Entity

Time filter

Source Type


Garcia Diego F.-J.,Polytechnic University of Valencia | Esteban B.,Polytechnic University of Valencia | Merello P.,Polytechnic University of Valencia | Merello P.,Instituto Valenciano Of Conservacion Y Restauracion Of Bienes Culturales Ivcr
Sensors (Switzerland) | Year: 2015

Preventive conservation represents a working method and combination of techniques which helps in determining and controlling the deterioration process of cultural heritage in order to take the necessary actions before it occurs. It is acknowledged as important, both in terms of preserving and also reducing the cost of future conservation measures. Therefore, long-term monitoring of physical parameters influencing cultural heritage is necessary. In the context of Smart Cities, monitoring of cultural heritage is of interest in order to perform future comparative studies and load information into the cloud that will be useful for the conservation of other heritage sites. In this paper the development of an economical and appropriate acquisition data system combining wired and wireless communication, as well as third party hardware for increased versatility, is presented. The device allows monitoring a complex network of points with high sampling frequency, with wired sensors in a 1-wire bus and a wireless centralized system recording data for monitoring of physical parameters, as well as the future possibility of attaching an alarm system or sending data over the Internet. This has been possible with the development of three board’s designs and more than 5000 algorithm lines. System tests have shown an adequate system operation. © 2015 by the authors; licensee MDPI, Basel, Switzerland. Source


Garcia-Diego F.-J.,Polytechnic University of Valencia | Fernandez-Navajas A.,Polytechnic University of Valencia | Beltran P.,Polytechnic University of Valencia | Merello P.,Polytechnic University of Valencia | Merello P.,Instituto Valenciano Of Conservacion Y Restauracion Of Bienes Culturales Ivcr
Sensors (Switzerland) | Year: 2013

The mudéjar church of Santa María (Ateca) is valuable for its architecture and the altarpiece contained inside. Ateca is a village with continental climate characterized by cold winters and hot summers. In this paper we are interested in analysing the effect of temperature and relative humidity (RH) changes produced by the heating system on the altarpiece. Therefore, a monitoring system of 15 temperature and 15 relative humidity sensors was installed with a recording frequency of a data point per minute. The main contribution of this paper is the quantitative study of the effect of the heating system on the thermo-hygrometric parameters using statistical techniques such as ANOVA, mean daily trajectories or bivariate plots, and the proposal of an innovative dynamic contour plot. As results, the heating system produces a substantial increase (decrease) of temperature (RH) causing an hourly variation of these physical parameters detrimental to the conservation of the altarpiece, especially in its higher areas. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Garcia-Diego F.-J.,Polytechnic University of Valencia | Sanchez-Quinche A.,Polytechnic University of Valencia | Merello P.,Polytechnic University of Valencia | Merello P.,Instituto Valenciano Of Conservacion Y Restauracion Of Bienes Culturales Ivcr | And 2 more authors.
Sensors (Switzerland) | Year: 2013

In this study we propose an electronic system for linear positioning of a magnet independent of its modulus, which could vary because of aging, different fabrication process, etc. The system comprises a linear array of 24 Hall Effect sensors of proportional response. The data from all sensors are subject to a pretreatment (normalization) by row (position) making them independent on the temporary variation of its magnetic field strength. We analyze the particular case of the individual flow in milking of goats. The multiple regression analysis allowed us to calibrate the electronic system with a percentage of explanation R2 = 99.96%. In our case, the uncertainty in the linear position of the magnet is 0.51 mm that represents 0.019 L of goat milk. The test in farm compared the results obtained by direct reading of the volume with those obtained by the proposed electronic calibrated system, achieving a percentage of explanation of 99.05%. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Fernandez-Navajas A.,Polytechnic University of Valencia | Merello P.,Polytechnic University of Valencia | Merello P.,Instituto Valenciano Of Conservacion Y Restauracion Of Bienes Culturales Ivcr | Beltran P.,Polytechnic University of Valencia | Garcia-Diego F.-J.,Polytechnic University of Valencia
Sensors (Switzerland) | Year: 2013

Preventive conservation requires monitoring and control of the parameters involved in the deterioration process, mainly temperature and relative humidity. It is important to characterise an archaeological site prior to carrying out comparative studies in the future for preventive conservation, either by regular studies to verify whether the conditions are constant, or occasional ones when the boundary conditions are altered. There are numerous covered archaeological sites, but few preventive conservation works that give special attention to the type of cover installed. In particular, there is no background of microclimatic studies in sites that are in the ground and, as in the Plaza de l'Almoina (Valencia, Spain), are buried and partially covered by a transparent roof. A large effect of the transparent cover was found by the sensors located below this area, with substantial increases in temperature and a decrease in the relative humidity during the day. Surrounding zones also have values above the recommended temperature values. On the other hand, the influence of a buried water drainage line near the site is notable, causing an increase in relative humidity levels in the surrounding areas. Multivariate statistical analyses enabled us to characterise the microclimate of the archaeological site, allowing future testing to determine whether the conservation conditions have been altered. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Fernandez-Navajas A.,Polytechnic University of Valencia | Merello P.,Polytechnic University of Valencia | Merello P.,Instituto Valenciano Of Conservacion Y Restauracion Of Bienes Culturales Ivcr | Beltran P.,Polytechnic University of Valencia | Garcia-Diego F.-J.,Polytechnic University of Valencia
Sensors (Switzerland) | Year: 2013

Cultural Heritage preventive conservation requires the monitoring of the parameters involved in the process of deterioration of artworks. Thus, both long-term monitoring of the environmental parameters as well as further analysis of the recorded data are necessary. The long-term monitoring at frequencies higher than 1 data point/day generates large volumes of data that are difficult to store, manage and analyze. This paper presents software which uses a free open source database engine that allows managing and interacting with huge amounts of data from environmental monitoring of cultural heritage sites. It is of simple operation and offers multiple capabilities, such as detection of anomalous data, inquiries, graph plotting and mean trajectories. It is also possible to export the data to a spreadsheet for analyses with more advanced statistical methods (principal component analysis, ANOVA, linear regression, etc.). This paper also deals with a practical application developed for the Renaissance frescoes of the Cathedral of Valencia. The results suggest infiltration of rainwater in the vault and weekly relative humidity changes related with the religious service schedules. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source

Discover hidden collaborations