Water-cooled shield facilitates optical pyrometer high temperature measurements of small sheet metal specimens subjected to tensile stress in fatigue tests. The shield excludes direct or reflected radiation from one face of the specimen and permits viewing of the infrared radiation only

Eichenbrenner, F. F.

Illg, W.

English

NASA Technical Reports Server

.Viewing 
Optical
September 1965
	 Brief 65-10272 
NASA TECH BRIEF H 
NASA Tech Briefs are issued by the Technology Utilization Division to summarize specific 
technical innovations derived from the space program. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical information, Springfield, Virginia, 22151. 
Infrared Shield Facilitates Optical Pyrometer Measurements 
Test Specimen 
Serration 
Coolant Tubing 
The problem: Accurately measuring the tempera-
ture of small sheet metal specimens which are sub-
jected to tensile stresses in fatigue tests at 2,000 0 to 
3,000° F. An optical pyrometer is a preferred instru-
ment for measuring such high temperatures. To ensure 
accurate measurements, this instrument must view 
only the infrared radiation from the heating source or 
other surfaces. None of the heating or temperature-
sensing components must come in contact with the test 
specimen. 
The solution: A water-cooled shield to exclude 
direct or reflected radiation from one face of the metal
specimen and to permit viewing of this face of the 
specimen by an optical pyrometer. 
How it's done: A water-cooled reflector and quartz 
lamp are used to heat the specimen on one side and 
the shield is used to permit pyrometer measurements 
on the other side. The shield assembly is water-cooled 
and has a viewing port for the optical pyrometer. The 
test specimen is placed between the infrared source 
(lamps and reflector) and the shield. A 1/32-inch 
gap is maintained between the specimen and shield. 
Serrated radiation traps are provided on the edges 
of the shield-assembly reservoir to prevent radiation 
leakage through the gap.
(continued overleaf) 
New
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned-rights.
https://ntrs.nasa.gov/search.jsp?R=19650000270 2020-03-11T17:19:35+00:00Z
Note: 
A related invention is described in NASA Tech 
Brief B63-I0345, June 1964. Inquiries may also be 
directed to:
Technology Utilization Officer 
Langley Research Center 
Langley Station 
Hampton, Virginia, 23365 
Reference: B65-10272
Patent status: NASA encourages the immediate 
commercial use of this invention. Inquiries about 
obtaining rights for its commercial use may be made 
to NASA, Code AGP, Washington, D.C., 20546. 
Source: Walter Ilig and Fred F. Eichenbrenner 
(Langley- 133) 
Brief 65-10272	 Category No. 02


Infrared shield facilitates optical pyrometer measurements

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