EP2387015A1 - Système pour surveiller à distance la teneur en humidité d'éléments de bois - Google Patents

Système pour surveiller à distance la teneur en humidité d'éléments de bois Download PDF

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Publication number
EP2387015A1
EP2387015A1 EP10382108A EP10382108A EP2387015A1 EP 2387015 A1 EP2387015 A1 EP 2387015A1 EP 10382108 A EP10382108 A EP 10382108A EP 10382108 A EP10382108 A EP 10382108A EP 2387015 A1 EP2387015 A1 EP 2387015A1
Authority
EP
European Patent Office
Prior art keywords
moisture
wood
cards
conductive
previous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10382108A
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German (de)
English (en)
Inventor
Ivan Araquistain Marquina
Oriol Munne Caballero
José Miguel Abascal Muro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fundacion Tecnalia Research and Innovation
Original Assignee
Fundacion Cidemco
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fundacion Cidemco filed Critical Fundacion Cidemco
Priority to EP10382108A priority Critical patent/EP2387015A1/fr
Publication of EP2387015A1 publication Critical patent/EP2387015A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/20—Status alarms responsive to moisture

Definitions

  • the field of application of the present invention is in the industrial sector dedicated to the assembly of electronic instrumentation and to the programming of electronic devices for detecting failures in the construction sector, as well as in the maintenance and rehabilitation of constructions.
  • Wireless mesh networks, coupled networks, or infrastructure wireless mesh networks are basically networks with an infrastructure topology but they allow devices, which, despite being outside the coverage range of the access points, are inside the coverage range of a network card which is directly or indirectly inside the coverage range of an access point, to be joined to the network
  • Patent application WO2009/018650 describes a method for monitoring moisture in a building, which indicates the need to control moisture to prevent fungi in the wood. It has an alarm based on a moisture threshold and allows a risk assessment of potential damage using the values of the moisture detectors. It uses a calculation of the risk assessment to identify the critical exposure to the moisture, warning the maintenance personnel. It supports mesh networking.
  • Patent application US2006/092031 discloses equipment for monitoring the surveillance of the presence of areas of moisture in buildings, among other wood structures.
  • the system uses multiple moisture detectors, each installed in a location of the structure.
  • a remote sensor unit is associated with each area to be supervised and is joined to the detectors in the associated area.
  • the system is programmed so that the sensors and detectors (which comprise a pair of electric conductors in a dielectric substrate) send the reading of what they are supervising every certain time to a supervision unit.
  • the described invention relates to a system for remotely monitoring moisture in a wood element which solves the aforementioned problems of predicting the future behavior of wood elements, such that the preservation thereof with suitable treatments can be assured before the dimensional changes of wood and its serious associated damage thereof result in high repair costs due to not having been able to foresee its behavior.
  • the invention relates to a system for remotely monitoring moisture in a wood element which comprises a plurality of electric current-conducting terminals (for example a nail or a screw) connectable to a wood element, at measurement points, by means of at least one connector (3) installable in a wood element, which in turn comprises a card (1) comprising a microcontroller, the moisture measurement electronics and a wireless communications module in communication with a computer.
  • a plurality of electric current-conducting terminals for example a nail or a screw
  • a connector (3) installable in a wood element, which in turn comprises a card (1) comprising a microcontroller, the moisture measurement electronics and a wireless communications module in communication with a computer.
  • the card furthermore comprises a temperature sensor and another relative air humidity sensor which provide the necessary measurements for obtaining, as a result of previously calculated values, the equilibrium moisture of the wood. This equilibrium moisture is compared with the reading of the moisture of the wood and the moisture tendency value is thus obtained.
  • This table represents in its x-axis the ambient temperature in degrees centigrade and in its y-axis the moisture in percentage.
  • the moisture percentage at which wood reaches equilibrium is found in the intersection between the relative air humidity and the ambient temperature If the moisture measured in wood is less than the equilibrium moisture, the moisture tendency value is increasing. However, if the moisture measured in wood is greater than the equilibrium moisture the tendency is decreasing.
  • the cards are clustered together forming nodes. These cards are therefore in a hibernation state, i.e., there is no activity as long as they do not receive a request for reading the moisture content by a computer (4) acting as a coordinator of these nodes.
  • the communication with said computer is carried out by means of the wireless communications module of the cards.
  • the moisture measurement in wood is based on measuring the electrical conductivity of wood. This means that the electrical conductivity of wood varies very considerably depending on its moisture content.
  • the system follows the formula described above to calculate the moisture content of wood in a generic manner. However, the calculation formula is adjusted by software to calibrate the measurement for different wood species and different ambient temperatures.
  • the system can be configured by software to measure in two moisture ranges. In the low moisture range, moisture is measured between 7% and 15%, whereas in the high range it is measured between 16% and 30%.
  • the cards have a potentiometer for adjusting the signal amplification level for each point to be measured.
  • This potentiometer allows the system to adjust the moisture measurement range at hardware level for different wood species.
