Cost-effective assembly of a basic fiber-optic hydrophone for measurement of high-amplitude therapeutic ultrasound fields

2006 ◽  
Vol 119 (3) ◽  
pp. 1432-1440 ◽  
Author(s):  
Jessica E. Parsons ◽  
Charles A. Cain ◽  
J. Brian Fowlkes
Keyword(s):  
Fiber Optic ◽  
Therapeutic Ultrasound ◽  
Cost Effective ◽  
High Amplitude

Plasma enhanced label-free immunoassay for alpha-fetoprotein based on a U-bend fiber-optic LSPR biosensor

RSC Advances ◽  
2015 ◽  
Vol 5 (31) ◽  
pp. 23990-23998 ◽  
Author(s):  
Gaoling Liang ◽  
Zhongjun Zhao ◽  
Yin Wei ◽  
Kunping Liu ◽  
Wenqian Hou ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Fiber Optic ◽  
Cost Effective ◽  
Alpha Fetoprotein ◽  
Localized Surface Plasmon ◽  
Label Free

A simple, label-free and cost-effective localized surface plasmon resonance (LSPR) immunosensing method was developed for detection of alpha-fetoprotein (AFP).

Detecting and Correcting Pipeline Leaks Before They Become a Big Problem

2015 ◽  
Vol 49 (1) ◽  
pp. 31-46 ◽  
Author(s):  
Ron Cramer ◽  
David Shaw ◽  
Robert Tulalian ◽  
Pabs Angelo ◽  
Maarten van Stuijvenberg
Keyword(s):  
Acoustic Wave ◽  
Real Time ◽  
Fiber Optic ◽  
Cost Effective ◽  
Leak Detection ◽  
Rate Of Change ◽  
Fiber Optic Cable ◽  
History Of ◽  
Distributed Acoustic Sensing ◽  
Critical Lines

AbstractTimely pipeline leak detection is a significant business issue in view of a long history of catastrophic incidents and growing intolerance for such events. It is vital to flag containment loss and location quickly, credibly, and reliably for all green or brown field critical lines in order to shut down the line safely and isolate the leak. Pipelines are designed to transport hydrocarbons safely; however, leaks have severe safety, economic, environmental, and reputational effects. This paper will highlight robust, reliable, and cost-effective methods, most of which leverage real-time instrumentation, telecommunications, SCADA, DCS, and associated online leak detection applications. The purpose of this paper will be to review the underlying leak detection business issues, catalogue the functional challenges, and describe experiences with available technologies. Internal and external techniques will be described, including basic rate of change of flow and pressure, compensated mass balance, statistical, real-time transient modeling, acoustic wave sensing, fiber optic cable (distributed temperature, distributed acoustic sensing), and subsea hydrophones. The paper will also describe related credibility, deployment, organizational, and maintenance issues with an emphasis on upstream applications. The scope will include leak detection for pipelines conveying various flowing fluids—gas, liquid, and multiphase flow. Pipeline environments will include subsea and onshore. Advantages, disadvantages, and experiences with these techniques will be described and analyzed.

An effective imaging condition for reverse-time migration using wavefield decomposition

Geophysics ◽  
2011 ◽  
Vol 76 (1) ◽  
pp. S29-S39 ◽  
Author(s):  
Faqi Liu ◽  
Guanquan Zhang ◽  
Scott A. Morton ◽  
Jacques P. Leveille
Keyword(s):  
Low Frequency ◽  
Real Data ◽  
Cost Effective ◽  
High Amplitude ◽  
Reverse Time ◽  
Reverse Time Migration ◽  
Imaging Condition ◽  
Velocity Models ◽  
Time Migration ◽  
Computationally Intensive

Reverse-time migration (RTM) exhibits great superiority over other imaging algorithms in handling steeply dipping structures and complicated velocity models. However, low-frequency, high-amplitude noises commonly seen in a typical RTM image have been one of the major concerns because they can seriously contaminate the signals in the image if they are not handled properly. We propose a new imaging condition to effectively and efficiently eliminate these specific noises from the image. The method works by first decomposing the source and receiver wavefields to their one-way propagation components, followed by applying a correlation-based imaging condition to the appropriate combinations of the decomposed wavefields. We first give the physical explanation of the principle of such noises in the conventional RTM image. Then we provide the detailed mathematical theory for the new imaging condition. Finally, we propose an efficient scheme for its numerical implementation. It replaces the computationally intensive decomposition with the cost-effective Hilbert transform, which significantly improves the efficiency of the imaging condition. Applications to various synthetic and real data sets demonstrate that this new imaging condition can effectively remove the undesired low-frequency noises in the image.

scholarly journals A highly compact and cost-effective 2-beamsuper-resolution structured illuminationmicroscope based on all-fiber optic components

