LTvis

Active thermography with adaptable laser excitation

LTvis is edevis modular testing concept for non-destructive material inspection using laser thermography. By selecting the appropriate Laser source – diode or fiber inspections can be precisely adapted to the material, geometry, and type of defect. From full-surface inspection to high-resolution detection of the finest defects, LTvis offers maximum flexibility and precision.

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Laserthermografie im Einsatz bei einer Schweißnaht

Applications

Inspection of welds and solder joints
Detection of cracks, delaminations, and inclusions
Coating thickness and hardness testing
Grinding burn inspection
Testing of CFRP, aluminum, copper, and steel
Defect detection on complex geometries

Advantages of LTvis

Flexible configuration through selectable laser source
Suitable for various materials and defect types
High depth resolution & thermal sensitivity
Automatable & inline-capable
Proven edevis platform with unified software architecture

Thermographic image of a weld seam to detect irregularities and defects

How does inspection with LTvis work?

LTvis is based on the principle of active thermography. A precise laser beam locally heats the component – spotwise, line-shaped, or across a surface, depending on the requirement. Defects disrupt the resulting heat flow inside the material. These disturbances are visualized by an infrared camera and automatically analyzed by the edevis software.

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Typical procedure of an LTvis inspection

1. Thermal excitation via laser beam

Diode or fiber lasers generate targeted thermal pulses on the component surface. The type of laser is selected based on the material properties and inspection requirements.

2. Heat flow within the material

The heat flow initially spreads uniformly – until it is disrupted by cracks, delaminations, or voids. These disruptions cause temperature variations on the surface, which can be precisely detected.

3. Detection via infrared camera

A high-resolution IR camera detects these anomalies in real time – even the smallest defects become visible and are documented.

4. Software-assisted analysis

Image analysis is performed automatically using DisplayImg – including phase image visualization, defect detection, and reporting.

Specifications

Diode laser

Wavelength approx. 940 nm

Power up to 2000 W

Beam profile: homogeneous (top-hat)

Ideal for: area-wide heating, grinding burn, coating thickness, near-surface defects

Fiber laser

Wavelength approx. 1064 nm

Power up to 500 W

Beam profile: Gaussian (focused)

Ideal for: fine cracks, deeper defects, high resolution

1D vs. 2D/3D heat flow

- 1D heat flow (diode laser): Planar, vertical heat propagation without movement

- 2D/3D heat flow (fiber laser): Spot or line excitation with lateral heat propagation and scanner operation

Modular System

LTvis consists of:
- LTvis excitation source and optics; choice of diode or fiber Laser
- Software module for Laser control
- Laser optics/scanner (optional)
- Laser safety cabin (optional)
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Required components:
- Fast IR camera with MWIR detector
- ESG signal generator
- edevis software DisplayImg
- Test bench/handling system (optional, for automated testing)

The system can be used for both laboratory testing and automated inline setups.