A quarter-wavelength folded patch antenna is adopted as the passive wireless strain sensor for structural health monitoring (SHM) of bridges. It can be used for continuous surveillance and damage detection. According to theoretical formulations, strain simulation and experiments, it is found that a good linearity relationship can be achieved between normalized resonance frequency shift and the strain both in longitudinal and transverse directions. And the sensing sensitivity in longitudinal strain is better than that in transverse strain. Through conducting tensile experiments, we find that many factors can influence the strain sensitivity. To address this fundamental issue in antenna sensors for strain sensing, a new strain sensitivity experiment is proposed to take the influence of strain transfer ratio change under strain. The linear relationship of strain transfer ratio and deformation is obtained by sensitivity experiment. The corrected sensitivity in longitudinal and transverse strains is calculated based on the linearity. Furthermore, the Possion effect is taken into consideration to explain the opposite effects of experimental and simulated sensitivities in transverse strain.
Ling Yi Tang,
Mei Song Tong,
"Sensitivity Modeling of a Strain-Sensing Antenna," Progress In Electromagnetics Research C,
Vol. 75, 87-97, 2017. doi:10.2528/PIERC17031309
1. Sohn, H., et al. "A review of structural health monitoring literature: 1996–2001," Tech. Rep. LA-13976-MS, Los Alamos Nat. Lab., Los Alamos, NM, USA, 2003.
2. Michie, W. C., B. Culshaw, S. S. J. Roberts, and R. Davidson, "Fiber optic technique for simultaneous measurement of strain and temperature variations in composite materials," Proc. SPIE, Vol. 1588, Boston, MA, USA, Dec. 1991.
3. Lynch, J. P. and K. J. Loh, "A summary review of wireless sensors and sensor networks for structural health monitoring," Shock Vib Digest, Vol. 38, 91-130, 2006. doi:10.1177/0583102406061499
4. Mohammad, I., V. Gowda, H. Zhai, et al. "Detecting crack orientation using patch antenna sensors," Meas. Sci. Technol., Vol. 23, 015102, 2012, doi:10.1088/0957-0233/23/1/015102. doi:10.1088/0957-0233/23/1/015102
5. Murray, W. M. and W. R. Miller, The Bonded Electrical Resistance Strain Gage: An Introduction, Oxford Univ. Press, New York, NY, USA, 1992.
6. Liu, L. and F. G. Yuan, "Wireless sensors with dual-controller architecture for active diagnosis in structural health monitoring," Smart Mater. Struct., Vol. 17, No. 2, 025016, Apr. 2008. doi:10.1088/0964-1726/17/2/025016
7. Kurata, N., B. F. Spencer, M. Ruiz-Sandoval, and , "Risk monitoring of buildings with wireless sensor networks,", Vol. 12, No. 3-4, 315-327, Jul./Dec. 2005.
8. Thai, T. T., G. R. DeJean, and M. M. Tentzeris, "A novel front-end radio frequency pressure transducer based on a dual-band resonator for wireless sensing," IEEE MTT-S International Microwave Symposium Digest, 2009, MTT’09, 1701-1704, IEEE, Boston, 2009.
9. Lee, H., G. Shaker, V. Lakafosis, et al. "Antenna-based ‘smart skin’ sensors for sustainable, wireless sensor networks," 2012 IEEE International Conference on Industrial Technology (ICIT), 189-193, IEEE, Athens, 2012.
10. Lee, H., K. Naishadham, M. M. Tentzeris, et al. "A novel highly-sensitive antenna-based ‘smart skin’ gas sensor utilizing carbon nanotubes and inkjet printing," 2011 IEEE International Symposium on Antennas and Propagation (APSURSI), 1593-1596, IEEE, Spokane, 2011.
11. Sohn, H., C. R. Farrar, F. M. Hemez, D. D. Shunk, D. W. Stinemates, and B. R. Nadler, "A review of structural health monitoring literature,", 1996-2001 NM Report No. LA-13976-MS, Los Alamos National Laboratory.
12. Finkenzeller, K., RFID Handbook, 2nd Ed., Wiley, New York, NY, USA, 2003.