Application of acoustic metrology for detection of plate thickness change

Cherng, John G.; Chen, X.F.; Peng, V.

doi:10.1016/s0263-2241(96)00057-7

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…Very less literature is available of using acoustic pressure for structural health monitoring. For damage detection, Cherng et al [12] applied an acoustic methodology to detect changes in plate thickness. Jiang et al [13] proposed a passive acoustic method for material damage detection using non-contact acoustic pressure measurements.…”

Section: Introductionmentioning

confidence: 99%

Acoustic-based damage detection method

2014

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Section: Introductionmentioning

confidence: 99%

Acoustic-based damage detection method

2014

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“…Much work has been devoted to the development of equipment for noncontact thickness or length measurement for automatic manufacturing research, real-time monitoring, and the achievement of optimal production quality. Information management equipment is highly accurate and highly sensitive, has a perfect function structure and little volume, and is convenient to maintain [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Vision-based Automatic System for Non-contact Measurement of Morphometric Characteristics of Flatfish

Jeong¹,

Yang²,

Lee³

et al. 2013

Journal of Electrical Engineering and Technology

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-This paper introduces a vision-based automatic system (VAMS) for non-contact measurement of morphometric characteristics of flatfish, such as total length (TL), body width (BW), height (H), and weight (W). The H and W are simply measured by a laser displacement and a load cell, respectively. The TL and BW are measured by a proposed morphological image processing algorithm. The proposed algorithm cans measurement, when the tail of flatfish is deformed, and when it is randomly oriented. In the experiment, the average and maximum measurement errors were recorded, and standard deviations and coefficients of variation (CVs) for the measurements were calculated. From those results, when flatfish the TL measurements had an average of 266.844 mm, a standard deviation of 0.351 mm, a CV of 0.131%, and a maximum error of 0.87 mm with straightened flatfish (TL A : 267 mm, BW A : 141 mm), and when flatfish of different sizes were measured, the errors in the TL and BW measurements were both about 0.2 %. Using a single conveyor, the VAMS can process up to 900 fishes per hour. Moreover, it can measure morphometric characteristics of flatfish with a TL of up to 500 mm.

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“…other methods of thickness determination [6]- [11] exist. They are based on guided lamb waves in plates of constant thickness [6], [10], on thickness resonances in plates and cylindrical shells [7]- [9], or on reflected beam spectra [11], but in the knowledge of the authors, no one uses the adiabatic behavior of guided waves in guides with continuously varying section.…”

Section: Introductionmentioning

confidence: 99%