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Fiber optic birefringence enhanced accelerometer based on polarized modal interferometer
摘要： An inline fiber optic birefringence enhanced accelerometer (FOBEA) which applies one polarizer and a ten-meter high birefringence fiber wrapped on a transducer cylinder is proposed. Birefringence of polarized modes in panda polarization maintaining fiber (PMF) is enhanced by fiber coating and cylinders of different parameters. Accelerometers with copper cylinder (FOBEA-1) and polyurethane cylinder (FOBEA-2) are fabricated, the tested average sensitivities are 1.06rad/g (20-3800 Hz) and 16.97 rad/g (20-2000 Hz). The experimental results show the birefringence gain of FOBEA-1 is in good consistent with theoretical calculation of 1.07 and an additional birefringence gain of FOBEA-2 is 5.52 because the polyurethane cylinder works as fiber coating with the thickness of 1.21 mm. Temperature crosstalk is also investigated.
关键词： Polarized modal interferometer,Fiber optic accelerometer,Sensitivity,Transducer cylinder,Birefringence gain
更新于2025-11-28 14:23:57
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[IEEE 2018 Sixth International Symposium on Computing and Networking Workshops (CANDARW) - Takayama, Japan (2018.11.27-2018.11.30)] 2018 Sixth International Symposium on Computing and Networking Workshops (CANDARW) - Proposal and Evaluation of Secure Device Pairing Method with Camera and Accelerometer
摘要： With the advancement of wireless short-range technology, the number of mobile devices is also increasing. Consequently, devices often exchange information using wireless communications, but this communication has vulnerabilities, such as eavesdropping and man-in-the-middle attack. Therefore, it is necessary to perform secure pairing between devices before wireless communication begin. In this paper, we assume that devices are securely paired in limited space, such as a room using wireless communication. The method for secure pairing using Received signal strength (RSS) is simple, but RSS is easy to change due to environmental factors. Recently, pairing method using camera and accelerometer is studied. However, these methods do not directly detect inclination of the device. We propose the one of secure device pairing method using camera and accelerometer. Our proposed method makes the camera read a marker on the display of the device. The marker’s inclination is corresponds to the device’s inclination, hence, we assume that the accuracy is higher than that of existing methods.
关键词： camera-based authentication,device accelerometer,device authentication,secure device pairing
更新于2025-09-23 15:23:52
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[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI, USA (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Improved Heart Rate Tracking Using Multiple Wrist-type Photoplethysmography during Physical Activities
摘要： Photoplethysmography (PPG) signals collected from wearable sensing devices during physical exercise are easily corrupted by motion artifact (MA), which poses great challenge on heart rate (HR) estimation. This paper proposes a new framework to accurately estimate HR using two leads of PPG signals in combination with accelerometer (ACC) data in the presence of MA. A moving time window is first used to segment PPG signals and ACC signals. Then, MA is attenuated by joint sparse spectrum reconstruction in each time window, where maximum spectrum frequencies of ACC are subtracted from the spectrum frequency of PPG signals. Further, HR for each cleansed PPG is estimated from the frequency with maximum amplitude in the sparse spectrum. The actual HR is determined using spectral band powers calculated from each reconstructed PPG signals. The proposed method was validated using the 2015 IEEE Signal Processing Cup dataset. The average absolute error is 1.15 beats per minutes (BPM) (standard deviation: 2.00 BPM), and the average absolute error percentage is 0.95% (standard deviation: 1.86%). The proposed method outperforms the previously reported work in terms of accuracy.
关键词： accelerometer (ACC),heart rate (HR),motion artifact (MA),joint sparse spectrum reconstruction,Photoplethysmography (PPG)
更新于2025-09-23 15:21:01
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Realtime Online Daily Living Activity Recognition Using Head-Mounted Display
摘要： Human activity recognition is one of the popular research fields. The results of this study can be applied to many other fields such as the military, commercialism, and health. With the advent of the wearable head mounted display device mainly like google glass raises the possibility of this research. In this study tries to identify everyday activities are often called the ambient activity. Development of the system is done online using a smartphone and a head mounted display. The system produces an accuracy above 90%, which can be concluded that the system was able to recognize the activities with great accuracy.
关键词： accelerometer,sensor,Android,head mounted display
更新于2025-09-23 15:19:57
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Theoretical and experimental study on optical fiber microseismic accelerometer based on cantilever beam structure
摘要： According to the characteristics of underground environment and microseismic signal in coal mine, a kind of optical fiber microseismic accelerometer based on cantilever beam structure is put forward in this paper, and its mechanical model is established, its sensitivity is analyzed, and tested by B&K shaking table test system. The experimental results show that the frequency response range of the sensor is 10Hz-100Hz, which meets the requirements of microseismic test.
