The Curlin Air is a non-contact, through transmission, air-coupled ultrasonic flaw detector. With an operating frequency of 50kHz, very low compared to conventional ultrasonic testing, the system is able to detect abnormalities in the sound path through even the most attenuating materials. The Curlin Air requires no surface preparation and can penetrate up to 6 inches (150mm) of foam, wood, honeycomb and other materials with a high air volume ratio.

A transmitting and receiving probe are positioned on opposite sides of the test object by means of a mechanical yoke or a pair of magnetic wheeled carriers. The live displays show instantly if the sound path is interrupted by a defect in the material. Flaw gates and alarms can be programmed and stored for each application.

As the use of adhesively bonded structures has increased across many industries, the need for testing bond integrity has grown.Multiple glue lines, sandwich constructions with foam and honeycomb cores, bonded carbon fibre composites and even wood have all become important in manufacturing. The integrity of these bonds is critical to the quality of the final product.Conventional ultrasonic methods can be limited for these applications and so a variety of alternative methods have been developed to handle this range of material combinations.

NDT Systems Curlin Air-coupled ultrasonics and requires no surface preparation and no direct contact with test object. It performs sensitive inspections to detect voids, impact damage, and disbonds in a wide variety of water-incompatible materials. Originally used primarily for aerospace composites, the Curlin Air is referenced specifically by major aerospace manufacturers in their published inspection procedures. It has since evolved to evaluate a diverse range of materials including propellants and wood and foam panels.

Air-coupled ultrasonic techniques are used when testing sensitive materials which are at risk of contamination during the testing processes or in situations when the cost of removing special coatings from the material to be tested is impractical. Wetting agents or powders typically used in conventional ultrasonic testing can lead to degradation of sensitive components.


  • Air coupled UT
  • Remarkable penetrating power
  • Non-contact, Through transmission, no surface preparation
  • A-trace display
  • Alarms: adjustable trigger level, audible and visual
  • Adjustable range, delay and gain
  • Programmable user setups


  • Composites
  • Foam core laminates
  • Glass fiber/ carbon fiber composites
  • Far-side defects
  • Bonded honeycomb structures
  • Construction materials:
  • Drywall, plywood, particleboard, cement
  • Structural urethane foam

Standard Curlin Air Kit Includes:

  • Curlin Air Instrument
  • Pelican style shipping case
  • User manual
  • Batteries
  • AC Charger


Physical:Dimensions:10.20" x 5.75" x 4.50" (259 x 146 x 114 mm)
Weight:6.3 lbs. (2.9 kg.)
Case Construction:Aluminum body, rubber end caps
Connector Type:BNC
Keypad Type:Tactile membrane feedback keys
Operating Temperature:32°F to 140°F (0°C to 60°C)
Power Source:5x D-sized NiMH or alkaline batteried (8-10 hrs.) or AC Mains
Display:Type:High Speed LCD
Size:4.75" x 3.50" (121 x 89 mm)
Transducer:Type:AT1-Standard Transmitter and Receiver; 1.5" (38mm) diameter
AT2 Mini-Receiver; 0.25" (6.4mm) diameter
Frequency Range:50kHz
Measurements:Thickness Range:1" to 200" (0.025 to 5.08m) in Air
Velocity Range:0.005 to 0.750 in./µs (0.13 to 19.05 mm/µs)
Delay:0" to 199" (0 to 5.05m) in Air
Display Modes:RF
Pulse Length:Adjustable cycles in tone-burst
Units Displayed:In. / mm
Alarms:Audible and visual alarm modes
Connectivity:Storage:Up to 50 setups
Output:Analog Output (optional)
  • Availability: 10 In Stock
  • Brand: NDT SYSTEMS

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