SHM spec sheet
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The EDI/VT-SHM-003 unit delivers autonomous, self-contained structural health monitoring (SHM) and damage assessment for a variety of aerospace structures.

The EDI/VT-SHM-003 features impedance-based SHM and uses miniaturized autonomous sensor/actuator units to detect and diagnose damage. EDI/VT-SHM-003 wireless, self-powered sensor/actuators can operate off energy harvested from vibration and thermal gradients. Each sensor/actuator is a complete SHM system and reports independently; this computationally distributed framework minimizes single points-of-failure.

The EDI/VT-SHM-003 is based on a PIC model dsPIC30F6010A (Microchip microcontroller. It has a 30 MHz operating frequency, 16 bit operation, and 8 Kbypes of SRAM memory. The EDI/VT-SHM-003 supports two-channel operation and is powered by a 9 V 400 mAh Li-ion rechargeable battery. The idle system consumes 27 mA for a power of 227 mW. Two channel operation draws 144 mA for a power consumption of 1.21 W. With damage on one or both channels. the current is 173 mA and 201 mA, respectively. Power consumption with damage ranges from 1.45 W to 1.69 W.

The EDI/VT-SHM-003 was developed under NASA support and guidance with aerospace requirements as the basic design driver. The EDI/VT-SHM-003 therefore deploys wirelessly and has been demonstrated in simulated launch environments.

EDI/VT-SHM-003 customers and developers
NASA Langley Research Center
NASA Glenn Research Center
Virginia Tech
Los Alamos National Laboratory
Westinghouse Electric Company (nuclear)
CEV reentry/on-orbit operations

General purpose SHM

  • Complete structural health monitoring
  • Detects micro-cracks, gouges, debonds and other incipient damage
  • Autonomous, wireless, self-powered piezoelectric (PZT) sensor/actuators
  • Self-powered by thermoelectric gradients or mechanical vibration
  • Unique all-digital structural excitation and response detection scheme
  • Each unit performs a complete SHM process and reports damage
  • Computationally distributed framework
  • Acts as technology evaluation package
  • SHM demonstrated on KSC launch support structures & Boeing TPS
    Wind turbine SHM
  • Custom technical support package

Extreme Diagnostics is a small business specializing in the application of advanced optical techniques to difficult measurement problems under demanding circumstances. We have extensive experience in aerospace, structural health monitoring, environmental sensing, optical visualization, and digital holography. Extreme Diagnostics is headquartered in Ocean Shores, Washington State; our R&D facilities are centered in the Boulder, Colorado optics cluster.