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Non-destructive Determination of Mag...

University of South Carolina., Chemistry.

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Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics./
Author:	Abraham, Alyssa Marie.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	95 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-06, Section: A.
Contained By:	Dissertations Abstracts International81-06A.
Subject:	Analytical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13902815
ISBN:	9781687953186

Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics.
Abraham, Alyssa Marie.

Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 95 p.

Source: Dissertations Abstracts International, Volume: 81-06, Section: A.

Thesis (Ph.D.)--University of South Carolina, 2019.

This item is not available from ProQuest Dissertations & Theses.

This dissertation focuses on creating a non-destructive method for the identification of degraded magnetic audio tapes using attenuated total reflectance Fourier transform infrared spectroscopy (ATR FT-IR) and chemometrics. The primary recording medium during the second half of the twentieth century was magnetic tapes. These tapes hold some of the world's modern cultural history. Unfortunately, the majority of these tapes were made with a polyester urethane (PEU) binder, which has shown to degrade through hydrolysis of the ester component, called sticky shed syndrome (SSS). As the name implies, degraded tapes will stick and shed onto player guides and heads during playback. This can irreversibly destroy the data, since the binder layer houses the magnetic particles responsible for the content. Therefore, libraries, institutions, and archives are digitizing their collections. The first half of this manuscript focuses on creating a model that can accurately determine degradation using a non-destructive approach for a mixture of tape manufacturers and models. Eleven different brand/model tapes were used, acquired from three different sources. Principal component analysis (PCA), followed by quadratic discriminant analysis (QDA) was used for classification. This was successfully performed for 95.19% of the calibration set consisting of 154 tapes and 97.79% of the test set, containing 52 tapes. The second half of this manuscript focuses on applying this model to external tape test sets that were not used in the creation of the model. It was determined that the different binders and additives included during the manufacturing process would affect the model. Therefore, a new calibration model was created from the original 154-tape set. The new model was validated yielding a 94.64% accuracy. It was tested with the original 52-tape test set, correctly identifying the degradation status for 95.58% of those tapes. The model was then externally validated with tapes acquired from the Library of Congress (LC) and University of Maryland (UMD). The model successfully identified 90.79% of the LC tapes and 78.85% of the UMD tapes. The outcome of this work will greatly enhance preservationists' goal of triaging magnetic audio tape before digitization.

ISBN: 9781687953186Subjects--Topical Terms:

3168300
Analytical chemistry.
Subjects--Index Terms:

Analytical Chemistry

Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics.
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100 1 $a Abraham, Alyssa Marie. $3 3480508
245 1 0 $a Non-destructive Determination of Magnetic Audio Tape Degradation for Various Tape Chemistries Using Spectroscopy and Chemometrics.
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300 $a 95 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-06, Section: A.
500 $a Advisor: Morgan, Stephen L.
502 $a Thesis (Ph.D.)--University of South Carolina, 2019.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation focuses on creating a non-destructive method for the identification of degraded magnetic audio tapes using attenuated total reflectance Fourier transform infrared spectroscopy (ATR FT-IR) and chemometrics. The primary recording medium during the second half of the twentieth century was magnetic tapes. These tapes hold some of the world's modern cultural history. Unfortunately, the majority of these tapes were made with a polyester urethane (PEU) binder, which has shown to degrade through hydrolysis of the ester component, called sticky shed syndrome (SSS). As the name implies, degraded tapes will stick and shed onto player guides and heads during playback. This can irreversibly destroy the data, since the binder layer houses the magnetic particles responsible for the content. Therefore, libraries, institutions, and archives are digitizing their collections. The first half of this manuscript focuses on creating a model that can accurately determine degradation using a non-destructive approach for a mixture of tape manufacturers and models. Eleven different brand/model tapes were used, acquired from three different sources. Principal component analysis (PCA), followed by quadratic discriminant analysis (QDA) was used for classification. This was successfully performed for 95.19% of the calibration set consisting of 154 tapes and 97.79% of the test set, containing 52 tapes. The second half of this manuscript focuses on applying this model to external tape test sets that were not used in the creation of the model. It was determined that the different binders and additives included during the manufacturing process would affect the model. Therefore, a new calibration model was created from the original 154-tape set. The new model was validated yielding a 94.64% accuracy. It was tested with the original 52-tape test set, correctly identifying the degradation status for 95.58% of those tapes. The model was then externally validated with tapes acquired from the Library of Congress (LC) and University of Maryland (UMD). The model successfully identified 90.79% of the LC tapes and 78.85% of the UMD tapes. The outcome of this work will greatly enhance preservationists' goal of triaging magnetic audio tape before digitization.
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650 4 $a Library science. $3 539284
653 $a Analytical Chemistry
653 $a Chemometrics
653 $a Machine Learning
653 $a Magnetic Audio Tape
653 $a Preservation
653 $a Spectroscopy
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690 $a 0399
710 2 0 $a University of South Carolina. $b Chemistry. $3 1020774
773 0 $t Dissertations Abstracts International $g 81-06A.
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13902815