Transillumination Laser Computed Tomography System with Fiber-Optic-Based Coherent Detection Imaging Method - High Spatial-Resolution and Quantitative Tomographic Imaging of Highly Scattering Objects -

2003 ◽  
Vol 10 (5) ◽  
pp. 462-465
Author(s):  
Yoshiaki Sasaki ◽  
Jota Suzuki ◽  
Hiroki Inage ◽  
Ryota Emori ◽  
Shinji Tanosaki ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Spatial Resolution ◽  
Fiber Optic ◽  
High Spatial Resolution ◽  
Tomographic Imaging ◽  
Coherent Detection ◽  
Imaging Method ◽  
Tomography System ◽  
Laser Computed Tomography

scholarly journals Fundamental Imaging Properties of Transillumination Laser Computed Tomography Based on Coherent Detection Imaging Method.

2002 ◽  
Vol 18 (12) ◽  
pp. 1329-1333 ◽  
Author(s):  
Tetsuya YUASA ◽  
Shinji TANOSAKI ◽  
Yoshiaki SASAKI ◽  
Michiaki TAKAGI ◽  
Akira ISHIKAWA ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coherent Detection ◽  
Imaging Method ◽  
Imaging Properties ◽  
Laser Computed Tomography

scholarly journals Studies on Laser Computed Tomography Measurements of Human Teeth using Coherent Detection Imaging Method

1998 ◽  
Vol 19 (1) ◽  
pp. 1-12
Author(s):  
Masaru ENOMOTO ◽  
B. DEVARAJ ◽  
Masaki KOBAYASHI ◽  
Masashi USA ◽  
Motohiro TAKEDA ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coherent Detection ◽  
Imaging Method ◽  
Human Teeth ◽  
Laser Computed Tomography

scholarly journals Development of Low-Cost Fast Photoacoustic Computed Tomography: System Characterization and Phantom Study

2019 ◽  
Vol 9 (3) ◽  
pp. 374 ◽  
Author(s):  
Mohsin Zafar ◽  
Karl Kratkiewicz ◽  
Rayyan Manwar ◽  
Mohammad Avanaki
Keyword(s):  
Computed Tomography ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
High Performance ◽  
Low Cost ◽  
Single Element ◽  
Tomography System ◽  
System Characterization ◽  
2D Images ◽  
Fast Rotating

A low-cost Photoacoustic Computed Tomography (PACT) system consisting of 16 single-element transducers has been developed. Our design proposes a fast rotating mechanism of 360o rotation around the imaging target, generating comparable images to those produced by large-number-element (e.g., 512, 1024, etc.) ring-array PACT systems. The 2D images with a temporal resolution of 1.5 s and a spatial resolution of 240 µm were achieved. The performance of the proposed system was evaluated by imaging complex phantom. The purpose of the proposed development is to provide researchers a low-cost alternative 2D photoacoustic computed tomography system with comparable resolution to the current high performance expensive ring-array PACT systems.

High Spatial Resolution Crack Monitoring in Concrete Structures Using a Distributed Fiber Optic Sensor

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Kevin (Wenhai) Li ◽  
Michel Gaudet
Keyword(s):  
Spatial Resolution ◽  
Fiber Optic ◽  
High Spatial Resolution ◽  
Early Stage ◽  
Large Strain ◽  
Fiber Optic Sensor ◽  
Crack Location ◽  
Four Point Bending ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor

Abstract A method to monitor the mechanical behavior and identify crack location and growth in a concrete structure element using a distributed fiber optic sensor (FOS) system is demonstrated experimentally by testing concrete specimens in four-point bending. The sensor system consisted of an optical frequency domain reflectometry (OFDR) interrogator unit paired with an all-grating sensing fiber that was bonded to the surface of the concrete test specimen. Strain measurements with high spatial resolution of <10 mm were obtained at various points along a single fiber cable. Large strain values at the crack locations indicated strain concentrations that could be used to assess the crack growth. The distributed sensing system demonstrated the capability to detect localized, early stage cracks, with crack width smaller than 0.1 mm, well before they become observable by visual inspection.

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