Study on Pulse Compression Ultrasonic Imaging by a Stacked M‐Sequence Encoding Probe

2018 ◽  
Vol 207 (1) ◽  
pp. 36-42
Author(s):  
Yorinobu Murata ◽  
Daiyu Kaneda
Keyword(s):  
Pulse Compression ◽  
Ultrasonic Imaging ◽  
M Sequence ◽  
Sequence Encoding

scholarly journals Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

2021 ◽  
Vol 11 (4) ◽  
pp. 1508
Author(s):  
Muhammad Khalid Rizwan ◽  
Stefano Laureti ◽  
Hubert Mooshofer ◽  
Matthias Goldammer ◽  
Marco Ricci
Keyword(s):  
Carbon Fiber ◽  
Pulse Compression ◽  
Phased Array ◽  
Signal To Noise Ratio ◽  
Near Field ◽  
Ultrasonic Imaging ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Custom Made ◽  
Carbon Fiber Reinforced

The use of pulse-compression in ultrasonic non-destructive testing has assured, in various applications, a significant improvement in the signal-to-noise ratio. In this work, the technique is combined with linear phased array to improve the sensitivity and resolution in the ultrasonic imaging of highly attenuating and scattering materials. A series of tests were conducted on a 60 mm thick carbon fiber reinforced polymer benchmark sample with known defects using a custom-made pulse-compression-based phased array system. Sector scan and total focusing method images of the sample were obtained with the developed system and were compared with those reconstructed by using a commercial pulse-echo phased array system. While an almost identical sensitivity was found in the near field, the pulse-compression-based system surpassed the standard one in the far-field producing a more accurate imaging of the deepest defects and of the backwall of the sample.

Acoustical Imaging Using M-sequence Encoding Array Transducer

1991 ◽  
Vol 30 (S1) ◽  
pp. 152 ◽  
Author(s):  
Kiyohito Koyama ◽  
Yorinobu Murata ◽  
Katsufumi Tanaka ◽  
Yasutaka Tamura
Keyword(s):  
Array Transducer ◽  
M Sequence ◽  
Sequence Encoding ◽  
Acoustical Imaging

Ultrasonic Imaging System Using Spatial and Temporal M-Sequences

1979 ◽  
Vol 1 (3) ◽  
pp. 245-254 ◽  
Author(s):  
Takuso Sato ◽  
Shusou Wadaka
Keyword(s):  
Imaging System ◽  
Signal To Noise Ratio ◽  
Ultrasonic Imaging ◽  
Spatial Modulation ◽  
High Signal ◽  
Temporal Modulation ◽  
Range Resolution ◽  
M Sequence ◽  
Azimuth Resolution ◽  
M Sequences

A new ultrasonic imaging system combining temporal modulation of the ultrasonic signal by an M-sequence with spatial modulation of the wave field by a rotating M-sequence phase disk has been developed. This system uses neither beam forming nor transducer scanning, and has high resolution both in range and azimuth. The correlation function of the temporal M-sequence determines the range resolution, while the azimuth resolution is determined by the configuration of the rotating M-sequence phase disk. The use of the M-sequence modulations also results in images with high signal-to-noise ratio.

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