impinging on a material’s surface that is absorbed by the material
NOTE 1 Absorptivity is dimensionless.
NOTE 2 For a blackbody, this is unity (1 ,0). Technically, absorptivity is the internal absorptance per path length. In thermography, the two terms, absorptivity and absorptance, are often used interchangeably.
NOTE 3 Absorptance is the ratio between the radiation energy absorbed by a body and the total radiation incident on the body.
NOTE 4 Absorptivity can vary with wavelength and be quoted for a specified band width or a specific wavelength. See 1 .1 36, Spectral absorption coefficient.
1 .2 active thermography
infrared thermographic examination of materials and objects which requires additional thermal stimulation
NOTE The thermal stimulation can be optical, sonic (ultrasonic), inductive, microwave or use any other form of energy.
1 .3 ambient operating range
range of ambient temperatures over which an instrument is designed to operate within reported performance specifications
1 .4 ambient temperature
temperature of the air in the vicinity of a test object (target)
NOTE “Ambient temperature” is not to be confused with “reflected ambient temperature”, which is a term often used to mean “reflected apparent temperature”.
1 .5 ambient temperature compensation
correction built into infrared instruments to provide automatic compensation of temperature readings affected by the ambient temperature
1 .6
angular subtense
angular diameter of an optical system or subsystem
NOTE 1 Angular subtense is expressed in angular degrees or milliradians.
NOTE 2 In infrared thermography, the angle over which a sensing instrument collects radiant energy.
1 .7anomalous thermal image
observed thermal pattern of a structure that is not in accordance with the expected (reference) thermal pattern
1 .8anomaly
irregularity or abnormality in a system EXAMPLE An irregularity, such as an anomalous thermal pattern or any indication that deviates from what is normally
expected in the absence of any anomaly.
1 .9anti-reflectance coating
coating of infrared optical elements (lenses, windows) used to increase the sensitivity of a specified wavelength range through minimization or suppression of reflections causing signal loss
1 .1 0apparent temperature
uncompensated reading from an infrared thermography camera containing all radiation incident on the detector, regardless of its source
[ISO 1 8434-1 :2008 [6] , 3.1 ]
1 .1 1area effect
change in infrared radiometer output depending on the area of the measuring target
1 .1 2artefact
1 product of artificial character due to an extraneous agency
2 error caused by an uncompensated anomaly
EXAMPLE In thermography, an emissivity artefact simulates apparent variation of surface temperature.
1 .1 3atmospheric absorption
absorption of specific wavelengths of solar radiation, due largely to moisture, atmospheric gases and pollutants
1 .1 4 atmospheric temperature
temperature of the atmosphere between the infrared camera and the object
1 .1 5 atmospheric window
infrared any spectral interval within the infrared spectrum in which the atmosphere transmits radiant energy well (atmospheric absorption is minimal)
EXAMPLE Atmospheric windows are roughly defined to lie in the wavelength ranges:
a) 0,78 µm to 2,0 µm in the near infrared (NIR);
b) 2,0 µm to 5,5 µm in the mid-wave infrared (MWIR);
c) 7,5 µm to 14,0 µm in the long-wave infrared (LWIR).
1 .1 6 attenuating medium
material or other medium that attenuates infrared radiation emitted from a source
EXAMPLE Attenuating media include windows, filters, atmospheres, external optics.
1 .1 7 blackbody
ideal perfect emitter and absorber of thermal radiation at all wavelengths
NOTE A blackbody is described by Planck’s law. In its classical form, Planck’s law describes the spectral distribution of the radiant energy emitted by a blackbody.
1 .1 7.1 blackbody equivalent temperature
apparent temperature of a test object that is equal to the temperature of a blackbody emitting the same amount of radiant energy
1 .1 7.2 blackbody radiator
radiator with the effective emissivity close to unity ( 0,98 across all relevant wavelengths)
1 .1 7.3 blackbody reference
calibrated, traceable device used to check the calibration of infrared imaging radiometers or infrared thermometers
1 .1 7.4 blackbody simulator
device whose radiation is close to that of a blackbody at the same temperature.ISO 10878 pdf download.ISO 10878-2013 pdf download
