Air-coupled ultrasonic testing

SONOAIR R&D - Air-coupled ultrasonic inspection (foam)SONOAIR R&D - Air-coupled ultrasonic inspection with multichannel capabilitySONOAIR R&D - SONOAIR R&D - Air-coupled ultrasonic inspection - Transmission[SONOWARE C-Scan -SONOAIR R&D - Air-coupled ultrasonic inspection (Impact damage)SONOWARE C-Scan - SONOAIR R&D - Air-coupled ultrasonic inspection (honey comb)SONOWARE C-Scan -SONOAIR R&D - Air-coupled ultrasonic inspection (PMMA sheets bonding)
SONOAIR R&D - Air-coupled ultrasonic inspection (foam)SONOAIR R&D - Air-coupled ultrasonic inspection with multichannel capabilitySONOAIR R&D - SONOAIR R&D - Air-coupled ultrasonic inspection - Transmission[SONOWARE C-Scan -SONOAIR R&D - Air-coupled ultrasonic inspection (Impact damage)SONOWARE C-Scan - SONOAIR R&D - Air-coupled ultrasonic inspection (honey comb)SONOWARE C-Scan -SONOAIR R&D - Air-coupled ultrasonic inspection (PMMA sheets bonding)

Advantages

  • Non-contact ultrasonic testing method
  • Perfect for ultra-modern fibre-plastic composites (CFRP and GFRP)
  • Maximum resolution at high sensitivity due to focusing probes

 

Applications

  • Interface detection
  • Detection of inhomogeneities
  • Scan of large surface defects such as delamination

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Air-coupled ultrasonic testing with SONOAIR® R&D

SONOAIR® R&D allows free configuration of the transmitter characteristics with a voltage of up to 800 V. By combining a preamplifier at the receiver and a power amplifier in the system, the system achieves an extremely low inherent noise of < 1 nV / √Hz.

The amplifier dynamics of 120 dB enables a very good signal-to-noise ratio (SNR), even with highly attenuating materials, to generate a clear and reproducible measurement result.

The principle of air-coupled ultrasonic testing

Measuring method

Transmission

Air-coupled ultrasonic testing in transmission is the ideal measuring method for detecting the most common defects in modern multilayer composites. These include delamination, air inclusions, kissing bonds and impact damage.

By using air as a coupling agent, small defects can also be detected with ultrasound. With a wavelength of 0.85 mm and an appropriate scanning grid, defects from approx. 1 mm in size can be detected.

SONOAIR® R&D technology also enables measurements of highly attenuating materials that would be difficult or impossible to test with water-coupled ultrasonic testing. These include foams, composites, ceramics, wood, concrete and honeycomb structures. In addition, ultra-modern fibre-plastic composites (CFRP and GFRP) can be tested for defects of the same size as with conventional ultrasonic testing methods.

Software - SONOWARE Basic / Advanced

SONOAIR® R&D offers the possibility to display the measurement result via A-/C- or D-scan and to export the raw data of the measurement results. In the C-scan displayed below, the maximum amplitudes of all individual measurements (A-scans) are summarized in color-coded form. The smallest detectable defect size and the sound transmission capability depend in particular on the material dimensions, the expected defect type, the test frequency as well as the selected measurement resolution and scanning speed. The example scans were recorded with a resolution of 1 x 1 mm at an inspection speed of 100 mm / s. 

Measurement results (C-Scans)

C-Scan of bonding of 2 plastic sheets

Test method: Transmission
Type of defect: Air inclusions and incomplete adhesive adhesion
Probe: CF400
Defect size: min. Ø 2mm

C-Scan of a battery

Test method: Transmission
Fault type: Impact damage and delaminated top layer
Probe: CFC230_D25_P65

C-Scan of a honey comb

Test method: Transmission
Types of defects: Impact damage and delaminated top layer
Probe: CFC230_D25_P65

C-Scan of ceramic valves

Test method: Transmission
Types of defects: Delamination and density fluctuations before and after the sintering process
Probes: CF075 and CF125

Technical data

General data
19‘‘ unit consisting ofPC with Windows and software; Digitizer 16 Bit, 100 MS/s; Transmitter unit; Receiver unit
Operating temperature5 to 40 °C
Network interface1 GBit/s LAN
Protection classIP20
StandardsDIN EN 61010, DIN EN 60204
Transmitter
Number of channels1 or 4
Pulse heightAdjustable from 8 to 400 V
Frequency range35 kHz to 3 MHz
Max. power2 kW (400 V), optional 4 KW (800 V)
Square wave burst transmitterFreely configurable (the pulse width can be selected individually for every square wave pulse of the burst)
Receiver
Number of channels1 or 4
Frequency range35 kHz to 750 kHz
Gain0 to 120 dB, 0.5 dB increment
Noise1 nV/√Hz
SCANNER (Standard)
Scanning area (X x Y x Z)500 x 500 x 160 mm (Other scanners on request)
Positioning accuracy20 µm
Scan increment0,1 mm

Publications

Single-Sided Contact-Free Ultrasonic Testing - A New Air-Coupled Inspection Technology for Weld and Bond Testing

Mario KIEL , Ralf STEINHAUSEN, Andreas BODI, and Manuel LUCAS

Published 2017 at APCNDT Conference in Singapore

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Air-Coupled Ultrasonic Inspection of Fiber-Reinforced Plates Using an Optical Microphone

Janez RUS, David KULLA, Jan-Carl GRAGER, Christian U. GROSSE

Published 2019 at DAGA - 5. Jahrestagung für Akustik, 18. - 21. März 2019 (Germany)

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A Modular Approach to Non-Contact Ultrasonic Testing of Composites

Peter HOLSTEIN, Uwe HEUERT, Hans-Joachim MÜNCH, Mario KIEL

Published at ECNDT 2014

Download Paper

Downloads

TypeTitleSize
SONOAIR_Flyer.pdf1.51 MB

Schulungen für SONOAIR®

In cooperation with the research institute „Forschungszentrum Ultraschall (FZ-U)“ we offer training courses for air-coupled ultrasonic testing. With theory, simulation and practical demonstrations, the training courses provide a profound introduction to the topic. 

Do you have any questions?

Manuel Lucas

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

Manuel Lucas

+49 (0)345 / 133 17-846
manuel.lucas@sonotec.de
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