CONSIDERATIONS ON CONTACTLESS ELECTROMAGNETIC MEASUREMENT OF HUMIDITY IN PEDOLOGY
Journal Title: Fiability & Durability - Year 2017, Vol 19, Issue 1
Abstract
To put into practice the conventional determination of resistivity by the galvanic method, requires a relatively large amount of labor and is, therefore, expensive. At the basis of any interpretation are the lateral or vertical variations of re sistivity. The high cost of resistivity maps execution generally means that fewer measurements are made than desirable, with the result that, either (i) the explored area is not large enough to establish a reasonable background, against which the anomaly areas are to be delineated, or (ii) the anomaly areas are obscure and lack definition. The application of electromagnetic techniques (EM) for measuring soil resistivity or conductivity has been known for a long time. Conductivity is preferable in inductive techniques, as instrumentation readings are generally directly proportional to conductivity and inversely proportional to resistivity. The operating principle of this method is: a Tx coil transmitter, supplied with alternating current at an audio frequency, is placed on the ground. An Rx coil receiver is located at a short distance, s, away from the Tx coil. The magnetic field varies in time and the Tx coil induces very small currents in the ground. These currents generate a secondary magnetic field, Hs, which is sensed by the Rx receiver coil, together with primary magnetic field Hp. The ratio of the secondary field, Hs, to the primary magnetic field, Hp, (Hs/Hp) is directly proportional to terrain conductivity. Measuring this ratio, it is possible to construct a device which measures the terrain conductivity by contactless, direct-reading electromagnetic technique. (linear meter.) This latest technique for measuring conductivity by electromagnetic induction, using Very Low Frequency (VLF), is a non-invasive, non-destructive sampling method. The measurements can be done quickly and are not expensive. The Electromagnetic induction technology was originally developed for the mining industry, and has been used in mineral, oil, and gas exploration, hydrogeology studies, and archaeology. In these applications, differences in conductivity of subsurface layers of rock or soil may indicate stratified layers or voids that could be of interest.
Authors and Affiliations
BURLAN-ROTAR Tudor, Dumitru Gabriel, PRELIPCEANU Alina Ioana
Keywords
Related Articles
- EP ID EP232191
- DOI -
- Views 91
- Downloads 0
FOOD BIOTECHNOLOGY - SUSTAINABLE DEVELOPMENT STRATEGY
Biotechnology is the integral application of biological and engineering sciences for the technological use of living organisms, biologically active acellular structures and molecular analogues for the production of goods...
IMPROVEMENT FOR AN ASSEMBLY FLOW FOR A GIVEN COMPONENT (1)
This study is carried out in a line of assembly of a finite wiring product. The assembly of this finished product is done in two specific sections. For the analysis of the activities in the assembly section, the timing m...
ASPECTS ABOUT BUILDING MODELS IN INNOVATION
Paper presents some aspects regarding the role of the state and its policies to stimulate innovation processes, and models used in innovation.
STUDY TO DETERMINE A NEW MODEL OF THE ISHIKAWA DIAGRAM FOR QUALITY IMPROVEMENT
The paper presents the results of a study concerning the use of the Ishikawa diagram in analyzing the causes that determine the improvement of the quality of education in a university. All the possible, main and secondar...
ON THE QUALITY CONTROL OF THE FUEL FILLER FLAP LINING MARK
The paper provides solutions for the manufacture technological process quality improvement, by implementing a Poka-Yoke device at one of the mold work stations, and by reducing the time required for the manufacturing pro...