High-temperature (> 1000 °C) acoustic emission sensor

2013 ◽  
Author(s):  
Joseph A. Johnson ◽  
Kyungrim Kim ◽  
Shujun Zhang ◽  
Di Wu ◽  
Xiaoning Jiang
Keyword(s):  
Acoustic Emission ◽  
High Temperature ◽  
Acoustic Emission Sensor

Development of High-Temperature Acoustic Emission Sensor Using Aluminium Nitrade Thin Film

2006 ◽  
pp. 111-116 ◽  
Author(s):  
Hiroaki Noma ◽  
E. Ushijima ◽  
Y. Ooishi ◽  
Morito Akiyama ◽  
N. Miyoshi ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Emission ◽  
High Temperature ◽  
Acoustic Emission Sensor

scholarly journals Monitoring of High Temperature Damage of Pipe Utilizing Heat Resistant Optical Fiber Acoustic Emission Sensor

2007 ◽  
Vol 56 (12) ◽  
pp. 560-567 ◽  
Author(s):  
Tomoharu Hayano ◽  
Takuma Matsuo ◽  
Hideo Cho ◽  
Mikio Takemoto
Keyword(s):  
Acoustic Emission ◽  
High Temperature ◽  
Optical Fiber ◽  
Acoustic Emission Sensor ◽  
Heat Resistant ◽  
Temperature Damage

Development of High-Temperature Acoustic Emission Sensor Using Aluminium Nitrade Thin Film

2006 ◽  
Vol 13-14 ◽  
pp. 111-116 ◽  
Author(s):  
Hiroaki Noma ◽  
E. Ushijima ◽  
Y. Ooishi ◽  
Morito Akiyama ◽  
N. Miyoshi ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Emission ◽  
High Temperature ◽  
Gas Turbines ◽  
Elevated Temperatures ◽  
Rf Magnetron Sputtering ◽  
Acoustic Emission Sensor ◽  
Film Sensor ◽  
Sensor Sensitivity ◽  
Sensor Structure

Aluminum nitride (AlN) is a promising Acoustic Emission (AE) sensor element for high-temperature environments such as gas turbines and other plants because AlN maintains its piezoelectricity up to 1200°C. Highly c-axis-oriented AlN thin-film sensor elements were prepared on silicon single crystals by rf magnetron sputtering. Both ordinary-temperature AE sensors and high-temperature AE sensors have been developed using these elements. In this paper, to study effects of d33 and thickness of AlN elements on sensor sensitivity, AlN elements with d33 from 2 to 7 pm/V and thickness from 3 to 9 /m were prepared. It is confirmed that the AE sensor sensitivity increased with d33 and thickness of AlN elements. The sensitivity of the high-temperature AE sensor was also improved by a design of the sensor structure. The sensor characteristics were evaluated at elevated temperatures from 200 to 600°C. It was confirmed that the AE sensor works well at 600°C and does not deteriorate.

Experimental investigation on time-domain features in the diagnosis of rolling element bearings by acoustic emission

2021 ◽  
pp. 107754632110161
Author(s):  
Aref Aasi ◽  
Ramtin Tabatabaei ◽  
Erfan Aasi ◽  
Seyed Mohammad Jafari
Keyword(s):  
Acoustic Emission ◽  
Condition Monitoring ◽  
Time Domain ◽  
Central Moment ◽  
Rolling Element Bearings ◽  
Test Rig ◽  
Acoustic Emission Sensor ◽  
Outer Race ◽  
Common Time ◽  
Rolling Element

Inspired by previous achievements, different time-domain features for diagnosis of rolling element bearings are investigated in this study. An experimental test rig is prepared for condition monitoring of angular contact bearing by using an acoustic emission sensor for this purpose. The acoustic emission signals are acquired from defective bearing, and the sensor takes signals from defects on the inner or outer race of the bearing. By studying the literature works, different domains of features are classified, and the most common time-domain features are selected for condition monitoring. The considered features are calculated for obtained signals with different loadings, speeds, and sizes of defects on the inner and outer race of the bearing. Our results indicate that the clearance, sixth central moment, impulse, kurtosis, and crest factors are appropriate features for diagnosis purposes. Moreover, our results show that the clearance factor for small defects and sixth central moment for large defects are promising for defect diagnosis on rolling element bearings.

scholarly journals Development of a low‐power wireless acoustic emission sensor node for aerospace applications

2021 ◽  
Author(s):  
Stephen Grigg ◽  
Rhys Pullin ◽  
Matthew Pearson ◽  
David Jenman ◽  
Robert Cooper ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Low Power ◽  
Sensor Node ◽  
Acoustic Emission Sensor ◽  
Aerospace Applications

Study of the Metal Crack Propagation by Acoustic Emission Testing

2011 ◽  
Vol 105-107 ◽  
pp. 2179-2182
Author(s):  
Wei Min Zhang ◽  
Shu Xuan Liu ◽  
Yong Qiu ◽  
Cheng Feng Chen
Keyword(s):  
Acoustic Emission ◽  
Crack Propagation ◽  
Acquisition System ◽  
Signal Acquisition ◽  
Sensor Signal ◽  
Acoustic Emission Sensor ◽  
Axial Tension ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Signal Operating

Crack propagation is the main reason which leads to the invalidity of the metal components. A set of detecting equipment based on the acoustic emission method was designed, and it was mainly composed of acoustic emission sensor, signal operating circuits and signal acquisition system. Specimens of 16MnR material were manufactured and the static axial tension test of them was carried on. Acoustic emission signals from the specimen were detected by acoustic emission equipment by using piezoelectric ceramic sensor. Signal datum were acquired and operated by the acquisition system, as well as the acquisition program written for it. The final results has demonstrated that acoustic emission equipment designed for the test performed well in acquiring the signals induced by the metal crack propagation.

Simultaneous Monitoring of Rolling-Element and Journal Bearings Using Analysis of Structure-Born Ultrasound Acoustic Emissions

2010 ◽  
Author(s):  
A. Albers ◽  
M. Dickerhof
Keyword(s):  
Acoustic Emission ◽  
Acoustic Emissions ◽  
Piezoelectric Sensor ◽  
Journal Bearings ◽  
Rolling Element Bearings ◽  
Acoustic Emission Sensor ◽  
Outer Race ◽  
Rolling Element ◽  
Characteristic Values ◽  
Acoustic Emission Technology

The application of Acoustic Emission technology for monitoring rolling element or hydrodynamic plain bearings has been addressed by several authors in former times. Most of these investigations took place under idealized conditions, to allow the concentration on one single source of emission, typically recorded by means of a piezoelectric sensor. This can be achieved by either eliminating other sources in advance or taking measures to shield them out (e. g. by placing the acoustic emission sensor very close to the source of interest), so that in consequence only one source of structure-born sound is present in the signal. With a practical orientation this is often not possible. In point of fact, a multitude of potential sources of emission can be worth considering, unfortunately superimposing one another. The investigations reported in this paper are therefore focused on the simultaneous monitoring of both bearing types mentioned above. Only one piezoelectric acoustic emission sensor is utilized, which is placed rather far away from the monitored bearings. By derivation of characteristic values from the sensor signal, different simulated defects can be detected reliably: seeded defects in the inner and outer race of rolling element bearings as well as the occurrence of mixed friction in the sliding surface bearing due to interrupted lubricant inflow.

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