|Table of Contents|

 Design of characteristic signals detecting system for electromagnetic ultrasonic(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2017年09
Page:
103-109
Research Field:
Publishing date:

Info

Title:
 Design of characteristic signals detecting system for electromagnetic ultrasonic
Author(s):
 LIU Su-zhen 1 LI Li-bin 1 ZHANG Chuang 1 ZHANG Yan-wei 1 YANG Qing-xin 2
 (1. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology,Tianjin 300130,China; 2. Key Laboratory of Advanced Electrical Engineering and Energy Technology,Tianjin Polytechnic University,Tianjin 300387,China)
Keywords:
 SNR preamplifier broadband receiver orthogonal broadband receive
PACS:
TG 115. 28
DOI:
10.15938/j.emc.2017.09.014
Abstract:
To solve the problem of low transduction efficiency,weak signal and low signal-to-noise ratio (SNR) in electromagnetic acoustic transducer (EMAT) system,the detection system was designed,including EMAT,low noise preamplifier,broadband receiver and the orthogonal phase-locked amplifier based on the LabVIEW. The difference between the traditional EMAT structure and the new EMAT structure flux density was compared,by increasing the intensity of the bias magnetic field can improve the efficiency of EMAT; The frequency response characteristic of preamplifier,broadband receiver and EMAT were analyzed. The impact of the order,filter type and cut-off frequency of the low pass filter,to detect the ultrasonic echo signal was studied. Results indicate that the system can achieve the goal of real-time acquisition,storage and analysis of electromagnetic ultrasonic echo signal and improve the SNR and resolution of signals.

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Last Update: 2018-02-06