In-plane vibration detection using sampling moiré method

Yadi, Mona; Morimoto, Yoshiharu; Ueki, Masaki; Takaya, Yasuhiro

doi:10.1088/2515-7647/abe4ab

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…Smoothing will be done in the x or y direction in order to calculate displacements in the y and x directions respectively. Performing down-sampling 4,5 in all recorded pixel values yields new brightness data which are used for phase extraction and displacement analysis of the sample in that specific recorded image. Equation ( 2) shows the analyzed brightness amount of each pixel line after down-sampling and intensity interpolation respectively.…”

Section: Methodsmentioning

confidence: 99%

Stroboscopic sampling Moiré microscope (SSMM) for investigation of QTF’s mechanical properties

Yadi,

Uenohara,

Mizutani

et al. 2024

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XXI

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Understanding and accurately analyzing the mechanical properties of microelectromechanical systems (MEMS) is essential for assessing their device functionality and performance. Precisely measuring the dynamic properties of a quartz tuning fork (QTF), for instance, can significantly enhance the imaging resolution of QTF-based scanning probe microscopy systems. Current methods, such as analytical and numerical approaches, have limitations when it comes to providing accurate measurements. To overcome these limitations, we proposed an experimental approach that combines stroboscopic and sampling moiré (SM) techniques. Our method focuses on investigating the in-plane vibration behavior of a QTF and utilizes the obtained results to measure its mechanical parameters.To achieve this, we synchronize nanometer-scale light pulses, generated using a custom-designed stroboscope, with the QTF's excitation voltage, effectively freezing the vibrations. These vibrations are then observed using a standard CCD camera. Subsequently, SM analysis is employed to extract the surface vibration profile, facilitating the measurement of dynamic properties. This technique has the potential to analyze various micro-devices that are compatible with the sample preparation process.

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Section: Methodsmentioning

confidence: 99%

Stroboscopic sampling Moiré microscope (SSMM) for investigation of QTF’s mechanical properties

Yadi,

Uenohara,

Mizutani

et al. 2024

Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XXI

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“…Use the inverse Newton-Gauss iteration method (IC-GN), and its second order shape function is shown in formula (18). Use the inverse Newton-Gauss iteration method (IC-GN), and its second order shape function is shown in formula (18).…”

Section: Right Cameramentioning

confidence: 99%

“…The non-contact measurement method does not need to attach the sensor to the test piece, fundamentally eliminates the influence of additional mass, and has the advantage of high measurement sensitivity. The main methods of optical measurement methods to measure strain include moiré method [17,18], holographic interferometry [19] and digital image correlation method [20].…”

Section: Introductionmentioning

confidence: 99%

Modal Identification of Ultralow-Frequency Flexible Structures Based on Digital Image Correlation Method

Qian

Zhu

et al. 2021

Applied Sciences

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Traditional modal testing has difficult accurately identifying the ultralow-frequency modes of flexible structures. Ultralow-frequency excitation and vibration signal acquisition are two main obstacles. Aiming at ultralow-frequency modal identification of flexible structures, a modal testing method based on Digital Image Correlation method and Eigensystem Realization Algorithm is proposed. Considering impulse and shaker excitation are difficult to make generate ultralow-frequency vibration of structures, the initial displacement is applied to the structure for excitation. The ultralow-frequency accelerometer always has a large mass, which will change the dynamics performance of the flexible structure, so a structural vibration response was obtained through the Digital Image Correlation method. After collecting the free-decay vibration signal, the ultralow-frequency mode of the structure was identified by using the Eigensystem Realization Algorithm. Ground modal tests were conducted to verify the proposed method. Firstly, a solar wing structure was adopted, from which it was concluded that the signal acquisition using Digital Image Correlation method had high feasibility and accuracy. Secondly, an ultralow-frequency flexible cantilever beam structure which had the theoretical solution was employed to verify the proposed method and the theoretical fundamental frequency of the structure was 0.185 Hz. Results show that the Digital Image Correlation method can effectively measure the response signal of the ultralow-frequency flexible structure, and obtain the dynamics characteristics.

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“…From the latter half of the 19th century to the present, a steady stream of academic articles has been dedicated to analyzing and applying the Moiré effect. Examples of applications include the inspection of surface, structure and material defects , measurement of mechanical properties [27][28][29], measurement of position, distance, thickness and vibration of objects [30][31][32][33][34][35][36][37][38][39][40], atmospheric * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Moiré pattern for parallel binary gratings based on AND and OR operators

Khokhuntod,

Kaewpoonsuk

2024

J. Opt.

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A method for analyzing the Moiré pattern of a parallel binary grating based on the high-frequency component of the omitted pattern is proposed. The analysis aims to investigate the signal components that influence the dark-light band formation of the Moiré pattern. The analytical technique begins with the consideration that both grating patterns are a set of binary rectangular signals with two signal level values, “0” and “1.” Subsequently, Fourier series expansion of these two sets of signals was performed considering the frequency, initial phase, and duty cycle of the signals. The superposition of both input signals relies on algebraic equations equivalent to AND and OR operators. The final step was to eliminate the effect of the high-frequency component, which is analogous to the low-pass filter of the electronic circuit (based on averaging the signal intensity per image length). If the frequencies of the two gratings are equal, the analysis based on both operators provides an output signal depending on the initial phase (placement position) and duty cycle values. If the frequencies of the two gratings are not equal, the analysis results show that the output signal has a frequency equal to the frequency difference between the two signals. Moreover, if the two input gratings had a duty cycle of 0.5, the overlapping resulted in a triangular shape. The results from the computer program to simulate the AND and OR operators were consistently compared to the plots of the analytical equations. In addition, they are compatible with image processing results.

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In-plane vibration detection using sampling moiré method

Cited by 6 publications

References 21 publications

Stroboscopic sampling Moiré microscope (SSMM) for investigation of QTF’s mechanical properties

Stroboscopic sampling Moiré microscope (SSMM) for investigation of QTF’s mechanical properties

Modal Identification of Ultralow-Frequency Flexible Structures Based on Digital Image Correlation Method

Analysis of Moiré pattern for parallel binary gratings based on AND and OR operators

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