Simultaneous estimation of multiple phases in digital holographic interferometry using state space analysis

Machine condition monitoring has gained momentum over the years and becoming an essential component in the today’s industrial units. A cost-effective machine condition monitoring system is need of the hour for predictive maintenance. The paper presents the design and implementation using vibration sensor, and also this system operated through smartphones. Vibration analysis plays a major role in detecting machine defects and developing flaws before the equipment fails and potentially damages. The concept of this project was to detect faulty equipment in industry machine so that before damaging the whole machine faulty equipment can be replace and improve the durability of machine.

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“…Vibration that causes no damage is likewise highly helpful [6]. Simultaneous multidimensional measurements are feasible [7].…”

Section: Figure 1 Basic Circuit Connectionmentioning

confidence: 99%

Laser Based Vibration Sensor Through Mobile

Mahapatra¹,

Yadav²,

Yadav³

2023

Int.J.Appl.Sci.Smart Technol.

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“…Optical NDT techniques have such advantages as real-time inspection, whole-field test, non-contact measurement, and high-sensitivity [7], and have been widely used in deformation measurement. The optical NDT mainly includes holographic interferometry (HI) [8], digital speckle pattern interferometry (DSPI) [9], [10], digital image correlation (DIC) [11], etc. Unfortunately, the difficulty in obtaining high quality speckle patterns blocks the application of optical NDT technology to biomaterial detection.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

Zhong

Tang

et al. 2019

IEEE Access

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In order to detect the deformation and strain of materials accurately, the key is to obtain the phase information caused by dynamic loading in digital speckle pattern interferometry (DSPI). In this paper, the evaluation method of quality of the speckle pattern in DSPI system is proposed, and the influence of the size of speckle grain on the stability and contrast of speckle pattern is discussed. And then, the strain detection experiments of inactive and bioactive materials are provided with different aperture slit size under the same detection conditions. The size of speckle grain has an important influence on the quality of speckle pattern. For strain detection of inactive materials, using the small size of speckles can obtain higher quality speckle pattern under the condition of satisfying the Nyquist theorem and spectral separation. For active biomaterials, non-structural factors easily induce the instability of speckle pattern, which leads to the decorrelation of between pre-deformation and post-deformation speckle pattern. So the compromise between the stability and the information capacity of speckle images should be considered in the selection of speckle size. Experiments show that the optimum size of speckles used for strain detection active biomaterials is larger than that of inactive biomaterials under the same conditions in the same DSPI system.

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“…Otherwise, the mismatch between the theoretical model and the practical experimental setup could deteriorate the imaging quality. For instance, a well-known problem of ptychography imaging is the accurate knowledge of the probe positions [1][2][3][4][5][6][7],…”

Section: Introductionmentioning

confidence: 99%

Enhanced multi-rotation computational coherent imaging based on pre-illumination and simulated annealing compensation

Geng

Guo

Zhou

et al. 2019

J. Opt.

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Multi-rotation computational coherent imaging (MRCI) system has been proposed, in which a custom-built degree calculation method based on Radon transform is specifically designed. However, both coaxial misalignment in rotation and the low robustness of angle calculation limited by sample-diversity degrade the quality of reconstruction. We propose an enhanced MRCI (eMRCI), which combines pre-illumination detection and simulated annealing (SA) compensation. In eMRCI, the pre-illumination mode thoroughly solves the low robustness of angle calculation and simultaneously captures the number of transverse off-axis deviation pixels. For the potential and slight hysteresis error, it is compensated by the SA algorithm. Both simulation and experimental results demonstrate that robust shift correction and angle calculation are achievable. This framework mitigates hardware requirements, and provides a possible new path for position error correction of array-illumination or scanning imaging.

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Simultaneous estimation of multiple phases in digital holographic interferometry using state space analysis

Cited by 10 publications

References 29 publications

Laser Based Vibration Sensor Through Mobile

Laser Based Vibration Sensor Through Mobile

Effect of the Speckle Size on the Quality of Speckle Pattern in DSPI System

Enhanced multi-rotation computational coherent imaging based on pre-illumination and simulated annealing compensation

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