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https://www.readbyqxmd.com/read/29149050/combining-a-disturbance-observer-with-triple-loop-control-based-on-mems-accelerometers-for-line-of-sight-stabilization
#1
Yong Luo, Yongmei Huang, Chao Deng, Yao Mao, Wei Ren, Qiongyan Wu
In the CCD-based fine tracking optical system (FTOS), the whole disturbance suppression ability (DSA) is the product of the inner loop and outer position loop. Traditionally, high sampling fiber-optic gyroscopes (FOGs) are added to the platform to stabilize the line-of-sight (LOS). However, because of the FOGs' high cost and relatively big volume relative to the back narrow space of small rotating mirrors, we attempt in this work to utilize a cheaper and smaller micro-electro-mechanical system (MEMS) accelerometer to build the inner loop, replacing the FOG...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29135873/the-effect-of-peripheral-vestibular-recovery-on-improvements-in-vestibulo-ocular-reflexes-and-balance-control-after-acute-unilateral-peripheral-vestibular-loss
#2
John H J Allum, Alja Scheltinga, Flurin Honegger
BACKGROUND: Patients with an acute unilateral peripheral vestibular deficit (aUPVD), presumed to be caused by vestibular neuritis, show asymmetrical vestibular ocular reflexes (VORs) that improve over time. Questions arise regarding how much of the VOR improvement is due to peripheral recovery or central compensation, and whether differences in peripheral recovery influence balance control outcomes. METHODS: Thirty patients were examined at aUPVD onset and 3, 6, and 13 weeks later with four different VOR tests: caloric tests; rotating (ROT) chair tests performed in yaw with angular accelerations of 5 and 20 degrees/s; and video head impulse tests (vHIT) in the yaw plane...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29102267/wearable-technology-for-spine-movement-assessment-a-systematic-review
#3
Enrica Papi, Woon Senn Koh, Alison H McGregor
Continuous monitoring of spine movement function could enhance our understanding of low back pain development. Wearable technologies have gained popularity as promising alternative to laboratory systems in allowing ambulatory movement analysis. This paper aims to review the state of art of current use of wearable technology to assess spine kinematics and kinetics. Four electronic databases and reference lists of relevant articles were searched to find studies employing wearable technologies to assess the spine in adults performing dynamic movements...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29092475/a-hybrid-method-for-accurate-star-tracking-using-star-sensor-and-gyros
#4
Jiazhen Lu, Lie Yang, Hao Zhang
Star tracking is the primary operating mode of star sensors. To improve tracking accuracy and efficiency, a hybrid method using a star sensor and gyroscopes is proposed in this study. In this method, the dynamic conditions of an aircraft are determined first by the estimated angular acceleration. Under low dynamic conditions, the star sensor is used to measure the star vector and the vector difference method is adopted to estimate the current angular velocity. Under high dynamic conditions, the angular velocity is obtained by the calibrated gyros...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29092162/compensation-of-thermal-strain-induced-polarization-nonreciprocity-in-dual-polarization-fiber-optic-gyroscope
#5
Rongya Luo, Yulin Li, Sheng Deng, Dong He, Chao Peng, Zhengbin Li
Dual-polarization interferometric fiber optic gyroscope (IFOG) is a novel scheme in which the polarization nonreciprocal (PN) phase error of the two orthogonal polarizations can be optically compensated. In this work, we investigate the effective of PN phase error compensation under varying temperature. It is proved that, the thermally induced strain deforms the fiber, and results in perturbations on the birefringence and polarization cross coupling which degrades the IFOG's stability. A wave propagation model and analytical expressions of PN phase error are derived by using coupled-wave equation and Jones matrix...
October 30, 2017: Optics Express
https://www.readbyqxmd.com/read/29089922/effects-of-subthalamic-and-nigral-stimulation-on-gait-kinematics-in-parkinson-s-disease
#6
Marlieke Scholten, Johannes Klemt, Melanie Heilbronn, Christian Plewnia, Bastiaan R Bloem, Friedemann Bunjes, Rejko Krüger, Alireza Gharabaghi, Daniel Weiss
Conventional subthalamic deep brain stimulation for Parkinson's disease (PD) presumably modulates the spatial component of gait. However, temporal dysregulation of gait is one of the factors that is tightly associated with freezing of gait (FOG). Temporal locomotor integration may be modulated differentially at distinct levels of the basal ganglia. Owing to its specific descending brainstem projections, stimulation of the substantia nigra pars reticulata (SNr) area might modulate spatial and temporal parameters of gait differentially compared to standard subthalamic nucleus (STN) stimulation...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29072605/modeling-of-thermal-phase-noise-in-a-solid-core-photonic-crystal-fiber-optic-gyroscope
#7
Ningfang Song, Kun Ma, Jing Jin, Fei Teng, Wei Cai
A theoretical model of the thermal phase noise in a square-wave modulated solid core photonic crystal fiber-optic gyroscope has been established, and then verified by measurements. The results demonstrate a good agreement between theory and experiment. The contribution of the thermal phase noise to the random walk coefficient of the gyroscope is derived. A fiber coil with 2.8 km length is used in the experimental solid core photonic crystal fiber-optic gyroscope, showing a random walk coefficient of 9.25 × 10(-5) deg/√h...
