Portable, lightweight system collects the exhaust gas of an aircraft during flight for use in analyzing combustion efficiency. The system uses an evacuated chamber and plastic bags

Shaffernocker, W. M.

English

NASA Technical Reports Server

TO PROBE VACUUM 
SOURCE 
EVACUATED 
HAMBER 
September 1965
	
Brief 65-10264 
NASA TECH 
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. 
Plastic Bags in Evacuated Chamber Make Lightweight Gas Sampling System 
PLASTIC BAG (FILLED) 
PLASTIC BAGS 
(COLLAPSED) 
Notes: 
1. The chamber could be sufficiently evacuated during 
flight by a static pressure port on the side of the 
vehicle. 
The bags must be of a material that is strong and 
impervious to hydrogen diffusion. 
Inquiries concerning this innovation may be 
directed to: 
Technology Utilization Officer 
Flight Research Center 
P.O. Box 273 
Edwards, California, 93523 
Reference: 1365-10264 
are attached to their inlet ports in the collapsed state 
	
and the vacuum chamber and inlet lines are evacuated. 	 Patent status: NASA encourages commercial use 
	
The system is connected to the exhaust gas sampling 	 of this innovation. No patent action is contemplated 
	
probe and the scanning valve operates to fill the	 by NASA. 
	
plastic bags sequentially. Impact pressure at the 	 Source: W. M. Shaffernocker of 
	
sampling probe entrance is sufficient to drive the gas 	 General Electric 
	
into the plastic bags during flight. Bags as small as 	 under contract to 
	
50 ml in volume at an internal pressure of 4 psia	 Flight Research Center 
will collect sufficient gas for laboratory analysis.	 (FRC-3 I) 
Aft	 Category 01 
IF
	
This document was prepared under the sponsorship of the National 	 this document, or that the use of any information, apparatus, method, 
	
Aeronautics and Space Administration. Neither the United States Govern- 	 or process disclosed in this document may not infringe privately-owned 
	
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes	 rights; or B. Assumes any liabilities with respect to the use of, or for 
	
any warranty or representation, express or implied, with respect to the 	 damages resulting from the use of, any information, apparatus, method, 
	
accuracy, completeness, or usefulness of the information contained in	 or process disclosed in this document. 
The problem: The collection of exhaust gas of an 
aircraft or space vehicle during flight for use in analyz-
ing system combustion efficiency. Normal ground test 
systems cannot be applied to flight conditions because 
of the weight and size of the equipment involved. 
The solution: A lightweight, portable system that 
uses an evacuated chamber and plastic bags to collect 
the exhaust gas in flight for later analysis on the 
ground. 
How it's done: Prior to flight, the plastic bags
2.
https://ntrs.nasa.gov/search.jsp?R=19650000262 2020-03-11T17:19:46+00:00Z


Plastic bags in evacuated chamber make lightweight gas sampling system

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