Thermal and spectral response characterisation of solid samples using photothermal technique

In this study, a polyvinylidene difluoride (PVDF) film was used as a pyroelectric detector in the lateral distance scanning technique to determine the thermal diffusivity of solid samples. The samples of interest were aluminuim, copper and spray paint. The values were very close to the values obt...

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Main Author:	Ling, Yoke Ting
Format:	Thesis
Language:	English English
Published:	2001
Subjects:	Photothermal spectroscopy Spectral sensitivity Thermal diffusivity
Online Access:	http://psasir.upm.edu.my/id/eprint/9247/1/FSAS_2001_21.pdf
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spelling	my-upm-ir.92472024-02-13T04:05:02Z Thermal and spectral response characterisation of solid samples using photothermal technique 2001-11 Ling, Yoke Ting In this study, a polyvinylidene difluoride (PVDF) film was used as a pyroelectric detector in the lateral distance scanning technique to determine the thermal diffusivity of solid samples. The samples of interest were aluminuim, copper and spray paint. The values were very close to the values obtained by previous works. Next, the open photoacoustic cell (Ope) technique was used for measuring thermal diffusivity of ferrite samples. The values obtained were in the range of 0.3 cm2s- 1 to 0.5 cm2s-1. EDAX analysis proved that zinc loss happened when the sample was sintered at high temperature and the loss was accompanied by sample shrinkage and density increment. Thus, the thermal diffusivity value increased with the amount of zinc loss during the sintering process. A photopyroelectric spectroscopic (P2ES) technique was developed and applied to solid samples such as poly-methyl methacrylate doped with methylene red (PMMAMR), poly-methylmethacrylate doped with Rhodamine B (PMMA-RB) and plant leaves to see the absorption and transmission spectrum range of samples. The spectra obtained showed that they were of transmission type as predicted by Mandelis and Zver. The sample condition, that was fls< Ls, Ip>Ls, in obtaining the spectrum agreed with Mandelis and Zver's prediction. The trend of optical transmission spectrum fm doped PMMA-MR suggests that it could be used as a cut off filter in the range of 525nm and below to 400nm. The spectrum of PMMA-RB showed an absorption range between 500 to 550nm and a highly transmitted region above 600nm. The P2E spectra of leaf obtained were in line to the leaf absorption spectrum obtained by Lima et a1. A young leaf has a higher signal compared to a mature leaf because it is thinner and thus the optical absorption length is longer than the mature leaf. At the saturated transmission spectral region, the logarithmic signal of all these samples was found decreasing linearly with square root of chopping frequency, agreeing to Rosencwaig and Gersho's prediction. The spectrum of ferrite samples showed that the spectrum was similar to that of light source because its optical length, Ip, was still small compared to sample thickness, Ls. Photothermal spectroscopy Spectral sensitivity Thermal diffusivity 2001-11 Thesis http://psasir.upm.edu.my/id/eprint/9247/ http://psasir.upm.edu.my/id/eprint/9247/1/FSAS_2001_21.pdf text en public masters Universiti Putra Malaysia Photothermal spectroscopy Spectral sensitivity Thermal diffusivity Faculty of Science and Environmental Studies Zakaria, Azmi English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Zakaria, Azmi
topic	Photothermal spectroscopy Spectral sensitivity Thermal diffusivity
spellingShingle	Photothermal spectroscopy Spectral sensitivity Thermal diffusivity Ling, Yoke Ting Thermal and spectral response characterisation of solid samples using photothermal technique
description	In this study, a polyvinylidene difluoride (PVDF) film was used as a pyroelectric detector in the lateral distance scanning technique to determine the thermal diffusivity of solid samples. The samples of interest were aluminuim, copper and spray paint. The values were very close to the values obtained by previous works. Next, the open photoacoustic cell (Ope) technique was used for measuring thermal diffusivity of ferrite samples. The values obtained were in the range of 0.3 cm2s- 1 to 0.5 cm2s-1. EDAX analysis proved that zinc loss happened when the sample was sintered at high temperature and the loss was accompanied by sample shrinkage and density increment. Thus, the thermal diffusivity value increased with the amount of zinc loss during the sintering process. A photopyroelectric spectroscopic (P2ES) technique was developed and applied to solid samples such as poly-methyl methacrylate doped with methylene red (PMMAMR), poly-methylmethacrylate doped with Rhodamine B (PMMA-RB) and plant leaves to see the absorption and transmission spectrum range of samples. The spectra obtained showed that they were of transmission type as predicted by Mandelis and Zver. The sample condition, that was fls< Ls, Ip>Ls, in obtaining the spectrum agreed with Mandelis and Zver's prediction. The trend of optical transmission spectrum fm doped PMMA-MR suggests that it could be used as a cut off filter in the range of 525nm and below to 400nm. The spectrum of PMMA-RB showed an absorption range between 500 to 550nm and a highly transmitted region above 600nm. The P2E spectra of leaf obtained were in line to the leaf absorption spectrum obtained by Lima et a1. A young leaf has a higher signal compared to a mature leaf because it is thinner and thus the optical absorption length is longer than the mature leaf. At the saturated transmission spectral region, the logarithmic signal of all these samples was found decreasing linearly with square root of chopping frequency, agreeing to Rosencwaig and Gersho's prediction. The spectrum of ferrite samples showed that the spectrum was similar to that of light source because its optical length, Ip, was still small compared to sample thickness, Ls.
format	Thesis
qualification_level	Master's degree
author	Ling, Yoke Ting
author_facet	Ling, Yoke Ting
author_sort	Ling, Yoke Ting
title	Thermal and spectral response characterisation of solid samples using photothermal technique
title_short	Thermal and spectral response characterisation of solid samples using photothermal technique
title_full	Thermal and spectral response characterisation of solid samples using photothermal technique
title_fullStr	Thermal and spectral response characterisation of solid samples using photothermal technique
title_full_unstemmed	Thermal and spectral response characterisation of solid samples using photothermal technique
title_sort	thermal and spectral response characterisation of solid samples using photothermal technique
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science and Environmental Studies
publishDate	2001
url	http://psasir.upm.edu.my/id/eprint/9247/1/FSAS_2001_21.pdf
_version_	1794018809080709120

Thermal and spectral response characterisation of solid samples using photothermal technique

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