October 26, 2017: Sensors
https://www.readbyqxmd.com/read/29067816/sex-and-age-differences-in-head-acceleration-during-purposeful-soccer-heading
#8
Jaclyn B Caccese, Thomas A Buckley, Ryan T Tierney, William C Rose, Joseph J Glutting, Thomas W Kaminski
Differences in head-neck segment mass, purposeful heading technique, and cervical strength and stiffness may contribute to differences in head accelerations across sex and age. The purpose of this study was to compare head acceleration across sex and age (youth [12-14 years old], high school and collegiate) during purposeful soccer heading. One-hundred soccer players (42 male, 58 female, 17.1 ± 3.5 years, 168.5 ± 20.3 cm, 61.5 ± 13.7 kg) completed 12 controlled soccer headers at an initial ball velocity of 11...
October 25, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/29066747/automatic-recognition-of-therapy-progress-among-children-with-autism
#9
Agata Kołakowska, Agnieszka Landowska, Anna Anzulewicz, Krzysztof Sobota
The article presents a research study on recognizing therapy progress among children with autism spectrum disorder. The progress is recognized on the basis of behavioural data gathered via five specially designed tablet games. Over 180 distinct parameters are calculated on the basis of raw data delivered via the game flow and tablet sensors - i.e. touch screen, accelerometer and gyroscope. The results obtained confirm the possibility of recognizing progress in particular areas of development. The recognition accuracy exceeds 80%...
October 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29060911/virtual-proprioception-for-eccentric-training
#10
Robert LeMoyne, Timothy Mastroianni
Wireless inertial sensors enable quantified feedback, which can be applied to evaluate the efficacy of therapy and rehabilitation. In particular eccentric training promotes a beneficial rehabilitation and strength training strategy. Virtual Proprioception for eccentric training applies real-time feedback from a wireless gyroscope platform enabled through a software application for a smartphone. Virtual Proprioception for eccentric training is applied to the eccentric phase of a biceps brachii strength training and contrasted to a biceps brachii strength training scenario without feedback...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060793/a-low-cost-video-oculography-system-for-vestibular-function-testing
#11
Jihwan Park, Youngsun Kong, Yunyoung Nam
In order to remain in focus during head movements, vestibular-ocular reflex causes eyes to move in the opposite direction to head movement. Disorders of vestibular system decrease vision, causing abnormal nystagmus and dizziness. To diagnose abnormal nystagmus, various studies have been reported including the use of rotating chair tests and videonystagmography. However, these tests are unsuitable for home use due to their high costs. Thus, a low-cost video-oculography system is necessary to obtain clinical features at home...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060776/unsupervised-gait-detection-using-biomechanical-restrictions
#12
Shinji Hotta, Akihiro Inomata, Yuki Sasamoto, Shiho Washizawa, Brian Caulfield
Quantification of human gait with sensors has enormous potential in health and rehabilitation applications. Objective measurement of gait features in the home and community can reveal the true nature of impact of disease on activities of daily living or response to interventions. Previously reported gait event detection methods have achieved good success, yet can produce errors in some irregular gait patterns. In this paper, we propose a novel unsupervised detection of gait events and gait duration by combining two exclusive processes: (i) exploration of gait event candidates based on iterative running of existing methods with changing parameters and, (ii) selection of the candidate which satisfies gait-specific biomechanical restrictions (e...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060447/wireless-gyroscope-platform-enabled-by-a-portable-media-device-for-quantifying-wobble-board-therapy
#13
Robert LeMoyne, Timothy Mastroianni
The wobble board enables a therapy strategy for rehabilitation of the ankle foot complex. Quantification of therapy, such as through the use of a wobble board, can facilitate a therapist's acuity for advancing and optimizing the overall therapy strategy. The portable media device, such as an iPod, can be equipped with a software application to function as a wireless gyroscope platform. Integration of the wobble board with the portable media device functioning as a wireless gyroscope enables the potential for patient to therapist interaction through connectivity to the Internet...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060383/gait-speed-estimation-using-kalman-filtering-on-inertial-measurement-unit-data
#14
Md Nafiul Alam, Tamanna Tabassum Khan Munia, Reza Fazel-Rezai
Gait speed measurement is vital for diagnosis of motor disorder and monitoring the progress of patient rehabilitation. This study presents an algorithm for moderate distance gait speed measurement from data acquired with inertial motion sensors comprised of a tri-axial accelerometer and a tri-axial gyroscope. Gait speed was measured in four different speed levels set by a treadmill: 0.5, 1, 2, and 3 miles/hour. The calculated speed was tuned by implementing Kalman Filter. The performance of the proposed algorithm was evaluated by calculating the mean square error between estimated speed and the actual treadmill speed...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060141/design-of-the-wearable-device-for-hemiplegic-gait-detection-using-an-accelerometer-and-a-gyroscope
