TITLE

A multi-point laser Doppler vibrometer with fiber-based configuration

AUTHOR(S)
Yang, C.; Guo, M.; Liu, H.; Yan, K.; Xu, Y. J.; Miao, H.; Fu, Y.
PUB. DATE
December 2013
SOURCE
Review of Scientific Instruments;Dec2013, Vol. 84 Issue 12, p121702
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Laser Doppler vibrometer (LDV) is a non-contact optical interferometric system to measure vibrations of structures and machines with a high precision. Normal LDV can only offer a single-point measurement. Scanning LDV is usually impractical to do measurement on transient events. In this paper, a fiber-based self-synchronized multi-point LDV is proposed. The multiple laser beams with different frequency shifts are generated from one laser source. The beams are projected onto a vibrating object, reflected and interfered with a common reference beam. The signal including vibration information of multiple spatial points is captured by one single-pixel photodetector. The optical system is mainly integrated by fiber components for flexibility in measurement. Two experiments are conducted to measure a steady-state simple harmonic vibration of a cantilever beam and a transient vibration of a beam clamped at both ends. In the first measurement, a numerical interpolation is applied to reconstruct the mode shape with increased number of data points. The vibration mode obtained is compared with that from FEM simulation. In transient vibration measurement, the first five resonant frequencies are obtained. The results show the new-reported fiber-based multipoint LDV can offer a vibration measurement on various spatial points simultaneously. With the flexibility of fiber configuration, it becomes more practical for dynamic structural evaluation in industrial areas.
ACCESSION #
93390560

 

Related Articles

  • Evaluation of Measurement Uncertainty in Calibrations of Laser Vibrometers. von Martens, Hans-J├╝rgen // AIP Conference Proceedings;2014, Vol. 1600, p123 

    The international standard for the calibration of laser vibrometers, ISO 16063-41:2011, specifies the instrumentation and procedures for performing primary and secondary calibrations of rectilinear laser vibrometers, as well as the requirements for reporting the calibration results including the...

  • ULTRASONIC TRANSDUCER PEAK-TO-PEAK OPTICAL MEASUREMENT. Skarvada, Pavel; Tofel, Pavel; Tomanek, Pavel // Advances in Electrical & Electronic Engineering;Jun2012, Vol. 10 Issue 2, p125 

    Possible optical setups for measurement of the peak-to-peak value of an ultrasonic transducer are described in this work. The Michelson interferometer with the calibrated nanopositioner in reference path and laser Doppler vibrometer were used for the basic measurement of vibration displacement....

  • Three-dimensional laser scanning vibrometry as a visualisation tool for structural health monitoring research. W. H. Ong; W. K. Chiu; Nadarajah, N. // Australian Journal of Multi-Disciplinary Engineering;2013, Vol. 10 Issue 2, p154 

    The application of three-dimensional scanning laser vibrometry for visualising stress wave propagation in a specimen with a non-surface penetrating defect is presented in this paper. The aim of this paper is to demonstrate the use of this measurement technique to achieve a good insight of the...

  • Development of a scanning head for laser Doppler vibrometry (LDV) using dual optical wedges. Rothberg, S. J.; Tirabassi, M. // Review of Scientific Instruments;Dec2013, Vol. 84 Issue 12, p121704 

    A new laser Doppler vibrometry scanning head is proposed based on a pair of rotating optical wedges. A comprehensive mathematical model is developed and used to demonstrate how the wedges can be configured to scan point-by-point, in a line, in a circle, and in a combination of the two such that...

  • An Innovative Signal Processing Method to Extract Ants' Walking Signals. Oberst, Sebastian; Nava-Baro, Enrique; Lai, Joseph; Evans, Theodore // Acoustics Australia;Apr2015, Vol. 43 Issue 1, p87 

    Eusocial insects such as bees, ants and termites communicate multi-modally using chemical, visual, tactile and vibrational cues. While much work has been done on chemical and visual communications, the tactile and vibrational communication channel is somewhat neglected. Recent research indicates...

  • Measurement of Dynamic Patterns of an Elastic Membrane at Bi-modal Vibration Using High Speed Electronic Speckle Pattern Interferometry. Preciado, Jorge Sanchez; Lopez, Carlos Perez; Santoyo, Fernando Mendoza // AIP Conference Proceedings;2014, Vol. 1600, p196 

    Implementing a hybrid arrangement of Laser Doppler Vibrometry (LDV) and high speed Electronic Speckle Pattern Interferometry (ESPI) we were able to measure the dynamic patterns of a flat rectangular elastic membrane clamped at its edges stimulated with the sum of two resonance frequencies. ESPI...

  • A Review of Digital Image Correlation Applied to Structura Dynamics. Niezrecki, Christopher; Avitabile, Peter; Warren, Christopher; Pingle, Pawan; Helfrick, Mark // AIP Conference Proceedings;5/28/2010, Vol. 1253 Issue 1, p219 

    A significant amount of interest exists in performing non-contacting, full-field surface velocity measurement. For many years traditional non-contacting surface velocity measurements have been made by using scanning Doppler laser vibrometry, shearography, pulsed laser interferometry, pulsed...

  • Application of a Multi-Beam Vibrometer on Industrial Components. Bendel, Karl // AIP Conference Proceedings;2014, Vol. 1600, p251 

    Laser Doppler vibrometry is a well proven tool for the non-contact measurement of vibration. The scanning of several measurement points allows to visualize the deflection shape of the component, ideally a 3D-operating deflection shape, if a 3-D scanner is applied. Measuring the points...

  • Mapping cavitation activity around dental ultrasonic tips. Walmsley, A.; Lea, Simon; Felver, Bernhard; King, David; Price, Gareth // Clinical Oral Investigations;May2013, Vol. 17 Issue 4, p1227 

    Objectives: Cavitation arising within the water around the oscillating ultrasonic scaler tip is an area that may lead to advances in enhancing biofilm removal. The aim of this study is to map the occurrence of cavitation around scaler tips under loaded conditions. Materials and methods: Two...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics