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Ultraljudsmätare för bubbelfälla

Lovén, Martin (2008)
Computer Science and Engineering (BSc)
Abstract
This bachelor thesis is about an ultrasonic sensor, implemented in a bubble chamber in Artis. The sensor consists of the piezoelectric sensor and an electronic control circuit. The control circuit consists of a programmable microprocessor, PIC18F2420 and a circuit, which sends the excitation signal to the piezoelectric sensor, and later receives the echo. This bachelor thesis consists also of a theoretical study, which examines different techniques of liquid level sensing in a chamber. The study discusses which factors are important in liquid level sensing and examine accepted methods. Based on that knowledge the bachelor thesis examines some newer techniques as well. The practical part of the work starts with an electrical signal that... (More)
This bachelor thesis is about an ultrasonic sensor, implemented in a bubble chamber in Artis. The sensor consists of the piezoelectric sensor and an electronic control circuit. The control circuit consists of a programmable microprocessor, PIC18F2420 and a circuit, which sends the excitation signal to the piezoelectric sensor, and later receives the echo. This bachelor thesis consists also of a theoretical study, which examines different techniques of liquid level sensing in a chamber. The study discusses which factors are important in liquid level sensing and examine accepted methods. Based on that knowledge the bachelor thesis examines some newer techniques as well. The practical part of the work starts with an electrical signal that consists of a square wave with a varied frequency. The signal converts via the software to become a PWM-signal that has a fixed frequency. A low pass filter and a differential amplifier make the signal meet the interface of AK95S. Results from the report shows that the adapting method can work. Some works remain and tests need to show the functionality of the ultrasonic level sensor. The theoretical study shows a different method of liquid level sensing using capacitance. This method is a theoretical option with fewer disadvantages. (Less)
Please use this url to cite or link to this publication:
author
Lovén, Martin
organization
year
type
M2 - Bachelor Degree
subject
keywords
vätskenivågivare, ultraljud, pic microcontroler, Systems engineering, computer technology, Data- och systemvetenskap
language
Swedish
id
1354032
alternative location
http://portal.ch.lu.se/Campus.NET/Services/Publication/Export.aspx?id=1097&type=doc
date added to LUP
2008-10-08
date last changed
2010-04-27 11:11:49
@misc{1354032,
  abstract     = {This bachelor thesis is about an ultrasonic sensor, implemented in a bubble chamber in Artis. The sensor consists of the piezoelectric sensor and an electronic control circuit. The control circuit consists of a programmable microprocessor, PIC18F2420 and a circuit, which sends the excitation signal to the piezoelectric sensor, and later receives the echo. This bachelor thesis consists also of a theoretical study, which examines different techniques of liquid level sensing in a chamber. The study discusses which factors are important in liquid level sensing and examine accepted methods. Based on that knowledge the bachelor thesis examines some newer techniques as well. The practical part of the work starts with an electrical signal that consists of a square wave with a varied frequency. The signal converts via the software to become a PWM-signal that has a fixed frequency. A low pass filter and a differential amplifier make the signal meet the interface of AK95S. Results from the report shows that the adapting method can work. Some works remain and tests need to show the functionality of the ultrasonic level sensor. The theoretical study shows a different method of liquid level sensing using capacitance. This method is a theoretical option with fewer disadvantages.},
  author       = {Lovén, Martin},
  keyword      = {vätskenivågivare,ultraljud,pic microcontroler,Systems engineering, computer technology,Data- och systemvetenskap},
  language     = {swe},
  note         = {Student Paper},
  title        = {Ultraljudsmätare för bubbelfälla},
  year         = {2008},
}