Results 111 to 120 of about 17,983,398 (214)

Distributed optical fibre sensing at 1.65µm using a Q-switched fibre laser

open access: yes
It is becoming increasingly vital to monitor telecommunication links during operation and installation process. By using a high peak power source and the optical time domain reflectometry (OTDR) technique operating at the wavelength region of 1.6µm, it ...
Newson, T.P., Kee, H.H., Lees, G.P.
core   +1 more source

Broadband Reflectometry: Theoretical Background

open access: yes, 2011
In this chapter, the basic approaches of broadband microwave reflectometry are described in detail. More specifically, time domain reflectometry (TDR) and frequency domain reflectometry (FDR) are presented and the involved instrumentation is fully ...
DE BENEDETTO, EGIDIO   +8 more
core   +1 more source

A Review of Multiparameter Fiber-Optic Distributed Sensing Techniques for Simultaneous Measurement of Temperature, Strain, and Environmental Effects

open access: yesSensors
This review summarizes recent progress and emerging trends in multiparameter optical fiber sensing, emphasizing techniques that enable the simultaneous measurement of temperature, strain, acoustic waves, pressure, and other environmental quantities ...
Artem Turov   +9 more
doaj   +1 more source

Cable fault detection based on enhanced spread spectrum time domain reflectometry

open access: yesAIP Advances
Spread spectrum time domain reflectometry (SSTDR) is applicable for cable fault detection, effectively ensuring the safety of power generation systems. However, the superposition effect between the reflected and incident signals can significantly disrupt
Xinwen Ma, Zhendong Yin
doaj   +1 more source

Advances in optical time domain reflectometry

open access: yes, 1984
In recent years, optical time-domain reflectometry (OTDR) has progressed from a laboratory experiment to a technique in everyday use by manufacturers and users of optical fibres.
Hartog, A.H.
core   +1 more source

Polarisation optical time domain reflectometry

open access: yesElectronics Letters, 1980
A proposed new optical fibre technique will allow measurement of the spatial distribution of physical fields, and will also allow location of anomalous features in single polarisation state monomode optical fibres such as are under discussion for very high bandwidth communication.
openaire   +1 more source

Using time domain reflectometry in stony forest soil

open access: yes, 2000
Forest soils often contain many large coarse fragments making it difficult to insert probes to measure soil water content. The ability of time domain reflectometry (TDR) to give reliable measurements of water content in soil with up to 40% coarse ...
D. L. Spittlehouse
core   +1 more source

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