Helium gas jet spectral calibration of acoustic emission transducers and systems

1976 ◽  
Vol 54 (17) ◽  
pp. 1824-1830 ◽  
Author(s):  
S. L. McBride ◽  
T. S. Hutchison
Keyword(s):  
Acoustic Emission ◽  
Structural Response ◽  
Gas Jet ◽  
Spectral Information ◽  
Mechanical Contact ◽  
Calibration Source ◽  
Response Mapping ◽  
Spectral Calibration ◽  
Helium Gas ◽  
Produce System

The excitation and spectral calibration of acoustic emission systems using a helium gas jet is shown to produce system independent acoustic emission spectral information. The calibration source makes no mechanical contact with the specimen or structure under investigation and can be conveniently used for specimen or structural response mapping.

Absolute calibration of the helium gas jet noise source

1978 ◽  
Vol 56 (5) ◽  
pp. 504-507 ◽  
Author(s):  
S. L. McBride ◽  
T. S. Hutchison
Keyword(s):  
Acoustic Emission ◽  
Amplitude Spectrum ◽  
Acoustic Emission Event ◽  
Emission Source ◽  
Gas Jet ◽  
Absolute Calibration ◽  
Maximum Value ◽  
Helium Gas ◽  
Acoustic Emission Source ◽  
Source Event

A helium gas jet produces a convenient and reproducible localized (point source) displacement spectrum over the frequency range 0.2–1.0 MHz. The calibration spectrum has a maximum value of 10 Å at 200 kHz and decreases approximately logarithmically with increasing frequency to about 0.2 Å at 0.8 MHz. Comparison of a detected voltage spectrum for an acoustic emission event with the helium gas jet system spectrum permits the displacement amplitude spectrum of the acoustic emission source event to be determined using the calibration spectrum. The source event spectrum thus obtained can be transferred between different systems via the helium gas jet system spectra.The knowledge of the actual localized displacement spectrum associated with an acoustic emission source event should permit quantitative deductions to be made about the relation between the observed acoustic emission signals and the micro-failure processes that give rise to the acoustic emission events.

Acoustic emission characteristics of underwater gas jet from a horizontal exhaust nozzle

2013 ◽  
Vol 74 (6) ◽  
pp. 845-849 ◽  
Author(s):  
Weiwei Xu ◽  
Zhounian Lai ◽  
Dazhuan Wu ◽  
Leqin Wang
Keyword(s):  
Acoustic Emission ◽  
Gas Jet ◽  
Emission Characteristics

Novel telescope-mounted spectral calibration source for the CFHT

1998 ◽  
Author(s):  
Barney L. Magrath ◽  
Robin Arsenault ◽  
Gregory A. Barrick ◽  
Pierre Martin ◽  
Bernt Grundseth ◽  
...  
Keyword(s):  
Calibration Source ◽  
Spectral Calibration

The use of the helium gas jet in the analysis of acoustic emissions

1978 ◽  
Vol 11 (4) ◽  
pp. 175-178 ◽  
Author(s):  
G.A. Green ◽  
P. Dingwall
Keyword(s):  
Acoustic Emissions ◽  
Gas Jet ◽  
Helium Gas

Extra ion feature of Thomson scattered light in the interaction of a 600 ps laser with helium gas jet

2003 ◽  
Vol 10 (2) ◽  
pp. 495-501 ◽  
Author(s):  
V. Malka ◽  
E. De Wispelaere ◽  
Ph. Mounaix ◽  
S. Hüller ◽  
F. Amiranoff ◽  
...  
Keyword(s):  
Scattered Light ◽  
Gas Jet ◽  
Helium Gas
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