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An Investigation on PVDF Piezoelectric Elements and Linear Array Transducers

Alkhudri, Ali LU (2017) In TVBA-5000 VTA820 20162
Engineering Acoustics
Department of Construction Sciences
Abstract
Ultrasonic waves are widely used in different application e.g. for sonar scanning in water and fetal imaging. Furthermore it is used for doing measurements on different materials to determine the thickness of the material or the velocity of sound inside it. The ultrasonic waves are produced and detected by using piezoelectric elements based on e.g. Polyvinylidene fluoride (PVDF)-film or Lead Zirconate Titanate (PZT)-elements. In this thesis project the aim has been to do measurements on different materials and then develop a linear array transducer based on the use of PVDF-films. Three different methods have been studied to do the measurements on different materials. The first method has been to use a commercial product (ultrasonic (US)... (More)
Ultrasonic waves are widely used in different application e.g. for sonar scanning in water and fetal imaging. Furthermore it is used for doing measurements on different materials to determine the thickness of the material or the velocity of sound inside it. The ultrasonic waves are produced and detected by using piezoelectric elements based on e.g. Polyvinylidene fluoride (PVDF)-film or Lead Zirconate Titanate (PZT)-elements. In this thesis project the aim has been to do measurements on different materials and then develop a linear array transducer based on the use of PVDF-films. Three different methods have been studied to do the measurements on different materials. The first method has been to use a commercial product (ultrasonic (US) key and software from Lecoeur), the second method has been to use the same US-key but in combination with MATLAB. The US-key is an ultrasonic device which is connected to ultrasonic transducer(s) to emit and detect ultrasonic waves. The software was used for displaying plots from the measurements. Finally, the third method involved the use of a generator and an oscilloscope. It has been found that the first and second methods did not work properly to make the linear array transducer because the US-key produced a noise artifact during measurements. The linear array transducer was made by using two industrial ultrasonic transducers of 1MHz which were connected to the generator and three PVDF-films used as receivers and connected to the oscilloscope. The linear array transducer was built up to use it for examining a specific materialaluminum. It was found that aluminum is the best material to be used to do the ultrasonic testing because of its low attenuation of the ultrasonic waves. (Less)
Popular Abstract (Swedish)
Ultraljudsvågor används i många olika tillämpningar, t.ex. som sonar i vatten och för fosterdiagnostik. De kan också användas för att göra mätningar på olika material för att bestämma materialets tjocklek eller ljudets hastighet i materialet. Ultraljudsvågorna produceras och detekteras med hjälp av piezoelektriska element, t.ex. polyvinylidenflourid (PVDF)-film eller så kallade PZT-element (blyzirconium-titan). I detta projekt har målet varit att göra mätningar på olika material och sedan utveckla en omvandlare av PVDF-film. Tre olika metoder har studerats för att göra mätningarna på olika material. Första metoden har varit att använda en kommersiell ultraljudsutrustning (”US-key” och programvara från Lecoeur), den andra metoden har varit... (More)
Ultraljudsvågor används i många olika tillämpningar, t.ex. som sonar i vatten och för fosterdiagnostik. De kan också användas för att göra mätningar på olika material för att bestämma materialets tjocklek eller ljudets hastighet i materialet. Ultraljudsvågorna produceras och detekteras med hjälp av piezoelektriska element, t.ex. polyvinylidenflourid (PVDF)-film eller så kallade PZT-element (blyzirconium-titan). I detta projekt har målet varit att göra mätningar på olika material och sedan utveckla en omvandlare av PVDF-film. Tre olika metoder har studerats för att göra mätningarna på olika material. Första metoden har varit att använda en kommersiell ultraljudsutrustning (”US-key” och programvara från Lecoeur), den andra metoden har varit att använda samma hårdvara (”US-key”) i kombination med MATLAB. Hårdvaran är en ultraljudsenhet som ansluts till en eller två ultraljudsgivare för att producera och detektera ultraljudsvågor. Lecoeur-programvaran används för att plotta mätvärdena. Slutligen har en tredje metod provats genom att använda en generator och ett oscilloskop. Det har visat sig att den första och andra metoden inte fungerade bra för att bygga omvandlaren eftersom den kommersiella hårdvaran skapade störningar när mätningarna gjordes. Omvandlaren har därför byggts genom att använda två 1-MHz ultraljudsgivare som har anslutits till en generator och tre PVDF-filmer som mottagare som har anslutits till ett oscilloskop. Omvandlaren har sedan använts för att undersöka ett specifikt material - aluminium. Aluminium har en låg dämpningskoefficient som gör att ultraljudsvågorna inte dämpas för mycket. (Less)
Please use this url to cite or link to this publication:
author
Alkhudri, Ali LU
supervisor
organization
course
VTA820 20162
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Ultrasonic Transducer, Piezoelectric Element, PVDF, Frequency, Ultrasound Wave Penetration, PZT, Acoustic Impedance, raw data, linear array transducer
publication/series
TVBA-5000
report number
TVBA-5053
ISSN
0281-8477
language
English
id
8914301
alternative location
http://www.akustik.lth.se/publikationer/tvba-5000-examensarbeten/
date added to LUP
2017-06-28 09:32:17
date last changed
2017-06-28 09:32:17
@misc{8914301,
  abstract     = {Ultrasonic waves are widely used in different application e.g. for sonar scanning in water and fetal imaging. Furthermore it is used for doing measurements on different materials to determine the thickness of the material or the velocity of sound inside it. The ultrasonic waves are produced and detected by using piezoelectric elements based on e.g. Polyvinylidene fluoride (PVDF)-film or Lead Zirconate Titanate (PZT)-elements. In this thesis project the aim has been to do measurements on different materials and then develop a linear array transducer based on the use of PVDF-films. Three different methods have been studied to do the measurements on different materials. The first method has been to use a commercial product (ultrasonic (US) key and software from Lecoeur), the second method has been to use the same US-key but in combination with MATLAB. The US-key is an ultrasonic device which is connected to ultrasonic transducer(s) to emit and detect ultrasonic waves. The software was used for displaying plots from the measurements. Finally, the third method involved the use of a generator and an oscilloscope. It has been found that the first and second methods did not work properly to make the linear array transducer because the US-key produced a noise artifact during measurements. The linear array transducer was made by using two industrial ultrasonic transducers of 1MHz which were connected to the generator and three PVDF-films used as receivers and connected to the oscilloscope. The linear array transducer was built up to use it for examining a specific materialaluminum. It was found that aluminum is the best material to be used to do the ultrasonic testing because of its low attenuation of the ultrasonic waves.},
  author       = {Alkhudri, Ali},
  issn         = {0281-8477},
  keyword      = {Ultrasonic Transducer,Piezoelectric Element,PVDF,Frequency,Ultrasound Wave Penetration,PZT,Acoustic Impedance,raw data,linear array transducer},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVBA-5000},
  title        = {An Investigation on PVDF Piezoelectric Elements and Linear Array Transducers},
  year         = {2017},
}