Compact directional acoustic sensing using multi-fiber optical probes

2011 ◽  
Vol 130 (4) ◽  
pp. 2393-2393 ◽  
Author(s):  
Joseph Bucaro ◽  
Nicholas Lagakos ◽  
Brian Houston ◽  
Saikat Dey ◽  
Maxim Zalalutdinov
Keyword(s):  
Optical Probes ◽  
Acoustic Sensing ◽  
Fiber Optical

Annular Gap Bubble Column: Experimental Investigation and Computational Fluid Dynamics Modeling

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Giorgio Besagni ◽  
Gaël Raymond Guédon ◽  
Fabio Inzoli
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Regime ◽  
Bubble Column ◽  
Gas Holdup ◽  
Operating Conditions ◽  
Optical Probes ◽  
Annular Gap ◽  
Fiber Optical ◽  
Flow Visualizations

This paper investigates the countercurrent gas–liquid flow in an annular gap bubble column with a 0.24 m inner diameter by using experimental and numerical investigations. The two-phase flow is studied experimentally using flow visualizations, gas holdup measurements, and double fiber optical probes in the following range of operating conditions: superficial air velocities up to 0.23 m/s and superficial water velocities up to −0.11 m/s, corresponding to gas holdups up to 29%. The flow visualizations were used to observe the flow patterns and to obtain the bubble size distribution (BSD). The gas holdup measurements were used for investigating the flow regime transitions, and the double fiber optical probes were used to study the local flow phenomena. A computational fluid dynamics (CFD) Eulerian two-fluid modeling of the column operating in the bubbly flow regime is proposed using the commercial software ansys fluent. The three-dimensional (3D) transient simulations have been performed considering a set of nondrag forces and polydispersity. It is shown that the errors in the global holdup and in the local properties are below 7% and 16%, respectively, in the range considered.

Nd3+doped glass fluorescent-tip fiber optical probes for quantitative fluence rate dosimetry in biological tissue

1994 ◽  
Author(s):  
Lothar D. Lilge ◽  
Glenn N. Merberg ◽  
Ralph S. DaCosta ◽  
Brian C. Wilson
Keyword(s):  
Biological Tissue ◽  
Fluence Rate ◽  
Optical Probes ◽  
Fiber Optical ◽  
Doped Glass

Design and Property of Depth-Selective Fiber-Optical Probes Applied in Diffuse Reflection Measurement

2012 ◽  
Vol 32 (7) ◽  
pp. 0717001 ◽  
Author(s):  
李晨曦 Li Chenxi ◽  
赵会娟 Zhao Huijuan ◽  
郑家祥 Zheng Jiaxiang ◽  
徐可欣 Xu Kexin
Keyword(s):  
Diffuse Reflection ◽  
Optical Probes ◽  
Reflection Measurement ◽  
Fiber Optical

Parasitic element influence on laser driver performances for 1.3 μm fiber optical communication

1993 ◽  
Vol 3 (9) ◽  
pp. 1751-1759 ◽  
Author(s):  
N. Hassaine ◽  
K. Sauv ◽  
A. Konczykowska ◽  
R. Lefevre
Keyword(s):  
Optical Communication ◽  
Parasitic Element ◽  
Laser Driver ◽  
Fiber Optical ◽  
Fiber Optical Communication

Modelling Light Transmission in a Fiber-Optical Reflection System

2004 ◽  
Vol 9 (1) ◽  
pp. 55-63
Author(s):  
V. Kleiza
Keyword(s):  
Optical Sensors ◽  
Light Transmission ◽  
External Cavity ◽  
Linear Displacement ◽  
Fiber System ◽  
Light Emitting ◽  
Optical Media ◽  
Reflected Light ◽  
Fiber Optical ◽  
Fiber Optical Sensors

Light transmission in the reflection fiber system, located in external optical media, has been investigated for application as sensors. The system was simulated by different models, including external cavity parameters such as the distance between light emitting and receiving fibers and mirror positioning distance. The sensitivity to a linear displacement of the sensors was studied as a function of the distance between the tips of the light emitting fiber and the center of the pair reflected light collecting fibers, by positioning a mirror. Physical fundamentals and operating principles of the advanced fiber optical sensors were revealed.

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