Integrated micro self-adaptive sampling acceleration measurement system

AbstractOn Sunday, June 19, 2016, a Space Acceleration Measurement System triaxial sensor head flew on a suborbital flight aboard Blue Origin's New Shepard vehicle to collect precision vibratory accelerometry data. The Space Acceleration Measurement System (SAMS) sensor head was mounted inside of a Blue Origin single payload locker inside of the crew capsule. This paper describes the configuration, capture, and analysis of the SAMS data from this flight along with other, related flight log information provided by Blue Origin. Three overlapping periods during the flight were identified and characterized to provide future users of the platform with insight into options that may prove suitable for their research needs. Average accelerations in the Post-Separation Period were consistent with other low-g research platforms, while the shorter Microgravity Period in the middle of the flight showed ultra-quiet vibratory acceleration environments. Researchers can consider this microgravity quality versus time a tradeoff in their experimental designs.

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High-Precision Acceleration Measurement System Based on Tunnel Magneto-Resistance Effect

Sensors ◽

10.3390/s20041117 ◽

2020 ◽

Vol 20 (4) ◽

pp. 1117 ◽

Cited By ~ 1

Author(s):

Lu Gao ◽

Fang Chen ◽

Yingfei Yao ◽

Dacheng Xu

Keyword(s):

Magnetic Field ◽

High Precision ◽

Measurement System ◽

Frequency Modulation ◽

High Frequency ◽

Low Noise ◽

Acceleration Measurement ◽

Field Source ◽

Modulation Technique ◽

Magneto Resistance

A high-precision acceleration measurement system based on an ultra-sensitive tunnel magneto-resistance (TMR) sensor is presented in this paper. A “force–magnetic–electric” coupling structure that converts an input acceleration into a change in magnetic field around the TMR sensor is designed. In such a structure, a micro-cantilever is integrated with a magnetic field source on its tip. Under an acceleration, the mechanical displacement of the cantilever causes a change in the spatial magnetic field sensed by the TMR sensor. The TMR sensor is constructed with a Wheatstone bridge structure to achieve an enhanced sensitivity. Meanwhile, a low-noise differential circuit is developed for the proposed system to further improve the precision of the measured acceleration. The experimental results show that the micro-system achieves a measurement resolution of 19 μg/√Hz at 1 Hz, a scale factor of 191 mV/g within a range of ± 2 g, and a bias instability of 38 μg (Allan variance). The noise sources of the proposed system are thoroughly investigated, which shows that low-frequency 1/f noise is the dominant noise source. We propose to use a high-frequency modulation technique to suppress the 1/f noise effectively. Measurement results show that the 1/f noise is suppressed about 8.6-fold at 1 Hz and the proposed system resolution can be improved to 2.2 μg/√Hz theoretically with this high-frequency modulation technique.

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Optimizing Network Measurements through Self-adaptive Sampling

2012 IEEE 14th International Conference on High Performance Computing and Communication & 2012 IEEE 9th International Conference on Embedded Software and Systems ◽

10.1109/hpcc.2012.112 ◽

2012 ◽

Author(s):

Joao Marco C. Silva ◽

Solange Rito Lima

Keyword(s):

Adaptive Sampling ◽

Network Measurements ◽

Self Adaptive

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Design of MEMS accelerometer based acceleration measurement system for automobiles

Measurement Science Review ◽

10.2478/v10048-012-0029-2 ◽

2012 ◽

Vol 12 (5) ◽

Cited By ~ 4

Author(s):

K. Arun Venkatesh ◽

N. Mathivanan

Keyword(s):

Measurement System ◽

Acceleration Measurement ◽

Mems Accelerometer

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Validation of a Wireless Head Acceleration Measurement System for Use in Soccer Play

Journal of Applied Biomechanics ◽

10.1123/jab.26.4.424 ◽

2010 ◽

Vol 26 (4) ◽

pp. 424-431 ◽

Cited By ~ 27

Author(s):

Erin Hanlon ◽

Cynthia Bir

Keyword(s):

Measurement System ◽

Cross Correlation ◽

Angular Acceleration ◽

Strong Relationship ◽

Head Acceleration ◽

Acceleration Measurement ◽

Hybrid Iii ◽

Cross Correlations ◽

Rms Error ◽

Soccer Heading

Soccer heading has been studied previously with conflicting results. One major issue is the lack of knowledge regarding what actually occurs biomechanically during soccer heading impacts. The purpose of the current study is to validate a wireless head acceleration measurement system, head impact telemetry system (HITS) that can be used to collect head accelerations during soccer play. The HIT system was fitted to a Hybrid III (HIII) head form that was instrumented with a 3-2-2-2 accelerometer setup. Fifteen impact conditions were tested to simulate impacts commonly experienced during soccer play. Linear and angular acceleration were calculated for both systems and compared. Root mean square (RMS) error and cross correlations were also calculated and compared for both systems. Cross correlation values were very strong withr= .95 ± 0.02 for ball to head forehead impacts andr= .96 ± 0.02 for head to head forehead impacts. The systems showed a strong relationship when comparing RMS error, linear head acceleration, angular head acceleration, and the cross correlation values.

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