System makes use of diverging duct walls for conducting the light from entrance slips to the conductors by means of multiple reflectors. This system simultaneously records, photoelectrically, the intensities of several closely spaceed narrow wavelengths in the ultraviolet and infrared areas of the spectrum

Roth, D. E.

Rothe, D. E.

English

NASA Technical Reports Server

November 1969
	 Brief 69-10550 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information-, Springfield, Virginia 22151. 
Multichannel Spectroscopy Guide 
Light channels diverge	 Aluminized 
for high transmission	 on One Side 
efficiency. 
The problem: 
To simultaneously record, photoelectrically, the 
intensities of several closely-spaced narrow wave-
length areas (for instance, in the ultraviolet and 
infrared) of the light spectrum. In cases such as shock-
tube work, which impose severe restrictions on the 
time available to obtain the data, it is not practical 
to scan the spectrum with a single photomultiplier
and a separate detector must be used for each wave-
length area to be investigated. 
The solution: 
A system that makes use of diverging duct walls 
for conducting the light from the entrance slits to the 
conductors by means of multiple reflectors. These 
ducts consist of polyester strips aluminized on the 
inner sides to provide light paths with minimum 
absorption losses in the ultraviolet and infrared areas 
of the spectrum. These strips are mounted in matching, 
grooved, aluminized blocks that maintain proper 
alignment of the ducts for optimum light delivery to 
the various photomultiplier tubes. 
This arrangement is designed for the study of con-
tinuous spectra so that the wavelength interval 
accepted by each channel can be changed by using 
different masks and different slit widths in the spec-
tral plane. A variation for the simultaneous measure-
ment of the intensities of randomly displaced spectral 
lines can be readily accomplished by making each 
duct self-contained and movable. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Headquarters 
National Aeronautics 
and Space Administration 
Washington, D.C. 20546 
Reference: B69-10550 
Patent status: 
No patent action is contemplated by NASA. 
Source: D. E. Rothe of 
Cornell Aeronautical Laboratory, Inc. 
under contract to 
NASA Headquarters 
(HQN-10441) 
Category 01 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the Uniteø States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
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Multichannel spectroscopy guide

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