Moiré interferometry for engineering mechanics: Current practices and future developments

Han, Bongtae; Post, Daniel; Ifju, Peter

doi:10.1243/0309324011512568

Cited by 82 publications

(38 citation statements)

References 61 publications

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“…The system program in this paper completes the measurement of the dynamic changes of fringes and height with respect to time using the above principles [9][10][11][12][13][14].…”

Section: Simplifying Shadow Moiré Methodsmentioning

confidence: 99%

Research on Subcutaneous Pulse Shape Measurement by Near-infrared Moiré Technique

Chen¹,

Liu²,

Du³

et al. 2015

Journal of the Optical Society of Korea

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A pulse is generated when the heart pumps blood into the arterial system. The heart pumps blood only when it contracts, not when it relaxes; therefore, blood enters the arterial system in a cyclical form. Artery beating is visible in some parts of the body surface, such as the radial artery of the wrist. This paper mainly uses the feature in which near-infrared spectroscopy penetrates skin to construct a non-invasive measurement system that can measure small vibration in the subcutaneous tissue of the human body, and then uses it for the pulse measurement. This measurement system uses the optical moiré principle, together with the fringe displacement made by small vibration in the subcutaneous tissue, and an image analysis program to calculate the height variation from small vibrations in the subcutaneous tissue. It completes a measurement system that records height variation with time, and that together with a fast Fourier transform (FFT) program, they can convert the pulse waveform generated by vibration (time-amplitude) to heartbeat frequency (frequency-amplitude). This is a new and non-invasive medical assistance system for measuring the pulse of the human body, with the advantages of being simple, fast, safe and objective.

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“…The system program in this paper completes the measurement of the dynamic changes of fringes and height with respect to time using the above principles [9][10][11][12][13][14].…”

Section: Simplifying Shadow Moiré Methodsmentioning

confidence: 99%

Research on Subcutaneous Pulse Shape Measurement by Near-infrared Moiré Technique

Chen¹,

Liu²,

Du³

et al. 2015

Journal of the Optical Society of Korea

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“…Moiré interferometry [29][30][31][32][33][34][35] provides a sensitive technique for measuring the small surface displacements that occur during hole drilling. Figure 2 schematically shows a typical optical arrangement [33].…”

Section: Moiré Interferometrymentioning

confidence: 99%

Advances in Hole-Drilling Residual Stress Measurements

Schajer

2009

Exp Mech

126

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Residual stress measurements by hole-drilling have developed greatly in both sophistication and scope since the pioneering work of Mathar in the 1930s. Advances have been made in measurement technology to give measured data superior in both quality and quantity, and in analytical capability to give detailed residual stress results from those data. On the technology side, the use of multiple strain gauges, Moiré, Holographic Interferometry and Digital Image Correlation all provide prolific sources of high quality data. In addition, modern analytical techniques using inverse methods provide effective ways of extracting reliable residual stress results from the mass of available data. This paper describes recent advances in both the measurement and analytical areas, and indicates some promising directions for future developments.

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“…Time averaging for holographic applications is presented in [8]. Review of moiré interferometry in experimental mechanics is performed in [9]. Experimental high rate deformation and shock studies are investigated in [10].…”

Section: Introductionmentioning

confidence: 99%

Reflection moiré for the measurement of wing vibrations

Maskeliūnas¹,

Maskeliūnas²,

Ragulskis³

et al. 2018

J. meas. eng.

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Abstract. Investigation of time averaged reflection moiré measurements of vibrations of a wing is performed in this paper. Interpretation of reflection moiré images on a shallow surface of a wing is more complicated than on a plane surface. For this purpose, a special simplified two-dimensional numerical model is developed and the possibilities of application of this method of measurement of vibrations are investigated.

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Moiré interferometry for engineering mechanics: Current practices and future developments

Cited by 82 publications

References 61 publications

Research on Subcutaneous Pulse Shape Measurement by Near-infrared Moiré Technique

Research on Subcutaneous Pulse Shape Measurement by Near-infrared Moiré Technique

Advances in Hole-Drilling Residual Stress Measurements

Reflection moiré for the measurement of wing vibrations

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