#15
Sooji Park, Jun Seok Lee, Jaekyung Kwak, Hangsik Shin
Hemiplegic walking is the main symptom of hemiplegia and is the basis for judging the outcome or severity of hemiplegia. In this study, we developed a wearable measurement module for measuring the inertia signal generated during walking and evaluated the possibility of gait measurement as a basic study of the new hemiplegia diagnosis technology using wearable device. The developed measurement module is worn on the waist. It is equipped with 3-axis acceleration sensor and 3-axis angular velocity sensor and has the function to transmit and record data through wireless communication...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060047/facial-expression-classification-using-eeg-and-gyroscope-signals
#16
Jake Toth, Mahnaz Arvaneh
In this paper muscle and gyroscope signals provided by a low cost EEG headset were used to classify six different facial expressions. Muscle activities generated by facial expressions are seen in EEG data recorded from scalp. Using the already present EEG device to classify facial expressions allows for a new hybrid brain-computer interface (BCI) system without introducing new hardware such as separate electromyography (EMG) electrodes. To classify facial expressions, time domain and frequency domain EEG data with different sampling rates were used as inputs of the classifiers...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059827/using-measurements-from-wearable-sensors-for-automatic-scoring-of-parkinson-s-disease-motor-states-results-from-7-patients
#17
Thomas Ilias, Bergquist Filip, Constantinescu Radu, Nyholm Dag, Senek Marina, Memedi Mevludin
The objective of this study was to investigate the validity of an objective gait measure for assessment of different motor states of advanced Parkinson's disease (PD) patients. Seven PD patients performed a gait task up to 15 times while wearing sensors on their upper and lower limbs. Each task was performed at specific points during a test day, following a single dose of levodopa-carbidopa. At the time of the tasks the patients were video recorded and three movement disorder experts rated their motor function on three clinical scales: a treatment response scale (TRS) that ranged from -3 (very bradykinetic) to 0 (ON) to +3 (very dyskinetic), a dyskinesia score that ranged from 0 (no dyskinesia) to 4 (extreme dyskinesia), and a bradykinesia score that ranged from 0 (no bradykinesia) to 4 (extreme bradykinesia)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29055333/anisotropic-kinetic-energy-release-and-gyroscopic-behavior-of-co2-super-rotors-from-an-optical-centrifuge
#18
Matthew J Murray, Hannah M Ogden, Amy S Mullin
An optical centrifuge is used to generate an ensemble of CO2 super rotors with oriented angular momentum. The collision dynamics and energy transfer behavior of the super rotor molecules are investigated using high-resolution transient IR absorption spectroscopy. New multipass IR detection provides improved sensitivity to perform polarization-dependent transient studies for rotational states with 76 ≤ J ≤ 100. Polarization-dependent measurements show that the collision-induced kinetic energy release is spatially anisotropic and results from both near-resonant energy transfer between super rotor molecules and non-resonant energy transfer between super rotors and thermal molecules...
October 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29047940/experimental-analysis-of-the-dynamic-north-finding-method-based-on-a-fiber-optic-gyroscope
#19
Zhu Zhou, Zhongwei Tan, Xinyue Wang, Ziyu Wang
This paper demonstrates the principles of static and dynamic north-finding methods by measuring the projection of the Earth's rotation rate with a fiber optic gyroscope. For a comprehensive comparison of the two methods, the influence of a closed-loop feedback mechanism of a servo motor in a turntable is taken into consideration. Thus, we proposed the static and dynamic north-finding experimental implementations according to the different impact of the motor jitters and the different seeking times. Experimental results show that the dynamic method can reduce the north-finding bias error and instability by 60...
August 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047755/common-mode-noise-reduction-in-an-atomic-spin-gyroscope-using-optical-differential-detection
#20
Lihong Duan, Wei Quan, Liwei Jiang, Wenfeng Fan, Ming Ding, Zhaohui Hu, Jiancheng Fang
Optical rotation of linearly polarized light is used to measure atom spin precession in an atomic spin gyroscope (ASG). However, the common-mode noise in the polarization measurement seriously affects the performance of the sensitive ASG. Here we propose an optical differential detection method based on the photoelastic polarization modulation, which could effectively eliminate the light power fluctuation of the laser source and optical elements, while removing the polarization noise and the residual birefringence...
September 20, 2017: Applied Optics
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