2021
2021
-
Record 313 of
Title:Analysis of a wavelength-tunable D-shaped photonic crystal fiber filter with broad bandwidth
Author(s):Meng, Xiaojian(1); Li, Jianshe(1,2,3); Guo, Ying(1); Du, Huijing(1); Liu, Yundong(1); Li, Shuguang(1); Guo, Haitao(2); Bi, Weihong(3)Source: Journal of the Optical Society of America B: Optical Physics Volume: 38 Issue: 5 DOI: 10.1364/JOSAB.421792 Published: May 2021Abstract:This paper has designed a D-shaped photonic crystal fiber filter based on surface plasmon resonance. The singlepolarization filtering performance is analyzed systematically by the finite element method. It is found that the structural optimization process will modify the refractive index of the fundamental mode and the surface plasmon polarization mode, which results in a shift of the resonance wavelength. The proposed filter is able to indicate the wavelength-tunable function in the ranges of 1250-1350 nm and 1550-1750 nm by two methods.Moreover, at the communication windows of 1310 nm and 1550 nm, the corresponding filtering bandwidths are 170 and 550 nm, respectively. The flow chart of filter preparation reported in the study is promising for use in the field of optical devices. ? 2021 Optical Society of America.Accession Number: 20212010346833 -
Record 314 of
Title:Perfect Soliton Crystals in the High-Q Microrod Resonator
Author(s):Niu, Rui(1,3); Wan, Shuai(1,3); Wang, Zheng-Yu(1,3); Li, Jin(1,3); Wang, Wei-Qiang(2,4); Zhang, Wen-Fu(2,4); Guo, Guang-Can(1,3); Zou, Chang-Ling(1,3); Dong, Chun-Hua(1,3)Source: IEEE Photonics Technology Letters Volume: 33 Issue: 15 DOI: 10.1109/LPT.2021.3096645 Published: August 1, 2021Abstract:The coherent temporal soliton in optical microresonators has attracted great attention recently. Here, we have fabricated the microrod resonator with Q factor as high as 2 × 108 and demonstrated the dissipative Kerr soliton generation in such a microresonator, by utilizing an auxiliary-laser-assisted thermal response control. In addition, we have changed the pump laser and observed the perfect soliton crystals. With the simulation, we found that the perfect soliton crystals are generated based on the avoided mode crossing, which is affected by the pump resonance and pump power. ? 1989-2012 IEEE.Accession Number: 20213010675818 -
Record 315 of
Title:A compact bionic compound eye camera for imaging in a large field of view
Author(s):Wang, Yuanyuan(1); Shi, Chengyong(3); Xu, Huangrong(2); Zhang, Yuanjie(2); Yu, Weixing(2)Source: Optics and Laser Technology Volume: 135 Issue: DOI: 10.1016/j.optlastec.2020.106705 Published: March 2021Abstract:The traditional imaging technologies, such as two-dimensional imaging, have not been able to meet people's needs for higher technology. Inspired by the characteristics, such as small size, sensitivity to moving targets and large field of view, researchers began to study bionic compound eyes. In this paper, a hemispherical mounting surface with through holes to set the compound lens array is fabricated by 3-D printing technology. More than one hundred small lenses are mounted on the 3-D printed hemispherical surface to form a bionic curved compound eye, which is then integrated with an optical relay system and an CMOS imaging sensor to form a rather compact bionic compound eye camera. The addition of the optical relay system solves the problem that the mismatch between the curved focal plane formed by the curved compound eye and the flat focal plane of the CMOS imaging sensor. By employing this method, we design and analyze the curved lens array and optical relay system, and perform the related optical performance tests on the fabricated bionic curved compound eye imaging system. The results show that a good image quality can be achieved. The formed bionic compound eye imaging prototype system rather compact and has a weight of only 121 g, a volume of 34 mm × 44 mm × 80 mm, and a field of view of 120° × 120°. This system has great potential and value in military, medical, and engineering applications. ? 2020 Elsevier LtdAccession Number: 20204609496783 -
Record 316 of
Title:Differential Fresnel Reflection Based Fiber-optic Relative Humidity Sensor
Author(s):Feng, Yifei(1); Xu, Wei(2,3); Yu, Cheungchuen(4); Li, Jing(5); He, Ying(1); Sun, Wenye(6)Source: 2021 19th International Conference on Optical Communications and Networks, ICOCN 2021 Volume: Issue: DOI: 10.1109/ICOCN53177.2021.9563701 Published: 2021Abstract:Simple fiber-optic differential Fresnel reflection based relative humidity sensor with large dynamic range on is proposed and investigated. The response rate and the stability of the sensor are also addressed. ? 2021 IEEE.Accession Number: 20221111776822 -
Record 317 of
Title:Optical coherence tomography-surveilled laser ablation using multifunctional catheter and 355-nm optical pulses
