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Your search keyword '"Navarrete, M.-C."' showing total 22 results
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22 results on '"Navarrete, M.-C."'

15. A fibre-optic temperature sensor based on the deposition of a thermochromic material on an adiabatic taper.

Author

Díaz-Herrera, N., Navarrete, M. C., Esteban, O., and González-Cano, A.

Subjects
OPTICAL fiber detectors, TEMPERATURE measurements, LIQUIDS, OPTICAL properties
Abstract

A fibre-optic sensor has been developed for the measurement of temperature, especially of liquids. The device is conceived as part of an all-optical CTD probe for the control of the physical parameters of a marine medium. The dependence on temperature of the optical properties (specifically, absorbance) of a thermochromic material, namely lophine (2,4,5-triphenylimidazole), is the basis of the sensor. The sensor presents some significant differences with respect to other similar sensors proposed in the literature: the use of adiabatic, long, tapered optical fibres with adjustable geometric parameters; the use of LED illumination in the 800 nm range; improvements in the deposition technique, etc. The sensors show a linear behaviour over the desired temperature range, and their sensitivity is high. Also, the dependence of the response of the sensor with variations of the geometry of the tapers is discussed. Specifically, we have performed measurements with different diameters of the taper waist, and we show the dependence of the slope of the response curve with that parameter. [ABSTRACT FROM AUTHOR]

Published
2004
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16. Improved performance of SPR optical fiber sensors with InN as dielectric cover

Author

Esteban, Ó., Naranjo, F. B., Díaz-Herrera, N., Valdueza-Felip, S., Navarrete, M. C., and González Cano, A.

Abstract

In this work, the performance of uniform-waist tapered optical fiber sensors based on SPR with Indium Nitride (InN) as dielectric layer has been experimentally studied. The obtained results show that the overall performance in terms of reliability, long term stability and sensitivity is improved. Furthermore, the dependence of the sensitivity with the thickness of the dielectric layer is also studied, showing that increases as the thickness decreases while the well known trend to excite the surface plasmons at longer wavelengths or higher refractive index of the outer medium is kept. Thus, a novel application of the InN to optical fiber sensors is demonstrated. The use of this material would be of great interest to produce new, improved, SPR-based devices for chemical and biological sensing.

Published
2011
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17. An experimental evaluation of the behavior of SPR fiber sensors in absorptive medium when plasmons are tuned to absorption peaks: method for selective measurement

Author

Leite, I., Navarrete, M. C., Díaz-Herrera, N., Gonzalez Cano, A., and Esteban, O.

Abstract

In this work we present experimental results that confirm the influence of an absorptive surrounding medium in the behavior of conventional SPR fiber sensors. It can be observed that when a plasmon resonance coincides with a wavelength absorbed by the medium, the depth of the dip is affected, as predicted in the simulations. The results are important from the basic point of view, since the influence of absorptive medium in plasma waves has not been sufficiently studied up to date and they can also be used as the basis for a new method of SPR-based refractometry selective to specific analytes without the need of the addition of recognizing elements to the transducer.

Published
2011
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18. Multiparametric in-situ spectroscopic measuring system for coastal monitoring employed under field conditions in the Gulf of Gdańsk (Baltic Sea)

Author

Kronfeldt, H. -D, Schmidt, H., Maiwald, M., Gallasch, L. -H, Konat-Stepowicz, J., Lehaître, M., Lenoac H, A., Pfannkuche, J., Amann, H., Szymczak-Zyła, M., Filipkowska, A., Ludwik Lubecki, Kowalewska, G., Esteban, O., Navarrete, M. -C, Díaz-Herrera, N., González-Cano, A., Bernabeu, E., Gibson, C., Mac Craith, B., Leclercq, M., and Roussel, B.

19. Miniature fiber Bragg grating strain rosette based on lossless tapers

Author

Viegas, D., Navarrete, M. C., Díaz-Herrera, N., González-Cano, A., Santos, J. L., and Araújo, F. M.

Abstract

A miniature fiber Bragg grating strain rosette is presented. The proposed design is made possible through the development of low curvature radius lossless tapers, thus offering advantages in miniaturization of the rosette configuration. We report on the experimental validation of the miniature rosette design, demonstrating its effective operation.

Published
2011
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22. [Undergraduate teaching of internal medicine in a private hospital].

Author

Vukusich C A, Larrea G R, Alamo T M, Ponce M JC, Valls G G, González T C, Bidegain G F, Gutiérrez M M, Rivera K M, Vargas D A, Navarrete M C, Góngora R J, Goldin G L, Varela U C, Bozzo S P, and Altuzarra H R

Subjects
Chile, Education, Medical, Undergraduate standards, Hospitals, Private, Hospitals, Teaching, Humans, Education, Medical, Undergraduate methods, Internal Medicine education
Abstract

There is a 10 years teaching experience for fourth year medical students and interns in a Chilean private hospital. The students attend an eight weeks practical course. The interns rotate during 16 weeks by specialties and make shifts. The hospital structure with Clinical Services and Medical-Surgical departments facilitates the teaching process. There are approximately 30,000 admissions per year with a mean stay of 3.7 days, that allow the students to be in touch with patients with different diseases that are managed with updated technology. We emphasize the ethical and clinical management of concrete problems of patients, learning and communication skills. The students evaluate their stay answering surveys and with semi structured interviews. Teaching is assessed by tutors and heads of departments, in clinical rounds, sometimes prepared by the students, by a thorough revision of problem oriented medical records and with practical and theoretical tests. The results of the program have been quite satisfactory for participants.

Published
2009
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