Implementacija sustava za mjerenje respiracije na temelju promjene volumena prsnog koša

undergraduate thesis

• Title (english): Respiratory System Implementation Based on Thorax Volume Changes
• Author: Martin Cvitić
• Mentor: Željka Lučev Vasić (mentor)
• Committee member: Željka Lučev Vasić (predsjednik povjerenstva)
• Committee member: Ivana Čuljak (član povjerenstva)
• Committee member: Krešimir Friganović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2019-09-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Disanje je jedna od najbitnijih funkcija za normalan rad organizma i zbog toga je bitno raspoznavati faze i uobičajene veličine nekih parametara disanja kako bi se pravovremeno moglo reagirati na moguće nepravilnosti. U ovom Završnom radu opisan je sustav kojim se neinvazivnom metodom prati disanje uz pomoć vodljive trake koja se stavlja oko prsnog koša. Disanjem se mijenja volumen prsnog koša, duljina vodljive trake, a samim time i njen otpor. Vodljiva traka je spojena kao dio Wheatstoneovog mosnog spoja na pločici. Disanje unosi neravnotežu u most kojeg napaja izvor istosmjernog napona. Pošto je dobiveni signal reda veličine milivolti, on se pojačava uz pomoć instrumentacijskog pojačala kako bi bio pogodan na daljnju obradu na računalu. Na izlazu sustava se nalazi niskopropusni filtar koji guši sve signale frekvencija viših od frekvencije disanja. Analogni podaci se uz pomoć akvizicijske kartice NI USB-6211 pretvaraju u digitalne koji se obrađuju i grafički prikazuju u MATLAB-u.

Abstract (english)

Respiration plays a vital role in life of an organism and it is important to know how to describe parameters of breathing in order to prevent potentially abnormal conditions of human subject. In this bachelor thesis, a non-invasive system for tracking respiratory changes using a conductive rubber wrapped around the thorax is described. Breathing changes volume of the thorax, length of the conductive rubber, as well as its resistance. The conductive rubber is connected as a resistor in a Wheatstone bridge on a printed circuit board. Breathing causes imbalance on the Wheatstone bridge which is supplied from a DC voltage source. Since the signal is in the order of millivolts, it must be amplified with instrumentational amplifier so that it can be suitable for data acquisition on a computer. After the amplifier, there is also a low-pass filter which attenuates signal components with a frequency higher than the frequency specific for rapid breathing. Analog data is digitized by a NI USB-6211 data acquisition system, and later processed and plotted in MATLAB.

• Keywords: disanje; vodljiva traka; akvizicija podataka
• Keywords (english): Respiration; conductive rubber; data acquisition
• Language: croatian
• URN:NBN: urn:nbn:hr:168:555056
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-01-07 17:17:20