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94 GHz radar sensor for process control and imaging
A frequency modulated continuous wave (FMCW) radar sensor whose heart is a Monolithic Millimetre wave Integrated Circuit (MMIC) working at approx. 94 GHz has been used for both process control and imaging for different purposes. The radar sensor has been tested in the area of gas-assisted injection moulding processes for production of plastics parts and components. By means of waveguides and a window which is transparent for millimetre waves the waves are
guided into the cavity to be filled with liquid plastics. The appearance of a gas bubble changes the wave pattern inside the cavity. Thus, the process sequence can be controlled in a quick and direct way.