Article
Engineering, Electrical & Electronic
Lara Diaz-Garcia, Andrew Reid, Joseph C. Jackson-Camargo, James F. C. Windmill
Summary: Bio-inspiration is the process of drawing insights from nature to address engineering problems. In this study, the researchers focused on directional acoustic sensing at small scales and developed a computer model based on a nocturnal moth's ear, which was then 3-D printed and experimentally tested.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Jiabin Wang, Xingyu Yang, Anzhi Wang, Hang Jiang, Linbin Bai, Haoran Meng, Song Li, Tao Geng, Weimin Sun
Summary: The study introduces a WI-FAS fiber attitude sensor for simultaneous measurement of pitching and rolling angles, utilizing a photopolymerized whisker and pendulum. Mathematical expressions and mechanical simulations are used to analyze sensitivity and primary factors, demonstrating the sensor's advantage in continuous monitoring of pitching and rolling.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Acoustics
Weidong Wang, Xiangshui Li, Zhiqiang Liu, Wentao Shi, Hui Li
Summary: This paper addresses the problem of direction-of-arrival (DOA) estimation under fluctuating misorientation in an acoustic vector sensor array (AVSA). A covariance matrix focusing fitting (CMFF) method is proposed to handle this issue. The proposed method incorporates a fluctuation parameter into different time segments to create a new AVSA data model. The deteriorated DOA estimation performance under fluctuating misorientation is mitigated by formulating a covariance matrix focusing technique. An iterative weighted covariance matrix fitting method is presented to achieve more accurate DOA estimation performance. Simulation and experimental results demonstrate the superiority and robustness of the proposed method in the case of fluctuating misorientation for an AVSA.
Article
Engineering, Aerospace
Jin He, Linna Li, Ting Shu
Summary: The article introduces a new type of acoustic sensor array, SNSAVA, to address the problem of direction finding in underdetermined scenarios. By extending the spacing between sensors and sensor components, the effective array aperture is increased, resulting in improved estimation accuracy. Performance studies comparing SNSAVA with other nested acoustic sensor arrays and the Cramer-Rao bound are provided to demonstrate its effectiveness.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Nanoscience & Nanotechnology
Shaoshuai He, Bingyan Guo, Xia Sun, Mingyue Shi, Hong Zhang, Fanglian Yao, Hong Sun, Junjie Li
Summary: Inspired by barnacle proteins, MXene/PHMP hydrogels with strong and repeatable underwater adhesion have been developed in this study. The hydrogels exhibit excellent mechanical properties, high conductivity, and functions as strain and pressure sensors. The potential of hydrogel-based sensors in underwater applications has been demonstrated.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Weidong Wang, Qunfei Zhang, Weijie Tan, Wentao Shi, Feifei Pang
Summary: This paper proposes a novel method for DOA estimation using an AVS array to reduce estimation bias caused by non-orthogonal factors. It is found that the influence of non-orthogonal factors on DOA estimation performance depends on the selection of the reference sensor. By jointly estimating the DOA of the acoustic source and the non-orthogonal deviation matrix, better DOA estimation performance is achieved.
DIGITAL SIGNAL PROCESSING
(2021)
Article
Multidisciplinary Sciences
Muhtasim Ul Karim Sadaf, Najam U. Sakib, Andrew Pannone, Harikrishnan Ravichandran, Saptarshi Das
Summary: The researchers have developed an artificial visuotactile neuron that can emulate the features of multisensory integration and encode visual-tactile information into digital spiking events. This study is of great importance in advancing the field of neuromorphic computing.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Ting Shu, Jin He
Summary: This paper proposes an elevation-azimuth direction finding algorithm using a pair of identically oriented acoustic vector sensors that can be deployed at unknown locations. By defining two fourth-order cumulant (FOC) matrices with translational invariance property, the coarray steering vectors of the sensors can be recovered in closed-form. The identifiability performance of the algorithm is investigated, and it is shown that up to 9 sources can be uniquely identified. The algorithm is also extended to accommodate AVS arrays with unknown sensor locations, and the asymptotic performance bound is derived. Numerical examples are provided to verify the efficacy of the algorithm.
