Article
Optics
Naicheng Quana, Siyuan Lia, Chunmin Zhang
Summary: This paper presents the modified achromatic Savart Polariscope for constructing a broadband spatially modulated snapshot imaging polarimeter. The modified achromatic Savart Polariscope can be made from two different birefringent crystals. The achievements and performances of the modified achromatic Savart Polariscope are demonstrated with numerical simulations. The chromatic variations in spatial carrier frequencies can be reduced by an order of magnitude. The spatially modulated snapshot imaging polarimeter constructed by the modified achromatic Savart Polariscopes can achieve root mean square errors with a magnitude of 10 - 4 across the spectral range 0.48-0.96 ism as it does in monochromatic light conditions.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zhilong Xu, Jianwen Meng, Man Zhao, Ting Yang, Dan Wu, Rui Zhang, Yingge Xie, Wenyi Ren
Summary: The advantage of polarization is that it can provide contrast of an object and extend scene information compared to conventional intensity images. This paper presents a full-Stokes imaging polarimeter based on compressive sensing, which effectively improves the quality of image reconstruction by optimizing the measurement matrix.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Jinfeng Tang, Chengling Jia, Jin Zhang, Ming Jiang, Yangliu Pan, Siyue Jiang, Baoqing Hu, Qizhui Cao, Mingwu Jin
Summary: This paper proposes a calibration technique based on phase-shift interference theory to accurately extract and demodulate the modulation phase factors of a spatially modulated system. The feasibility of this technique is demonstrated through numerical simulation and laboratory experiments. This work provides a different perspective for the calibration of a spatially modulated snapshot imaging polarimeter.
Article
Engineering, Electrical & Electronic
Kuigui Liu, Xin Ding, Yang Li, Xuejing Liu, Qian Xiao
Summary: This paper proposes a parallel-fiber-loop interferometer based on Vernier effect for strain and temperature detection. The interference is generated between the outputs of two parallel fiber Sagnac interferometers. The feasibility of the system is proved theoretically and experimentally. The device has the advantages of simple structure, low cost, high sensitivity, and good stability, and has a promising application prospect in strain and temperature measurement.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Qizhi Cao, Min Jiang, Chenling Jia, Siyue Jiang, Jing Zhang, Baoli Yao, Mingwu Jin, Edward Dehoog, Lian Duan, Huahua Wang, Ting Deng, Dongxin Fan
Summary: We introduce a snapshot imaging Mueller matrix polarimeter using modified Savart polariscopes (MSP-SIMMP). The instrument includes both polarizing optics and analyzing optics, encoding all Mueller matrix components of the sample into interferogram using spatial modulation technique. We discuss an interference model, as well as reconstruction and calibration methods. Numerical simulation and laboratory experiment demonstrate the feasibility of MSP-SIMMP. The remarkable advantage of this instrument is its easy calibration, compactness, snapshot-enablement, and lack of moving parts compared to conventional imaging Mueller matrix polarimeters with rotating parts.
Article
Optics
Jun Chen, Xiaotian Li, Jiri Jirigalantu, Fuguan Li, Qihang Chu, Yuqi Sun, Heshig Bayan
Summary: This paper presents a Stokes white-light channeled imaging polarimeter using Savart plates and a polarization Sagnac interferometer (IPSPPSI), which effectively solves the problem of channel aliasing in broadband polarimeters. The paper derives the expression for the light intensity distribution and a method to reconstruct polarization information, and provides an example design for an IPSPPSI. The results show that a complete measurement of the Stokes parameters in broad band can be achieved with a snapshot on a single detector. The use of dispersive elements like gratings suppresses broadband carrier frequency dispersion so the channels in the frequency domain do not affect each other, ensuring the integrity of information coupled across the channels. Furthermore, the IPSPPSI has a compact structure and does not employ moving parts or require image registration. It shows great application potential in remote sensing, biological detection, and other fields.
