Electronic Components Inspection

This example describes the inspection of precision resistors. With this component, a resistance wire is applied to a ceramic substrate in a meander shape. The aim of the quality control is to check whether the wire has defects or breaks. To do this, the resistor is pulsed with a pulse current for a short time (a few ms), with a thermal image being taken at an exactly defined point in time after the current pulse has been applied. Defects are clearly identifiable in the image: if the wire has breaks, there will be no warming. Defects in the wire lead to localised temperature increases (hot spots). The thermal image is analysed in a fully automatic process using the IrControl software, giving out a “good” or “bad” signal as appropriate.

It is precisely in the inspection of electronic components and modules that the strengths of the IrControl software package are revealed in relation to the implementation of fully automatic measuring processes with automatic data archiving, pixelwise emissivity adjustment and differential-image analysis.