The application of high-speed TV-holography to time-resolved vibration measurements

C. Buckberry, M. Reeves, A. J. Moore, D. P. Hand, J. S. Barton, J. D C Jones

Research output: Contribution to journalArticle

Abstract

We describe an electronic speckle pattern interferometer (ESPI) system that has enabled non-harmonic vibrations to be measured with µs temporal resolution. The short exposure period and high framing rate of a high-speed camera at up to 40,500 frames per second allow low-power CW laser illumination and fibre-optic beam delivery to be used, rather than the high peak power pulsed lasers normally used in ESPI for transient measurement. The technique has been demonstrated in the laboratory and tested in preliminary industrial trials. The ability to measure vibration with high spatial and temporal resolution, which is not provided by techniques such as scanning laser vibrometry, has many applications in manufacturing design, and in an illustrative application described here revealed previously unmeasured "rocking" vibrations of a car door. It has been possible to make the measurement on the door as part of a complete vehicle standing on its own tyres, wheels and suspension, and where the excitation was generated by the running of the vehicle's own engine. © 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)387-394
Number of pages8
JournalOptics and Lasers in Engineering
Volume32
Issue number4
Publication statusPublished - 2000

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vibration measurement
holography
speckle patterns
high speed
temporal resolution
vibration
vehicles
interferometers
tires
high speed cameras
wheels
electronics
lasers
engines
fiber optics
pulsed lasers
delivery
manufacturing
spatial resolution
illumination

Cite this

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abstract = "We describe an electronic speckle pattern interferometer (ESPI) system that has enabled non-harmonic vibrations to be measured with µs temporal resolution. The short exposure period and high framing rate of a high-speed camera at up to 40,500 frames per second allow low-power CW laser illumination and fibre-optic beam delivery to be used, rather than the high peak power pulsed lasers normally used in ESPI for transient measurement. The technique has been demonstrated in the laboratory and tested in preliminary industrial trials. The ability to measure vibration with high spatial and temporal resolution, which is not provided by techniques such as scanning laser vibrometry, has many applications in manufacturing design, and in an illustrative application described here revealed previously unmeasured {"}rocking{"} vibrations of a car door. It has been possible to make the measurement on the door as part of a complete vehicle standing on its own tyres, wheels and suspension, and where the excitation was generated by the running of the vehicle's own engine. {\circledC} 2000 Elsevier Science Ltd. All rights reserved.",
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The application of high-speed TV-holography to time-resolved vibration measurements. / Buckberry, C.; Reeves, M.; Moore, A. J.; Hand, D. P.; Barton, J. S.; Jones, J. D C.

In: Optics and Lasers in Engineering, Vol. 32, No. 4, 2000, p. 387-394.

Research output: Contribution to journalArticle

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AU - Buckberry, C.

AU - Reeves, M.

AU - Moore, A. J.

AU - Hand, D. P.

AU - Barton, J. S.

AU - Jones, J. D C

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AB - We describe an electronic speckle pattern interferometer (ESPI) system that has enabled non-harmonic vibrations to be measured with µs temporal resolution. The short exposure period and high framing rate of a high-speed camera at up to 40,500 frames per second allow low-power CW laser illumination and fibre-optic beam delivery to be used, rather than the high peak power pulsed lasers normally used in ESPI for transient measurement. The technique has been demonstrated in the laboratory and tested in preliminary industrial trials. The ability to measure vibration with high spatial and temporal resolution, which is not provided by techniques such as scanning laser vibrometry, has many applications in manufacturing design, and in an illustrative application described here revealed previously unmeasured "rocking" vibrations of a car door. It has been possible to make the measurement on the door as part of a complete vehicle standing on its own tyres, wheels and suspension, and where the excitation was generated by the running of the vehicle's own engine. © 2000 Elsevier Science Ltd. All rights reserved.

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