Bridge circuit, in which conductive elastomeric material is the variable leg, precisely measures surface area changes in the human body. Circuits are used singularly, or in quantity by adding elements and amplifier circuits. Elastomeric strips can be located in a form-fitting garment

Gause, F. L.

Glenn, C. G.

English

NASA Technical Reports Server

FcbruarN 1971	 CORRECTED COPY 
NASA TECH BRIEF 
Marshall Space Flight Center
Brief 71-10032 
H 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Conductive Elastomeric Extensometer 
A bridge circuit, in which a conductive elastomeric 
material is the variable leg, precisely measures surface 
area changes in the human body. The circuit, of in-
terest to flail ulactu rers ul olulileulcal pleL uiio-
graphs or extensometers, readily detects and measures 
changes caused by heartbeat, bfeathing, muscle 
flexing, or negative pressure (vacuum) environments 
on all or part of the body. 
The bridge circuit output is fed into an integrated 
circuit amplifier. During operation, any change in 
volume causes an unbalanced condition and a current
flow from the bridge to the amplifier. The amplifier 
output (volts) is compatible with recorders, voltmeters, 
oscilloscopes, and other appropriate devices. 
The circuits can be used singularly, or in quantity 
by simply adding elements and amplifier circuits. If 
a large area of the body is to be monitored, the con-
ductive elastometer strips can be located in a form-
fitting garment. 
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&TS-TU 
Huntsville, Alabama 35812 
Reference: B71-10032 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to: 
Patent Counsel 
Mail Code A&TS- PAT 
George C. Marshall Space Flight Center 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Source: Dr. F. L. Gause and C. G. Glenn
Marshall Space Flight Center 
(MFS-2 1049) 
Category 01 
I his document was prepared under the sponsorship of the National 	 Governmtht assumes any liability resulting from the use of the 
\eronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such USC 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
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Conductive elastomeric extensometer

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