Abstract
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 de-correlation 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.
Highlights
The strain detection of bioactive materials is becoming more and more important
In order to better analyze the influence of speckle size on system performance, we propose the concept of speckle-pixel size ratio, and use the sampling theorem to analyze the constraints of speckle size in digital speckle pattern interferometry (DSPI)
Through the above research, it can be seen that the optimal speckle size in DSPI is different when it is applied to different detection objects
Summary
The strain detection of bioactive materials is becoming more and more important. For example, in the process of prosthetic limb design and replacement, there are various challenges in improving prosthetic devices for patients with lower limb amputation and total joint replacement. Ping achieved the strain measurement of the bone active surface by introducing phosphate buffer saline medium imaging environment to reduce the influence of wet surface [31] These methods can restrain the de-correlation of speckle patterns caused by the activity of the detected object to a certain extent, they are still not of universal significance. The comparative experiments of strain detection of inactive materials and active biomaterials have proved the influence of speckle size on the quality of speckle patterns acquired by different detection objects in design of DSPI system. THE SCHEMATIC OF THE EXPERIMENTAL SETUP FOR SPECKLE IMAGE ACQUISITION In this paper, we take the metal aluminium plate and fresh bones as the research object and design a DSPI detection system based on spatial phase shift technology to explore the influence of the size of speckles on the quality of speckle patterns. In the designed DSPI, the amplification factor of the optical system equal to 0.1207
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