edevis® - Thermography -

edevis® - Thermography -

http://www.edevis.com/en/active_thermography.php[1/27/2014 4:10:11 PM]

Set-up of a non-destructive test system based on activethermography

Passive ThermographyThe objective of conventional thermography is the measurementof surface temperatures. The thermography system detects the,of a body emitted, temperature dependent infrared heatradiation. Using the so-called passive thermography, one canget contactless information about the surface. Nowadays, withhigh-resolution thermography systems, it is possible to detecttemperature differences of 10 mK.

Automated process controlMany processes which involve temperature changes or heat fluxcan be observed and controlled with an infrared camera. Thiscan be an exotherm process revealing heat during production,or samples which should reach or should not exceed a certaintemperature. Such a process can be for instance the functionalcontrol of a seat heater for automotive application. With theedevis image processing system QTvis such an automated testand evaluation is an easy and cost efficient task.

Active ThermographyActive thermal measurement methods are based on theevaluation of a previously excited heat flow in the testedcomponent and its disturbance by hidden defects. The heat flowis generated with a heat pulse or through sinusoidal modulation.The testing is carried out with a thermography camera followedby a mathematical analysis of the measured sequence to extractthe for a reliable defect detection necessary information.

Lockin ThermographyLock-In Thermography is a method to significantly increase thesignal-to-noise ratio for active thermography applications. Theheat flux hereby is being analyzed, and the time delay of heatflux is displayed thus revealing important material properties orflaws.

Excitation methods for active thermographyThe thermography methods listed below are well established innondestructive testing of materials:OTvis - optically excited lock-in thermographyPTvis - pulse thermographyLTvis - Laser excited thermographyITvis - induction thermographyUTvis - ultrasound excited thermography (vibrothermography)

Active thermography for non-destructive testing applications

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Home Thermography Shearography Photothermal Services Applications

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http://www.edevis.com/en/laser_thermography.php

http://www.edevis.com/en/induction_thermography.php

http://www.edevis.com/en/vibro_thermography.php

http://www.edevis.com/en/thermography_process_control.php

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