Showing papers in "Optics and Lasers in Engineering in 2022"

TL;DR: The proposed NCCS system has larger key space and exhibits better cryptographic features in dynamics than their original one-dimensional chaotic map, and the validity of the proposed algorithm in terms of high security is shown.

TL;DR: In this article , a color image encryption scheme is presented by combining the multi-parameter fractional discrete Tchebyshev moments (MPFrDTMs) with the nonlinear fractal permutation method.

TL;DR: Wang et al. as discussed by the authors proposed a new combination chaotic system (NCCS) for image encryption, which has larger key space and exhibits better cryptographic features in dynamics than their original one-dimensional chaotic map.

TL;DR: In this article , a detailed comparative study is conducted for the two-frequency phase-shifting method including hierarchical, number-theoretical and heterodyne approaches and the Gray-coded-based method including traditional Gray code approach, complementary gray code approach and Gray code with tripartite phase unwrapping (Tri-PU).

TL;DR: In this paper , a modified laser scanning technique is proposed and experimentally demonstrated in the WMS-based TDLAS gas sensor, achieving about 3 ppm minimum detection limit and 9.6 ppm measurement accuracy.

TL;DR: Glare is a free and open-source software for generation and assessment of digital speckle pattern that realizes real-time deformed image rendering with the aid of fast initial value estimation algorithm for backward mapping and pattern pre-rendering technique, and improves the computational efficiency of sum of square of subset intensity gradients by integral image method.

TL;DR: Wang et al. as mentioned in this paper proposed a deep-learning-based infrared-visible images fusion method based on encoder-decoder architecture, which can provide diverse imaging modalities and achieve superior performance in visual effects and objective assessments.

TL;DR: The wavefront of the OAM beams is helical, the intensity at the center of the beam is zero, and there is a phase singularity as mentioned in this paper , which is a characteristic of OAM beam.

TL;DR: In this paper , a depth-resolved tomography approach called laser induced chirp-pulsed radar photothermal tomography (CR-PT) is introduced, and it is employed for the 3D visualization detection for carbon fiber reinforced polymer (CFRP).

TL;DR: In this paper, a depth-resolved tomography approach called laser induced chirp-pulsed radar photothermal tomography (CR-PT) is introduced, and it is employed for the 3D visualization detection for carbon fiber reinforced polymer (CFRP).

TL;DR: In this paper, a single-fiber photoacoustic (PA) sensor was designed and proposed for the detection of trace amount of methane gas, which was used to monitor the PA signal generated by the methane gas having absorbed the laser energy.

TL;DR: Wang et al. as mentioned in this paper presented Glare, a free and open-source software for generation and assessment of digital speckle pattern, which can generate ellipse, polygon, and Gaussian speckles, render deformed images, assess pattern quality, and present pattern recommendations.

TL;DR: In this paper, the authors proposed a new method that can obtain the degree of linear polarization of the target and scattering medium simultaneously, and conduct a polarization descattering imaging experiment through turbid water.

TL;DR: The findings on the measurement accuracy of each sensor under “ideal” situations are presented, and software APIs and user instructions that are available for the community to easily use each of the evaluated commercially available 3D optical sensor are developed.

TL;DR: This paper presents a scheme for reconstructing the 3D surfaces of transparent objects based on a combination of stereo matching and laser scanning, and improves the matching accuracy and point cloud density through an internal pixel matching method.

TL;DR: In this paper , the specific action mechanism of three laser methods: laser dry cleaning, liquid-assisted laser cleaning, and laser shock wave cleaning is discussed, which provides essential engineering practical value for clarifying the multi-action mechanism between laser and the cleaned object and establishing the cleaning process database.

TL;DR: In this paper, the authors demonstrate a lensless QPI using holographic methods derived from the coherence theory, including off-axis holography, phase-shifting and polarization-based phase shifting holographic techniques.

TL;DR: This review comprehensively overviews the advances made to mirror-assisted multiple-view digital image correlation and encourages its future applications in experimental mechanics.

TL;DR: In this paper , the authors proposed a new method that can obtain the degree of linear polarization of the target and scattering medium simultaneously, and conduct a polarization descattering imaging experiment through turbid water.

TL;DR: In this paper , a bi-material sample composed of aggregate and mortar in the same volume and shape is designed for convenience to conduct tensile experiments using the proposed SEM-DIC method.

TL;DR: Mirror-assisted multiple-view digital image correlation (MV-DIC) is a recently developed variant of DIC technique for panoramic or dual-surface shape, motion and deformation measurements as discussed by the authors .

TL;DR: Zhang et al. as mentioned in this paper proposed a learning-based method that uses multi-polarization fusion adversarial generative networks to learn the relationship between polarization information and object radiance.

TL;DR: In this article , the authors demonstrate a lensless QPI using holographic methods derived from the coherence theory, including off-axis holography, phase-shifting and polarization-based phase shifting holographic techniques.

TL;DR: In this article, the authors analyzed the link between powder catchment efficiency and the deposition height stability and showed that the track height stabilization is associated with a reduction of the powder catchments efficiency, which is governed by the melt pool relative position with respect to the powder cone and the laser beam.

TL;DR: Wang et al. as discussed by the authors presented a scheme for reconstructing the 3D surfaces of transparent objects based on a combination of stereo matching and laser scanning, where the laser lines reflected from the front surface of the target are then reconstructed using stereo vision.

TL;DR: A simple, single-exposure HT system that allows to record a full set of projections multiplexed in a single hologram and works with a robust tomographic reconstruction algorithm to provide satisfactory quality of the 3D RI distribution.

TL;DR: In this article , the authors analyzed the link between powder catchment efficiency and the deposition height stability and showed that the track height stabilization is associated with a reduction of the powder catchments efficiency, which is governed by the melt pool relative position with respect to the powder cone and the laser beam.

TL;DR: An infrared and visible image fusion method based on an iterative differential thermal information filter to generate a fusion image with the salient thermal targets of the infrared image and detailed information of the visible image is proposed.

TL;DR: In this paper, the authors reviewed the research progress of optical techniques developed for the measurement of mechanical properties of materials and devices at micro and nano-scale, with the aim to clarify the measurement principles and applications of optical methods in small scale, consisting of the experimental equipment, clamping and loading, deformation carriers or marks, optical methods including the holography, speckle and moire, and finally to outline the perspectives in this fast-evolving field.