Cover Image

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...

Full description

Saved in:
Bibliographic Details
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
http://eprints.utm.my/id/eprint/32425/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:72732?site_name=Restricted Repository
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.32425
record_format eprints
spelling my.utm.324252017-09-12T08:39:31Z http://eprints.utm.my/id/eprint/32425/ Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids 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 NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/32425/5/SitiNorFarhaMatRifinMFS2013.pdf Mat Rifin, Siti Norfarha (2013) Photo-acoustic induced by Q-Switched Nd : YAG laser detected by PVDF sensor in different liquids. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:72732?site_name=Restricted Repository
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
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
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
publishDate 2013
url http://eprints.utm.my/id/eprint/32425/5/SitiNorFarhaMatRifinMFS2013.pdf
http://eprints.utm.my/id/eprint/32425/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:72732?site_name=Restricted Repository
_version_ 1643649035524898816
score 13.211869

Similar Items