scholarly journals Prospects for Fibreoptics in Future Telescope Instrumentation

1984 ◽  
Vol 79 ◽  
pp. 617-635 ◽  
Author(s):  
Glenn Lund
Keyword(s):  
Full Advantage ◽  
Optical Fibre ◽  
Optical Systems ◽  
Optical Fibres ◽  
Astronomical Instrumentation ◽  
The Past ◽  
Single Instrument

The importance and applied use of fibreoptics in astronomy has received rapidly growing attention in the past 5 years, particularly for instrumentation where the lightness, flexibility and simplicity of fibres, compared with classical optical systems, can be exploited to full advantage.Angel and Angel et al, who seem to be the first to have used an optical fibre to link a telescope to an instrument, also made the first proposal for the construction of a VLT (FLOAT) consisting of 40 independent mirrors linked to a single instrument via optical fibres. Since that time many authors, including Connes, Serkowski et al, Hubbard et al, Heacox, Hill et al, Vanderriest, Courtes, Tubbs et al, Gray, Lund et al, Schiffer, Watson et al, Vanderriest et al, and Felenbock et al, have proposed or reported various applications involving fibres with astronomical instrumentation.

scholarly journals In the Digital Age, Preserving the Print of the Past

2013 ◽  
Vol 59 (3) ◽  
Author(s):  
John Connolly
Keyword(s):  
Full Advantage ◽  
Digital Age ◽  
National Endowment ◽  
Media Communication ◽  
The Past

For the past 20 years, a project at the Library of Virginia in Richmond has been laboring to find and preserve a form of media communication that has been waning: Virginia’s newspapers. Under a grant from the National Endowment for the Humanities (NEH), the Virginia Newspaper Project (VNP) was established at the Library of Virginia in 1993 and continues its work today though it has evolved in order to take full advantage of the latest technology.

scholarly journals Instrumentation of Stratospheric Balloon Straps with Optical Fibre for Temperature and Strain Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1433 ◽  
Author(s):  
Yann Lecieux ◽  
Cyril Lupi ◽  
Dominique Leduc ◽  
Quentin Macé ◽  
Valentin Jeanneau ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Pressure Field ◽  
Numerical Models ◽  
Industrial Process ◽  
Mechanical Tests ◽  
Optical Fibres ◽  
Frequency Shifts ◽  
Strain Monitoring ◽  
Stratospheric Balloon

This article is devoted to the instrumentation, with optical fibres, of the straps holding the envelope of stratospheric balloons. This instrumentation is motivated in the first instance by the need to validate the numerical models used in the design of balloons. It must also be used to measure the temperature along the envelope in order to deduce the pressure field. It is shown at first that the optical fibres can be inserted inside a strap during its fabrication. Different kinds of insertion are considered, none of them perturb the industrial process. The instrumented straps were then submitted to thermal and mechanical tests and the distributed Brillouin frequency shifts were measured. We thus determined the type of insertion to be used according to the parameter (temperature or strain) to be measured and assessed the performance of the measurement chain.

scholarly journals Implications of information theory in optical fibre communications

2016 ◽  
Vol 374 (2062) ◽  
pp. 20140438 ◽  
Author(s):  
Erik Agrell ◽  
Alex Alvarado ◽  
Frank R. Kschischang
Keyword(s):  
Information Theory ◽  
Optical Fibre ◽  
Optical Fibres ◽  
Limited Capacity ◽  
Fibre Optic ◽  
Precious Resource ◽  
Basic Concepts

Recent decades have witnessed steady improvements in our ability to harness the information-carrying capability of optical fibres. Will this process continue, or will progress eventually stall? Information theory predicts that all channels have a limited capacity depending on the available transmission resources, and thus it is inevitable that the pace of improvements will slow. However, information theory also provides insights into how transmission resources should, in principle, best be exploited, and thus may serve as a guide for where to look for better ways to squeeze more out of a precious resource. This tutorial paper reviews the basic concepts of information theory and their application in fibre-optic communications.

Microwave-frequency carriers on optical fibres

1989 ◽  
Vol 329 (1603) ◽  
pp. 23-36 ◽  
Keyword(s):  
Optical Fibre ◽  
Microwave Frequency ◽  
Optical Fibres ◽  
New Approach ◽  
Large Bandwidth ◽  
Design Flexibility ◽  
Baseband Signal ◽  
Microwave Multiplexing ◽  
Voice Data ◽  
Natural Way

The use of microwave carrier frequencies in wideband optical-fibre networks is a promising new approach to the distribution of voice, data and video services to subscribers. This paper discusses the general features and design rules of microwave multiplexed wideband optical-fibre systems and reports on several specific systems developed at GTE Laboratories. These include transmission of 60 frequency modulated (FM) video channels multiplexed on carriers in the 2.7-5.2 GHz band, and the transmission of 20 frequency-shift-keyed (FSK) 100 Mb s -1 digital video channels in the 2-6 GHz band. A hybrid system is also described that transmits a 100 Mb s -1 baseband signal in addition to the 60 FM video channels. These transmission experiments illustrate the large bandwidth capability and design flexibility of microwave-multiplexed lightwave systems. As lightwave systems push towards larger and larger bandwidths, microwave-multiplexing may emerge as the more natural way to exploit the enormous bandwidth of lightwave components.

