Data Communications Using Guided Elastic Waves by Time Reversal Pulse Position Modulation: Experimental Study

Sensors

Yuanwei Jin²  Yujie Ying¹ 

[1]Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA

[2] E-Mail:

[3]Department of Engineering and Aviation Sciences, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA

关键词: piezoelectric sensors;    structural health monitoring;    communication;    telemetry;    time reversal;    guided elastic waves;    timing acquisition;    steel pipes;   

DOI  :  10.3390/s130708352

来源: mdpi

【 摘 要 】

In this paper, we present and demonstrate a low complexity elastic wave signaling and reception method to achieve high data rate communication on dispersive solid elastic media, such as metal pipes, using piezoelectric transducers of PZT (lead zirconate titanate). Data communication is realized using pulse position modulation (PPM) as the signaling method and the elastic medium as the communication channel. The communication system first transmits a small number of training pulses to probe the dispersive medium. The time-reversed probe signals are then utilized as the information carrying waveforms. Rapid timing acquisition of transmitted waveforms for demodulation over elastic medium is made possible by exploring the reciprocity property of guided elastic waves. The experimental tests were conducted using a National Instrument PXI system for waveform excitation and data acquisition. Data telemetry bit rates of 10 kbps, 20 kbps, 50 kbps and 100 kbps with the average bit error rates of 0, 5.75 x 10-⁴, 1.09 x 10-² and 5.01 x 10-², respectively, out of a total of 40, 000 transmitted bits were obtained when transmitting at the center frequency of 250 kHz and a 500 kHz bandwidth on steel pipe specimens. To emphasize the influence of time reversal, no complex processing techniques, such as adaptive channel equalization or error correction coding, were employed.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.