Zobrazeno 1 - 10
of 120
pro vyhledávání: '"Alayn Loayssa"'
Publikováno v:
Sensors, Vol 23, Iss 6, p 3127 (2023)
We introduce a novel long-range traffic monitoring system for vehicle detection, tracking, and classification based on fiber-optic distributed acoustic sensing (DAS). High resolution and long range are provided by the use of an optimized setup incorp
Externí odkaz:
https://doaj.org/article/c816db6f812047afa58ff5ab229b2117
Publikováno v:
IEEE Photonics Journal, Vol 9, Iss 3, Pp 1-10 (2017)
We present two techniques that provide an extension of the dynamic range of coherent Brillouin optical time-domain analysis (BOTDA) sensors for dynamic measurements. These types of BOTDA sensors rely on self-heterodyne detection of a phase-modulated
Externí odkaz:
https://doaj.org/article/e8e3dddbeca7430390c19faac8ab9b8f
Publikováno v:
IEEE Photonics Journal, Vol 9, Iss 5, Pp 1-12 (2017)
We report on an additional limitation that has been found in Brillouin optical time-domain analysis (BOTDA) sensors due to the so-called second-order nonlocal effects (NLE). Second-order NLE appear in BOTDA setups that deploy a double probe waves to
Externí odkaz:
https://doaj.org/article/0fadf997cf304f4f902e2dd0426a5e30
Autor:
Ruben Ruiz-Lombera, Javier Urricelqui, Mikel Sagues, Jesus Mirapeix, Jose M. Lopez-Higuera, Alayn Loayssa
Publikováno v:
IEEE Photonics Journal, Vol 7, Iss 6, Pp 1-9 (2015)
We demonstrate, for the first time to our knowledge, a Brillouin optical time-domain analysis (BOTDA) sensor that is able to operate with a probe power larger than the Brillouin threshold of the deployed sensing fiber and that is free from detrimenta
Externí odkaz:
https://doaj.org/article/22dd28aad5b34094bef67e9d95edf563
Autor:
Mikel Bravo, Angel Ullan, Ander Zornoza, Alayn Loayssa, Manuel Lopez-Amo, Jose Miguel Lopez-Higuera
Publikováno v:
Sensors, Vol 13, Iss 12, Pp 17434-17444 (2013)
We propose and demonstrate the use of spatial multiplexing as a means to reduce the costs of distributed sensing networks. We propose a new scheme in which remote power-by-light switching is deployed to scan multiple branches of a distributed sensing
Externí odkaz:
https://doaj.org/article/b694d42b828f4cfaabfa11944bd74dfd
Publikováno v:
Applied Sciences, Vol 7, Iss 8, p 761 (2017)
Brillouin optical time-domain analysis (BOTDA) sensors have great potential to provide distributed measurements of temperature and strain over large structures with high spatial resolution and measurement precision. However, their performance ultimat
Externí odkaz:
https://doaj.org/article/51269e26adc54471ab8c3fe0c2d4362b
We introduce a method to compensate for the deleterious effects of the phase noise of the laser source on long-range distributed acoustic sensors (DAS) that implement optical pulse compression (OPC). Pulse compression can be used in coherent optical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::305f8d14a1a64d21eddfded305e4adc1
https://hdl.handle.net/2454/45702
https://hdl.handle.net/2454/45702
Autor:
Alayn Loayssa
Publikováno v:
Optical Fibre Sensors
Fibre‐optic point sensors can be certainly regarded as a significant advancement for structural health monitoring (SHM) over the use of conventional electrical sensors. This chapter provides a brief introduction to the fundamentals of distributed f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6fc3b22dbb0d27d2866775f0eba496d4
https://doi.org/10.1002/9781119534730.ch5
https://doi.org/10.1002/9781119534730.ch5
We introduce a technique to compensate the performance impairments due to the laser phase noise in long-range pulse-compression DAS sensors. Experiments demonstrate the use of the longest duration pulse compression waveform to date. This work was sup
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6791d10a9449aeaed78ae2e10c2d394e
https://hdl.handle.net/2454/45311
https://hdl.handle.net/2454/45311
Publikováno v:
Optics express. 29(4)
We demonstrate a two-wavelength differential-phase-measuring OTDR sensor that uses perfect periodic correlation phase codes to enhance the measurement performance. The two-wavelength technique extends the measurement range of OTDR sensors by synthesi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d028a8b8557455add76a3e20227aba8
https://pubmed.ncbi.nlm.nih.gov/33726133
https://pubmed.ncbi.nlm.nih.gov/33726133