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NEWTON - Novel Sensing Network for Intelligent Monitoring 09/07/2013. Dr. Dave Graham Mr. Jeff Neasham Dr. Zhiguo Ding Prof. Gui Yun Tian. NEWTON Objectives.
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NEWTON - Novel Sensing Network for Intelligent Monitoring 09/07/2013 Dr. Dave Graham Mr. Jeff Neasham Dr. Zhiguo Ding Prof. Gui Yun Tian
NEWTON Objectives 4 year project - Bridging the gap between NDE and SHM, using a novel combination of passive wireless technology with PEC and acoustic wave sensing (Newcastle University). Applying non-linear system identification and model-based signal processing to assess the location, size, and microstructure of defects in structures (University of Sheffield). Building cloud-based diagnostic software architectures, and data management for the software implementation of developed technologies (University of York).
Application Example Data Management (York) S1 S2 Power Data • Valuable infrastructure. • Sensors at critical locations. • Completely passive sensors. • Very large read range! • Efficient, cost effective measurements. Feature Extraction (Sheffield) 10m+ range Wifi, GPRS, SD card Reader
Reader (Front End) Packet Structure Digital Interface (SPI) Error Checking Processing / Demodulation ID (4Bytes) Data (<20Bytes) Power Supply RF Signal Source Reader Antenna High frequency (868MHz) Power and Communications MUT Tag Low Power Microcontroller Comms / Power Antenna Waveform Generation Modulation Drive Circuit Sensing Temperature Sensor ADC Power Harvesting Proposed Design • FeatureExtraction (Sheffield) Data Management (York) Data Management ? Reader 10m+ Tag MUT
Sensing Challenges • Scope / Sensitivity Trade-off • Resolution • Ultra-low Power Operation • Minimise Complexity / Cost • Size / Profile • ADC Specification • Installation
What is Achievable? • Power Budget < 20uJ per measurement • Read range <25m • Temperature sensing for drift compensation • 32-bit ID for position information • 16 bit CRC for error checking • Transmission @ 38.4k baud • 2MHz sampling with today’s hardware • Both EM and acoustic techniques are viable within these constraints
Conclusion • NEWTON Project • Proposed sensors have a lot to offer SHM in industry. • Potential for long range, wireless measurement • Completely passive, very long lifetime • Combine acoustic measurements and EM measurements for better structure coverage • Challenge is achieving high sensitivity, high resolution within the power, size and cost constraints