Date of Award

Spring 1995

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Sacharia Albin

Committee Member

Vishnu K. Lakdawala

Committee Member

Linda Vahala

Call Number for Print

Special Collections LD4331.E55 L383

Abstract

Fiber optic methods have gained acceptance in the past several years as non­ intrusive optical techniques of measuring environmental variables, particularly under hostile conditions. Fiber optic temperature sensors are required for many applications which have a large operating range. One way to implement this sensor is to introduce rare earth-doped materials into a fiber showing temperature-dependent optical emission characteristics. The thermal effects on optical emission characteristics of Y2O3:Eu3+ were studied. The thermal broadening and temperature dependence of the lifetime (τ) of the 611.4 nm emission due to the 5D0 ➔ 7F2 transition were studied in detail in the range of 20 to 850° C. τ was found to be independent of temperature from 20 to 600° C, whereas line broadening depends on temperature in this range. From 600 to 850° C, τ was found to decrease with temperature. This was shown to be due to non-radiative multiphonon emission processes. This result can be applied towards high temperature sensing using an optical fiber containing Y2O3:Eu3+ powder.

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DOI

10.25777/a5gb-6y36

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