Technical specifications of the Cobri™ scanner

  • Suitable for low frequency applications using a broadband multi-layer piezoelectric polymer material, PVDF
  • Separate transmitter (Tx) and receiver (Rx) ensure that the reflection from pulses transmitted from the first roll to the concrete surface do not interfere with the receiving signals on the second roll
  • Dual interface allows the operator to analyse the entire 3D volume after scanning (zoom, scan, rotate, etc.) as well as real-time monitoring
  • Access to the volume sections such as B scans, C scans or D scans that increase clarity and reduce inspection time and interpretation errors

Technical specifications

§  Typical scan speed 10 cm/sec
§  Penetration depth 50 cm
§  Real-time 3D video recording
§  Dry coupling
§  Frequency range ~ 50 – 200 kHz
§  Resolution ~ 1 cm
§  Detection of cracks, voids, air pockets, delaminations, rebars & technical pipes
§  Measurement of concrete thickness in addition to depth & position of features and defects
§  Concrete velocity measurement (strength)
§  Total Focusing Method in both cross- and along track direction

Total focusing method

§  Captured data is processed using a synthetic aperture technique (SAFT)
§  The technique offers a different way of focusing, compared to mechanical focusing (curved transducer or acoustic lens) or phased array
§  A synthetic aperture mimics a large transducer by sampling the area at many points
§  SAFT is based on subsequent focusing of the data measured on an aperture to each point in the reconstructed area through the superposition of the time registers
§  Compared to conventional A-scan and B-scan techniques, SAFT can suppress stochastic noise and help to position the reflectors more accurately in the volume