dor_id: 4107490

506.#.#.a: Público

590.#.#.d: Los artículos enviados a la Revista Mexicana de Física se someten a un estricto proceso de revisión llevado a cabo por árbitros anónimos, independientes y especializados en todo el mundo.

510.0.#.a: Consejo Nacional de Ciencia y Tecnología (CONACyT), Sistema Regional de Información en Línea para Revistas Científicas de América Latina, el Caribe, España y Portugal (Latindex), Scientific Electronic Library Online (SciELO), SCOPUS, Web Of Science (WoS)

561.#.#.u: http://www.fciencias.unam.mx/

650.#.4.x: Físico Matemáticas y Ciencias de la Tierra

336.#.#.b: info:eu-repo/semantics/article

336.#.#.3: Artículo de Investigación

336.#.#.a: Artículo

351.#.#.6: https://rmf.smf.mx/ojs/rmf/index

351.#.#.b: Revista Mexicana de Física

351.#.#.a: Artículos

harvesting_group: RevistasUNAM

270.1.#.p: Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

590.#.#.c: Open Journal Systems (OJS)

270.#.#.d: MX

270.1.#.d: México

590.#.#.b: Concentrador

883.#.#.u: http://www.revistas.unam.mx/front/

883.#.#.a: Revistas UNAM

590.#.#.a: Coordinación de Difusión Cultural

883.#.#.1: http://www.publicaciones.unam.mx/

883.#.#.q: Dirección General de Publicaciones y Fomento Editorial, UNAM

850.#.#.a: Universidad Nacional Autónoma de México

856.4.0.u: https://rmf.smf.mx/ojs/rmf/article/view/4112/4079

100.1.#.a: Guadarrama Santana, A.; García Valenzuela, A.; Pérez Jiménez, F.; Polo Parada, L.

524.#.#.a: Guadarrama Santana, A., et al. (2014). Interdigitated capacitance sensors in the mm scale with sub-femtoFarad resolution suitable for monitoring processes in liquid films. Revista Mexicana de Física; Vol 60, No 6 Nov-Dec: 451-0. Recuperado de https://repositorio.unam.mx/contenidos/4107490

245.1.0.a: Interdigitated capacitance sensors in the mm scale with sub-femtoFarad resolution suitable for monitoring processes in liquid films

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Facultad de Ciencias, UNAM

264.#.0.c: 2014

264.#.1.c: 2014-01-01

653.#.#.a: Capacitance; interdigitated; electrodes; dielectric; solvent; evaporation

506.1.#.a: La titularidad de los derechos patrimoniales de esta obra pertenece a las instituciones editoras. Su uso se rige por una licencia Creative Commons BY-NC-ND 4.0 Internacional, https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es, fecha de asignación de la licencia 2014-01-01, para un uso diferente consultar al responsable jurídico del repositorio por medio de rmf@ciencias.unam.mx

884.#.#.k: https://rmf.smf.mx/ojs/rmf/article/view/4112

001.#.#.#: oai:ojs.rmf.smf.mx:article/4112

041.#.7.h: eng

520.3.#.a: We propose and analyze a high resolution capacitive sensor appropriate for monitoring physical or chemical processes in liquid films. The proposed sensor is based on a planar interdigitated capacitor with planar electrodes of dimensions in the milimeter scale. The electric field between electrodes extend above the plane of the electrodes up to a few milimeters and thus permits placing a dielectric container with a liquid film on top and still be sensitive to changes in the liquid film. First, we present numerical calculations of the capacitance of an interdigitated sensor as a function of the thickness and dielectric constant of a film placed on top of it using a finite element method. Then, we describe a suitable electronic system to sense with very high-resolution capacitance variations of the sensor by measuring the phase lag and amplitude change of a sinusoidal current signal passing through it. This is accomplished by subtracting a stable sinusoidal current of the same frequency going through a reference device. Initially the system is balanced by adjusting the reference current to cancel out the net output current. In this way, we compensate parasitic capacitances due to electronics, wiring and system hardware as well. When the capacitance of the sensor element varies the system gets unbalanced and a net current appears. The resulting current is measured with a locking-amplifier. To illustrate the sensitivity and resolution achieved by the sensing system, we present results of monitoring the capacitance of the sensor during the evaporation of liquid solvent films and discuss the time-evolution of the registered signals. The floor noise throughout the measurements was in the order of 50 atto-Farads while the signal varied in the range of several femto-Farads.

773.1.#.t: Revista Mexicana de Física; Vol 60, No 6 Nov-Dec (2014): 451-0

773.1.#.o: https://rmf.smf.mx/ojs/rmf/index

046.#.#.j: 2020-11-25 00:00:00.000000

022.#.#.a: 2683-2224 (digital); 0035-001X (impresa)

310.#.#.a: Bimestral

264.#.1.b: Sociedad Mexicana de Física, A.C.

758.#.#.1: https://rmf.smf.mx/ojs/rmf/index

handle: 00de0d64403e59d6

harvesting_date: 2020-09-23 00:00:00.0

856.#.0.q: application/pdf

last_modified: 2020-11-27 00:00:00

license_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es

license_type: by-nc-nd

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