Dr. Mary Carmen Peña-Gomar Profile

Dr. Mary Carmen Peña-Gomar

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Publications (12)

Proceedings Article | 24 October 2012 Paper

Analysis of bacterial growth by UV/Vis spectroscopy and laser reflectometry

Mary Carmen Peña-Gomar, Gonzalo Viramontes-Gamboa, Grethel Peña-Gomar, Mauricio Ortiz Gutiérrez, Mariano Hernández Ramírez

Proceedings Volume 8412, 84120H (2012) https://doi.org/10.1117/12.2001482

KEYWORDS: Nanoparticles, Silver, Bacteria, Reflectometry, Absorbance, Laser spectroscopy, Spectroscopy, Reflectance spectroscopy, Reflectivity, Sodium

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Proceedings Article | 24 October 2012 Paper

Optrodes of photonic fiber to pH sensor

A. Rendón-Romero, M. Peña-Gomar, E. Alvarado-Méndez

Proceedings Volume 8412, 84120I (2012) https://doi.org/10.1117/12.2001485

KEYWORDS: Optical fibers, Sol-gels, Photonic crystal fibers, Liquids, Sensors, Solids, Dispersion, Transmittance, Structured optical fibers, Atmospheric particles

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Proceedings Article | 8 September 2010 Paper

Laser reflectometry near the critical angle for the analysis of chemical reactions

Tania Oyuki Chang-Martínez, Mary Carmen Peña-Gomar, Gonzalo Viramontes-Gamboa

Proceedings Volume 7799, 77990R (2010) https://doi.org/10.1117/12.862998

KEYWORDS: Reflectivity, Copper, Chemical reactions, Reflectometry, Refractive index, Chemical analysis, Ions, Water, Interfaces, Iron

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Proceedings Article | 5 August 2009 Paper

On the characterization of a random monolayer of particles from coherent optical reflectance

F. Alarcón-Oseguera, M. Peña-Gomar, A. García-Valenzuela, F. Castillo, E. Pérez

Proceedings Volume 7386, 738612 (2009) https://doi.org/10.1117/12.839606

KEYWORDS: Particles, Reflectivity, Light scattering, Scattering, Reflection, Data modeling, Refractive index, Glasses, Adsorption, Laser scattering

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Proceedings Article | 18 February 2004 Paper

Monitoring particle adsorption and thin film formation by laser reflectometry near the critical angle

Mary Carmen Pena-Gomar, Elias Perez, Augusto García-Valenzuela, Joan Anto i Roca

Proceedings Volume 5249, (2004) https://doi.org/10.1117/12.513508

KEYWORDS: Particles, Adsorption, Reflectivity, Reflection, Reflectometry, Water, Latex, Refraction, Glasses, Mirrors

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SPIE Journal Paper | 1 April 2003

Sensitivity analysis of angle-sensitive detectors based on a film resonator

Augusto Garcia-Valenzuela, Mary Pena-Gomar, Joel Villatoro

OE, Vol. 42, Issue 04, (April 2003) https://doi.org/10.1117/12.10.1117/1.1554406

KEYWORDS: Resonators, Sensors, Polarization, Diffraction, Prisms, Interfaces, Reflection, Beam splitters, Reflectivity, Signal detection

SPIE Journal Paper | 1 March 2003

Design of an optical probe based on angle scanning reflectometry near the critical angle

Mary Carmen Pena-Gomar, Augusto García-Valenzuela, Martha Rosete-Aguilar

OE, Vol. 42, Issue 03, (March 2003) https://doi.org/10.1117/12.10.1117/1.1542593

KEYWORDS: Reflectivity, Refractive index, Mirrors, Optical design, Prototyping, Modulators, Reflectometry, Sensors, Absorption, Water

Proceedings Article | 17 February 2003 Paper

Portable refractometer incorporating dynamic reflectometry for monitoring the complex index of refraction in nontransparent liquids

