Application of chirp pulse compression technique to a high-temperature EMAT with a large lift-off

2020 ◽  
pp. 1-16
Author(s):  
Wenze Shi ◽  
Weiwei Chen ◽  
Chao Lu ◽  
Jinjie Cheng ◽  
Yao Chen
Keyword(s):  
High Temperature ◽  
Pulse Compression ◽  
Chirp Pulse ◽  
Compression Technique ◽  
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High S/N Ratio Guided Wave Inspection of Pipe Using Chirp Pulse Compression

2004 ◽  
Author(s):  
Kiyokazu Toiyama ◽  
Takahiro Tsutsumoto ◽  
Takashi Ikeda ◽  
Takahiro Hayashi
Keyword(s):  
Long Range ◽  
Pulse Compression ◽  
Signal To Noise Ratio ◽  
Effective Means ◽  
Side Lobe ◽  
Guided Wave ◽  
Pulse Excitation ◽  
Chirp Pulse ◽  
Compression Technique ◽  
Heat Insulator

Guided wave is expected as the most promising technique for rapid long-range inspection of pipes. However, signal to noise ratio is still required to be improved, especially in highly attenuative pipes covered with heat insulator and/or buried in the ground. Recently, pulse compression technique has been developed as an effective means for improving S/N ratio in the field of radar detection. In this paper, chirp pulse compression technique was applied to the long-range inspection of pipe using guided wave. The technical brief explanation about chirp pulse compression was described. Example data signals of burst wave excitation way and chirp pulse excitation way with commonly -used amplifier were reviewed with respect to unwanted side lobe. The cause of a side lobe was investigated, and the amplifier with excellent distortion property was presented to improve S/N ratio of system with quite vanishing of side lobe.

A CO2 laser rangefinder using heterodyne detection and chirp pulse compression

1981 ◽  
Vol 13 (1) ◽  
pp. 35-45 ◽  
Author(s):  
K. F. Hulme ◽  
B. S. Collins ◽  
G. D. Constant ◽  
J. T. Pinson
Keyword(s):  
Co2 Laser ◽  
Pulse Compression ◽  
Heterodyne Detection ◽  
Chirp Pulse ◽  
Laser Rangefinder

Patterning of epitaxial VO2microstructures by a high-temperature lift-off process

2014 ◽  
Vol 1 (4) ◽  
pp. 046302 ◽  
Author(s):  
Tony Yamin ◽  
Tal Havdala ◽  
Amos Sharoni
Keyword(s):  
High Temperature ◽  
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