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.
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.
EVT Eye Vision Technology GmbH
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