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Zasnova merilnika deževnih kapljic
RUPAR, LUKA (Author), Trontelj, Janez (Mentor) More about this mentor... This link opens in a new window

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Abstract
V magistrski nalogi je predstavljen sistem za merjenje velikosti in števila vodnih kapljic preko spremembe kapacitivnosti ploščnega kondenzatorja. Dva zaporedno vezana kondenzatorja tvorita napetostni delilnik, pri čemer je prvi kondenzator izpostavljen kapljicam vode, drugi pa služi kot referenca. Ko med plošči kondenzatorja pade kapljica vode, ta spremeni dielektričnost kondenzatorja. Dielektričnost vode je precej višja od dielektričnosti zraka, kapacitivnost se poveča in temu ustrezno se spremeni razmerje napetostnega delilnika. Izmerjena napetost je sorazmerna z velikostjo vodnih kapljic, ki so bile karakterizirane s številnimi meritvami. S seštevanjem volumna vodnih kapljic znotraj določenega časovnega obdobja lahko izračunamo pretok vode. V uvodnih poglavjih magistrske naloge so predstavljene karakteristike padavin, skupaj s kratko zgodovino razvoja merilnikov padavin, ter pregledom obstoječih rešitev. V nadaljevanju sledi razlaga teoretičnega ozadja delovanja zasnovanega merilnega sistema, opis postopka razvoja analognega vezja, ter razlaga delovanja posameznih sklopov sistema. Sledi tudi opis delov programa, ki vključuje algoritme za zaznavo ter obdelavo vodnih kapljic. Na zadnje sledi še opis poteka meritev ter analiza dobljenih rezultatov.

Language:Slovenian
Keywords:merilnik padavin, kondenzatorski napetostni delilnik, analogno vezje
Work type:Master's thesis/paper (mb22)
Organization:FE - Faculty of Electrical Engineering
Year:2021
Views:54
Downloads:35
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Secondary language

Language:English
Title:Rain Droplets Measuring System Design
Abstract:
A detection system for measuring the size and number of water drops via the change of capacitance of a parallel plate capacitor is presented in this thesis. A voltage divider is formed with two capacitors connected in series, where one of the capacitors is being exposed to water drops and the other one is used as a reference. When a drop of water falls between the plates of the capacitor, the total permittivity of the capacitor changes. The permittivity of water is much higher than the permittivity of air, so the rise in capacitance changes the voltage divider ratio. The obtained voltage is proportional to the size of the water drops which were characterized with numerous measurements. The volume of water drops can be summed in a specific time frame and therefore the water flow can be calculated. The introductory chapters of the thesis present the characteristics of precipitation, together with a brief history of development, and an overview of existing precipitation measuring devices. The following is an explanation of the theoretical background of the operation of the designed measuring system, a description of the process of developing an analog circuit and an explanation of the operation of individual parts of the system. Then we have a description of the parts of the program that include detection algorithms and water droplet processing. Finally, a description of measurements and analysis of the obtained results follows.

Keywords:rain gauge, capacitor voltage divider, analog circuit

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