Quick-release spring holder secures acoustic sensor to test material surface eliminating adhesive bonding to test material and achieving acoustic emission evaluation from tensile tests. Reusability of sensors reduces test cost

Mcmahon, W.

Scherba, E. S.

English

NASA Technical Reports Server

Transducer Cable 
Plastic Coated 
Release	 Pressure Spring 
Trip 
Off Cene ...-
Grip 
Pull Rod ' 
Test._...,.. 
Item
. Teflon 
Sleeve 
Id- Down 
Spring 
1972	 B72-10076 
.
NASA TECH BRIEF 
Manned Spacecraft Center 	 A 
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. 
Quick Release Acoustic Sensor Holding Fixture 
Transducer 
set-up using the sensor holding fixture for recording the 
the acoustic emission from a specimen of cryogenic in-
sulation bonded to aluminum. This device allows reuse 
of the acoustic sensor, thus lowering the cost of each 
test. 
How it's done: 
A viscous coupling compound applied to the con-
tact surface of the acoustic sensor insures surface to 
surface contact. Advancing the pressure spring on the 
holding device applies proper pressure between the 
acoustic sensor and the item under test. The off-center 
grip automatically maintains the applied pressure dur-
ing test. A push on the release trip quickly lifts the 
acoustic sensor off the test item without damaging 
the sensor or the test item. The pull rod can be modified 
easily as required for different test items. 
Note:
No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center, Code JM7 
Houston, Texas 77058 
Reference: TSP72- 10076 
Patent status: 
No patent action is contemplated by NASA. 
Source: William McMahon and Emil S. Scherba 
North American Rockwell Corp. 
under contract to
Manned Spacecraft Center 
(MSC-17457) 
Category: 02 
The problem: 
To eliminate adhesive bonding of an acoustic sen-
sor to a test material and still achieve accurate acoustic 
emission evaluation from tensile tests. This would reduce 
the cost of each test since the sensors could be reused. 
The solution: 
A quick-release spring holder secures the acoustic 
sensor (transducer) to the test material surface without 
adhesive bonding. The illustration shows a typical test
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Aeronautics and Space Administration. Neither the United 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.
https://ntrs.nasa.gov/search.jsp?R=19720000076 2020-03-17T03:24:11+00:00Z


Quick release acoustic sensor holding fixture

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