Here we show a few typical instruments for microwave testing. They are to be applied for the inspection of parts made from dielectric, i.e. electrically non-conducting materials. These instruments often are adapted in an application-specific manner.
Hand-held Scanner FHS
The hand-held scanner FHS1 is used for the non-destructive testing of parts which are electrically non-conducting. It consists of a scan module and a laptop as control and display module. Between both modules there is a wireless communication via Bluetooth. The scan module is fixed on the surface of the device under test by vacuum suction cups. The sensor can be guided by hand across an area of about 300 mm x 300 mm. Then a planar image of the reflection coefficient develops which shows the distribution of inhomogeneities under the surface of the device.
Hand-held scanner FHS1 used to test an absorber tower of a refinery
Test Instrument FMH
The FMH allows for non-destructive testing of parts made from electrically non-conducting materials. These include
- glass-fibre reinforced plastics GFRP
- natural-fibre reinforce plastics NFRP
and composites based on these materials.
The FMH is a stand-alone instrument. It includes a microwave module as well as a control and display module. Therefore, in basic functions it can be used without additional instruments. For detailed user-specific evaluations and for the documentation of test results an analogue interface, and, as an option, an interface to an eddy current system are available.
The FMH uses low power microwaves. For optimum spatial resolution and optimum observation depth various applicators (antennas) are available.
The FMH is a test instrument for use
- as a handheld device
- in a fixed position
- installed in moving scan equipment
Eddy Current Adapter FVG
Eddy current testing is used to inspect metallic parts. The Eddy Current Adapter FVG extends the usability of eddy current inspection systems such that they can also be used to detect defects in insulating parts.
The adapter uses a frequency of 24 GHz with which the part is inspected. The eddy current system perceives the adapter like an eddy current sensor. In this way the control and evaluation functions of the eddy current system can be used.
The adapter is an inspection tool with microwave head
- for stationary use
- for use in scanning systems
Eddy Current Adapter FVG for a MAUS system
User-specific test systems, integrated in production lines, for the detection of defects in parts made from non-conducting material like plastics, glass fibre reinforced plastic, wood, ceramic etc.
Inspection system for automobile leaf springs made from glass fiber reinforced plastic (CFRP), see N23e.