  • the connectors and the cards are joined by means of an FPC type flexible plastic conductive tape (2) ( Figure 1 ).
  • the tape is formed by n wires, i.e., one wire for each connector.
  • the tape also has boreholes with a conductive rim in which the conductive elements are introduced.
  • the wireless communications module of the cards and the radio frequency interface work in the 868 or 869 Megahertz band
  • a final aspect of the invention is a webpage which has among its functionalities the representation of a history of measurements which is saved in a server enabled to that effect and the representation of the moisture tendency value.
  • a wireless communications module Card [1... n]
  • Each of them can measure the moisture at 10 independent points through the system of FPC type plastic conductive tape (2) ( Figure 1 ) with n wires. Said tape, in addition to allowing the measurement at several points (not necessarily in a straight line, since it is manufactured from flexible plastic and enables drawing curves between the measurement points)).
  • the connectors (3), depicted in Figure 2 comprise boreholes (5), depicted in Figure 1 , with a conductive rim through which the conductive elements are introduced, which conductive elements are arranged in a semicircular manner and in a manner equidistant to a conductive element (6) common for all the measurement points, which can be a nail or a screw of a material having low resistance to the passage of electricity and which, inserted in the wood, allow measuring the moisture content at that point at the depth at which they have been introduced.
  • the boreholes are arranged in two vertical parallel lines separated by the distance which must exist between the conductive elements.
  • each node formed by [1..n] cards a temperature and relative air humidity sensor is installed in at least one card.
  • a system for predicting the equilibrium moisture of wood which is dependent on the three parameters read moisture of the wood, relative air humidity and ambient temperature
  • Wood is a hygroscopic material, therefore it balances its moisture content depending on the ambient temperature and moisture. The calculation process for estimating the tendency value of wood in terms of its equilibrium moisture is described below
  • This table represents in its x-axis the ambient temperature in degrees centigrade and in its y-axis the moisture in percentage.
  • the moisture percentage at which wood reaches equilibrium is found in the intersection between the relative air humidity and the ambient temperature. If the moisture measured in wood is less than the equilibrium moisture, the moisture tendency value is increasing. However, if the moisture measured in wood is greater than the equilibrium moisture the tendency is decreasing.
  • the software performs an approximation to the closest value.
  • the cards have a potentiometer for adjusting the signal amplification level for each point to be measured.
  • each card has 10 potentiometers for an independent adjustment of each point. They are connected to a common information processing module (microcontroller) and a wireless communications module.
  • the computer Acting as a concentrator of all these nodes there is the computer (4) as a central unit, which acts as a controller of all the nodes formed by the cards (Cards[1...n]), to which it is connected by means of a wireless link to monitor the state of each of them, offering at the same time various modes of interaction with the user.
  • the interaction can be performed remotely, by means of an integrated web interface and different user access interfaces, for example, based on GSM, GPRS, Ethernet..., as a result of which it can access the monitoring by means of different user terminals: mobile telephones, PDAs, PCs or laptops connected to Internet, such that the applications are completely programmable and configurable by the user.
  • the computer includes a wireless communications module operating in the 868 MHz ISM band, which is tunable and programmable, through which it receives the radio messages with the moisture, temperature and relative humidity data obtained by the conductive and sensor elements, and notifies them to the web server by means of series communication.
  • the wireless communications modules have an indoor range of 200 meters and an outdoor range of 1 Km and are configured according to a mesh topology.
  • the previous platform has the necessary access interfaces for being connected, on one hand, with the wireless terminals located in the building under supervision and, on the other hand, with the terminal of the supervisor, which may or may not be wireless also.
  • the computer acts in a dual role as concentrator of the controlled sensor devices and allowing the complete interaction of the end user with all the controlled devices, adapting to the topology of the specific operations scenario.
  • the power supply is provided with a 9V battery which, together with the necessary software allowing the device to remain on standby for the time in which it is not performing any task and increases the lifetime of the device, reducing at the same time the costs and the size of the described modules.
  • the moisture measurement in wood is based on measuring the electrical conductivity of wood. This means that the electrical conductivity of wood varies quite considerably depending on its moisture content.
  • the system follows the formula described above to calculate the moisture content of wood in a generic manner. However, the calculation formula is adjusted by software to calibrate the measurement for different wood species and different ambient temperatures.
  • the system can furthermore be configured by software to measure in two moisture ranges.
  • moisture is measured between 7% and 15%, whereas in the high range it is measured between 16% and 30%.
  • the main application of the low moisture range is the monitoring of wood flooring, whereas the main application of the high moisture range is the monitoring of wood structures.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
EP10382108A 2010-05-05 2010-05-05 Système pour surveiller à distance la teneur en humidité d'éléments de bois Withdrawn EP2387015A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10382108A EP2387015A1 (fr) 2010-05-05 2010-05-05 Système pour surveiller à distance la teneur en humidité d'éléments de bois

