Papers by Keyword: Accelerometer

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Authors: Li Qian
Abstract: Accelerometer is the important sensor of MEMS inertial sensors and is applied in many occasions. A three dimension model is designed to accomplish rotary motion in 3D space and the model is introduced to the computer input system to enhance the functions of the computer input system. In order to indicate the feasibility and effectiveness, a Demo platform with AVR controller is designed to control the rotary motion of accelerometer solid model.
1357
Authors: Ming Gui Tan, Cheng Boon Leong, Jee Hou Ho, Hui Ting Goh, Hoon Kiat Ng
Abstract: The demand for quantitative gait analysis increases due to increasing number of neurological disorder patients. Conventional gait analysis tools such as 3D motion capture systemsare relatively expensive. Therefore, there is a need to develop a low cost sensor system to obtain the spatial temporal gait parameters without compromising too much on the accuracy. This paper describesthe development of a wearable low cost sensor system which consists ofrelatively less sensing elements with 2 accelerometers, 4 force sensitive resistors (FSR) and 2 EMG electrodes. Thesensor output was validated by a vision system and the relative error was less than 5% formost of the gait parameters measured.
212
Authors: Wei Dong, Jing Ran Zhou, Wen Bin Guo, Xin Dong Zhang, Cai Xia Liu, Liang Shen, Sheng Ping Ruan, Wei You Chen
Abstract: A differential capacitive accelerometer with four folded springs and changeable area was designed and fabricated. It was composed of upper electrode(proof mass), four folded springs、lower comb electrode. Modal and statics were analyzed by ANSYS, accelerometer was fabricated by bond and ICP etching technology. Detection circuit was fabricated and the test was completed. The maximum measured acceleration is 12g, sensitivity is 86mV/g, and precision is higher than ±4.5%.
1470
Authors: Shu Lin Wang, Zhe George Zhang, You Gang Guo
Abstract: Along with the continuous changes and improvement of information technology, remote controls are widely used in smart living, robot control, Sign language systems, and so on. However, the human-computer communication needs to be diversified in the future. In particular, users are not intuitive when applying a special application or remote control environment, thus, this study applying Nintendo Wii remote as a human-computer interface device, to capture motion data by built-in three-axis accelerometer sensor, and training and recognize with Hidden Markov Model. First, we apply a gesture recognize system, to enhance the interactive ability of three-axis accelerometer sensor, gesture commands are trainable by user on-demand, and users can interactive with different computer applications through the gesture command has been trained. Finally, this study had issued a Gesture Recognition approach for intelligent interactive system design and for future study.
938
Authors: Yao Guang Li, Xiao Wei Liu, Yan Xiao, Yun Tao Liu
Abstract: This paper reports on a system level design and analysis of a single-loop fourth-order sigma-delta (ΣΔ) accelerometer. Compared with a second-order single-loop ΣΔ modulator (ΣΔM) formed by the sensing element here the sensing element is cascaded with two extra electronic integrators to form the fourth ΣΔM, which has the advantages of better signal to quantization noise ratio (SQNR). System level simulation results indicate that the SQNR is 96.86 dB, and the effective number of bits (ENOB) is 15.8 bits when the over sampling ratio (OSR) is 128. Stability of the system is analyzed by root locus method based on the linear model established in this work, and the minimum gain of the quantizer Kq min is about 0.375.
422
Authors: Qi Qi Ge
Abstract: A special designed 2D accelerometer was successfully used in the design of the minitype 2D vector hydrophone. The theory, design and experiment test data of both the accelerometer and the vector hydrophone was presented in this paper. The accelerometer based on cantilever beam mode and used PZT tube to substitute the PZT plate which was traditional used, this substitution enhanced the mechanical strength of the accelerometer, which resulted to the high performance of the 2D vector hydrophone in its natural frequency and sensitivity. The outside electrode of the PZT tube was divided into four equivalent parts, and each opposite part was wiring connected into one accelerometer channel, thus the two orthotropic accelerometer channels was integrate into one 2D cantilever beam mode accelerometer. The minitype vector hydrophone was designed based on this compact 2D accelerometer, and it’s high performace makes it possible to be used in under water sonar transducer arrays.
273
Authors: Xian Wei Wang, Jun Hai Jiang
Abstract: In this paper a low-cost Micro-Electro-Mechanical System (MEMS) inertial measurement unit is designed, a 3-axis accelerometer and 3-axis gyroscope simulated 6 degrees of freedom orientation sensing through sensor fusion. By analyzing a simple complimentary filter and a more complex Kalman filter, the outputs of each sensor were combined and took advantage of the benefits of both sensors to improved results. The experimental results demonstrate that the output signal can be corrected suitability by means of the proposed method.
42
Authors: Chang De He, Wen Dong Zhang, Ji Jun Xiong, Chen Yang Xue, Gui Xiong Shi
Abstract: A 50,000g three-axis accelerometer using a single proof mass is presented. The sensitive structure is made of a single proof mass and eight cantilever beams. Twelve piezoresistors are placed on the cantilevers symmetrically, which can be used to detect 3-dimensional acceleration. The symmetric placement of the piezoresistors brings the reasonable sensitivity and simultaneously decreases the cross-axis sensitivity significantly. Simulation results show that the sensitivity in X-, Y- and Z-axis are 0.806uV/g, 0.806uV/g and 3.71uV/g respectively with 5V supply and the cross-axis sensitivities are all less than 2.4%, which ensures the high performance of the three-axis accelerometer.
691
Authors: Jian Yan Wang, Ting Ting Wang, Hang Guo
Abstract: Accelerometer in MEMS always is made by capacitive or piezoresistive, whose dynamic response is not good, the operating frequency is narrow, and the cross-axis sensitivity is low. A new type of piezoelectric micro-accelerometer is designed, and its structure is “x” type. The sensing unit is piezoelectric PZT films, which is achieved by sol-gel method. The accelerometer is a triaxial accelerometer. The theoretical and simulation analysis is used to achieve the charge sensitivity and response frequency, and also get the optimal structural parameters. A new circuit connection is proposed to improve the sensitivity and avoid the cross-axis sensitivity. The design achieves the z-axis sensitivity with more than 40 pC/g, x, y-axis sensitivity with more than 8pC/g, and the response frequency is about 3000Hz.
841
Authors: Bing Tao Lin, Jian Hua Zhao, Wen Yun Li, Qian Zhou, Xin Man, Ri Le Lin, Bang Ying Weng, Hong Kui Dong, Zhou Xu, Qiao Yun Zhang
Abstract: A digital closed-loop control quartz accelerometer with new structures is performed, which overcomes the disadvantages of restriction of measurement range and sensitivity of QVBA (quartz vibrating beam accelerometer). It has not only the same precision as QVBA in theory, but also large measurement range without reducing the sensitivity. The accelerometer is proposed to be used in large range and high-precision measurement of acceleration.
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