Article
Engineering, Marine
Weidong Wang, Xiangshui Li, Kai Zhang, Juan Shi, Wentao Shi, Wasiq Ali
Summary: In this paper, a two-step iterative minimization (TSIM) method is proposed to minimize the decline in direction of arrival (DOA) estimation performance for an acoustic vector sensor array (AVSA) with axial deviation and non-uniform noise. The method formulates the axial deviation measurement model of an AVSA by incorporating the disturbance parameter into the signal model, and defines a novel AVSA manifold matrix for estimating the sparse signal power and noise power. Two auxiliary cost functions based on covariance matrix fitting (CMF) criterion and weighted least squares (WLS) are presented to mitigate a joint optimization problem. Simulation results demonstrate the superiority and robustness of the proposed technique over several conventional algorithms.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Rui Wang, Saisai Wang, Kun Liang, Yuhan Xin, Fanfan Li, Yaxiong Cao, Jiaxin Lv, Qi Liang, Yaqian Peng, Bowen Zhu, Xiaohua Ma, Hong Wang, Yue Hao
Summary: A study reports on the use of indium-galim-zinc-oxide thin film phototransistors for in-sensor compression and computing. The results show that the system achieves efficient data processing while maintaining high recognition accuracy.
Article
Chemistry, Multidisciplinary
Kaixuan Wang, Shu Gong, Yuxin Zhang, Lim Wei Yap, Wenlong Cheng
Summary: Researchers have developed an acoustic sensor inspired by mosquito antennae, which can detect sound signals with high sensitivity and has a wide sensing range and fast response capability.
Article
Engineering, Electrical & Electronic
Ting Shu, Jin He, Trieu-Kien Truong
Summary: In this paper, the problem of passive direction finding using an AVS is addressed. The PVCA method is proposed to overcome the underdetermined direction finding using the spatial difference coarray. Unlike existing techniques, PVCA can be applied to arbitrary array geometries and does not reduce the spatial difference coarray aperture. It is shown that PVCA can resolve up to 13 sources for arrays near a reflecting boundary and 9 sources for arrays in free space.
CIRCUITS SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Jiazhi He, Zhen Huang, Xuefeng Feng
Summary: This study determines the optimal implementation of a biologically inspired coupling structure to enhance direction-finding performance, inspired by the auditory system of the parasitoid insect Ormia ochracea. The research focuses on the mechanism of the coupling structure, leading to significant performance improvement in crickets' sound frequency and reducing estimation error. By implementing both analogue circuit and digital filter methods, the digitally implemented coupling structure achieves theoretical optimal performance and approximates the Crame r-Rao lower bound in a direction-finding system prototype.
IET RADAR SONAR AND NAVIGATION
(2021)
Article
Biochemical Research Methods
Shun Yuan, Qing Zheng, Benjun Yao, Mingcong Wen, Weina Zhang, Jie Yuan, Hongxiang Lei
Summary: This paper presents a cellular micromotor-based viscosity sensor that utilizes an indirect optical method combining optical tweezers and microflows. The sensor achieves viscosity sensing by driving yeast cells or biocompatible SiO2 particles to generate microvortices and controlling the rotation of target yeast cells under viscous stress. The proposed method is safer, more flexible, and biocompatible, making it a potential detector of the function and pathological status of cells and tissues in vivo.
BIOMEDICAL OPTICS EXPRESS
(2022)
Review
Engineering, Biomedical
Baoqing Nie, Sidi Liu, Qing Qu, Yiqiu Zhang, Mengying Zhao, Jian Liu
Summary: Learning from nature provides endless inspiration for scientists to invent new materials and devices. This article reviews the state-of-the-art technologies of bio-inspired smart electronic skin (E-skin) and discusses the recent advancements in the development of E-skin and implantable devices.
ACTA BIOMATERIALIA
(2022)