Accelerometer and Magnetometer: From Fundamentals to Applications, 2nd Edition

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: 15 January 2025 | Viewed by 5771

Special Issue Editors


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Guest Editor
TianQin Research Center for Gravitational Physics, School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, China
Interests: MEMS; micro-sensors; micro-actuators; micromachined design and optimization; advanced microfabrication techniques; detecting and conditioning circuits
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Guest Editor
PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: MEMS; accelerometer; tilt sensor; seismic sensor; gravity sensor
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Accelerometers and magnetometers are widely applied in consumer electronics, automobiles, precision manufacturing and defense, aerospace and geophysical functions. MEMS technology can meet these applications’ requirements of Cost, Size, Weight and Power (CSWaP) and performance, although some sensors still demonstrate scientific barriers to such uses. Key challenges include, but are not limited to, the following: microfabrication processes, new materials, device design and optimization, interface circuits, signal processing and sensor fusions. In addition, the promising new mechanisms of micromachines, such as atomic, optical levitation and optomechanical technologies, are of great interest. This Special Issue calls for original research papers and reviews detailing state-of-the-art results on the present topic.

Prof. Dr. Liangcheng Tu
Prof. Dr. Huafeng Liu
Guest Editors

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Keywords

  • accelerometer
  • magnetometer
  • MEMS sensor
  • inertial sensor
  • seismometer
  • gravimeter
  • sensing mechanism
  • sensor fusion
  • inertial navigation
  • new application

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Published Papers (3 papers)

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Research

19 pages, 8087 KiB  
Article
Compensation Techniques for Photosensors Used in High-Precision Accelerometers
by Yuan Wei, Jianhua Yang, Pengfei Li, Junling Zhang and Pu Liang
Micromachines 2024, 15(9), 1131; https://doi.org/10.3390/mi15091131 - 5 Sep 2024
Viewed by 715
Abstract
Temperature exerts a profound influence on the fidelity of photosensors, making the attainment of reliable temperature compensation a formidable task within engineering realms. This research delves into the intricacies of photosensors used in high-precision accelerometers, proposing an innovative, high-precision, adaptive, closed-loop compensation mechanism. [...] Read more.
Temperature exerts a profound influence on the fidelity of photosensors, making the attainment of reliable temperature compensation a formidable task within engineering realms. This research delves into the intricacies of photosensors used in high-precision accelerometers, proposing an innovative, high-precision, adaptive, closed-loop compensation mechanism. Our design stands in stark contrast to traditional open-loop models, demonstrating superior performance by achieving a remarkable reduction in compensation error—nearly 98%. This advancement in consistency and precision marks a significant leap forward for the application of high-precision photosensors in engineering contexts. Full article
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16 pages, 6988 KiB  
Article
Online Handwriting Recognition Method with a Non-Inertial Reference Frame Based on the Measurement of Linear Accelerations and Differential Geometry: An Alternative to Quaternions
by Griselda Stephany Abarca Jiménez, Carmen Caritina Muñoz Garnica, Mario Alfredo Reyes Barranca, Jesús Mares Carreño, Manuel Vladimir Vega Blanco and Francisco Gutiérrez Galicia
Micromachines 2024, 15(8), 1053; https://doi.org/10.3390/mi15081053 - 21 Aug 2024
Viewed by 740
Abstract
This work describes a mathematical model for handwriting devices without a specific reference surface (SRS). The research was carried out on two hypotheses: the first considers possible circular segments that could be made during execution for the reconstruction of the trace, and the [...] Read more.
This work describes a mathematical model for handwriting devices without a specific reference surface (SRS). The research was carried out on two hypotheses: the first considers possible circular segments that could be made during execution for the reconstruction of the trace, and the second is the combination of lines and circles. The proposed system has no flat reference surface, since the sensor is inside the pencil that describes the trace, not on the surface as in tablets or cell phones. An inertial sensor was used for the measurements, in this case, a commercial Micro-Electro Mechanical sensor of linear acceleration. The tracking device is an IMU sensor and a processing card that allows inertial measurements of the pen during on-the-fly tracing. It is essential to highlight that the system has a non-inertial reference frame. Comparing the two proposed models shows that it is possible to construct shapes from curved lines and that the patterns obtained are similar to what is recognized; this method provides an alternative to quaternion calculus for poorly specified orientation problems. Full article
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11 pages, 2195 KiB  
Article
High-Dynamic-Range Integrated NV Magnetometers
by Tianning Wang, Zhenhua Liu, Yankang Liu, Bo Wang, Yuanyuan Shen and Li Qin
Micromachines 2024, 15(5), 662; https://doi.org/10.3390/mi15050662 - 18 May 2024
Viewed by 1566
Abstract
High-dynamic-range integrated magnetometers demonstrate extensive potential applications in fields involving complex and changing magnetic fields. Among them, Diamond Nitrogen Vacancy Color Core Magnetometer has outstanding performance in wide-range and high-precision magnetic field measurement based on its inherent high spatial resolution, high sensitivity and [...] Read more.
High-dynamic-range integrated magnetometers demonstrate extensive potential applications in fields involving complex and changing magnetic fields. Among them, Diamond Nitrogen Vacancy Color Core Magnetometer has outstanding performance in wide-range and high-precision magnetic field measurement based on its inherent high spatial resolution, high sensitivity and other characteristics. Therefore, an innovative frequency-tracking scheme is proposed in this study, which continuously monitors the resonant frequency shift of the NV color center induced by a time-varying magnetic field and feeds it back to the microwave source. This scheme successfully expands the dynamic range to 6.4 mT, approximately 34 times the intrinsic dynamic range of the diamond nitrogen-vacancy (NV) center. Additionally, it achieves efficient detection of rapidly changing magnetic field signals at a rate of 0.038 T/s. Full article
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