Active Thermography - A Guide to Varying Methods

Various techniques of active thermography such as Pulse Phase Thermography and Lock-In Thermography are imaging procedures that perfectly suit for contact-free and non-destructive material testing. With regards to high-resolution infrared cameras, they allow for fast detection of material defects and pave the way for new possibilities in research, development and quality assurance.

ImageIR ® with notebook

Active thermography - ImageIR ® with notebook

Professional modul

Active thermography - Professional modul

Universal modul

Active thermography - Universal modul

Control module

Active thermography - Control module

Active thermography in automotive industry

Active thermography in automotive industry

Details about Active Thermography

Active Thermography for Non-Destructive Material Testing

Active thermography is the induction of a heat flow by energetically exciting a test object. The heat flow is impacted by interior material layers and defects. These inhomogeneities can be captured on the surface using high-precision infrared cameras. The extra application of different assessment algorithms enhances the signal-to-noise-ratio which allows for detection of the smallest defects.

Active thermography for aircraft engineering

Active thermography for aircraft engineering

Modular System Design for Precisely Fitting Inspections

The versatile application options of active thermography require an intricate configuration of every single inspection system. InfraTec offers a wide range of essential components together with a modular system architecture. The high-resolution infrared cameras, efficient control and assessment software as well as the continuously operable excitation sources and controllers are interchangeable within the system and thus allow a flexible adaptation of future requirements.

Infrared Cameras with Highest Precision

Cooled high-end infrared cameras with rapid photon detectors of the ImageIR® series and non-cooled microbolometer cameras of the newest VarioCAM® High Definition generation are employed for active thermography. Geometrical resolutions of up to 1.920 x 1.536 IR pixels and thermal resolutions much below 0.015 K are a precise technical foundation for the detection of the smallest material defects. High image acquisition frequencies allow for measurements of materials with high heat conductivity, such as metals. InfraTec also offers a wide assortment of lenses and optics to image large test objects and microscopic structures.

Active thermography

Active thermography

Defect-Specific Excitation Sources and Controllers

Different types of defects of numerous materials can be detected by utilizing specific energetic excitation units. InfraTec picks the suiting excitation source, such as high-performance flashes, hot and cold air blowers, inductive units and homogeneous halogen radiators for the particular test situation.

Efficient Control and Analysis Software for Active Thermography

The thermography software IRBIS® 3 active examines the thermo-graphic sequences, which have been produced during the test, and edits them to produce a false color image, in which defects can be marked for additional documentation or evaluation. For this purpose, several different analysis processes are available. The selection of the right algorithm depends on the geometry, material characteristics and type of defects to be detected.

Active thermography software IRBIS 3

Active thermography software IRBIS 3

While the quotient technique examines the heat flow of the test object by reference to the decrease and increase of the surface temperature, the pulse-phase thermography (PPT) depends on the analysis of the temperature profile of various frequencies. For each frequency, two event images are produced, one amplitude and one phase image. The lock-in thermography (LIT) examines the sequence of periodic excitation of the test object.

Applications of Active Thermography

Active thermography is applied in a majority of diverse manufacturing technologies for both offline testing and inline testing of series production.

  • Investigation of interior structures or impacts on honeycomb lightweight constructions
  • Detection of delaminations, layer structures, and inserts in plastics
  • Detection in CFRPs of the aerospace and automotive industry
  • Recognition of deeper material deficiencies, such as ruptured laser welding seams or blowholes in plastic parts

Active thermography photovoltaics

Active thermography photovoltaics

InfraTec GmbH

This information has been sourced, reviewed and adapted from materials provided by InfraTec GmbH.

For more information on this source, please visit InfraTec GmbH.

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