Ask a Librarian

Threre are lots of ways to contact a librarian. Choose what works best for you.

HOURS TODAY

10:00 am - 3:00 pm

Reference Desk

CONTACT US BY PHONE

(802) 656-2022

Voice

(802) 503-1703

Text

MAKE AN APPOINTMENT OR EMAIL A QUESTION

Schedule an Appointment

Meet with a librarian or subject specialist for in-depth help.

Email a Librarian

Submit a question for reply by e-mail.

WANT TO TALK TO SOMEONE RIGHT AWAY?

Library Hours for Thursday, February 22nd

All of the hours for today can be found below. We look forward to seeing you in the library.
HOURS TODAY
8:00 am - 12:00 am
MAIN LIBRARY

SEE ALL LIBRARY HOURS
WITHIN HOWE LIBRARY

MapsM-Th by appointment, email govdocs@uvm.edu

Media Services8:00 am - 7:00 pm

Reference Desk10:00 am - 3:00 pm

OTHER DEPARTMENTS

Special Collections10:00 am - 6:00 pm

Dana Health Sciences Library7:30 am - 11:00 pm

 

CATQuest

Search the UVM Libraries' collections

UVM Theses and Dissertations

Browse by Department
Format:
Online
Author:
Plante, Owen
Dept./Program:
Mechanical Engineering
Year:
2023
Degree:
M.S.
Abstract:
The classification and study of thermal protection systems (TPS) relies heavily on the accurate measurement of surface temperature. The best way to measure surface temperature in ground test facilities is through optical pyrometery due to the nonintrusive nature of this method. Optical pyrometric devices use the emission of a grey-body curve to calculate temperatures. These devices are left susceptible to parasitic radiation coming from the plasma generated in ground test facilities. The parasitic radiation comes from the emission lines of the test plasma in the investigation region of the devices. The parasitic radiation from the plasma and short comings of devices negate the ability to accurately measure emissivity in ground test facilities. This work developed testing methods to measure the surface temperature and identify potential sources of parasitic radiation. Measured emission suggests SiC in Ar, ZrB2-SiC-W in air, ZrB2-SiC-W in N2, and POCO in air cases all have near 20% change in temperature from the Dual Wavelength Ratio Thermography calculated temperature. All other test cases have 10% change in temperature. This leads to the conclusion that pyrometer in two color mode is 10% off from the true temperature, save for the cases mentioned near the 20% change. Temperatures retrieved from pyrometers are hotter than temperature calculated from the experimental emission .For future works temperature readings from the pyrometer should have a temperature buffer applied to them that is dependent on the material and gas composition. For POCO graphite a buffer of 100 K in Argon, 100 K in N2, 300 K in air, and 200 K in CO2 should be applied. For SiC 300 K in Argon, 200 in N2, 150 K in air, and 150 K in CO2. For ZrB2-SiC-W the temperature readings should include a buffer of 150 K in Argon, 200 K in N2, and 300 K in air.