Thermal emitter array: prediction of apparent blackbody temperature and thermal nonuniformity remedies

James Lynn Smith

doi:10.1117/12.316360

13 July 1998 Thermal emitter array: prediction of apparent blackbody temperature and thermal nonuniformity remedies

James Lynn Smith

Proceedings Volume 3368, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing III; (1998) https://doi.org/10.1117/12.316360
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

Theory and data were used to characterize apparent blackbody temperature spatial variation for a thermal emitter array and determine its dependence on sensor wavelength. The effect of inactive resistor cells was also explored. Two kinds of spatial variations are (1) nonuniformities between the operating characteristics of different thermal array cells and (2) periodic variation due to spatially varying temperature within each cell. Essential developments were (a) curves for determining how thermal effects measured in one sensor band translate to that for another spectral band, (b) analysis of measured data in a one-temperature model and a two-temperature model, and (c) quantification of a defocus remedy for decreasing contrast between inactive and active cells. It is concluded that (A) apparent blackbody temperature and spatial variations thereof are lower for high wavelengths than at 2 microns, (B) use of a uniform, one-temperature blackbody model leads to the consequence of an exaggerated effective emissivity decrease at higher wavelengths, and (C) defocus circle diameter of 1.75 times the array cell spacing promotes optimum operation. This work was performed in Eglin's Guided Weapons Evaluation Facility (GWEF).

Citation Download Citation

James Lynn Smith "Thermal emitter array: prediction of apparent blackbody temperature and thermal nonuniformity remedies", Proc. SPIE 3368, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing III, (13 July 1998); https://doi.org/10.1117/12.316360

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Black bodies

Sensors

Modulation transfer functions

Collimators

Resistors

Data modeling

Thermal modeling

Show All Keywords

Keywords/Phrases

Search In:

Publication Years