Self-Healing CMOS Imager Combats Jupiter's Extreme Radiation Environment
Engineers have developed a self-healing CMOS imager that can repair radiation damage pixel by pixel, designed for spacecraft operating in Jupiter's extreme radiation belt where conventional cameras fail. The system also performs aggressive compression to minimize data transmission from deep space.
The Challenge
Jupiter's magnetic field creates one of the harshest radiation environments in the solar system, ionizing sulfur dioxide from Io's volcanoes into fast-moving charged particles. By its 56th orbit, NASA's JunoCam was producing only corrupted images due to radiation damage.
How It Works
The 128x128 pixel imager detects damaged or 'hot' pixels by periodically performing annealing (controlled heating) to repair radiation damage:
- Trapped charges in the semiconductor are released
- Atoms knocked out of place return to their positions
- Crystalline silicon structure is repaired
- Dark current (false signals) is reduced
Compression Advantage
The imager uses edge detection to identify regions of interest and captures only those, cutting data output by approximately 75%. This is critical for spacecraft that must transmit data over interplanetary distances.
Proven Concept
In December 2023, NASA successfully used a similar annealing technique to repair JunoCam by heating the entire camera. The new imager automates this process at the pixel level, enabling continuous operation in extreme radiation.
Source: IEEE Spectrum / ISSCC 2026