Zobrazeno 1 - 10
of 151
pro vyhledávání: '"Peter John, Rodrigo"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-11 (2023)
Abstract Spatially resolved in situ monitoring of plankton can provide insights on the impacts of climate change on aquatic ecosystems due to their vital role in the biological carbon pump. However, high-resolution underwater imaging is technically c
Externí odkaz:
https://doaj.org/article/dd1a5a733a5e43f5974957f5b2e6dd6b
Publikováno v:
Remote Sensing, Vol 13, Iss 18, p 3716 (2021)
A novel continuous-wave (CW) direct detection lidar (DDL) is demonstrated to be capable of wind speed measurement 40 m away with an update rate of 4 Hz using a fiber-based scanning Fabry–Perot interferometer as an optical frequency discriminator. T
Externí odkaz:
https://doaj.org/article/aa3d66d3326343d29a1304941b68bc78
Autor:
Christian Rosenberg Petersen, Ole Bang, Peter Tidemand-Lichtenberg, Niels Møller Israelsen, Christian Pedersen, Peter John Rodrigo, Christos Markos, Getinet Woyessa
Publikováno v:
2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC).
Coatings science is constantly in development to meet the increasingly demanding requirements of the maritime industry. Consequently, there is a growing need for non-destructive testing (NDT) and imaging of coatings at all stages during development a
Autor:
Christian Petersen, Rasmus Hansen, Ole Bang, Getinet Woyessa, Peter Tidemand-Lichtenberg, Christian Pedersen, Niels Møller Israelsen, Peter John Rodrigo
Publikováno v:
Israelsen, N M, Rodrigo, P J, Petersen, C R, Woyessa, G, Hansen, R E, Tidemand-Lichtenberg, P, Pedersen, C & Bang, O 2021, ' High resolution mid-infrared optical coherence tomography with kHz line rate ', Optics Letters, vol. 46, no. 18, pp. 4558-4561 . https://doi.org/10.1364/OL.432765
We report on mid-infrared optical coherence tomography (OCT) at 4 µm based on collinear sum-frequency upconversion and promote the A-scan scan rate to 3 kHz. We demonstrate the increased imaging speed for two spectral realizations, one providing an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8038f8eb1d702de544cd59c1a9578d9
https://orbit.dtu.dk/en/publications/938b439f-6819-4f70-913f-c925ff304bcb
https://orbit.dtu.dk/en/publications/938b439f-6819-4f70-913f-c925ff304bcb
Autor:
Getinet Woyessa, Narayanan Rajagopalan, Christian Rosenberg Petersen, Niels Møller Israelsen, Peter John Rodrigo, Christos Markos, Peter Tidemand-Lichtenberg, Ole Bang, Søren Kiil, Christian Pedersen, Claus Erik Weinell
Publikováno v:
Petersen, C R, Rajagopalan, N, Markos, C, Israelsen, N M, Rodrigo, P J, Woyessa, G, Tidemand-Lichtenberg, P, Pedersen, C, Weinell, C E, Kiil, S & Bang, O 2021, ' Non-destructive subsurface inspection of marine and protective coatings using near-and mid-infrared optical coherence tomography ', Coatings, vol. 11, no. 8, 877 . https://doi.org/10.3390/coatings11080877
Coatings, Vol 11, Iss 877, p 877 (2021)
Coatings
Volume 11
Issue 8
Coatings, Vol 11, Iss 877, p 877 (2021)
Coatings
Volume 11
Issue 8
Near- and mid-infrared optical coherence tomography (OCT) is evaluated as a non-destructive and non-contact reflection imaging modality for inspection of industrial and marine coatings. Near-infrared OCT was used to obtain high-resolution images (~6/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb5fff17e2ace763cbd9cffd2e894a88
https://orbit.dtu.dk/en/publications/d1ce36ee-b711-411d-9d0b-e39e6b474638
https://orbit.dtu.dk/en/publications/d1ce36ee-b711-411d-9d0b-e39e6b474638
Autor:
Peter John Rodrigo, Einstom Engay
Publikováno v:
Engay, E & Rodrigo, P J 2020, ' Nonlinear optical vortex coronagraph ', Optics Letters, vol. 45, no. 6, pp. 1579-1582 . https://doi.org/10.1364/ol.383311
A nonlinear optical vortex coronagraph (n-OVC) based on sum-frequency generation (SFG) in a periodically poled lithium niobate (PPLN) crystal is presented. We demonstrate an n-OVC by mixing the image of an on-axis point source ( λ s = 1.6 µ m ) ins
Autor:
Mikkel Jensen, Günther Hannesschläger, Peter Tidemand-Lichtenberg, Getinet Woyessa, Christian Rosenberg Petersen, Niels Møller Israelsen, Peter John Rodrigo, Ajanta Barh, Christian Pedersen, Ole Bang, Adrian Gh. Podoleanu, Deepak Jain
Publikováno v:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII.
In this work we demonstrate spectrometer based mid-infrared (MIR) optical coherence tomography (OCT) at 4 µm but with an increase of state-of-the-art imaging speed by at least 10 times. The improvement is based on exploiting a chirped periodically p
Autor:
Thomas Nikolajsen, Thomas Kiørboe, Josefine Holm Nielsen, Mikkel Brydegaard, Christian Pedersen, Peter John Rodrigo
Publikováno v:
Nielsen, J H, Pedersen, C, Kiørboe, T, Nikolajsen, T, Brydegaard, M & Rodrigo, P J 2020, ' Dual-band fluorosensor for discriminating non-eating from algae-eating zooplankton in aquatic environments ', OSA Continuum, vol. 3, no. 7, pp. 1730-1738 . https://doi.org/10.1364/OSAC.389089
We present a fluorosensor for the detection of laser-induced autofluorescence of zooplankton in marine environments. The sensor uses an inexpensive 410 nm laser diode as excitation source and simultaneously measures two fluorescence bands, 500-550 nm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34a9665f90bed022bcdc33fda6b9bfb6
https://orbit.dtu.dk/en/publications/7812e1b4-de68-40ea-91e0-1c6a6479c8ab
https://orbit.dtu.dk/en/publications/7812e1b4-de68-40ea-91e0-1c6a6479c8ab
Publikováno v:
Barh, A, Rodrigo, P J, Meng, L, Pedersen, C & Tidemand-Lichtenberg, P 2019, ' Parametric upconversion imaging and its applications ', Advances in Optics and Photonics, vol. 11, no. 4, pp. 952-1019 . https://doi.org/10.1364/aop.11.000952
This paper provides an extensive survey of nonlinear parametric upconversion infrared (IR) imaging, from its origin to date. Upconversion imaging is a successful innovative technique for IR imaging in terms of sensitivity, speed, and noise performanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c240430d82f72f8fdc6e41e6739ad3f6
https://orbit.dtu.dk/en/publications/0f4d475b-407d-42a5-9c89-044ee506717d
https://orbit.dtu.dk/en/publications/0f4d475b-407d-42a5-9c89-044ee506717d
Publikováno v:
Applied Optics. 59:2157
Dark-field imaging is a well-known optical method for obtaining edge-enhanced images of objects containing steep gradients in either amplitude or phase. Edge enhancement is commonly achieved by using a small physical obstruction in the center of the