Optimum Image Extraction and Phase Analysis for ESPI Measurements Under Environmental Disturbance

Arikawa, Shuichi; Ashizawa, K.; Koga, K.; Yoneyama, Satoru

doi:10.1007/s11340-016-0142-5

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…The experimental results showed the measurement accuracy was not satisfying and the direction of roll was not determined. The applications of dualbeam DSPI in roll measurement have also been reported in recent years, but the measurement models were not clear [25,26]. In 2016, our published research result revealed an exact relationship and approximate relationship between the roll angle and the DSPI interferometric phase [27].…”

Section: Introductionmentioning

confidence: 81%

“…Theoretical analysis reveals this kind of inplane displacement is equivalent to an inplane deformation. If a dualbeam DSPI [26,30,31] is used for measurement, the roll motion will result in the generation of a phase map which contains a set of parallel linear fringes. In turn, the roll can be determined by calculating the phase distribution or the corresponding defor mation distribution.…”

Section: Principlementioning

confidence: 99%

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Precision roll angle measurement based on digital speckle pattern interferometry

Yang

et al. 2019

Meas. Sci. Technol.

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An approach to precise measurement of small roll angle based on digital speckle pattern interferometry (DSPI) is introduced. A simple relationship between the roll angle and interferometric phase distribution is established by analyzing the mechanism of fringe formation in the process of roll detection using a dual-beam DSPI, and reasonable approximate processing. The presented method enjoys some important advantages, such as being free of a cooperative target and a very high measurement resolution. In our experiments, a measurement resolution of 1 µrad, which can compete with the best resolution of the existing methods, is achieved. Theoretically, the measurement resolution can even be improved to tens of nano-radians at the cost of increasing the size of the measuring device. The performance of the method is also demonstrated by a comparison experiment.

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Section: Introductionmentioning

confidence: 81%

Section: Principlementioning

confidence: 99%

Precision roll angle measurement based on digital speckle pattern interferometry

Yang

et al. 2019

Meas. Sci. Technol.

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“…The three-dimensional position of the target object is displayed virtually, and the target is determined by changes in the position of the object. The three combinations have very practical applications [21][22].…”

Section: A Image Target Extraction In Machine Visionmentioning

confidence: 99%

Martial Arts Routine Difficulty Action Technology VR Image Target Real-Time Extraction Simulation

Sun

Shi-hong

et al. 2020

IEEE Access

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With the gradual increase in the difficulty of competitive martial arts, athletes must complete fine, stable, high-quality and difficult movements in order to achieve excellent performance. The real-time extraction of martial arts movements is a topic that many martial arts enthusiasts care about. This research mainly discusses the real-time extraction and simulation of VR image targets of martial arts routine difficulty action technology. Considering the complex characteristics of martial arts movements, this article will analyze the preprocessing content of existing images. This includes image enhancement and image filtering, and uses median filtering methods to enhance the characteristics of the collected images. In this way, the visual effect of the original image can be improved, and the processed image will contribute to the subsequent segmentation. A new image segmentation method is proposed for the color model of the image. According to the H component of the HSV model representing the characteristics of chromaticity, the color image is transformed into the HSV model, and the H component is extracted. The histogram concept applies to H components. Based on the histogram of the H component, the segmentation threshold is determined, and the cropping target in the image is detected. Because the model space is very sensitive to color, VR technology is used to automatically determine the segmentation target. Combined with the above division methods, the automatic extraction of objects in the image is completed. The method of using VR technology for image extraction processing has high precision, and the error value is 3.92%<5%. The research results show that the VR segmentation results are good, suitable for image segmentation in complex backgrounds and automatic image extraction in complex backgrounds.

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“…The exciting frequency which can induce the local maximum response amplitude of the object is corresponding to the natural frequency. The traditional optical path of TA-ESPI based on the arrangement of the Michelson interferometer is susceptive to the environment noise, even airflow disturbance can introduce additional fringes (phase) during deformation measurement [9,30]. Therefore, the identification of natural frequencies of the object based on recognizing the density of the fringes of the mode shape is rough and laborious, which will further increase the calculation errors of the elastic moduli.…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of the elastic moduli of optimized cantilever beams by efficient time-averaged ESPI system

Ma¹,

Quan²,

Yang³

et al. 2022

Meas. Sci. Technol.

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Elastic moduli, including Young's modulus, shear modulus, bulk modulus, etc., are key parameters that are used to characterize the ability of a solid material to resist various types of deformation. The moduli can be extracted from the natural frequencies of a cantilever beam. In this paper, the relationships between moduli and natural frequencies, for the first time, are quantified by the finite element method(FEM). The optimized three-dimensional proportion of the cantilever beam is selected to be implemented simple error compensation. Experimentally, to precisely obtain the natural frequencies of the cantilever beam, an efficient time-averaged electronic speckle pattern interferometry(ESPI) system has been developed. The efficiency and precision are reflected in the following aspects: firstly, according to the slender character of the cantilever beam, a large shear optical path arrangement is designed to facilitate isolation from environmental interference; secondly, a resonance search method, based on the moiré effect is employed to recognize the natural frequencies accurately and efficiently; thirdly, a novel dynamic phase-shifting method is proposed based on the arrangement of the large shear optical path for clearer visualization of the mode shape of the cantilever beam. The proposed methods are verified by three kinds of common materials. The results suggest that Young's modulus and shear modulus derived from natural frequencies are higher than the known value, and the error compensation can significantly reduce the calculation error. Furthermore, the experiments carried out on the woven carbon fiber reinforced plastic(CFRP) laminates illustrate the potential of the proposed methods in the evaluation of elastic moduli of composites. Given that the exciter attached to the specimen surfaces can be replaced with some special counterparts, the proposed ESPI system has considerable potential to test the objects loaded in some extreme environments, e.g., high temperatures or underwater, where contact detection methods are difficult to be implemented.

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Optimum Image Extraction and Phase Analysis for ESPI Measurements Under Environmental Disturbance

Cited by 4 publications

References 33 publications

Precision roll angle measurement based on digital speckle pattern interferometry

Precision roll angle measurement based on digital speckle pattern interferometry

Martial Arts Routine Difficulty Action Technology VR Image Target Real-Time Extraction Simulation

Accurate determination of the elastic moduli of optimized cantilever beams by efficient time-averaged ESPI system

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