关键词： FBG,accelerometer,microseismic,cantilever beam,frequency response
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Fiber optic planar accelerometer based on modal interferometer
摘要： A fiber optic planar accelerometer for low frequency micro-vibration detection is proposed. The measured sensitivity, resolution and directional crosstalk are 227.82 mV/g, 12.54 μg/√Hz and -45.88 dB (8-100 Hz). The temperature crosstalk is -0.5 nm/°C.
关键词： crosstalk,fiber optic accelerometer,modal interferometer
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 5th International Workshop on Metrology for AeroSpace (MetroAeroSpace) - Torino, Italy (2019.6.19-2019.6.21)] 2019 IEEE 5th International Workshop on Metrology for AeroSpace (MetroAeroSpace) - Progress on Laser Gauge Interferometer (LIG-A) for high resolution accelerometers
摘要： We present the design and preliminary results of an accelerometer based on a classical mass spring mechanical system with an interferometric readout. The heterodyne interferometer is based on a 1064 nm fiber laser source, all fiber components and reaches resolutions of less than 1 pm/√Hz at 1 Hz and about 200 pm/√Hz at 1 mHz.
关键词： space accelerometer,Laser interferometer
更新于2025-09-11 14:15:04
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An investigation into the influence of mass inertia using primary calibration of the back-to-back accelerometer by laser interferometry
摘要： In this paper, we discuss the effects of loading mass deformation and contact stiffness by giving various mass loadings in high-frequency primary calibration of the back-to-back accelerometer up to 20 kHz. The experimental contradiction of sensitivity and phase shift with respect to the mass loading effect described in the international standard document ISO 16063-11 indicates that there is no deformation of the loading mass, but only the effect of contact stiffness. In order to explain the validity of the contact stiffness according to the experimental results, it was verified by using a physical model and the finite element method with COMSOL software. As a result, the screw-joint function of the screw in the software agreed with the experimental result concerning the contact stiffness.
关键词： primary calibration,mass inertia,ISO 16063-11,back-to-back accelerometer,vibration,dummy mass
更新于2025-09-11 14:15:04
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Analysis and Design of Closed-loop Detection Technique for Micro-grating Accelerometer
摘要： A novel control method with closed-loop Pound-Drever-Hall (PDH) modulation technology is proposed to optimize the linearity and detection accuracy of micro-grating accelerometer in practical application. The closed-loop error is modulated to a high frequency for eliminating the direct current (DC) component of the interference intensity and stray light disturbance. After phase sensitive detector (PSD) and filter of demodulation, the closed-loop error signal is obtained with high signal to noise ratio (SNR). Based on the principle of designed modulation and demodulation method, the dynamic model of closed-loop micro-grating accelerometer is established considering the nonlinear interference effect, optical intensity fluctuation and unavoidable noise. Then, a robust control algorithm is designed to optimize the performance of micro-grating accelerometer. The experimental results demonstrate that the micro-grating accelerometer has linearity within 0.35% and the bias stability 0.2mg, which validate the effectiveness and usefulness of the proposed closed-loop detection scheme.
关键词： control,closed-loop detection,micro-grating accelerometer,signal process
更新于2025-09-11 14:15:04
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Motion Artifact Cancellation in Wearable Photoplethysmography Using Gyroscope
摘要： Wearable reflectance-type photoplethysmography (PPG) sensors, in the form of a band or watch, have recently gained significant attention for real-time heart rate (HR) monitoring applications. To accurately estimate the HR, even during intensive exercise, much effort has focused on simultaneously measured accelerometer signals that cancel out motion artifacts (MAs) from the PPG signal. However, the accelerometer does not always measure true MAs, as it measures not only the acceleration of motion but also gravitational acceleration corresponding to each axis of the accelerometer. In addition, the measured acceleration of the motion itself does not always coincide with the true motion. In this paper, we address the limitations of accelerometers and present an approach using a gyroscope to overcome the issues described. To our knowledge, the limitations of the acceleration signals for MA cancellation have not been addressed in-depth. Here we describe our developed wearable reflectance-type PPG sensor and compare the HR estimation performance between using a gyroscope and an accelerometer from 24 subjects. Our results showed that the gyroscope-assisted approach exhibited better performance than the accelerometer-assisted approach, especially for exercise involving walking.
关键词： wearable device,motion artifacts,photoplethysmography,Accelerometer,gyroscope
更新于2025-09-10 09:29:36