Author(s):Kang, Jiqiang(1); Zhu, Rui(2,3); Li, Jianan(3,4); Liu, Haiping(3); Ma, Xiuquan(5); Tao, Ling(6); Sun, Yunxu(1)Source: Optics Communications Volume: 501 Issue: DOI: 10.1016/j.optcom.2021.127364 Published: December 15, 2021Abstract:An optical coherence tomography (OCT)-monitored laser ablation system is presented in this study. The laser ablation subsystem is constructed using the third harmonic output of a Nd:YAG laser source operating at a 355-nm optical wavelength with a single pulse energy greater than 160 mJ and a 1–10 Hz tunable repetition rate. The imaging subsystem is a typical M-mode swept-source OCT system. Moreover, a type of all-fiber multifunctional integrated catheter is demonstrated. The ablation catheter consists of a fiber bundle including 41 multi-mode fibers with an outer diameter of 0.9 mm. A forward-viewing OCT imaging probe is inserted into the ablation catheter for M-mode imaging. The performance of the system is demonstrated by OCT surveillance of the laser ablation process using expanded polystyrene foam as the sample. The OCT system can be used to record the ablation process and simultaneously count the laser ablation duration. This study proposes an effective potential technique to surveil material laser ablation processes, especially in situations where bulky optics are prohibited and all-fiber devices are required. ? 2021 Elsevier B.V.Accession Number: 20213510833159 -
Record 318 of
Title:Design of off-axis compact optical system with large relative aperture and large field of view
Author(s):Ren, Zhiguang(1,2); Li, Xuyang(1); Wang, Wei(1); Yao, Rui(1,2); Ma, Zixuan(1,2); Chu, Nanqing(1,2)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12070 Issue: DOI: 10.1117/12.2604049 Published: 2021Abstract:In order to deal with the threat of space debris to space experiment platforms and equipment, three-mirror anastigmatic system, which has the characteristics of light weight, small size and good optical performance, are used for space debris detection and detailed imaging. With the development of freeform surfaces, this article shows a new type of structure which has good optical performance and simple complexity of assembly and adjustment. The first step is to analyze the calculation method of the initial structure parameters of TMA system, and then the secondary mirror adopts the XY polynomial freeform surface. The primary mirror is reused as tertiary mirror, and the design of a new type TMA system is finally completed. Its effective focal length is 400 mm, the field of view (FOV) is 2°×4°, F/# is 5. At the Nyquist frequency 108lp/mm, the MTF value of this system is greater than 0.588. The maximum distortion is less than 0.80%. The results show that the imaging quality of the system meets the design requirements in the effective field of view. ? 2021 SPIEAccession Number: 20220811682279 -
Record 319 of
Title:Unobtrusive Sleep-Wake Discrimination Based on Arched Carbon Fiber Structure Aided Highly Sensitive under Mattress MZI-BCG Sensor and SVM
Author(s):Xu, Wei(1,2); Han, Shuying(3,9); Sun, Wenye(4); Dong, Bo(5); Yu, Changyuan(6,7); Zhao, Wei(1,2,8); Wang, Yishan(1,2,8)Source: 2021 Opto-Electronics and Communications Conference, OECC 2021 Volume: Issue: DOI: null Published: 2021Abstract:A compact arched carbon fiber structure aided fiber Mach-Zehnder interferometer (MZI) ballistocardiogram (BCG) sensor is designed and presented, which is used to realize unobtrusive sleep-wake discrimination combining cardiopulmonary coupling (CPC) and support vector machine (SVM) algorithm with high sensitivity and accuracy. ? 2021 The Author(s) OCIS codes: 280.1415, 120.7280, 120.3180Accession Number: 20224012832500 -
Record 320 of
Title:Classification of Common Urinary Pathogens Based on Hyperspectral Microscope Imaging
Author(s):Tao, Chenglong(1,2); Du, Jian(1); Wang, Quan(1,3); Hu, Bingliang(1,3); Zhang, Zhoufeng(1,3)Source: Proceedings of 2021 IEEE 2nd International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021 Volume: Issue: DOI: 10.1109/ICIBA52610.2021.9687907 Published: 2021Abstract:All the time, common pathogens in urine have been threatening human health even lives. Though Chromogenic plates is able to detect urinary bacteria, another technique and material need to be introduced for coloration. However, this kind of technique and material is not always specific. Therefore, how to rapidly detect and classify these bacteria is a tricky challenge waiting to be overcome. For solving this problem, we use hyperspectral imaging (HSI) and random forest (RF) to classify four strains of common pathogens in the urinary, which include E.faeca, K.pneum, S.aureu, and S.pneum. HSI is able to obtain spatial and hyperspectral information of the object. RF boosts classifying accuracy by combining many decision trees. Utilizing HSI and RF, we find that these bacteria can be separated well at the cellular level. ? 2021 IEEE.Accession Number: 20221311844089 -
Record 321 of
Title:Unobtrusive sleep-wake discrimination based on arched carbon fiber structure aided highly sensitive under mattress MZI-BCG sensor and SVM
