Article
Optics
Jinxin Deng, Jingping Zhu, Haoxiang Li, Xiangzhe Zhang, Fengqi Guo, Xun Hou
Summary: Polarization imaging has potential in underwater applications due to its ability to eliminate backscattered light. This study generates optimal image pairs directly from the Stokes vector, eliminating the need for background reliance or searching for brightest and darkest images, enhancing real-time imaging of moving targets. Experimental results show the effectiveness of this method for targets with different polarization properties, and the imaging distance can be increased by 30% compared to conventional models.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Yanfa Xiang, Guochen Wang, Jie Gao, Xin Wang, Yubin Chen, Khian-Hooi Chew, Rui-Pin Chen
Summary: The scattering and absorption of suspended particles in water severely degrade underwater imaging quality. This study proposes an improved dehazing method that optimizes the estimation accuracy of polarization parameters in the traditional underwater polarization imaging model. Experimental results demonstrate that the proposed method preserves image details better and achieves faster speed than the traditional underwater dehazing method, especially in high-turbidity water environments. The average speed for restoring a 1024 x 768 pixel image is about 6.2 ms.
JOURNAL OF ELECTRONIC IMAGING
(2023)
Article
Physics, Applied
Haofeng Hu, Pengfei Qi, Xiaobo Li, Zhenzhou Cheng, Tiegen Liu
Summary: This paper proposes an effective method for enhancing underwater image quality using histogram processing and polarization filter, which can simultaneously improve contrast and reduce color distortion.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Feng Zhao, Rusi Lu, Xiangning Chen, Chunqi Jin, Sai Chen, Zicheng Shen, Cheng Zhang, Yuanmu Yang
Summary: This study introduces a compact polarization imaging apparatus that uses a multifunctional planar dielectric metalens to capture two orthogonally polarized images of an underwater scene simultaneously, demonstrating large enhancement of image contrast and real-time depth estimation of target objects.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Haofeng Hu, Yilin Han, Xiaobo Li, Liubing Jiang, Li Che, Tiegen Liu, Jingsheng Zhai
Summary: This paper proposes an effective solution combining polarimetric physical model and deep neural network for suppressing scattered light and restoring target signals in underwater imaging. Experimental results demonstrate that this method improves image quality and outperforms other existing methods, even in high turbidity conditions.
Article
Optics
Huajun Zhang, Ning Zhou, Qingguo Meng, Mingyuan Ren, Hantao Wang, Yu Zhang
Summary: The study proposes a method for estimating the degree of polarization of target signal light by extracting connected domains of objects. Experimental results show that the method can successfully recognize objects with different polarization degrees and effectively extract them in turbid underwater environments.
Article
Engineering, Marine
Haoyuan Cheng, Qi Chen, Xiangwei Zeng, Haoxun Yuan, Linjie Zhang
Summary: This paper proposes a novel navigation and control method for underwater vehicles that can navigate autonomously without relying on satellites. The method is based on underwater polarization patterns, and includes an algorithm for measuring underwater course angles and the development of underwater polarization detection equipment. By combining polarization and inertial information, a strapdown navigation method is developed for a Remote Operated Vehicle (ROV). The feasibility of angle measurement based on polarization is verified in water tank experiments, and the underwater navigation accuracy is evaluated in a real underwater environment. The results show that the proposed method can effectively improve the efficiency and accuracy of ROV underwater work.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Mathematics, Interdisciplinary Applications
Jie Shen, Zhenxin Xu, Zhe Chen, Huibin Wang, Xiaotao Shi
Summary: This study introduces an optical prior-based underwater object detection approach that uses optical principles to identify optical collimation and provide valuable guidance for extracting object features in underwater environments. The method's prior is independent of training samples, integrating image prior and object detection task for improved performance in underwater settings.
Article
Chemistry, Analytical
Tianfeng Pan, Xianqiang He, Xuan Zhang, Jia Liu, Yan Bai, Fang Gong, Teng Li
Summary: This study investigates the capability of bottom-up detection of underwater targets using polarization imaging through in situ experiments and finds that the polarization angle is the optimal parameter.
