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10-29-2019

Inline Inspector Detects Voids

Using Thermography to Identify Concealed Holes and Gaps

The HVI “Hole and Void Inspector” by EVT Eye Vision Technology GmbH, Karlsruhe, Germany, can find concealed holes and gaps in diverse plastics, such as foamed materials, glass fiber-reinforced plastics, rubber, and other materials. For this purpose, the device makes use of active thermography, i.e. it emits thermal energy, such as in a high-power flash. When the material is monitored as it cools, the gaps can be identified due to the fact that their coefficient of thermal conduction differs from that of the surrounding material.

  • Hole and Void Inspector: the HVI system consists of the computer, thermal imaging camera and software to detect voids and holes (© EVT)

  • Process mode of the Thermo software detecting concealed holes in metal or wooden material after active heat input (© EVT)

  • A red overlay indicates errors (© EVT)

  • Comparison of images: there is only one hole to be seen without heat input, but also the concealed holes after heat input (© EVT)

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Different zones can be determined thanks to a series of images captured during the cooling process. As the device manufacturer states, this also functions in exothermal production processes, e.g. when foaming plastics. In this procedure, it is not necessary to heat the plastic; it is sufficient to capture images of the material after production with the thermal imaging camera.

In-Line Operation Mode

The HVI device is embedded into a machine via two interfaces. These include, first, two autonomous GigE camera interfaces, in which up to four thermal imaging cameras can be connected and controlled, and then another two interfaces – one for a field bus, such as Profinet, Modbus- and one to integrate the device into a Scada system. This way, the equipment can control the thermal analysis process, and, depending on the results, discharge the products. At the same time, it is also possible to automatically send the test results along with the thermographic images within the company, for instance to the Quality Assurance department.

The user can run the HVI either with a display for error visualization or “headless“, sending test results (and, on demand, the analysis images) to a host computer or a browser via integrated web server.

Company profile

EVT Eye Vision Technology GmbH

Gartenstraße 26
DE 76133 Karlsruhe
Tel.: 0721 66800423-0
Fax: 0721 62690596

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