Luís Carlos Coelho
Luís Carlos Costa Coelho received his graduation in Physics Engineering in 2006 and MSc in Instrumentation and Microelectronics in 2007 both by University of Coimbra in Portugal. At the Physics Department of the same University he developed research in Atomic and Nuclear Instrumentation with focus on gaseous scintillation counters towards high energy radiation. In this context he was directly involved in the international experience "Xenon Direct Dark Matter Search" at the National Laboratory of Gran Sasso in Italy, aiming search dark matter through the detection of weakly interacting massive particles. In 2010 he started to working in optical fibre sensors at the Optoelectronics and Electronic Systems of INESC Porto in Portugal, mainly applied to hydrogen detection under the project MICROPHYTE-Metabolic engineering of chlamydomonas and environmental optimization for hydrogen production and release. In 2016 received his Ph.D. degree in Physics at the University of Porto, Porto, Portugal with the focus on thin films technology applied to optical fibre sensors in collaboration with the now Centre for Applied Photonics of INESC TEC, Porto, Portugal. He?s research involves the study of coating types for gases and liquids detection, in particular hydrogen, for refractometers with surface plasmon resonance and for high refractive index samples monitoring with coated long period fibre gratings. He?s current research interests includes bio and chemical sensors based on thin film coating technology of particular structures as long period fibre gratings, fibre Bragg gratings, using surface plasmon resonance phenomenon. He is currently a Post-doc Researcher working in the project MARINEYE at INESC TEC ? A prototype for multitrophic oceanic monitoring developing sensors for dissolved carbon dioxide detection using colorimetric and refractometer platforms combined with new designs of optical fibre structures. In the last few years, he has published more than 47 papers in international journals with referee and over 35 papers in national and international conferences with more than 1350 citations and an h index of 13. He has been referee in a wide range of international journals as IEEE, OSA, SPIE, Elsevier, Pier, MDPI and Springer. He was also the president of the University of Porto SPIE Student Chapter in 2014 and a member of the organization team of the 9th Advanced Study Course on Optical Chemical Sensors and Biosensors (ASCOS 2015). Luis Coelho is a member of SPIE.
luis.c.coelho@inesctec.pt
SolSensors
Development of advanced fibre optic sensors to monitor the durability of concrete and reinforced concrete structures
FOOD4U
Real-time monitoring of fresh food quality with optical sensors
CORAL-SENSORS
SAFEWATER
On chip whispering gallery mode optical microcavities for emerging microcontaminant determination in waters
AGRINUPES
Integrated monitoring and control of water, nutrients and plant protection products towards a sustainable agricultural sector
Sail2020
Space-Atmosphere-Ocean Interactions in the marine boundary Layer
Femtosecond laser micromachining of Fabry-Perot interferometers in SMF-28 fiber for pressure sensing (Conference Presentation)
Viveiros, D; Almeida, JMd; Coelho, L; Maia, JM; Amorim, VA; Vasconcelos, H; Jorge, PAS; Marques, PVS;
Optical Sensing and Detection VI
Femtosecond laser-written long period fibre gratings coated with titanium dioxide for improved sensitivity
Viveiros, D; De Almeida, JMMM; Coelho, L; Vasconcelos, H; Amorim, VA; Maia, JM; Jorge, PAS; Marques, PVS;
Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing
Viveiros, D; de Almeida, JMMM; Coelho, L; Vasconcelos, H; Maia, JM; Amorim, VA; Jorge, PAS; Marques, PVS;
Long period fiber gratings (LPFGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond (fs) laser direct writing. LPFGs with longer and shorter periods were fabricated, which allows coupling from the fundamental core mode to lower and higher order asymmetric cladding modes (LP1,6 and LP1,12, respectively). For the grating periods of 182.7 and 192.5 µm, it was verified that the LP1,12 mode exhibits a TAP at approximately 1380 and 1448 nm in air and water, respectively. Characterization of the LPFGs subjected to high-temperature thermal treatment was accomplished. Fine-tuning of the resonance band's position and thermal stability up to 600 °C was shown. The temperature sensitivity was characterized for the gratings with different periods and for different temperature ranges. A maximum sensitivity of -180.73, and 179.29 pm/°C was obtained for the two resonances of the 182.7 µm TAP LPFG, in the range between 250 and 600 °C.
Preliminary assessment on the detection of putrescine using long period fiber gratings coated with titanium dioxide and poly(ethylene-co-vinyl acetate)
Vasconcelos, H; Almeida, JMMM; Saraiva, C; Viveiros, D; Jorge, PAS; Coelho, L;
Proceedings of SPIE - The International Society for Optical Engineering
Biogenic amines, such as putrescine are potential indicators of food storage condition and deterioration. The real time measurement of their concentration in food may become an important method of food control. It was found that putrescine diffuses through a thin layer made from a solution of Poly(ethylene-co-vinyl acetate) (PEVA) and maleic anhydride. Poly(ethylene-co-vinyl acetate) is a common non-chlorinated vinyl capable to adsorb specific analytes as putrescine which upon diffusion, reversibly binds to the maleic anhydride causing the polymer swelling resulting in spectral changes from the optical point of view. Long Period Fiber Gratings coated with 30 nm titanium dioxide, a high refractive index material used to increase the intrinsic sensitivity to the external refractive index, were overcoated with a thin layer of maleic anhydride doped Poly(ethylene-co-vinyl acetate). When exposed to solutions containing small concentrations of putrescine the resonant band corresponding to the LP1,6 cladding mode was found to move to shorter wavelengths. The observed blue shift corresponds to the increasing concentration of putrescine in the fiber sensor structure. Further work is being carried out to improve the sensitivity and the limit of detection of the sensing system as well as to increase range of operation, which is presently limited to 0.3 to 0.5 M. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Low-cost interrogation system for long-period fiber gratings applied to remote sensing
dos Santos, PSS; Jorge, PAS; de Almeida, JMMM; Coelho, L;
Sensors (Switzerland)
We present a portable and low-cost system for interrogation of long-period fiber gratings (LPFGs) costing around a 30th of the price of a typical setup using an optical spectrum analyzer and a broadband light source. The unit is capable of performing real-time monitoring or as a stand-alone data-logger. The proposed technique uses three thermally modulated fiber-coupled laser diodes, sweeping a few nanometers around their central wavelength. The light signal is then modulated by the LPFG and its intensity is acquired by a single photo-detector. Through curve-fitting algorithms the sensor transmission spectrum is reconstructed. Testing and validation were accomplished by inducing variations in the spectral features of an LPFG through changes either in external air temperature from 22 to 425 °C or in refractive index (RI) of the surrounding medium from 1.3000 to 1.4240. A dynamic resolution between 3.5 and 1.9 °C was achieved, in temperatures from 125 to 325 °C. In RI measurements, maximum wavelength and optical power deviations of 2.75 nm and 2.86 dB, respectively, were obtained in the range from 1530 to 1570 nm. The worse RI resolution obtained was 3.47 × 10 -3 . The interrogation platform was then applied in the detection of iron corrosion, expressing wavelength peak values within 1.12 nm from the real value in the region between 1530 and 1570 nm. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Supervised
Supervised Thesis
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Development of a low-cost interrogation system platform for corrosion sensors in offshore metallic structures
Paulo Sérgio Soares dos Santos