Air-coupled Ultrasonic Testing - Air-coupled Ultrasonic Testing Advantages Air-coupled, contactless,

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  • Air-coupled Ultrasonic Testing


    Air-coupled, contactless, couplant free

    Inspection of highly attenuating materials

    High resolution due to the use of focusing transducers


    Interface detection

    Bond inspection and homogeneity analysis

    Delamination testing etc.

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    Due to the smaller impedance differences to the air, air-coupled ultrasonic testing works, physically and practically, in most cases better on plastic and composite components than on metallic materials. In addition, there are often no established or at least no efficient test methods for plastic and composite components, since their material- or production-dependent properties often do not allow contact with liquid coupling agent or are at least highly disadvantageous. This does not fundamentally exclude metallic materials for air-coupled ultrasonic testing, but clearly puts the focus on:

    Plastic and composite components such as carbon or glass fiber reinforced plastics (CFRP and GFRP)

    Honeycomb structures with different core and top layer materials

    Rubber, foams, etc.

    Ceramic and concrete materials


    Typical flaws include all types of volume defects such as delamination, in particular kissing bonds in the case of bonded materials, dry / non-wetted fibers, and cracks and inclusions of air or foreign matters. The advantage of air-coupled ultrasonic testing is that defects can not only be detected, but in some cases a certain degree of the error can be determined.

    The smallest detectable flaw size is currently around 1.00 mm for isolated individual errors. However, previous investigations have already succeeded in finding significantly smaller errors. The size of the defects that can be detected and the transmission capability differ widely and depend in particular on the material dimensions, the type of defect and the properties of the material. A general statement cannot be made in most cases. In any case, it is important to carry out a preliminary examination or a feasibility study.


    Technical Data

    General Data

    19'' unit consisting of PC with Windows 8.1 and system software SONOSTUDIO; Digitizer 16 Bit, 100 MS/s; Transmitter unit; Receiver unit

  • Operating frequency 35 to 750 kHz (on the transmitter's side optional up to 3 MHz)

    Operating temperature 5 to 40°C

    Network interface 1 GBit/s LAN

    Protection class IP20

    Standards DIN EN 601010, DIN EN 60204


    Number of channels 1 - 4 channels (scalable)

    Pulse height of the output signals Up to 400 V (optional up to 800 V)

    Maximum power 2 kW (400 V), 4 kW (800 V)

    CW operation Possible

    Square wave burst transmitter Freely configurable (the pulse width can be selected individually for every square wave pulse of the burst)


    Number of channels 1 - 4 channels (scalable)

    Gain 0 to 120 dB (0.5 dB increment)

    Noise 1nV/√Hz


    Scanning area (X x Y x Z) 500 x 500 x 160 mm

    Positioning accuracy 20 μm

    Scanning increment Minimum 50 μm

    Probes SONOSCAN CF series with robust stainless steel housing

    Frequency Range 50 kHz to 400 kHz

    Relative sensitivity Up to -30 dB

    Focusing Permanent focus with shaped lens or electronically adaptable focus with multi channel Fresnel zone design

  • Software

    Display of the measurement results as A-, B-, C- or D-Scan

    Storage of the complete A-scans for every measurement point during the testing process

    Repositioning of the measurement gates after the inspection

    Individual signal processing algorithms (e.g. for filters)


    Type Title Size

    SONOAIR Flyer 765 KB


  • Please contact us! We will be glad to help you.

    Manuel Lucas +49 (0)345 / 133 17-846