Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids

A Q-switched Nd:YAG laser beam with short pulsed duration of 6 ns and energy 60 mJ at a wavelength 1064 nm was focused via a camera lens into a glass container occupied by liquid samples. The laser pulse focused at a small area creates an optical breakdown followed by plasma formation. This induced...

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Main Author:	Mat Rifin, Siti Norfarha
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/32425/5/SitiNorFarhaMatRifinMFS2013.pdf
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id	my-utm-ep.32425
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spelling	my-utm-ep.324252017-09-12T08:39:31Z Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids 2013-01 Mat Rifin, Siti Norfarha Q Science (General) A Q-switched Nd:YAG laser beam with short pulsed duration of 6 ns and energy 60 mJ at a wavelength 1064 nm was focused via a camera lens into a glass container occupied by liquid samples. The laser pulse focused at a small area creates an optical breakdown followed by plasma formation. This induced shock wave formation followed by acoustic wave in the liquid medium. The acoustic wave generated was detected using a Piezo sensor coupled with preamplifier of 1 GO input impedance. Difference distances of source to transducer were configured. Difference sample solutions such as distilled water, sodium chloride (NaCl) solutions and white grape juice were used. Properties of acoustic wave, such as the attenuation (amplitude voltage), transient pressure, and dominant component frequency were observed. It was found experimentally that spatial extent of the generation breakdown can affect the acoustic signature and Fourier spectrum of photo-acoustic response where the amplitude and the transient pressure of the signals increase when the distance of the source-sensor decrease. The voltage amplitude for white grape juice and distilled water samples at a distance of 10 mm, were 4.57 V and 4.75 V respectively while for the transient pressure, the value were 481.46 kPa and 500.42 kPa respectively. The presence of ions in aqueous solution can also affect its photo-acoustic response due to water molecule association, where OH band strongly attached to hydrogen-bond water molecule and the other part of band deals with free molecules. The attenuation effect in electrolyte solutions (NaCl) was found to be larger, compared to other samples where the amplitude at lower concentration was 0.40V, with pressure of 42.14 kPa. The frequency of photo-acoustic Fourier spectrum for distilled water and white grape juice samples were found at lower frequency ranging from 24 kHz - 60 kHz but for NaCl solutions the frequencies were higher ranging from 44.06 kHz – 144.16 kHz. 2013-01 Thesis http://eprints.utm.my/id/eprint/32425/ http://eprints.utm.my/id/eprint/32425/5/SitiNorFarhaMatRifinMFS2013.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:72732?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Mat Rifin, Siti Norfarha Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
description	A Q-switched Nd:YAG laser beam with short pulsed duration of 6 ns and energy 60 mJ at a wavelength 1064 nm was focused via a camera lens into a glass container occupied by liquid samples. The laser pulse focused at a small area creates an optical breakdown followed by plasma formation. This induced shock wave formation followed by acoustic wave in the liquid medium. The acoustic wave generated was detected using a Piezo sensor coupled with preamplifier of 1 GO input impedance. Difference distances of source to transducer were configured. Difference sample solutions such as distilled water, sodium chloride (NaCl) solutions and white grape juice were used. Properties of acoustic wave, such as the attenuation (amplitude voltage), transient pressure, and dominant component frequency were observed. It was found experimentally that spatial extent of the generation breakdown can affect the acoustic signature and Fourier spectrum of photo-acoustic response where the amplitude and the transient pressure of the signals increase when the distance of the source-sensor decrease. The voltage amplitude for white grape juice and distilled water samples at a distance of 10 mm, were 4.57 V and 4.75 V respectively while for the transient pressure, the value were 481.46 kPa and 500.42 kPa respectively. The presence of ions in aqueous solution can also affect its photo-acoustic response due to water molecule association, where OH band strongly attached to hydrogen-bond water molecule and the other part of band deals with free molecules. The attenuation effect in electrolyte solutions (NaCl) was found to be larger, compared to other samples where the amplitude at lower concentration was 0.40V, with pressure of 42.14 kPa. The frequency of photo-acoustic Fourier spectrum for distilled water and white grape juice samples were found at lower frequency ranging from 24 kHz - 60 kHz but for NaCl solutions the frequencies were higher ranging from 44.06 kHz – 144.16 kHz.
format	Thesis
qualification_level	Master's degree
author	Mat Rifin, Siti Norfarha
author_facet	Mat Rifin, Siti Norfarha
author_sort	Mat Rifin, Siti Norfarha
title	Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
title_short	Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
title_full	Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
title_fullStr	Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
title_full_unstemmed	Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids
title_sort	photo-acoustic induced by q-switched nd : yag laser detected by pvdf sensor in different liquids
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2013
url	http://eprints.utm.my/id/eprint/32425/5/SitiNorFarhaMatRifinMFS2013.pdf
_version_	1747815999388778496

Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids

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