The impact-echo method is based on monitoring the periodic arrival of reflected stress waves generated by a small mechanical impact. Unlike traditional ultrasonic pulse velocity testers that require access to both faces of a member and it is not possible to determine the depth to anomalies, DOCter requires access to only one face and is able to obtain information on the depth of  internal flaws or the thickness of a solid member.

DOCter impact-echo

• Measure the thickness of pavements, asphalt overlays, plate-like concrete elements like slabs or walls, etc.
• Detect the presence and depth of voids and honeycombing
• Detect voids below slabs-on-ground
• Evaluate the quality of grout injection in post-tensioning cable ducts or joints for precast elements
• Integrity of a membrane below an asphalt overlay protecting structural concrete
• Delamination surveys of bridge decks, piers, cooling towers, chimneystacks, etc.
• Detect debonding of overlays and patches
• Detect ASR damage and freezing-and-thawing damage
• Measure the depth of surface-opening cracks
• Estimate early-age strength development (with proper correlation)

DOCter Impact-Echo.

• Data Acquisition System:
  • 2 channels, 4 MB/channel
  • 8 bits resolution, 50 MHz bandwidth
  • -5V to 5V Input Voltage Range
  • USB interface
• Dry contact, high sensitivity, piezoelectric handheld transducers
• Accuracy (assuming a constant P-wave speed):
  • Thickness measurement, direct calibration: ± 2%
  • Thickness measurement by surface P-wave speed measurement: ± 3%
  • Depth of surface-opening cracks: ± 4%
• Operating conditions: Temperature: -10 to 50 °C, RH ≤ 95 %

DOC-700

Includes:

Item	Order #
Laptop computer	DOC-10
Data acquisition module with USB cable	DOC-20
Viking Freja software	DOC-30
Mark IV transducer	DOC-40
Star support with 5, 8 and 12 mm impactors	DOC-60
Impactors on spring rods, 5, 8, and 12 mm	DOC-70
Protection caps for transducer tips, 4 pcs	DOC-80
BNC cable	DOC-90
User Manual for Viking Freja software	DOC-150
Operation manual	DOC-160
Binder with testing case studies	DOC-170
Attaché case	DOC-120

DOC-4000

Includes:

Item	Order #
Laptop computer	DOC-10
Data acquisition module with USB cable	DOC-20
Viking Freja software	DOC-30
Viking LONGSHIP with long handle and two Mark IV handheld transducers	DOC-50
Star support with 5, 8 and 12 mm impactors	DOC-60
Impactors on spring rods, 5, 8, and 12 mm	DOC-70
Short handle for crack depth measurement	DOC-80
Protection caps for transducer tips, 8 pcs	DOC-90
BNC cable, 2 pcs.	DOC-100
Manual for Viking Freja software	DOC-150
Operation manual	DOC-160
Binder with testing case studies	DOC-170
Attaché case	DOC-130

To be ordered separately.

• Technical Data Sheet

• Publications

ASTM C1383, “Test Method for Measuring the P-Wave Speed and the Thickness of Concrete Plates Using the Impact-Echo Method”