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Vol. 166, Issue 3, March 2014, pp. 44-49




Enhancing Ultrasonic Echoes of Sediment Layer Based on 2nd Iterative Passive Time Reversal Mirror

1,2 Di FAN, 1 Huibin LIANG, 1 Maoyong CAO

1 Shandong University of Science and Technology, Qingdao, 266590, China
2 Shandong Provincial Key Laboratory of Robotics and Intelligent Technology, Qingdao, China

E-mail: fandi_93@126.com


Received: 26 December 2013 /Accepted: 28 February 2014 /Published: 31 March 2014

Digital Sensors and Sensor Sysstems


Abstract: The amplitude difference of the sediment layer’s echoes is always so large that the acoustic time difference becomes much difficult to get correctly. The existing methods of time varying enhancement for the multipath signal like ultrasonic echo have some limits in de-noising or practical application. This paper employs the second Iterative Passive Time Reversal Mirror to accomplish time varying enhancement for the ultrasonic signal. According the principle of measuring the sediment thickness in borehole by ultrasonic, the paper has established the system model to describe the processing of ultrasonic transmitting through the mud-sediment media, and simplified the channel in a linear, space-invariant, time-invariant multipath channel with two paths. Based on the model, the process of enhancing echoes of sediment layer by 2nd Iterative Passive Time Reversal Mirror is presented. Using the echoes of sediment with different thickness obtained in lab circumstance, two typical experiments to enhance the echoes have been taken. From the two experiments’ results we can see, 2nd Iterative Passive Time Reversal Mirror is sure to give the later arrival echo bigger gain than to the earlier one, thus reduce the amplitude difference of the two echoes.


Keywords: Sediment thickness, Ultrasonic echo, Iterative passive time reversal mirror (IPTRM), Time varying enhancement (TVE).


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