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U.S. Naval Ordnance Laboratory - An Experimental Study of the Feasibility of Measuring the Surface Temperature of a Projectile in Flight by Means of its Thermal Radiation

DSTRACT: A series of preliminaw measuræsntB are described 
Vhlch to detemlne the feaeibillty of meaeuring 
the eurfaee tempemturø Of a 30—eAIibsr proseetllo in f119it 
by means of ite themal radiation. The Izges of 8 serlee of 
the prosectiles are alloved to crou the sensitive aurfaee of R 
lead sulfide Photoconductive cell, the roeulting signals being 
observed *Ith an oscilloscope. The measured pulee hetgtt8 ere 
plotted against the corre8ponding temperaturee of the blackened 
surface vhieh forag the background ror the prosectlles, in the 
of a "vorklng curve" temperature of euceeeding pro— 
Jeetileg be detemined, in principle at least, vith the aid 
or this curve together vith a measurement of the produced 
by them upon croealng a background of bovn tüpenture. 
working curves of this type ere presented, obtained under 
sli91tIy different experlyntal conditions. With the detector 
used these curves seen to indicate that the method cannot be 
u.ed In the ease of prodectlles vith tempentureg belov 1500C; 
above thie tempentnre the data so fer obtained a 
robable error of about ± IOOC in the measurement, provided no 
error of an unhovn nature ex18t8 In the method. It 
1B hoped that improvements in the measuring technique Increaee 
th1B accuracy, at least at higher tempereturee.

This report descrtbee a experimental •tudy 
to detemlne the feasibility of measuring the surface temper- 
aturs of a prosectile In flight by &ans of ite themal radiation. 
The vork vag under NOL—Re9a-108-I. me authors 
Vish to expreu thOir appreciation to Mr. V. vho 
euggested the problem and participated In many helpru' discussions 
regarding the problem. They ere also grateful to Dr. V. Seanlon 
for auggestlng the method of measuring temperature used In this 
Btudy. The study of the various blaekening techalquee vas carried 
out under his supervision. the results reported are of a 
preliminary nature, It iB felt that they bc uaed as a b&8i. 
for a later, mom detailed Btuå$ Of the pmblem.