MENU

A system of monitoring of selected parameters of porous substances using the eis method in a wide range of applications

Development and realization of monitoring system based on the method of electrical impedance spectrometry for monitoring selected parameters of porous substances for application in conditions of real environment, agriculture and of food industry is solved in project.

Water is either the natural part of porous substances (organic and inorganic), or it penetrates them, often by complicated processes. The substances which are the subject of investigation in the given project constitute a complex three-component environment, in which the solid component is represented not only by organic particles, soil, earth, weathered rock, bedrock, but also by water in solid state (snow, ice), the liquid component is usually represented by water and aqueous solutions and also by other water-immiscible fluids (e.g. petroleum, mineral oil) and the gaseous component is represented by air, aerosols and the other gases. In relation to flow and transport of substances, the given porous environment is made up of a complicated system of solid particles of different geometric and physical-chemical properties, and pores. The geometry of pores is very difficult to describe; some pores are interconnected, others not. Due to the interconnection of pores, the permeability of the system is ensured for liquid components (gases, fluids) which fully fill it, but in a different ratio. According to the volume of the liquid component present in pores, the degree of saturation is defined. Based on the degree of saturation, it is possible to characterize the porous substance or environment as dry, damp, moist, very moist, or saturated, e.g., by water. The content of water (moisture) in porous substances or in an environment belongs to the fundamental parameters characterizing the properties of organic and inorganic substances and is one of the characteristic variables which significantly influences a number of other physical parameters, e.g. permittivity and resistivity. The dynamics of changes in the content of water, and hence moisture as well, can be determined using various methods and procedures. They also include the indirect measuring method of electrical impedance spectrometry (EIS), which began to be applied more significantly since the end of the last century. The subject of the solution of the project is the construction of a set of instruments of a multi-channel automated system for monitoring electrical impedance of porous substances and its changes due to changes in water content. The developed system enables the measurement of both the real electrical resistance or electrical conductance of substances, and also some of their properties (the imaginary part of electrical impedance). It becomes evident that the areas of application are wide. In the area of water management, the system is designed for monitoring changes in soil moisture (electrical conductance) due to the suction capability of soil (bank suction, induced suction, suction from precipitation) and water infiltration. The content of water in soils (moisture) is significantly involved in their shear strength, and therefore has a great significance in geotechnical practice. In addition to the processes that take place in soils, the project is focused on the use of the system in agriculture in optimization of irrigation and in the food industry, e.g. in monitoring meat ageing. Another application can be assumed in the building industry in monitoring the moisture of masonry at different depths (treatment of constructions after flooding), in documenting the process of drying of masonry of historical buildings, in monitoring changes in the moisture of wooden building elements, or in hydrology, e.g. in monitoring the height and structure of snow cover. The individual partners of the project are concerned with a wide range of problems within their professional specialization in relation to the overall concept of the project. The goal of the submitted project is to develop and construct a modular measuring system for selected applications and specific requirements of measurement in the real environment, to modify the offer of the system consisting of a measuring device (Z-meter), probes with a definable total length and with a possible option of the number of measuring sensors, each of them having its determined position, to enable the battery source of electric power of the system to be recharged from a solar panel in the case that the system is permanently mounted at a monitored site, to minimize the energy consumption of the system while enabling continuous or long-lasting discrete measurement. The project also sets a goal to process output data in such a manner which would become usable also for those subjects and persons who do not have sufficient expert knowledge, yet they are able to understand and make use of sensed key data in their work and within the use of the measuring system. One of the most important properties of the concept is the capability of data processing online and informing the user about the situation on the basis of the achievement of pre-defined measured values so that it is possible, if necessary, to respond immediately to a situation that has occurred and to act.
Acronym: 
APPL-EIS
Project ID: 
7 614
Start date: 
01-11-2012
Project Duration: 
50months
Project costs: 
1 660 000.00€
Technological Area: 
Sensors/Multisensor Technology, Instrumentation
Market Area: 
Industrial Equipment and Machinery

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.