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Predicting Properties of a Material Utilizing a Highly Nonlinear Solitary Wave (HNSW) Transducer

Hodgson, Madison (2023) Predicting Properties of a Material Utilizing a Highly Nonlinear Solitary Wave (HNSW) Transducer. Master's Thesis, University of Pittsburgh. (Unpublished)

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The use of highly nonlinear solitary waves (HNSWs) to nondestructively evaluate materials has recently emerged and is a promising method with several key advantages over other inspection technologies. The technique is based on the actuation and detection of solitary waves that are made to propagate along an array of spheres (arranged much like a newton’s cradle) and through a specimen. HNSW measurement devices require an array of spheres in an HNSW transducer configuration, an electromagnet, and a sensor. For this thesis, a portable, low-power, wireless transducer was designed, assembled, and tested. The novel transducer design of this work allows HNSW measurements to be taken without wired connections or bulky electronic test equipment and in settings not previously possible. The reliability of the device’s measurements was determined by carrying out comparative tests whereby a conventional HNSW transducer and the novel design of this work were used to evaluate a variety of hard and soft materials. The first set of experiments characterized 45 samples of both steel and low-density Sawbones. The results of the experiments show that the instrument can accurately operate without the support of electronic equipment and with enough accuracy to be useful in real-world settings. In addition to the hard materials, HNSWs were collected from PDMS, and goat corneas to mimic evaluation of the human eye. The PDMS and cornea samples pressurized from 10mmHg to 30mmHg at 5mmHg increments, simulating intraocular pressure variations that occur in patients afflicted with glaucoma. The data was analyzed using a variety of machine learning algorithms and features to automatically extract IOP values from HSNW signals captured by the device were determined. The results show that the device can successfully distinguish clinically relevant IOP levels in eyes.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Hodgson, Madisonmah531@pitt.edumah5310000-0003-3453-541X
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee CoChairDickerson, Samuel J.dickerson@pitt.edusjdst31
Committee MemberGeorge,
Committee MemberAkcakaya,
Committee CoChairRizzo, Piervincenzopir3@pitt.edupir3
Date: 13 June 2023
Date Type: Publication
Defense Date: 7 April 2023
Approval Date: 13 June 2023
Submission Date: 15 March 2023
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 72
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical and Computer Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Highly nonliear solitary waves, intraocular pressure, transducer, classification
Date Deposited: 13 Jun 2023 14:03
Last Modified: 13 Jun 2023 14:03

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