Overview
- Researchers led by Fu Jingcheng flew a seven-minute helicopter trial of an Airborne Transient Electromagnetic system made of three 25-meter dodecagonal coils suspended by cables and confirmed the array can be held near level for precise measurements under controlled flight.
- The Atem system works by transmitting a strong electrical pulse from a transmitter coil and recording secondary electromagnetic responses with a receiver coil to identify conductive objects and estimate depth and composition.
- The team solved major stability problems by developing a computer model for optimal cable lengths and tensions and by attaching a flexible aerodynamic film that passively reduces oscillation.
- Trials also exposed clear limits because moderate acceleration and turns caused pitching greater than 20 degrees and heavy cable strain, so the researchers recommend slow, smooth flight and gradual turns for reliable data.
- Previous 2012 simulations showed Atem combined with synthetic-aperture imaging could detect a scaled submarine in salt water but sea trials and real-world testing against operational nuclear submarines have not yet been done, and civilian mapping remains the system's stated purpose.