Article
Energy & Fuels
Zhiheng Liu, Yongqing Wang, Jiuxi Cheng, Peijie Han, Zhibin Liu, Zhaoyan Zhang, Xiaoguang Li, Jianquan Yao
Summary: In order to solve the problem of external environmental noise interference in the dual Mach Zehnder (M-Z) interferometer system, a data signal-processing scheme based on Hilbert-Huang transform (HHT) is proposed to achieve accurate location with distributed optical fibers. By obtaining the eigenmode function through empirical mode decomposition, and then obtaining the Hilbert spectrum by superimposing the Hilbert transform, the high-similarity curve caused by vibration signal can be clearly extracted. The vibration position information can be accurately obtained by calculating the optical signal information based on the cross-correlation and delay estimation algorithm. Experimental results show that the positioning accuracy can reach +/- 11 m, which proves the high practical application value of the distributed optical fiber sensing technology based on the dual Sagnac interferometer system.
Review
Optics
Amalia Miliou
Summary: This article provides an extensive overview of various types of in-fiber interferometric-based sensors and their technologies, showcasing their capability to make highly accurate measurements on various physical or chemical quantities. The comparison and selection of the most suitable sensor for a specific application is made easier through the introduction of basic configurations, brief operating principles, and recent applications for each interferometric architecture.
Article
Optics
Sara Pena-Gutierrez, Santiago Royo
Summary: This article aims to provide experimental insights and analyze the best polarimetric calibration method for a division of aperture polarimetric imager considering its implications on the experimental set-up and performance. The calibration methods are introduced, intermediate results are presented, and the ability of the set-up to estimate polarization information is evaluated. Accuracy errors below 10% are achieved for all polarization modes when using the Data Reduction Matrix or the Eigenvalue Calibration Method, but degrade significantly with the Polarizer Calibration Method. This is the first detailed comparison of calibration methods in the literature and the first application of the Polarizer Calibration Method to a division of aperture polarimeter.
Article
Engineering, Electrical & Electronic
Yundong Liu, Hailiang Chen, Qiang Chen, Baocheng Li, Shuguang Li
Summary: A sensitivity-amplifying optical fiber sensor using cascaded Sagnac interferometers (CSIs) was designed and experimentally demonstrated for the dual-parameter measurement of strain and temperature, showing an increased sensitivity by more than 10 times compared to a single SI.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Tonglei Cheng, Bin Li, Fan Zhang, Wei Liu, Xiaoyu Chen, Yuanhongliu Gao, Xin Yan, Xuenan Zhang, Fang Wang, Takenobu Suzuki, Yasutake Ohishi
Summary: A fiber twist angle sensor based on a self-made eccentric dual-core fiber and a Sagnac loop interferometer has been proposed and verified experimentally. The sensor can accurately measure the twist angle and identify its direction, showing good sensitivity, stability, and repeatability.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Electrical & Electronic
Yuhan Hu, Yongchao Chen, Qiuheng Song, Pengwei Zhou, Limou Shen, Hekuo Peng, Qian Xiao, Bo Jia
Summary: This paper proposes a novel dual Sagnac distributed fiber vibration sensor for disturbance localization, which can achieve high precision with the help of time delay estimation based on cross-correlation. The system has equal optical path lengths design to avoid time error problem, resulting in high localization precision. It has potential applications in long-distance perimeter security and other fields.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Yaoli Wang, Rui Zhang, Zhibin Wang, Peng Xue, Min Cui, Mengwei Li
Summary: In this study, a double-channel complementary microarray coding method was proposed for snapshot-type polarization spectral imaging, which utilizes the transmission and reflection complementary principle of a single microarray coding plate. The dual-channel multispectral and hyperspectral image fusion technique was applied to enhance the resolution of polarization spectral imaging.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Multidisciplinary
Cao Qi-Zhi, Tang Jin-Feng, Pan Yang-Liu, Jiang Min, Jiang Si-Yue, Zhang Jing, Jia Chen-Ling, Fan Dong-Xin, Deng Ting, Wang Hua-Hua, Duan Lian
Summary: This paper proposes a dynamic calibration method for linear shear spatial modulation snapshot imaging suitable for dynamic environments, and successfully validates it through experiments. This method does not require a reference target and can perform target detection and system calibration simultaneously.
ACTA PHYSICA SINICA
(2022)