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10382108A EP2387015A1 (fr) 2010-05-05 2010-05-05 Système pour surveiller à distance la teneur en humidité d'éléments de bois

Publications (1)

Publication Number Publication Date
EP2387015A1 true EP2387015A1 (fr) 2011-11-16

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EP10382108A Withdrawn EP2387015A1 (fr) 2010-05-05 2010-05-05 Système pour surveiller à distance la teneur en humidité d'éléments de bois

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EP (1) EP2387015A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015076690A1 (fr) * 2013-11-21 2015-05-28 Siemens Aktiengesellschaft Procédé et appareil pour la surveillance de condition distribuée sur une combinaison de techniques
CN110832887A (zh) * 2018-11-30 2020-02-21 深圳市大疆创新科技有限公司 内部通信链路系统和无人飞行器
IT202100004919A1 (it) * 2021-03-03 2022-09-03 Woodcontrol S R L Metodo e sistema per il monitoraggio di strutture in legno

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010837A2 (fr) 2003-07-18 2005-02-03 Detec Systems Llc Capteurs de detection d'humidite pour structures de batiments
US20060092031A1 (en) 2004-11-02 2006-05-04 Vokey David E Building monitoring system
US7142123B1 (en) * 2005-09-23 2006-11-28 Lawrence Kates Method and apparatus for detecting moisture in building materials
UA27458U (en) 2007-07-27 2007-10-25 Moisture meter for wood
WO2008082681A1 (fr) 2006-12-29 2008-07-10 Signature Control Systems, Inc. Procédés de mesure et d'étalonnage améliorés pour la mesure de l'humidité d'un séchoir à bois
WO2009018650A1 (fr) 2007-08-03 2009-02-12 Detec Systems Llc Système de surveillance d'humidité pour bâtiments
JP2010054422A (ja) * 2008-08-29 2010-03-11 S X L Corp 木質系建物の劣化診断システム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010837A2 (fr) 2003-07-18 2005-02-03 Detec Systems Llc Capteurs de detection d'humidite pour structures de batiments
US20060092031A1 (en) 2004-11-02 2006-05-04 Vokey David E Building monitoring system
US7142123B1 (en) * 2005-09-23 2006-11-28 Lawrence Kates Method and apparatus for detecting moisture in building materials
WO2008082681A1 (fr) 2006-12-29 2008-07-10 Signature Control Systems, Inc. Procédés de mesure et d'étalonnage améliorés pour la mesure de l'humidité d'un séchoir à bois
UA27458U (en) 2007-07-27 2007-10-25 Moisture meter for wood
WO2009018650A1 (fr) 2007-08-03 2009-02-12 Detec Systems Llc Système de surveillance d'humidité pour bâtiments
JP2010054422A (ja) * 2008-08-29 2010-03-11 S X L Corp 木質系建物の劣化診断システム

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015076690A1 (fr) * 2013-11-21 2015-05-28 Siemens Aktiengesellschaft Procédé et appareil pour la surveillance de condition distribuée sur une combinaison de techniques
CN110832887A (zh) * 2018-11-30 2020-02-21 深圳市大疆创新科技有限公司 内部通信链路系统和无人飞行器
IT202100004919A1 (it) * 2021-03-03 2022-09-03 Woodcontrol S R L Metodo e sistema per il monitoraggio di strutture in legno

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