2021 ◽  
Author(s):  
Thomas Huser ◽  
Jakub Pospisil ◽  
Karel Fliegel ◽  
Miloš Klíma ◽  
Gerd Wiebusch
Keyword(s):  
Fiber Optic ◽  
Cost Effective

Hybrid Solar Lighting System Cost and Performance Analysis

2001 ◽  
Author(s):  
Michael T. Panich ◽  
Eric E. Carlson ◽  
Michael F. Jerla
Keyword(s):  
Solar Radiation ◽  
Fiber Optic ◽  
Tracking System ◽  
Cost Effective ◽  
Photovoltaic Cell ◽  
Commercial Building ◽  
Full Spectrum ◽  
Electric System ◽  
Solar Lighting ◽  
And Performance

Abstract This paper reports on the methodology and results of a preliminary analysis of a hybrid solar lighting concept that has the potential to provide cost-effective topside daylighting to the core areas of commercial buildings of all types. The presented hybrid lighting concept also includes a “full spectrum” dish-type concentrating solar collector. This collector uses both the incident visible and infrared solar radiation to provide both daylighting and electric power. The incident solar radiation is separated using cold mirror technology. Visible light is sent to a fiber optic bundle for routing to integrated fiber optic/fluorescent luminaires within the building. Separated infrared solar radiation is focused on a photovoltaic cell and converted to electricity. The electricity produced provides self-powering of the collector solar tracking system and the excess electricity produced is sent into the grid-connected commercial building electric system. The paper presents the potential for performance increases/cost reductions in the technology and the current and future cost competitiveness of this promising solar technology.

scholarly journals Based on FP LDs with split band technique in two-channel fiber optical CATV transport system

2018 ◽  
Vol 185 ◽  
pp. 00015
Author(s):  
Wen-Shing Tsai ◽  
Hong-Yu Dai ◽  
Chung-Yi Li
Keyword(s):  
Transport System ◽  
Fiber Optic ◽  
Single Mode ◽  
Cost Effective ◽  
Single Mode Fiber ◽  
Transport Systems ◽  
Transmission Scheme ◽  
Fabry Perot ◽  
Fiber Optical ◽  
Split Band

This study proposes a two-channel fiber optic cable television (CATV) transport system based on Fabry–Perot laser diodes (FP-LDs) with a split band technique. To reduce the interference between channels, we apply the split band technique to two channels with different frequencies by using two converters at each moment. In this two-channel transmission scheme, composite second-order (CSO) and composite triple-beat (CTB) distortions induced by the systems are possibly confined in unused channels and result in good transmission performances. Through a 40 km standard single-mode fiber transmission, excellent performances of carrier-to-noise ratio (≥50 dB), CSO (≥70 dB), and CTB (≥72 dB) are obtained using the proposed fiber optic CATV transport systems. The proposed systems employing FP-LDs with a split band technique are also simpler and more cost effective than conventional externally modulated systems.

scholarly journals Enhanced Distributed Fiber Optic Vibration Sensing and Simultaneous Temperature Gradient Sensing Using Traditional C-OTDR and Structured Fiber with Scattering Dots

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4114 ◽  
Author(s):  
Konstantin Hicke ◽  
René Eisermann ◽  
Sebastian Chruscicki
Keyword(s):  
Fiber Optic ◽  
Low Frequency ◽  
Single Mode ◽  
Cost Effective ◽  
Time Domain Reflectometry ◽  
Gradient Sensing ◽  
Beneficial Effects ◽  
Vibration Sensing ◽  
Optical Time ◽  
And Performance

We present results demonstrating several beneficial effects on distributed fiber optic vibration sensing (DVS) functionality and performance resulting from utilizing standard single mode optical fiber (SMF) with femtosecond laser-inscribed equally-spaced simple scattering dots. This modification is particularly useful when using traditional single-wavelength amplitude-based coherent optical time domain reflectometry (C-OTDR) as sensing method. Local sensitivity is increased in quasi-distributed interferometric sensing zones which are formed by the fiber segments between subsequent pairs of the scattering dots. The otherwise nonlinear transfer function is overwritten with that of an ordinary two-beam interferometer. This linearizes the phase response to monotonous temperature variations. Furthermore, sensitivity fading is mitigated and the demodulation of low-frequency signals is enabled. The modification also allows for the quantitative determination of local temperature gradients directly from the C-OTDR intensity traces. The dots’ reflectivities and thus the induced attenuation can be tuned via the inscription process parameters. Our approach is a simple, robust and cost-effective way to gain these sensing improvements without the need for more sophisticated interrogator technology or more complex fiber structuring, e.g., based on ultra-weak FBG arrays. Our claims are substantiated by experimental evidence.

Sign in / Sign up

Export Citation Format

Share Document