Prijenosni sustav za električnu kapacitivnu tomografiju

master's thesis

• Title (english): Portable electrical capacitance tomography system
• Author: Ivan Lasić
• Mentor: Hrvoje Džapo (mentor)
• Committee member: Hrvoje Džapo (predsjednik povjerenstva)
• Committee member: Mile Šikić (član povjerenstva)
• Committee member: Darko Vasić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2016-07-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom diplomskom radu razmotrene su različite metode mjerenja kapaciteta, s posebnim osvrtom na metode s primjenom u električnoj kapacitivnoj tomografiji. Razvijen je sklopovski prototip višekanalnog sustava za električnu kapacitivnu tomografiju. Sustav se sastoji od generatora sinusnog signala promjenjive frekvencije realiziranog DDS sklopom, analogne sklopke za prespajanje do 12 vanjskih elektroda, izlaznog pojačala za pobudu elektroda, ulaznog pojačala za mjerenje odziva na odabranim elektrodama, antialiasing filtra, sklopovlja za pretvorbu bipolarnog signala u unipolarni te A/D pretvornika. Sustavom upravlja STM32F07VG mikrokontroler, koji omogućuje osnovne operacije nad uzorcima i njihovo slanje na osobno računalo u Matlab okruženje, gdje su implementirani algoritmi digitalne obradbe signala.

Abstract (english)

In this thesis methods for capacitance measurement were elaborated,with particular emphasis on methods for electrical capacitance tomography applications. Hardware prototype for multichannel electrical capacitance tomography measurements was developed. The system consists of sine wave generator realized by using DDS, analogue switch for up to 12 external electrodes, output amplifier for electrodes excitation, input amplifier for sensing voltage on electrodes, antialiasing filter, bipolar to unipolar signal converter and A/D converter.The system is controlled by STM32F407VG microcontroller, which enables basic operations on samples and their transfer to a personal computer in Matlab environment, were digital signal processing algorithms were implemented.

• Keywords: kapacitivni senzor; električna kapacitivna tomografija; fazno osjetljiva detekcija; impedancijska spektroskopija; STM32F4
• Keywords (english): capacitance sensor; electrical capacitance tomography; Lock-In; phase sensitive detection; phase sensitive detection; impedance spectroscopy; STM32F4
• Language: croatian
• URN:NBN: urn:nbn:hr:168:868065
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 10:06:00