Applications of Acoustic Emission Techniques to Rock and Rock Structures: A State-of-the-Art Review

2009 ◽  
pp. 4-4-89 ◽  
Author(s):  
HR Hardy
Keyword(s):  
Acoustic Emission ◽  
State Of The Art

scholarly journals MEMS Acoustic Emission Sensors

2020 ◽  
Vol 10 (24) ◽  
pp. 8966
Author(s):  
Didem Ozevin
Keyword(s):  
Acoustic Emission ◽  
State Of The Art ◽  
Signal To Noise Ratio ◽  
Frequency Bandwidth ◽  
Micro Electro Mechanical Systems ◽  
Design Variables ◽  
Transduction Mechanisms ◽  
Acoustic Emission Sensors ◽  
Ae Signal ◽  
Constitutive Properties

This paper presents a review of state-of-the-art micro-electro-mechanical-systems (MEMS) acoustic emission (AE) sensors. MEMS AE sensors are designed to detect active defects in materials with the transduction mechanisms of piezoresistivity, capacitance or piezoelectricity. The majority of MEMS AE sensors are designed as resonators to improve the signal-to-noise ratio. The fundamental design variables of MEMS AE sensors include resonant frequency, bandwidth/quality factor and sensitivity. Micromachining methods have the flexibility to tune the sensor frequency to a particular range, which is important, as the frequency of AE signal depends on defect modes, constitutive properties and structural composition. This paper summarizes the properties of MEMS AE sensors, their design specifications and applications for detecting the simulated and real AE sources and discusses the future outlook.

scholarly journals Feasibility of detecting orthopaedic screw overtightening using acoustic emission

2017 ◽  
Vol 231 (3) ◽  
pp. 213-221 ◽  
Author(s):  
Rhys Pullin ◽  
Bryan J Wright ◽  
Richard Kapur ◽  
John P McCrory ◽  
Matthew Pearson ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Human Error ◽  
Current Practice ◽  
State Of The Art ◽  
Screw Fixation ◽  
Measuring Devices ◽  
Current State ◽  
Emission Activity ◽  
Hip Screw ◽  
Preliminary Study

A preliminary study of acoustic emission during orthopaedic screw fixation was performed using polyurethane foam as the bone-simulating material. Three sets of screws, a dynamic hip screw, a small fragment screw and a large fragment screw, were investigated, monitoring acoustic-emission activity during the screw tightening. In some specimens, screws were deliberately overtightened in order to investigate the feasibility of detecting the stripping torque in advance. One set of data was supported by load cell measurements to directly measure the axial load through the screw. Data showed that acoustic emission can give good indications of impending screw stripping; such indications are not available to the surgeon at the current state of the art using traditional torque measuring devices, and current practice relies on the surgeon’s experience alone. The results suggest that acoustic emission may have the potential to prevent screw overtightening and bone tissue damage, eliminating one of the commonest sources of human error in such scenarios.

A Review of Acoustic Emission Technique for Machinery Condition Monitoring: Defects Detection & Diagnostic

2012 ◽  
Vol 229-231 ◽  
pp. 1476-1480 ◽  
Author(s):  
Salah M. Ali Al-Obaidi ◽  
M. Salman Leong ◽  
R.I. Raja Hamzah ◽  
Ahmed M. Abdelrhman
Keyword(s):  
Acoustic Emission ◽  
Condition Monitoring ◽  
State Of The Art ◽  
The State ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Acoustic Emission Technique ◽  
Destructive Testing ◽  
Machinery Condition Monitoring ◽  
Non Destructive

Acoustic emission (AE) measurements are one of many non-destructive testing methods which had found applications in defects detection in machines. This paper reviews the state of the art in AE based condition monitoring with particular emphasis on rotating and reciprocating machinery applications. Advantages and limitations of the AE technique in comparison to other condition monitoring techniques in detecting common machinery faults are also discussed.

scholarly journals State-of-the-Art Review on the Acoustic Emission Source Localization Techniques

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Farrukh Hassan ◽  
Ahmad Kamil Mahmood ◽  
Norashikin Yahya ◽  
Abdul Saboor ◽  
Muhammad Zahid Abbas ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Source Localization ◽  
State Of The Art ◽  
Emission Source ◽  
Acoustic Emission Source

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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