Testing of Carbon Fiber Fabrics, Preforms
and Composites by EddyCus® CF Series

The technology is especially designed for non-destructive and non-contact evaluation of carbon fiber materials without the use of coupling media. The NDT is applicable to both composites and dry carbon fiber fabrics. Three main cases are:

  • Analyzing structural parameters of hidden CF layers
  • Identifying defects & effects in CF stacks
  • Determining local grammage of CF fabrics without contact


More about the innovative NDT for Carbon Fibers

Quality Assurance For Carbon Fibers

Inline Roll-to-Roll Testing

Online monitoring of carbon fiber textile production helps to identify the fiber orientation and fiber distribution of inner carbon fiber layers, detect gaps and undulation in non-crimp-fabrics. It enables carbon tow and hybrid-yarn testing and also isotropy monitoring of chopped, recycled carbon fiber mat and non-woven.

Laboratory Testing

Laboratory testing means non-destructive offline testing in laboratory. The fiber areal weight, isotropy and prevalent fiber direction can be measured.„ It is also possible to map alignment and fiber distribution, wrinkles & overlaps for flat specimen.

Automated Testing

For complex 3D components we offer an OEM integration kit that can be attached to the robot arm as flexible, automatable solution. There is also a rotation sensor for portable and hand-moved arms.

Advantage of Eddy Current Devices

Depending on the K-value of the roving the percentage of inner filaments raises. The higher the K-value, the higher is the percentage of the inner filaments. At the inside of a 12 K roving are about 87 percent of all filaments. It is a huge problem to see inner defects of a roving.

For inline monitoring a fast measurement speed is essential. Optical and eddy current systems are fast enought for inline measurement. But only eddy current measurement systems are able to detect inner defects. By using a camera systems, 87 percent of the defects are unnoticed.

- the eddy current procedure can also detect the conductivity of the carbon roving

- detect the quality of different layers by layers with different angles


  Advantages Limits Feasible for

Sensitive detection of delamination
Macro cracks
Strong penetration depth
Accredited method in aviation

Mostly requires coupling media
Micro cracks not detectable
Manual effort
Complex geometry

After consolidation: Mechanical processing


X-Ray, CT

Sensitive to inclusion, porosity
Strong penetration depth

Slow areal scan
Safety concerns


Less complex

No inner defects
Only surface
Complex geometry

All, but limited to surface


Only (sub)-surface
Thin walls
Complex curved geometry

After consolidation: Mechanical processing


Eddy Current

Fibre orientation
No coupling media

No micro cracks
Several plies only
Less sharp images
Complex geometry

All, particular well for fabrics

Complex geometry


Mainly after consolidation

Except lock-in thermography


Carbon Fiber Testing Equipment

EddyCus® CF inline Series

Fabrics manufacturers and equipment suppliers apply the EddyCus® CF inline for offline mapping and inline monitoring of the basis weight of carbon fabrics. Reasons are the non-contact, small-scale and flexible setups for online process control. This is particularly relevant for UD-tapes or multi-axial fabrics and carbon fiber fleece. It has also potential to characterize the quality of recycled fibers.

EddyCus® CF lab & map Series

The automotive and aerospace industry are using the EddyCus® CF map 5050 to perform spot-check inspection and process optimization of dry preforms or cured CFRP parts. The quick test at regions of interest allows the companies to check quality specifications at critical locations. Rather than classical NDT methods, the novel electrical method allows to focus on defects in the fiber structure, e.g. misalignment, wrinkles, or distortion can, therefore, be avoided.

EddyCus® CF rob & OEM Kit

The testing system utilizes the electrical conductivity of the carbon fibers togain structural information about the form; for instance, information on fiber orientation and fiber distribution. The high resolution EC- scans also enable defect detection, e.g. gaps, misalignment, wrinkles, overlaps, and even impurities, cracks and delamination. The EddyCus® system can be used at any stage in the production process: for carbon fiber textiles, stacks, preforms or composites. Both basic flat but also curved parts or preforms can be checked by the flexible robotic solution. Therefore, the system particularly helps process engineers or R&D focused groups to evaluate the results of individual production steps.