Wireless interrogation of passive antenna sensors

Recently, we discovered that the resonant frequency of a microstrip patch antenna is sensitive to mechanical strains or crack presence in the ground plane. Based on this principle, antenna sensors have been demonstrated to measure strain and detect crack in metallic structures. This paper presents a wireless method to remotely interrogate a dual-frequency antenna sensor. An interrogation horn antenna was used to irradiate the antenna sensor with a linear chirp microwave signal. By implementing a light-activated switch at the sensor node and performing signal processing of the backscattered signals, the resonant frequencies of the antenna sensor along both polarizations can be measured remotely. Since the antenna sensor does not need a local power source and can be interrogated wirelessly, electric wiring can be eliminated. The sensor implementation, the signal processing and the experimental setup that validate the remote interrogation of the antenna sensor are presented. A power budget model has also been established to estimate the maximum interrogation range.

[1]  Walter Lang,et al.  Condensation Detection Using a Wirelessly Powered RF-Temperature Sensor , 2009, IEEE Transactions on Vehicular Technology.

[2]  Billie F. Spencer,et al.  Risk monitoring of buildings with wireless sensor networks , 2005 .

[3]  Jerome P. Lynch,et al.  Rapid-to-deploy wireless monitoring systems for static and dynamic load testing of bridges: validation on the Grove Street Bridge , 2006, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[4]  Shawn M. Walsh,et al.  Wireless, passive, resonant-circuit, inductively coupled, inductive strain sensor , 2002 .

[5]  Vijay K. Varadan,et al.  Modeling of passive wireless sensors for RFID tag applications , 2006, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[6]  Haiying Huang,et al.  Exploiting a patch antenna for strain measurements , 2008 .

[7]  W.D. Hunt,et al.  Development of a Shear Horizontal SAW RFID Biosensor , 2007, 2007 IEEE Sensors.

[8]  Manos M. Tentzeris,et al.  Crack Detection and Monitoring Using Passive Wireless Sensor , 2009 .

[9]  Constantine A. Balanis,et al.  Antenna theroy analysis and design , 2005 .

[10]  Lei Wang,et al.  Energy harvesting by magnetostrictive material (MsM) for powering wireless sensors in SHM , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Billie F. Spencer,et al.  Structural health monitoring utilizing Intel's Imote2 wireless sensor platform , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[12]  Jerome P. Lynch,et al.  Wireless structural monitoring for homeland security applications , 2004, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[13]  Lauri Sydanheimo,et al.  Radar cross-section analysis for passive RFID systems , 2006 .

[14]  S. Beeby,et al.  Energy harvesting vibration sources for microsystems applications , 2006 .

[15]  Davide Dardari,et al.  Passive Ultrawide Bandwidth RFID , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[16]  Wen Wang,et al.  Development of wireless MEMS sensor for RFID tag and temperature/pressure monitoring , 2007, SPIE MOEMS-MEMS.

[17]  K. Najafi,et al.  A passive wireless integrated humidity sensor , 2001, Technical Digest. MEMS 2001. 14th IEEE International Conference on Micro Electro Mechanical Systems (Cat. No.01CH37090).