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Using ultrasound to supply sensors and transmit data through metal walls
Wallpass uses sound waves to power and probe all types of sensors (temperature, stress, strain, vibration, etc.) located in enclosed metal environments, such as pressure vessels. It can transmit signals with a strength of few watts through several centimeters thickness walls. Piezoelectric transducers convert this acoustic energy to electricity. The intelligent part of the system is located in its easily accessible emitter. The receiver electronics are as simple as possible, to keep the sensor’s implementation costs low and ensure its sturdiness and reliability over time.
Wallpass was approved following industrial field trials to detect anomalies in clamped connections between metal tubes and to prevent pipeline leaks.
• Oil and gas/oil rig pipes: monitoring physical parameters inside pipes; detecting connection defects during assembly
• Corrosion measurements on ship and submarine hulls
• Monitoring metal tanks, including pressure vessels
• Chemical tank monitoring
• Vacuum monitoring in superconducting power cables
Technology protected by three patents covering the concept and control electronics
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.