Article
Engineering, Mechanical
Xing Liu, Mingjun Zhang, Feng Yao, Zhenzhong Chu
Summary: This paper proposes an improved region tracking control strategy for underwater vehicles in marine environment. The strategy incorporates a Nussbaum-type state observer to estimate the unmeasured velocity and applies a RBF neural network to approximate the unknown dynamics of the vehicle. The simulation results confirm the effectiveness of the proposed control strategy in satisfying the prescribed boundaries.
NONLINEAR DYNAMICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Shuhe Zhang, Tao Peng, Zeyu Ke, Han Yang, Tos T. J. M. Berendschot, Jinhua Zhou
Summary: In this study, the Retinex-qDPC method is proposed to improve the quality of phase recovery in the presence of mismatched background. By utilizing the edge features of images, the Retinex-qDPC models achieve high background-robustness qDPC reconstruction. The L1-Retinex-qDPC outperforms other state-of-the-art qDPC algorithms.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Optics
Minmin Wang, Xinwei Wang, Yue Zhang, Liang Sun, Pingshun Lei, Yuqing Yang, Jianan Chen, Jun He, Yan Zhou
Summary: This paper presents a method to remove water backscatter at different depths in underwater range-gated imaging by estimating scene depth, resulting in high-quality image restoration, with experimental results demonstrating its effectiveness.
Article
Chemistry, Multidisciplinary
Pedro Carvalho, Americo Pereira, Paula Viana
Summary: Advertisements are often inserted in multimedia content, particularly in TV broadcasting. Detecting channel logos is seen as a good indicator for identifying advertisement segments, but the challenging process is more difficult due to limited prior data. Proven proposals typically rely on prior knowledge or existing databases to achieve the best results.
APPLIED SCIENCES-BASEL
(2021)
Article
Optics
Xueyan Ding, Yafei Wang, Xianping Fu
Summary: This paper proposes a learning-based method for clear underwater color polarization imaging. By using multi-polarization fusion adversarial generative networks, the method learns the relationship between polarization information and object radiance. Experimental results show that the proposed method can effectively remove backscattered light and recover object radiance.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Yuanzhi Zhao, Wenjun He, Hang Ren, Yahong Li, Yuegang Fu
Summary: In this study, the traditional polarization imaging model's limitations are overcome by adding constraints, and a new method is proposed to simultaneously obtain the polarization information of the target and scattering medium. The method demonstrates high contrast and similarity to targets without scattering in underwater imaging.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Haokun Yang, Shuang Wang, Kun Liu, Junfeng Jiang, Zhiyuan Li, Xiaoshuang Dai, Xueping Li, Peng Zhang, Tiegen Liu
Summary: In this work, a high-stability polarization-based interrogation method for optical fiber interferometric acoustic sensing is proposed and demonstrated. An extrinsic Fabry-Perot interferometric (EFPI) sensor based on polyphenylene sulfide (PPS) diaphragm is used for signal detection, and a cross-correlation interrogation system is formed with a birefringent crystal based on polarization low-coherence interference technology. The system is capable of real-time acquisition of the direct current (DC) component of the interference signal, without requiring an orthogonal relationship between the interference signals and being unaffected by the drift of the sensor's initial cavity length. The proposed scheme simplifies the system configuration, and has the potential for practical engineering applications due to its low cost, strong robustness, and high-frequency properties.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Rongxiang Guo, Shujiao Zhang, Haoran Gao, Ganapathy Senthil Murugan, Tiegen Liu, Zhenzhou Cheng
Summary: Short-wavelength mid-infrared silicon photonics has been growing for applications in free-space optical communications, laser ranging, and biochemical sensing. However, grating couplers at 2-2.5 μm wavelengths still have low efficiencies due to moderated directionality and poor diffraction-field tailoring capability. In this study, a blazed subwavelength coupler was developed to improve light coupling efficiency, bandwidth, and tolerance.
