Quantitative vibration amplitude measurement with time-averaged digital speckle pattern interferometry

Wai On Wong; K. T. Chan

doi:10.1016/S0030-3992(98)00059-0

Quantitative vibration amplitude measurement with time-averaged digital speckle pattern interferometry

Wai On Wong, K. T. Chan

Research output: Journal article publication › Journal article › Academic research › peer-review

15 Citations (Scopus)

Abstract

A new method of using time-averaged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. Signal processing techniques especially the Hilbert transformation for quantitative evaluation of the Bessel fringes obtained in time-averaged digital speckle pattern interferometry were explored. The quadrature signal after Hilbert transformation is equivalent to a 90° phase-shifted interferogram for a monotonically increasing or decreasing phase function. An algorithm was developed for Bessel fringe contrast enhancement and phase extraction. The techniques were tested numerically and experimentally. Sub-fringe quantification of the time-averaged vibration fringes is realised with the proposed method. Compared with the commonly used phase shift method which requires a minimum of two images for image processing, this method requires only one fringe pattern for data extraction.

Original language	English
Pages (from-to)	317-324
Number of pages	8
Journal	Optics and Laser Technology
Volume	30
Issue number	5
DOIs	https://doi.org/10.1016/S0030-3992(98)00059-0
Publication status	Published - 1 Jan 1998

Keywords

Digital speckle pattern interferometry
Hilbert transformation
Quantitative vibration measurement
Time-average

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

More information

10.1016/S0030-3992(98)00059-0

Cite this

@article{96c825ff47ec40dc8ff601ee00b15c97,

title = "Quantitative vibration amplitude measurement with time-averaged digital speckle pattern interferometry",

abstract = "A new method of using time-averaged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. Signal processing techniques especially the Hilbert transformation for quantitative evaluation of the Bessel fringes obtained in time-averaged digital speckle pattern interferometry were explored. The quadrature signal after Hilbert transformation is equivalent to a 90° phase-shifted interferogram for a monotonically increasing or decreasing phase function. An algorithm was developed for Bessel fringe contrast enhancement and phase extraction. The techniques were tested numerically and experimentally. Sub-fringe quantification of the time-averaged vibration fringes is realised with the proposed method. Compared with the commonly used phase shift method which requires a minimum of two images for image processing, this method requires only one fringe pattern for data extraction.",

keywords = "Digital speckle pattern interferometry, Hilbert transformation, Quantitative vibration measurement, Time-average",

author = "Wong, {Wai On} and Chan, {K. T.}",

year = "1998",

month = jan,

day = "1",

doi = "10.1016/S0030-3992(98)00059-0",

language = "English",

volume = "30",

pages = "317--324",

journal = "Optics and Laser Technology",

issn = "0030-3992",

publisher = "Elsevier Ltd",

number = "5",

}

TY - JOUR

T1 - Quantitative vibration amplitude measurement with time-averaged digital speckle pattern interferometry

AU - Wong, Wai On

AU - Chan, K. T.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - A new method of using time-averaged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. Signal processing techniques especially the Hilbert transformation for quantitative evaluation of the Bessel fringes obtained in time-averaged digital speckle pattern interferometry were explored. The quadrature signal after Hilbert transformation is equivalent to a 90° phase-shifted interferogram for a monotonically increasing or decreasing phase function. An algorithm was developed for Bessel fringe contrast enhancement and phase extraction. The techniques were tested numerically and experimentally. Sub-fringe quantification of the time-averaged vibration fringes is realised with the proposed method. Compared with the commonly used phase shift method which requires a minimum of two images for image processing, this method requires only one fringe pattern for data extraction.

AB - A new method of using time-averaged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. Signal processing techniques especially the Hilbert transformation for quantitative evaluation of the Bessel fringes obtained in time-averaged digital speckle pattern interferometry were explored. The quadrature signal after Hilbert transformation is equivalent to a 90° phase-shifted interferogram for a monotonically increasing or decreasing phase function. An algorithm was developed for Bessel fringe contrast enhancement and phase extraction. The techniques were tested numerically and experimentally. Sub-fringe quantification of the time-averaged vibration fringes is realised with the proposed method. Compared with the commonly used phase shift method which requires a minimum of two images for image processing, this method requires only one fringe pattern for data extraction.

KW - Digital speckle pattern interferometry

KW - Hilbert transformation

KW - Quantitative vibration measurement

KW - Time-average

UR - http://www.scopus.com/inward/record.url?scp=0032108130&partnerID=8YFLogxK

U2 - 10.1016/S0030-3992(98)00059-0

DO - 10.1016/S0030-3992(98)00059-0

M3 - Journal article

VL - 30

SP - 317

EP - 324

JO - Optics and Laser Technology

JF - Optics and Laser Technology

SN - 0030-3992

IS - 5

ER -