M. Pena-Gomar, G Pena-Gomar, Augusto Garcia-Valenzuela

Proceedings Volume 4833, (2003) https://doi.org/10.1117/12.473982

KEYWORDS: Reflectivity, Liquids, Mirrors, Reflectometry, Sensors, Refractive index, Water, Refraction, Prototyping, Particles

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In this work we present the development of an optical probe which can be used to measure the absolute value of the real and imaginary parts of the refractive index of transparent, opaque or turbid liquids indistinctly. The device can work as a portable, immersion-type, critical-angle refractometer or as a high resolution optical sensor to monitor physical or chemical processes in liquids. The instrument is based on scanning laser reflectometry and measures the reflectance angular-profile around the critical angle. It also measures directly the angle-differential profile of the reflectivity by dynamic reflectometry. For sensing variations of the RI, one can monitor in time either the reflectance or its angular derivative in the vicinity of the critical angle. The uncertainty of the instrument in measuring the real part of the RI can be 10^-6. The sensing resolution can be 10^-7 when monitoring the differential reflectivity. When the RI is harmonically modulated in time (of RI), it is possible to achieve a resolution as high as 10^-10. The applicability of the technique to turbid media consisting in suspension of particles is briefly discussed. We also show that the RI of liquid sample can be monitored through a physical or chemical process if the liquid is vigorously stirred. Regarding the instrument design, we use a novel mechanism to control the angle of incidence which allows to keep all components fixed (laser, detector, semi-cylindrical lens, angle modulator, and cables), except for a mirror and a collimating lens. It only requires linear displacements, for which a conventional micrometer is enough. This design is a considerable improvement over the typical laboratory arrangement used by several authors, and permits to have a portable, compact instrument with all the capabilities of the laboratory technique. The design offers a wide measurement range as to cover most water solutions. We believe the device offers an acceptable balance between size and stability. We give results obtained with an experimental prototype of the device. The aim of this work is a general overview of the foundations of the technique, the development of the sensor and some applications.

SPIE Journal Paper | 1 August 2002

Error analysis on measuring angle-differential profiles of optical reflectivity by dynamic reflectometry

Augusto Garcia-Valenzuela, M. Pena-Gomar

OE, Vol. 41, Issue 08, (August 2002) https://doi.org/10.1117/12.10.1117/1.1489052

KEYWORDS: Reflectivity, Sensors, Modulation, Error analysis, Charge-coupled devices, Signal detection, Reflectometry, Diodes, Modulators, Interfaces

SPIE Journal Paper | 1 July 2002

Measuring and sensing a complex refractive index by laser reflection near the critical angle

Augusto Garcia-Valenzuela, M. Pena-Gomar, C. Fajardo-Lira

OE, Vol. 41, Issue 07, (July 2002) https://doi.org/10.1117/12.10.1117/1.1483084

KEYWORDS: Reflectivity, Particles, Liquids, Modulation, Absorption, Refractive index, Glasses, Optical engineering, Sensors, Reflectometry

Proceedings Article | 29 December 2000 Paper

Optical device for sensing the index of refraction of liquids with high turbidity

M. Pena-Gomar, C. Fajardo-Lira, Martha Rosete-Aguilar, Augusto Garcia-Valenzuela

Proceedings Volume 4203, (2000) https://doi.org/10.1117/12.411747

KEYWORDS: Reflectivity, Liquids, Particles, Gaussian beams, Absorption, Optical components, Refractive index, Mirrors, Refraction, Scattering

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Proceedings Article | 2 September 1999 Paper

Optical sensing of absorbing and inhomogeneous media by AC-reflection near the critical angle

Augusto Garcia-Valenzuela, M. Pena-Gomar

Proceedings Volume 3878, (1999) https://doi.org/10.1117/12.361263

KEYWORDS: Reflectivity, Refractive index, Modulation, Refraction, Prisms, Sensors, Absorption, Collimation, Microopto electromechanical systems, Interfaces

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Showing 5 of 12 publications

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