A φ-OTDR Sensor for High-frequency Distributed Vibration Measurements with Minimal Post-processing

2017 ◽  
Author(s):  
Y. Muanenda ◽  
C.J. Oton ◽  
S. Faralli ◽  
F. Di Pasquale
Keyword(s):  
High Frequency ◽  
Post Processing ◽  
Vibration Measurements

Identifying Radius of Rebar Buried in Concrete Massif by Using Electromagnetic Penetrating Radar

2015 ◽  
Vol 789-790 ◽  
pp. 1119-1122
Author(s):  
Zoubaida Mechbal ◽  
Abdellatif Khamlichi
Keyword(s):  
High Frequency ◽  
Steel Reinforcement ◽  
Post Processing ◽  
Concrete Member ◽  
Short Pulses ◽  
Essential Information

In this work, identification of rebar radius for a single steel reinforcement buried in a concrete member was investigated. A method based on electromagnetic penetrating radar was proposed. The principle of this method consists of working with adequate high frequency antennas that emit short pulses and measure the reflected echoes from the discontinuities present inside the medium. Image post-processing of the obtained B-scan radargrams enabled to extract essential information which has facilitated the derivation of a correlation formula to estimate the rebar radius. Predictions made by this formula were found to achieve better accuracy than previously known methods.

Super-high frequency apparatus for vibration measurements

1971 ◽  
Vol 14 (11) ◽  
pp. 1690-1692
Author(s):  
F. I. Kolomoitsev ◽  
N. P. Bystryakov ◽  
E. M. Snezhko ◽  
G. I. Nalcha ◽  
A. S. Kharagai
Keyword(s):  
High Frequency ◽  
Vibration Measurements ◽  
Super High Frequency ◽  
Frequency Apparatus

Low-frame-rate single camera system for 3D full-field high-frequency vibration measurements

2019 ◽  
Vol 123 ◽  
pp. 143-152 ◽  
Author(s):  
Sandro Barone ◽  
Paolo Neri ◽  
Alessandro Paoli ◽  
Armando Viviano Razionale
Keyword(s):  
High Frequency ◽  
Frame Rate ◽  
Single Camera ◽  
Camera System ◽  
Vibration Measurements ◽  
Full Field ◽  
High Frequency Vibration ◽  
Low Frame Rate

Low-coherence fibre heterodyne interferometer for both dc and high-frequency vibration measurements in the inner ear

1998 ◽  
Vol 45 (4) ◽  
pp. 765-775 ◽  
Author(s):  
Ernst Dalhoff ◽  
Ralf Gärtner ◽  
Ulrich Hofbauer ◽  
Hans Tiziani ◽  
Hans-Peter Zenner ◽  
...  
Keyword(s):  
Inner Ear ◽  
High Frequency ◽  
Vibration Measurements ◽  
Heterodyne Interferometer ◽  
High Frequency Vibration ◽  
Low Coherence

Noise Briefs: Inherent Limitations of Accelerometers for High‐Frequency Vibration Measurements

Noise Control ◽  
1961 ◽  
Vol 7 (4) ◽  
pp. 37-37 ◽  
Author(s):  
Fred Schloss
Keyword(s):  
High Frequency ◽  
Vibration Measurements ◽  
High Frequency Vibration

scholarly journals Digital Image Correlation Based on Projected Pattern for High Frequency Vibration Measurements

2017 ◽  
Vol 11 ◽  
pp. 1592-1599 ◽  
Author(s):  
Sandro Barone ◽  
Paolo Neri ◽  
Alessandro Paoli ◽  
Armando Razionale
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
High Frequency ◽  
Image Correlation ◽  
Vibration Measurements ◽  
High Frequency Vibration

Uncertainty analysis of high frequency image-based vibration measurements

Measurement ◽  
2013 ◽  
Vol 46 (8) ◽  
pp. 2630-2637 ◽  
Author(s):  
Giulio D’Emilia ◽  
Laura Razzè ◽  
Emanuele Zappa
Keyword(s):  
Uncertainty Analysis ◽  
High Frequency ◽  
Vibration Measurements

Optical Stereo-System for Full-Field High-Frequency 3D Vibration Measurements Based on Low-Frame-Rate Cameras

2019 ◽  
pp. 155-164
Author(s):  
Sandro Barone ◽  
Paolo Neri ◽  
Alessandro Paoli ◽  
Armando V. Razionale ◽  
Leonardo Bertini ◽  
...  
Keyword(s):  
High Frequency ◽  
Frame Rate ◽  
Vibration Measurements ◽  
Full Field ◽  
Low Frame Rate

scholarly journals Rotor Vibration Measurements Using Laser Doppler Vibrometry: Essential Post-Processing for Resolution of Radial and Pitch/Yaw Vibrations

2005 ◽  
Vol 128 (1) ◽  
pp. 8-20 ◽  
Author(s):  
Ben J. Halkon ◽  
Steve J. Rothberg
Keyword(s):  
Measurement Errors ◽  
Laser Doppler ◽  
Post Processing ◽  
Rotor Vibration ◽  
Laser Doppler Vibrometry ◽  
Vibration Measurements ◽  
Engine Vibration ◽  
Major Application ◽  
The Individual ◽  
First Time

Laser Doppler vibrometry is now a well established technique enabling noncontact vibration measurements in the most challenging of environments. Rotor vibration measurements are often highlighted as a major application of laser vibrometers due to their noncontact operation and inherent immunity to shaft runout. In such measurements, resolution of the individual axial and torsional vibration components is possible via particular arrangement of the laser beam(s). Resolution of the radial or pitch/yaw vibration components, however, can only be achieved by essential post-processing of the data from simultaneous orthogonal measurements. This paper describes the principle and rigorous examination of a novel, dedicated resolution algorithm enabling, for the first time, real-time post-processing of the outputs from standard commercial instruments. The system performed well, even in the presence of noise and other typical measurement errors, and was implemented successfully in an engine vibration study.

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