scholarly journals Optical Fibres in Radioastronomy

1994 ◽  
Vol 158 ◽  
pp. 227-234
Author(s):  
Alan C. Young
Keyword(s):  
Optical Fibre ◽  
Optical Fibres ◽  
Computer Communications ◽  
Reference Signals

Within the recently completed Australia Telescope, optical fibres are used extensively to carry wideband IF data, LO reference signals, timing signals and computer communications. This paper discusses the various options considered in the design of the optical fibre system.

scholarly journals Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2294 ◽  
Author(s):  
Sergiy Korposh ◽  
Stephen James ◽  
Seung-Woo Lee ◽  
Ralph Tatam
Keyword(s):  
Optical Fibre ◽  
Evanescent Wave ◽  
Environmental Parameters ◽  
Physical Parameters ◽  
Optical Fibres ◽  
Future Perspectives ◽  
Current Trends ◽  
Physical Chemical ◽  
Sensing Platform ◽  
Sensing Platforms

The development of reliable, affordable and efficient sensors is a key step in providing tools for efficient monitoring of critical environmental parameters. This review focuses on the use of tapered optical fibres as an environmental sensing platform. Tapered fibres allow access to the evanescent wave of the propagating mode, which can be exploited to facilitate chemical sensing by spectroscopic evaluation of the medium surrounding the optical fibre, by measurement of the refractive index of the medium, or by coupling to other waveguides formed of chemically sensitive materials. In addition, the reduced diameter of the tapered section of the optical fibre can offer benefits when measuring physical parameters such as strain and temperature. A review of the basic sensing platforms implemented using tapered optical fibres and their application for development of fibre-optic physical, chemical and bio-sensors is presented.

Integration of Optical Fibres into Textile Products

2011 ◽  
Vol 222 ◽  
pp. 162-165 ◽  
Author(s):  
Inese Parkova ◽  
Alexander Valishevskis ◽  
Inese Ziemele ◽  
Ausma Vilumsone
Keyword(s):  
Wireless Communication ◽  
Optical Fibre ◽  
The Other ◽  
Optical Fibres ◽  
Smart Clothing ◽  
Other Hand ◽  
Avr Microcontroller ◽  
External Stimuli ◽  
The Given ◽  
Output Interface

There have been developed a children’s smart clothing prototype reacting to microclimate changes by signalling with the help of an optical fibre fabric output interface and a mother’s purse receiving the given data via wireless communication and displaying it on an LCD screen. During the research, the optical fibre fabric was tested in order to determine its reaction to external stimuli and define its layout within clothes. Child jacket’s logic was based on Arduino LilyPad. On the other hand, AVR microcontroller was used in pursue, which yielded a more economical and compact solution, although it was not as developer-friendly as LilyPad.

Scattering patterns from thin optical fibres

1980 ◽  
Vol 58 (12) ◽  
pp. 1698-1702
Author(s):  
John W. Y. Lit
Keyword(s):  
Quality Control ◽  
Refractive Index ◽  
Light Scattering ◽  
Optical Fibre ◽  
Electromagnetic Waves ◽  
Scattered Light ◽  
Fibre Axis ◽  
Optical Fibres

The light scattering property of a thin optical fibre is studied theoretically. Plane polarized electromagnetic waves with their E-vector and H-vector parallel to the fibre axis are considered to fall perpendicularly on the fibre. Selected maxima and minima in the scattered light patterns are found to be very sensitive to the fibre parameters. The results may be used as a sensitive quality control of the fibre radius or refractive index while the fibre is being drawn.

scholarly journals Optical Fibre-Enabled Photoswitching for Localised Activation of an Anti-Cancer Therapeutic Drug

2021 ◽  
Vol 22 (19) ◽  
pp. 10844
Author(s):  
Kathryn A. Palasis ◽  
Noor A. Lokman ◽  
Bryden C. Quirk ◽  
Alaknanda Adwal ◽  
Loretta Scolaro ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Fluorescent Microscopy ◽  
Cancer Drug ◽  
Therapeutic Drug ◽  
Optical Fibres ◽  
Cancer Cell Death ◽  
Anti Cancer ◽  
Colorectal Cancer Cells ◽  
Hct 116

Local activation of an anti-cancer drug when and where needed can improve selectivity and reduce undesirable side effects. Photoswitchable drugs can be selectively switched between active and inactive states by illumination with light; however, the clinical development of these drugs has been restricted by the difficulty in delivering light deep into tissue where needed. Optical fibres have great potential for light delivery in vivo, but their use in facilitating photoswitching in anti-cancer compounds has not yet been explored. In this paper, a photoswitchable chemotherapeutic is switched using an optical fibre, and the cytotoxicity of each state is measured against HCT-116 colorectal cancer cells. The performance of optical-fibre-enabled photoswitching is characterised through its dose response. The UV–Vis spectra confirm light delivered by an optical fibre effectively enables photoswitching. The activated drug is shown to be twice as effective as the inactive drug in causing cancer cell death, characterised using an MTT assay and fluorescent microscopy. This is the first study in which a photoswitchable anti-cancer compound is switched using an optical fibre and demonstrates the feasibility of using optical fibres to activate photoswitchable drugs for potential future clinical applications.

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