PHOTONICS RESEARCH
(2023)
Article
Optics
Weicheng Chen, Dian Wan, Qi He, Jiaqi Wang, Haofeng Hu, Tiegen Liu, Hon Ki Tsang, Zhenzhou Cheng
Summary: Short-wavelength mid-infrared (MIR) silicon photonics has various applications in optical communications, chemical analysis, and environmental monitoring. In this study, a relaxed-tolerance subwavelength grating (SWG) coupler design with dual-hole structures was demonstrated to overcome fabrication variations and improve reproducibility. The relaxed-tolerance SWG coupler achieved a peak coupling efficiency of -6.2 dB at a wavelength of 2.038 μm with a 1-dB bandwidth of about 30 nm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Qi He, Senmiao Han, Weicheng Chen, Haofeng Hu, Tiegen Liu, Zhenzhou Cheng
Summary: Mid-infrared (Mid-IR) silicon photonics has gained significant attention in the development of chip-integrated molecular sensors. Microring resonators (MRRs) with high-quality factors, reproducibility in fabrication, and compact footprints are useful for sensing purposes. However, the limited availability and high cost of mid-IR equipment, such as tunable lasers or spectrometers, hinder the applications of MRR-based sensors. In this study, we propose a theoretical approach to overcome this limitation by using an MRR-based nitrogen dioxide gas sensor that utilizes a monochromatic mid-IR laser. Additionally, graphene is employed as a sensitizing medium to modify the phase of the propagating light in the silicon waveguide after gas molecule adsorption. The proposed sensor achieves a theoretical sensitivity of 1.259 x 10-5 RIU/ppm, a limit of detection of 5.1 ppm, and a detection range of 5135 ppm. This research is expected to pave the way for the development of chip-integrated, low-cost, and highly sensitive optical gas sensors.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Haofeng Hu, Shiyao Yang, Xiaobo LI, Zhenzhou Cheng, Tiegen Liu, Jingsheng Zhai
Summary: Reduced resolution of polarized images hinders the distinction of fine polarization information and the identification of small targets and weak signals. To address this problem, this paper proposes a deep convolutional neural network based polarization super-resolution reconstruction method, which is proven to outperform other methods in terms of quantitative and visual evaluation.
Article
Chemistry, Analytical
Teng Zhang, Qun Han, Zhizhuang Liang, Junfeng Jiang, Zhenzhou Cheng
Summary: This paper proposes a fiber sensor based on the Vernier effect for simultaneous measurement of relative humidity (RH) and temperature. The sensor is fabricated by coating two types of UV glue with different refractive indexes (RI) and thicknesses on a fiber patch cord. The Vernier effect is formed through the analysis of the Fast Fourier Transform (FFT) of the reflective spectrum. By calibrating the RH and temperature response of the reflective spectrum, simultaneous measurements of RH and temperature are achieved.
Article
Biochemical Research Methods
Haonan Wang, Tianhua Xu, Ziyihui Wang, Yize Liu, Huaixu Chen, Junfeng Jiang, Tiegen Liu
Summary: A liquid crystal (LC)-based optofluidic whispering gallery mode (WGM) resonator is used as a biosensor to detect biotin. The immobilized streptavidin (SA) protein specifically binds to biotin, causing a shift in the WGM spectral wavelength. The biosensor has a high detection limit and can be used for real-time monitoring of an ultrasensitive nature, opening up possibilities for other applications.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Xibo Jin, Kun Liu, Junfeng Jiang, Tianhua Xu, Zhenyang Ding, Xinxin Hu, Yuelang Huang, Dongqi Zhang, Sichen Li, Kang Xue, Tiegen Liu
Summary: This article proposes a pattern recognition approach based on STFT and Resnet 152 neural network. It preprocesses the optical signals and sends them to a CNN model for accurate pattern recognition. Experimental results demonstrate that the method achieves high recognition accuracy and fast detection time for nine sensing events.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Shuang Wang, Shikai Li, Junfeng Jiang, Tianhua Xu, Ke Tan, Xiaoshuang Dai, Zhiyuan Li, Xinyun Sun, Hongyu Liu, Tiegen Liu
Summary: A method is proposed to correct the fringe order jumps in polarization low-coherence interferometry by exploiting the dispersion compensation equation. The relationship between the deviation phase and the envelope peak of the interference fringes is established to eliminate the fringe order jump error caused by dispersion.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yize Liu, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Danni Jiao, Tianhua Xu, Xuezhi Zhang, Tiegen Liu
