scholarly journals Photoacoustic computed tomography by using a multi-angle scanning fiber-laser ultrasound sensor

2020 ◽  
Vol 28 (6) ◽  
pp. 8744 ◽  
Author(s):  
Yizhi Liang ◽  
Lingxuan Li ◽  
Qiang Li ◽  
Hao Liang ◽  
Long Jin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Fiber Laser ◽  
Laser Ultrasound ◽  
Ultrasound Sensor ◽  
Scanning Fiber

scholarly journals Photoacoustic computed tomography with lens-free focused fiber-laser ultrasound sensor

2019 ◽  
Vol 10 (5) ◽  
pp. 2504 ◽  
Author(s):  
Xue Bai ◽  
Yumeng Qi ◽  
Yizhi Liang ◽  
Jun Ma ◽  
Long Jin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Fiber Laser ◽  
Laser Ultrasound ◽  
Ultrasound Sensor

scholarly journals Flexible fiber-laser ultrasound sensor for multiscale photoacoustic imaging

2021 ◽  
Vol 4 (8) ◽  
pp. 200081-200081
Author(s):  
Bai-Ou Guan ◽  
◽  
Long Jin ◽  
Jun Ma ◽  
Yizhi Liang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Photoacoustic Imaging ◽  
Laser Ultrasound ◽  
Flexible Fiber ◽  
Ultrasound Sensor

Wide-field photoacoustic microscopy with a fiber laser ultrasound sensor

2017 ◽  
Author(s):  
Yizhi Liang ◽  
Long Jin ◽  
Jun Ma ◽  
Xue Bai ◽  
Bai-Ou Guan
Keyword(s):  
Fiber Laser ◽  
Wide Field ◽  
Laser Ultrasound ◽  
Photoacoustic Microscopy ◽  
Ultrasound Sensor

scholarly journals Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1433 ◽  
Author(s):  
Miao-Xia Xie ◽  
Yan-Xin Li ◽  
Xiang-Tao Shang ◽  
Xue-Wu Wang ◽  
Jun-Yu Pei
Keyword(s):  
Computed Tomography ◽  
Powder Metallurgy ◽  
Laser Welding ◽  
Fiber Laser ◽  
Heat Input ◽  
Dominant Role ◽  
Fusion Welding ◽  
Fiber Laser Welding ◽  
Welding Heat Input ◽  
Porosity Defects

Porosity defects are still a challenging issue in the fusion welding of molybdenum and its alloys due to the pre-existing interior defects associated with the powder metallurgy process. Fiber laser welding of end plug and cladding tube made of nanostructured high-strength molybdenum (NS-Mo) alloy was performed in this work with an emphasis on the role of welding heat input. The distribution and morphology of porosity defects in the welded joints were examined by computed tomography (CT) and scanning electron microscopy (SEM). Preliminary results showed that laser welding of NS-Mo under low heat input significantly reduced the porosity defects in the fusion zone. The results of computed tomography (CT) showed that when the welding heat input decreased from 3600 J/cm (i.e., 1200 W, 0.2 m/min) to 250 J/cm (i.e., 2500 W, 6 m/min), the porosity ratio of the NS-Mo joints declined from 10.7% to 2.1%. Notable porosity defects under high heat input were related to the instability of the keyhole, expansion and the merging of bubbles in the molten pool, among which the instability of the keyhole played the dominant role. The porous defects at low heat input were generated as bubbles released from the powder metallurgy base metal (BM) did not have enough time to overflow and escape.

Highly sensitive fiber laser ultrasound hydrophones for sensing and imaging applications

2016 ◽  
Vol 41 (19) ◽  
pp. 4530 ◽  
Author(s):  
Di Liu ◽  
Yizhi Liang ◽  
Long Jin ◽  
Huojiao Sun ◽  
Linghao Cheng ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Laser Ultrasound ◽  
Highly Sensitive

High-performance fiber laser ultrasound detectors

2015 ◽  
Author(s):  
Yizhi Liang ◽  
Long Jin ◽  
Linghao Cheng ◽  
Zhaohui Li ◽  
Bai-Ou Guan
Keyword(s):  
Fiber Laser ◽  
High Performance ◽  
Laser Ultrasound ◽  
High Performance Fiber
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