Digitalna sonda za ispitivanje cijevi vrtložnim strujama

master's thesis

• Title (english): Digital Eddy Current Probe for Tubing Inspection
• Author: Robert Tutić
• Mentor: Darko Vasić (mentor)
• Committee member: Darko Vasić (predsjednik povjerenstva)
• Committee member: Vedran Bilas (član povjerenstva)
• Committee member: Dinko Oletić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2018-07-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Testiranje vrtložnim strujama je nerazorna metoda ispitivanja električki vodljivih objekata. Razvijena je digitalna sonda za testiranje vrtložnim strujama temeljena na ARM Cortex-M4 arhitekturi. Sonda je namijenjena ispitivanju svojstava i oštećenja cijevi, s posebnom pažnjom obraćenom na minijaturizaciju sonde radi mogućnosti umetanja u samu cijev. Za pobudu zavojnice koristi se pravokutni upravljački signal s definiranim spektralnim komponentama. Sonda se sastoji od digitalnog i analognog podsustava i pobudne zavojnice, a prema upravljačkom računalu potrebne su veze za serijsku komunikaciju i bipolarno napajanje. Sustav je testiran u rasponu od 4 do 50 kHz u kojem omogućuje praćenje impedancije zavojnice. Prikazane su linearne krivulje umjeravanja potrebne za povećanje točnosti mjerenja.

Abstract (english)

Eddy current testing is a non-destructive testing method used on electrically conductive materials. A digital eddy current probe has been developed based on ARM Cortex-M4 architecture. The probe's intented use is determining the qualities and defects of a tube, with special attention being given to miniaturization of the probe itself, so it could be placed inside the tube. The excitation signal is a square wave with defined spectral components. The probe consists of a digital and analog subsystem and a single coil, with external connections required for serial communication with the host PC and bipolar power supply. The system has been tested and found functional in determining the coil impedance in the 4 to 50 kHz range. Linear calibration curves have been found which are required for higher measurement accuracies.

• Keywords: testiranje vrtložnim strujama; pulsno testiranje vrtložnim strujama; digitalna sonda; pravokutna pobuda; definirane spektralne komponente; H-most; STM32; Cortex-M4
• Keywords (english): eddy current testing; pulsed eddy current testing; digital probe; square excitation signal; defined spectral components; H-bridge; STM32; Cortex-M4
• Language: croatian
• URN:NBN: urn:nbn:hr:168:189260
• 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: 2019-03-14 01:45:05