Bench test model of the human skull for testing the Variable Frequency Pulse Phase-Locked Loop Instrument
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Authors
Burin, Amy Diana
Subjects
Human skull model
pulse phase-locked loop
intracranial pressure
intracranial distance
pulse phase-locked loop
intracranial pressure
intracranial distance
Advisors
Scrivener, Sandra L.
Date of Issue
1996-12
Date
December 1996
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The Variable Frequency Pulse Phase-Locked Loop (VFPPLL) instrument is currently being used to non-invasively evaluate the human skull for increases in intracranial distances brought about by increases in intracranial pressure. It is designed to determine distance changes, in the sub-micron range, calculated from changes in frequency of an ultrasonic toneburst produced by a transducer, traversed through the skull and received back by the transducer. A bench test model of the human skull will calibrate the VFPPLL by comparing known distance changes to the VFPPLL derived distance changes, and thereby verify the accuracy of the instrument. Additionally, the bench test model will determine a broad range of operating limits on temperature, pressure and elongation over which the VFPPLL can operate accurately. Each of the three models made demonstrates a different effect on the frequency change based on the different parameters, i.e. temperature, pressure or elongation. The Open Channel Model compares closely approximated elongations with VFPPLL derived elongations, showing favorable results for calibration of the VFPPLL instrument. Specifications for creating a bench test model of the human skull for testing the VFPPLL instrument are established in this thesis.
Type
Thesis
Description
Series/Report No
Department
Department of Aeronautics and Astronautics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
xviii, 118 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.