SNL Dennis Roach with a Comparative Vacuum Monitoring (CVM) Sensor showing galleries etched-sensors underside. He lead team that's evaluating some-sensors for Structural Health Monitoring (SHM) aircraft and safety equipment.
The Comparative Vacuum Monitoring sensor is a self-adhesive rubber patch, ranging from dime-to credit-card-sized. The rubber's underside is laser-etched with rows of tiny interconnected channels or galleries to which an air pressure is applied. Any propagating crack in the materials under the sensor breaches the galleries and the resulting change in pressure in monitored. The sensors are made by Structure Monitoring Systems, Inc. (SMS) of Australia, are in expensive, reliable, durable, and easy to apply. They provide equal or better sensitivity than is achievable with conventional inspection methods. Besides, aircraft, SHM techniques could monitor the structural well-being of spacecraft, weapons, rail cars, bridges, oil recovery equipment, buildings, armored vehicles, ships, wind turbines, nuclear power plants, and fuel tanks in hydrogen vehicles.
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June 13, 2014