WP632 - Tapping Exfoliation Detector

WP632 - Tapping Exfoliation Detector

The detected exfoliations in an aluminium honeycomb board and FRP honeycomb board are shown in the diagram below.



  • Compact and lightweight
  • Easy to operate
  • Quantitative display of defects
  • Logging of measured values (when used with optional WP632M)
  • Operative even in a noisy place


  • Detection of debonds in honeycomb structures
  • Detection of damage behind honeycomb structures
  • Determination of moisture in honeycomb structures
  • Detection of the positions and shapes of inserts in honeycomb structures
  • Detection of interlayer debonds in composite boards
  • Detection of debonds of joints in composite structures (debonds of helicopter blades)
  • Location of beams in walls, etc.
  • Detection of debonds in tiles
  • Detection of debonds in clad steel
  • Detection of debonds in coatings
  • Detection of boundaries between different materials, different plate thickness or structures under coated surfaces
  • Characteristics analysis of the sounding boards of musical instruments, such as the KOTO (Japanese harp), pianos and violins (identification of masterpieces)
  • Detection of the water level in a container from outside
  • Detection of dryness (hardening) of bonding agents, etc.
  • Comparison and evaluation of surface hardness (elasticity) of various plates
  • Measurement of the tension of membrane
  • Detection of the unfilled parts of foamed sandwich panels.


  • Size: 100mm (H) X 46mm (W) X 276mm (L)
  • Weight: 400g
  • Power consumption: 1 watt
  • Battery life: About 10 hours where alkaline batteries are continuously used.

WP632M - Separate Monitoring Unit (available on Option)

This monitoring unit when connected to WP632, shows the measured values both digitally and in a bar-graph, and memorized them. It is provided with a connector for data transmission to a personal computer available on the market.


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  • Digital display of the base value
  • Digital and bar-graph display of the measured values
  • Memorizing of the base value and measured values as well as display of the number of memorized points
  • Data transmission to a personal computer
  • Memory capacity up to 5,000 points


  • Size: 170mm (H) X 130mm (W) X 50mm(D)
  • Weight: 650g
  • Power: Size AA battery X 4
  • Power consumption: 0.3 watt

Handling Ease and Performance Features of Woodpecker

    • The Woodpecker is small and light enough for one-hand operation.
    • It is simple and easy to operate.
      The Woodpecker has only two switch buttons, the start button to actuate the hammer (and also to turn on the power supply) and the memory switch to set the standard value. 
      Even a beginner can use it immediately. What corresponds to the calibration of the usual measuring instrument is achieved by a single press of the memory button.
    • High detection sensitivity.
      The Woodpecker is as sensitive as any other debond detector in current use
    • It can detect the debonds even while moving. 
      Depending on the surface coarseness, the Woodpecker can detect the debonds even while moving if the speed is not faster than 20 cm/s. A smooth Al honeycomb, for instance, would permit this moving detection.
    • It excels in wear-resistance. 
      Unlike other debond detectors which move while maintaining contact with the object surface, the Woodpecker taps intermittently while moving and therefore the ham mer head is in itself less subject to wear.

Undetectable items

A small number of little bubbles or debonds, or cracks in a direction vertical to the surface, which has little effect on surface elasticity, are undetectable. Rough surfaces or surfaces on which sand, dust or oil have accumulated absorb the impacts of the tapping hammer and do not allow the detection of debonding underneath.

It is better for inspection to clean and remove them in advance.

Furthermore, where the debond of test pieces are made by inserting Teflon sheets between skin and core and there is some compression between them, it is hard for WP to detect this type of debonds underneath. Because there is no debond in them but compression.

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WP632 - Tapping Exfoliation Detector