Author(s):Xu, Wei(1,2); Han, Shuying(3,9); Sun, Wenye(4); Dong, Bo(5); Yu, Changyuan(6,7); Zhao, Wei(1,2,8); Wang, Yishan(1,2,8)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: null Published: 2021Abstract:A compact arched carbon fiber structure aided fiber Mach-Zehnder interferometer (MZI) ballistocardiogram (BCG) sensor is designed and presented, which is used to realize unobtrusive sleep-wake discrimination combining cardiopulmonary coupling (CPC) and support vector machine (SVM) algorithm with high sensitivity and accuracy. ? OSA 2021, ? 2021 The Author(s)Accession Number: 20214811222114 -
Record 322 of
Title:Design of hybrid refractive-diffractive star sensor optical system with wide field and small F-number
Author(s):Ma, Zehua(1,2); Wang, Hu(1,2); Shen, Yang(1,2); Xue, Yaoke(1,2); Yan, Haoyu(1,2)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12069 Issue: DOI: 10.1117/12.2606601 Published: 2021Abstract:In order to improve the measurement accuracy and detection ability of the star sensor, this paper uses a double Gauss structure with conic aspheric surface and hybrid refractive-diffractive to design an optical system with large field of view of 25°and large relative aperture of 1/1.156, and only 6 lenses are used. First, According to the selected CMOS APS sensor performance parameters, the entrance pupil diameter, field of view, focal length and wavelength range are determined. The field of view is 25°, F number is 1.156, focal length is 52mm, entrance pupil diameter is 45mm, the wavelength range is 500-800nm. The detection of 6 magnitude stars is realized, the probability of capturing 5 navigation stars is 100%, and autonomous navigation recognition is realized. Then, the glass material selection and structure optimization of the optical system are conducted, the optical system is optimized by introducing two conic aspheric surfaces and a diffractive surface. Finally, the influence of the diffraction efficiency of the diffractive optical element on the signal-To-noise ratio is analyzed. After analysis of image quality, the shape of diffuse spot in each field of view is approximately circular, the energy is close to Gaussian distribution, more than 90% of the energy is concentrated in 3×3 pixels, lateral color is less than 1.06μm, and relative distortion is less than 0.87%. The optical system only uses six lenses, the imaging quality meets the imaging requirements of the star sensor, and is beneficial to improve the accuracy and detection capability of the star sensor. ? COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.Accession Number: 20220211444599 -
Record 323 of
Title:Bidirectional Interaction Network for Person Re-Identification
Author(s):Chen, Xiumei(1); Zheng, Xiangtao(1); Lu, Xiaoqiang(1)Source: IEEE Transactions on Image Processing Volume: 30 Issue: DOI: 10.1109/TIP.2021.3049943 Published: 2021Abstract:Person re-identification (ReID) task aims to retrieve the same person across multiple spatially disjoint camera views. Due to huge image changes caused by various factors such as posture variation and illumination transformation, images of different persons may share the more similar appearances than images of the same one. Learning discriminative representations to distinguish details of different persons is significant for person ReID. Many existing methods learn discriminative representations resorting to a human body part location branch which requires cumbersome expert human annotations or complex network designs. In this article, a novel bidirectional interaction network is proposed to explore discriminative representations for person ReID without any human body part detection. The proposed method regards multiple convolutional features as responses to various body part properties and exploits the inter-layer interaction to mine discriminative representations for person identities. Firstly, an inter-layer bilinear pooling strategy is proposed to feasibly exploit the pairwise feature relations between two convolution layers. Secondly, to explore interaction of multiple layers, an effective bidirectional integration strategy consisting of two different multi-layer interaction processes is designed to aggregate bilinear pooling interaction of multiple convolution layers. The interaction of multiple layers is implemented in a layer-by-layer nesting policy to ensure the two interaction processes are different and complementary. Extensive experiments validate the superiority of the proposed method on four popular person ReID datasets including Market-1501, DukeMTMC-ReID, CUHK03-NP and MSMT17. Specifically, the proposed method achieves a rank-1 accuracy of 95.1% and 88.2% on Market-1501 and DukeMTMC-ReID, respectively. ? 1992-2012 IEEE.Accession Number: 20210409805908 -
Record 324 of
Title:Beat-to-beat heart rate estimation from MZI-BCG signal based on hierarchical clustering
Author(s):Zeng, Huaili(1); Xu, Wei(2,3); Dong, Bo(4); Yu, Changyuan(6,7); Zhao, Wei(2,3,5); Wang, Yishan(2,3,5); Sun, Wenye(8)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: null Published: 2021Abstract:An algorithm is proposed in this paper to estimate the beat-to-beat heart rate based on BCG signal derived from Mach-Zehnder Interferometer with hierarchical clustering and matched-filtering. ? OSA 2021, ? 2021 The Author(s)Accession Number: 20214811222112