General Info

For 20 years Magneto Optic Imaging (MOI) has been pivotal in increasing use and life extension of aircraft structures. MOI is a highly effective and efficient non-destructive evaluation (NDE) process that can be used to detect surface and sub-surface cracks in aircraft skin near fasteners, as well as sub-surface corrosion. Using eddy current excitation, the MOI’s rapid scanning process enables aircraft inspectors to observe greater flaw detail, and greatly reduces downtime for required inspections. Qi2 is excited to announce our latest and most advanced MOI system, the MOI+. In our latest design, we have

  • Replaced the analog controls with digital interface
  • Replaced the Heads-Up display (headset) with an LCD monitor that can be attached to the imager or hand-held
  • Reduced the imager size while maintaining a large 45mm field of view (FOV)
  • Added digital video output to facilitate recording of inspections
  • Enhanced the video quality


MOI Advantages

  • Calibration not required
  • Significant time savings in inspections
  • Minimal operator training required
  • Paint stripping or protective coating removal not required
  • Rapid real-time inspection of large areas
  • Demonstrated 10 times faster than eddy current probes alone



  • Multi-Frequency (5,10,20,100,150,200kHz), 3 Power Settings, 2 Excitation Modes
  • Excitation built into imager
  • Lightweight and compact with 45 mm FOV
  • Triple Display, and DVI output
  • Higher resolution imaging and finer contrast control


  • Detect surface and sub-surface cracks and corrosion
  • Inspection of ferromagnetic fasteners
  • Reduced inspection time and inspector fatigue
  • Record inspections
  • Higher quality images with reduced


Chosen by manufacturers, carriers and military fleets:

  • Aerospatiale
  • Boeing
  • Canadair
  • Cessna Daimler-Benz
  • Aerospace
  • Gulfstream
  • FAA
  • Northrop Grumman
  • NASA
  • US Air National Guard
  • US Air Force
  • US Navy (NAVAIR)
  • Raytheon E-Systems
  • China Air Force
  • Israeli Air Force
  • Polish Air Force
  • American Airlines
  • Delta
  • Nippon Airways
  • Qantas
  • Royal Air Maroc
  • Southwest
  • Singapore Airlines
  • United

Technical Specifications

Features and Performance

  • Excitation built into control unit

  • Lightweight and compact imager at 2.3lbs

  • One imager for all excitation frequencies, power levels, and modes

  • Increased sensitivity in flaws at any orientation

  • Higher resolution and reduced distortion

  • Accepted Boeing method for lap joint inspection at Alodine rivet

  • Improved performance at elevated temperatures

Frequency RangeMulti-frequency (5kHz, 10kHz, 20kHz, 50kHz, 100kHz, 150kHz, 200kHz)
Excitation Power LevelsLow, Medium, & High

Excitation Mode

Circular, Vertical, & Horizontal

Field of View

1.77” (45mm) lens


  • DVI/BNC output for External Monitor (not included) and DVR capability

  • Hand-Held LCD

Excitation Method (Eddy Current)

Multi Directional (circular, horizontal, vertical)

Flaw Detection

Aircraft Inspection

  • Flush Mount Fasteners

  • Countersunk Fasteners

  • Fatigue Cracks

  • Corrosion, subsurface cracks

  • Spotwelds

  • Alodine Rivets

Industrial NDI

  • Fatigue Cracks

  • Non-ferromagnetic metals

  • Ferromagnetic metals

Operational Temperature 32°F to 104°F (0°C to +40°C)
Imager Height

4.2” (107mm)

Imager Size 4.2” x 6.6” (107 x 168mm)

Imager Weight

2.3 lbs (1.04 kg)

LCD Size2.3” x 3.1” (58 x 79mm)
Standard Equipment

  • Imager with LCD

  • Power Control Unit with LCD

  • Imager Cable

  • Imager Wear Pad Tape

  • Custom Ruggedized Shipping Case

Optional Accessories

  • Set up standard for cracks

  • Set up standard for corrosion

  • Imager wear pad tape

  • Demagnetizer

Imaged Scans

MOI Model Images MOI+ and previous MOI models

Rivets or holes show as smooth circular forms. In the MOI+ image shown here there are two rivets with no cracks and two rivets with cracks. Cracks can be seen around the complete circumference of the rivet site in one pass of the imager over the aircraft. Surface images are viewed using higher frequencies (50 – 100 kHz). To penetrate more deeply into the metal, the inspector must lower the frequency level on the power unit.

A crack between two rivets gives this effect, using MOI+ for inspection. This is viewed at a low power mode at 100 kHz.

MOI+ image of a surface crack protruding from both sides of the rivet site. This is viewed at a low power mode at 100kHz.

This MOI 308/7 image is a third layer crack image that is 0.084″ from the surface. The frequency has been set to 5 kHz resulting in a more diffuse image. Since surface cracks will also be visible, it is important that the inspector perform a high frequency scan first and mark surface defects. When the frequency is lowered, new crack images are subsurface defects.

This is an MOI 308/3 image of corrosion on the aircraft bellyskin. Frequency has been set to 5 kHz. Corrosion images are irregular in shape and show as dark shadows between rivets or around rivet sites. In this sample there is a chem-milled step which shows as a dark line shape to the right of the corroded area. Since the MOI is an area inspection device instead of a point by point device (such as an eddy current probe) the MOI can rapidly locate corroded areas.

The MOI 308/7 is also being used by the military to detect defective spotwelds. Good spotwelds show as very faint rivet like images. A broken spotweld image shows clearly. A technical order exists for spotweld inspection of the KC-135 aircraft.

MOI 308/7 image of a small corrosion pit (dark area in the center of the picture). Corrosion is irregular in shape and can be most easily identified by moving the imager across the area being inspected. Corrosion is seen as irregular shadow shapes moving with the imager.

MOI+ TDF Images

MOI+, along with previous models, includes Alodine inspection ability. This image shows a surface crack in an Alodine rivet at 100kHz.



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