Discussion on the absolute calibration of piezoelectric acoustic emission sensors

2016 ◽  
Author(s):  
Longbiao He ◽  
Yuying Wang ◽  
Haijiang Zhu ◽  
Ping Yang
Keyword(s):  
Acoustic Emission ◽  
Absolute Calibration ◽  
Acoustic Emission Sensors ◽  
The Absolute

scholarly journals A comparison of two methods for absolute calibration of acoustic emission sensors

2018 ◽  
Author(s):  
I. Panteleev ◽  
N. Saveleva ◽  
A. Prokhorov ◽  
A. Vshivkov
Keyword(s):  
Acoustic Emission ◽  
Absolute Calibration ◽  
Acoustic Emission Sensors

Application of System Identification to the Absolute Calibration of Acoustic Emission Signals

1994 ◽  
Vol 116 (4) ◽  
pp. 562-566 ◽  
Author(s):  
Pei-Ling Liu ◽  
Tseng-Hwa Song ◽  
Tsung-Tsong Wu
Keyword(s):  
Acoustic Emission ◽  
System Identification ◽  
Source Function ◽  
Characteristic Curve ◽  
Absolute Calibration ◽  
Vertical Force ◽  
Glass Capillary ◽  
Plate Fracture ◽  
Identification Approach ◽  
The Absolute

This paper studies the absolute calibration of acoustic emission signals. The experiments were conducted on a thin plate. Fracture of a glass capillary was adopted to generate a vertical force with a unit-step source function, and an NBS conical transducer was used to record the surface response. It is found that the output of the conical transducer contains surplus wiggles and exhibits amplitude decay. The system identification method is introduced to determine the dynamic model of the system. Calibration using the system model successfully recovers the amplitude and greatly suppresses the surplus wiggles. The method is further improved by subtracting the characteristic curve of the wiggles from the experimental data before the system identification approach is carried out.

Acoustic Emission Sensors using Silicon Mechanical Resonators

2015 ◽  
Vol 135 (12) ◽  
pp. 484-489
Author(s):  
Kengo Takata ◽  
Takashi Sasaki ◽  
Mitsutomo Nishizawa ◽  
Hiroshi Saito ◽  
Shinsuke Yamazaki ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Mechanical Resonators ◽  
Acoustic Emission Sensors

scholarly journals Application of Fiber Bragg Grating Acoustic Emission Sensors in Thin Polymer-Bonded Explosives

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3778 ◽  
Author(s):  
Tao Fu ◽  
Peng Wei ◽  
Xiaole Han ◽  
Qingbo Liu
Keyword(s):  
Acoustic Emission ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Location Method ◽  
Thin Polymer ◽  
Time Coefficient ◽  
Polymer Bonded Explosives ◽  
Acoustic Emission Sensors

Fiber Bragg grating (FBG) acoustic emission (AE) sensors have been used in many applications. In this paper, based on an FBG AE sensor, the sensing principle of the interaction between the AE wave and the sensor is introduced. Then, the directionality of the FBG AE sensor on the surface of a thin polymer-bonded explosive (PBX) material is studied. Finally, the time coefficient location method is proposed to correct the AE time detected by the FBG AE sensor, thereby improving the accuracy of location experiments.

scholarly journals Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

2018 ◽  
Vol 10 (11) ◽  
pp. 1679 ◽  
Author(s):  
Jean-François Crétaux ◽  
Muriel Bergé-Nguyen ◽  
Stephane Calmant ◽  
Nurzat Jamangulova ◽  
Rysbek Satylkanov ◽  
...  
Keyword(s):  
Satellite System ◽  
Reference Points ◽  
Absolute Calibration ◽  
In Situ Data ◽  
Absolute Bias ◽  
Weather Stations ◽  
Field Campaigns ◽  
The Absolute ◽  
Gps System ◽  
Water Height

Calibration/Validation (C/V) studies using sites in the oceans have a long history and protocols are well established. Over lakes, C/V allows addressing problems such as the performance of the various retracking algorithms and evaluating the accuracy of the geophysical corrections for continental waters. This is achievable when measurements of specific and numerous field campaigns and a ground permanent network of level gauges and weather stations are processed. C/V consists of installation of permanent sites (weather stations, limnigraphs, and GPS reference points) and the organization of regular field campaigns. The lake Issykkul serves as permanent site of C/V, for a multi-mission purpose. The objective of this paper is to calculate the altimeter biases of Jason-3 and Sentinel-3A, both belonging to an operational satellite system which is used for the long-term monitoring of lake level variations. We have also determined the accuracy of the altimeters of these two satellites, through a comparison analysis with in situ data. In 2016 and 2017, three campaigns have been organized over this lake in order to estimate the absolute bias of the nadir altimeter onboard the Jason-3 and Sentinel-3A. The fieldwork consisted of measuring water height using a GPS system, carried on a boat, along the track of the altimeter satellite across the lake. It was performed at the time of the pass of the altimeter. Absolute altimeter biases were calculated by averaging the water height differences along the pass of the satellite (GPS from the boat system versus altimetry). Jason-3 operates in a Low Resolution Mode (LRM), while the Sentinel-3A operates in Synthetic Aperture Radar (SAR) mode. In this study we found that the absolute biases measured for Jason-3 were −28 ± 40 mm with the Ocean retracker and 206 ± 30 mm with the Ice-1 retracker. The biases for Sentinel-3A were −14 ± 20 mm with the Samosa (Ocean like) retracker and 285 ± 20 mm with the OCOG (Ice-1-like) retracker. We have also evaluated the accuracy of these two altimeters over Lake Issykkul which reached to 3 cm, for both the instruments, using the Ocean retracker.

scholarly journals Crack detection in riveted lap joints using fiber laser acoustic emission sensors

2017 ◽  
Vol 25 (16) ◽  
pp. 19457 ◽  
Author(s):  
G. A. Cranch ◽  
L. Johnson ◽  
M. Algren ◽  
S. Heerschap ◽  
G. A. Miller ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fiber Laser ◽  
Crack Detection ◽  
Lap Joints ◽  
Acoustic Emission Sensors ◽  
Riveted Lap Joints
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