Summary: We propose a fiber laser temperature sensor based on temperature dependence whisper gallery mode-based microcavity. By injecting three different thermo-optic coefficient liquids into a thin-wall thickness microtubule, different temperature sensitivities of whisper gallery mode shift are achieved. The sensor temperature sensitivity increases with the absolute value of the liquid core thermo-optic coefficient. The theoretical model of whisper gallery mode temperature response is analyzed. A liquid core microtubule is inserted into the erbium-doped fiber ring laser (FRL) cavity as the optical filter and sensing unit simultaneously, enabling the use of lasing wavelength to detect the temperature change of the medium. With the combination of the liquid core to increase sensitivity and FRL cavity to increase sensing resolution, the sensing system demonstrates a high sensitivity of 112.8 pm/degrees C and a thermal resolution of 8.16 x 10(-3)degrees C.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Teng Zhang, Zhenyang Ding, Kun Liu, Haohan Guo, Peidong Hua, Sheng Li, Ming Pan, Ji Liu, Junfeng Jiang, Tiegen Liu
Summary: We demonstrate a short-time long distance distributed high-temperature sensing by non-local Haar transform (NLH) in optical frequency domain reflectometry (OFDR). With the proposed NLH method, we achieved a short-time distributed high-temperature sensing ranging from 950 degrees C to 1050 degrees C over 102 m by reduced-cladding single mode fiber (RC-SMF) with a sensing spatial resolution of 2 cm. The NLH method has a best performance to restore the consistency of spectral shift distribution caused by the same temperature change without deterioration of sensing spatial resolution compared with traditional image denoising methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Haofeng Hu, Huifeng Jin, Hedong Liu, Xiaobo Li, Zhenzhou Cheng, Tiegen Liu, Jingsheng Zhai
Summary: In this paper, a deep transfer learning-based solution for polarimetric image denoising is proposed. By fine-tuning a denoising model pre-trained on a large-scale color image dataset and using a small-scale polarimetric dataset, the proposed network achieves almost the same denoising performance as that with a large-scale dataset. The method also demonstrates good generalization ability for different materials and noise levels.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Hedong Liu, Xiaobo Li, Zhenzhou Cheng, Tiegen Liu, Jingsheng Zhai, Haofeng Hu
Summary: In this Letter, a self-supervised method called polarization to polarization (Pol2Pol) is introduced for polarimetric image denoising using only one-shot noisy images. A polarization generator is proposed to synthesize training image pairs from the one-shot noisy images by exploiting polarization relationships. The Pol2Pol method is extensible and compatible, allowing the deployment of any network that performs well in supervised image denoising tasks with proper modifications. Experimental results demonstrate that Pol2Pol outperforms other self-supervised methods and achieves comparable performance to supervised methods.
Article
Engineering, Electrical & Electronic
Hedong Liu, Xiaobo Li, Zhenzhou Cheng, Tiegen Liu, Jingsheng Zhai, Haofeng Hu
Summary: Color polarimetric imaging provides multidimensional information for object properties and has various applications. However, polarimetric images have lower SNR and are more sensitive to noise than conventional color images, leading to noisy images and degraded polarization analysis. In this article, a 3-D CNN is proposed to denoise color polarimetric images by utilizing the coherence among space, color, and polarization. Experiments show that this method effectively removes noise and restores polarization information, suggesting potential applications in multidimensional imaging tasks.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Optics
Tong Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Tianhua Xu, Panpan Niu, Jinying Ma, Jinde Yin, Tiegen Liu
Summary: This study proposes and demonstrates a disposable ultra-miniature fiber probe for simultaneously detecting low-wavenumber and high-wavenumber Raman scattering spectra of deuterated compounds. The fiber probe shows high resolution and quantitative determination capability, and allows for simultaneous excitation and characterization of chemical vibration modes in the low-wavenumber and high-wavenumber regions.
