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Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects

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Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects

dc.contributor.author	Casans Berga, Silvia
dc.contributor.author	García Gil, Rafael
dc.contributor.author	Navarro Antón, A. Edith
dc.contributor.author	Rosado Muñoz, Alfredo
dc.date.accessioned	2020-03-09T14:40:56Z
dc.date.available	2020-03-09T14:40:56Z
dc.date.issued	2019
dc.identifier.citation	Casans Berga, Silvia García Gil, Rafael Navarro Antón, A. Edith Rosado Muñoz, Alfredo 2019 Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects Electronics 8 11 1253
dc.identifier.uri	https://hdl.handle.net/10550/73469
dc.description.abstract	A novel method for measuring the electrical resistance in wood is presented. It is based on applying an Alternating Current (AC) to two electrodes rammed into the wood. The method reduces the transient time for value stabilization. In case of Direct Current (DC) resistance measurement methods, typically used in wood measurement, an initial transient exists, invalidating the measured value during an initial transient period. This measurement method uses an electronic circuit based on a relaxation oscillator where the wood automatically sets the oscillation frequency depending on its electrical resistance. Compared to other AC methods, this circuit greatly simplifies the measurement process, not requiring any previous analysis for wood AC frequency estimation. Experimental results for four different wood species showed that, in all cases, the transient response of the measured wood resistance is improved when compared to the DC resistance method, reducing the stabilization time from 10-12 min in DC measurements to almost zero for the novel measurement method. The deviation between the initial wood resistance measurement and the stable value resulted in a range between 0.2% and 5% with the proposed method, while a range between 6% and 10% was obtained when using the DC method. Moreover, the proposed circuit is able to detect changes in wood resistance produced by small variations in temperature and environmental relative humidity during continuous long term measurements. For repeatability analysis, it was verified that similar ambient conditions of temperature and relative humidity (variations lower than 1 °C and 1%, respectively) in different moments provided variations lower than 1.5%. The method can also be applied to other fiber materials affectd by polarization effects when an electrical current is applied into them.
dc.language.iso	eng
dc.relation.ispartof	Electronics, 2019, vol. 8, num. 11, p. 1253
dc.subject	Circuits electrònics
dc.subject	Enginyeria elèctrica
dc.title	Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects
dc.type	journal article	es_ES
dc.date.updated	2020-03-09T14:40:56Z
dc.identifier.doi	10.3390/electronics8111253
dc.identifier.idgrec	136672
dc.rights.accessRights	open access	es_ES