Document Type

Thesis

Date of Award

1-31-1993

Degree Name

Master of Science in Electrical Engineering - (M.S.)

Department

Electrical Engineering

First Advisor

Walter F. Kosonocky

Second Advisor

Constantine N. Manikopoulos

Third Advisor

Edwin Hou

Abstract

The radiometric model of an IR image sensor has been developed. Based on this model, the application of imaging pyrometry to remote temperature measurements has been investigated. This analysis provides the estimation of temperature accuracy achievable by imaging pyrometry in conjunction with a number of radiometric methods. The detection of radiation emitted across the full spectral bandwidth of the imager as well as utilization of narrow-passband filters was analyzed for a target with known emissivity.

The methods of two-wavelength ratio radiometry and multi-wavelength radiometry were considered for the targets with unknown emissivity. The optimal selection of the wavelengths for the method of ratio radiometry was investigated. It was shown that in the case of a blackbody radiator at 1000 °C the ratio radiometry yields temperature resolution of 0.5 °C for the 106 electrons per pixel signal level detected by 320x244 IR imager with PtSi Schottky-barrier detectors and operated with 100-nm-wide Gaussian filters positioned at 1.5 µm and 3.0 µ. The temperature accuracy achievable by least-squares-based multi-wavelength imaging pyrometry (MWIP) was analyzed for linear and quadratic emissivity models. The presented results have shown that for targets with quadratic spectral emissivity at 1000 °C the 6-filter MWIP is capable of providing temperature resolution of about 1 °C for target temperature of 1000 °C and the maximum signal of 4x106 electrons per pixel. For targets at 500 °C the corresponding accuracy is equal to 0.4 °C.

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