Results 1 to 10 of about 17,983,398 (214)

Optomechanical time-domain reflectometry [PDF]

open access: yesNature Communications, 2018
AbstractOptical fibres constitute an exceptional sensing platform. However, standard fibres present an inherent sensing challenge: they confine light to an inner core. Consequently, distributed fibre sensors are restricted to the measurement of conditions that prevail within the core. This work presents distributed analysis of media outside unmodified,
Bashan, Gil   +4 more
europepmc   +5 more sources

Time-domain Statistics of the Electromagnetic Bias in GNSS-Reflectometry [PDF]

open access: yesRemote Sensing, 2015
Global Navigation Satellite Systems-Reflectometry (GNSS-R) is an emerging remote sensing technique that uses navigation signals reflected on the Earth’s surface as sources of opportunity for scatterometry and altimetry. The time-domain statistics of the electromagnetic bias in GNSS-R altimetry are investigated to assess the residual electromagnetic ...
Ghavidel, Ali   +1 more
doaj   +7 more sources

Phase-sensitive optical time domain reflectometry based on geometric phase measurement. [PDF]

open access: yesSci Rep, 2023
A phase-sensitive optical time domain reflectometer based on coherent heterodyne detection of geometric phase in the beat signal of light, is reported for the first time to our knowledge.
Shaheen S, Hicke K, Krebber K.
europepmc   +2 more sources

Application of Intensity-Based Coherent Optical Time Domain Reflectometry to Bridge Monitoring. [PDF]

open access: yesSensors (Basel), 2022
Although distributed fiber sensing techniques have been widely used in structural health monitoring, the measurement results of bridge monitoring, particularly under destructive testing, have rarely been reported. To the best of our knowledge, this paper
Lu X   +4 more
europepmc   +2 more sources

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse. [PDF]

open access: yesSensors (Basel), 2023
In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor.
Li Z   +5 more
europepmc   +2 more sources

Microwave time domain reflectometry

open access: yesElectronics Letters, 2005
A new time domain reflectometry algorithm is presented. It is intended for identification of the impedance profile of the non-uniform lossless transmission line. Experimental results are presented to illustrate the validity of this new technique.
openaire   +1 more source

An Assimilated Time Domain Reflectometry Probe

open access: yesVadose Zone Journal, 2015
Core Ideas We introduce a calibration procedure for a non‐penetrating TDR probe. The measured dielectric permittivity is a volume average of the soil and the ...
Hanna Ouaknin   +3 more
openaire   +1 more source

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