scholarly journals Capacitive Sensor Accuracy Optimisation by the Frequency Range Appropriate Choice

2021 ◽  
Author(s):  
Zine Ghemari ◽  
Salah Belkhiri
Keyword(s):  
Measurement Error ◽  
Natural Frequency ◽  
Relative Frequency ◽  
Model Simulation ◽  
Capacitive Sensor ◽  
Vibration Sensor ◽  
Electronic Instrument ◽  
Frequency Range ◽  
Rotating Machine ◽  
Sensor Accuracy

Abstract Measuring rotating machine vibrations requires an electronic instrument called a vibration sensor. In this work, the vibration sensor with capacitive detection is chosen to measure the vibrations movement. In order to fulfill the objectives of reducing the measurement error and achieving high sensor accuracy, this sensor is modeled by the application of motion law. The results obtained by the developed model simulation showed that it was possible to extract a formula linked to relative frequency of the vibrating structure and to the capacitive sensor natural frequency, this makes it possible to reduce the measurement error and improve the capacitive sensor accuracy

scholarly journals An automatic electronic instrument for accurate measurements of food volume and density

2020 ◽  
pp. 1-8
Author(s):  
Ding Yuan ◽  
Xiaohui Hu ◽  
Hong Zhang ◽  
Wenyan Jia ◽  
Zhi-Hong Mao ◽  
...  
Keyword(s):  
Measurement Error ◽  
Electric Field ◽  
Dietary Assessment ◽  
Automatic Process ◽  
Surface Model ◽  
Electronic Instrument ◽  
Technological Gap ◽  
Nutrition Science ◽  
Volumetric Model ◽  
3D Point Cloud Reconstruction

Abstract Objective: Accurate measurements of food volume and density are often required as ‘gold standards’ for calibration of image-based dietary assessment and food database development. Currently, there is no specialised laboratory instrument for these measurements. We present the design of a new volume of density (VD) meter to bridge this technological gap. Design: Our design consists of a turntable, a load sensor, a set of cameras and lights installed on an arc-shaped stationary support, and a microcomputer. It acquires an array of food images, reconstructs a 3D volumetric model, weighs the food and calculates both food volume and density, all in an automatic process controlled by the microcomputer. To adapt to the complex shapes of foods, a new food surface model, derived from the electric field of charged particles, is developed for 3D point cloud reconstruction of either convex or concave food surfaces. Results: We conducted two experiments to evaluate the VD meter. The first experiment utilised computer-synthesised 3D objects with prescribed convex and concave surfaces of known volumes to investigate different food surface types. The second experiment was based on actual foods with different shapes, colours and textures. Our results indicated that, for synthesised objects, the measurement error of the electric field-based method was <1 %, significantly lower compared with traditional methods. For real-world foods, the measurement error depended on the types of food volumes (detailed discussion included). The largest error was approximately 5 %. Conclusion: The VD meter provides a new electronic instrument to support advanced research in nutrition science.

Optimization of the Damping Seat’s Body Structure Based on the Task Space

2014 ◽  
Vol 1055 ◽  
pp. 143-146
Author(s):  
Hai Xian Zhao
Keyword(s):  
Natural Frequency ◽  
Suspension System ◽  
Vehicle Body ◽  
Optimized Design ◽  
Body Structure ◽  
Dimensional Problem ◽  
Task Space ◽  
System Research ◽  
Frequency Range ◽  
Seat Suspension

This paper is contrary to the seat multi-dimensional problem basing on task space. Using double triangle steward parallel mechanism as the main structure of the seat suspension, according to the sensitive frequency range and the natural frequency of vehicle body, we optimize the design of the suspension system. Research shows that the optimized design of the double triangle Stewart parallel suspension seat suspension system to ensure vertical, pitch, roll three of the more important natural frequency both directions away from the vehicle's natural frequency, but also avoid the human body sensitive frequency range.

An Electronic Instrument for the Accurate Measurement of the Frequency of Structural Oscillations

1957 ◽  
Vol 61 (554) ◽  
pp. 125-127
Author(s):  
W. D. T. Hicks
Keyword(s):  
Electronic Instrument ◽  
Frequency Range ◽  
Time Duration ◽  
Number Of Cycles ◽  
Better Than

An instrument is described which measures the time duration of a specified number of complete cycles of an oscillation over the frequency range OT cycles per second to 500 cycles per second. The accuracy of the reading is dependent on the frequency measured and the number of cycles taken; but, in most cases, an accuracy better than 01 per cent is obtainable. The construction of the instrument is described and circuit diagrams given.

Electrical Characterization of High Performance Memory FBGA BOC Package

2006 ◽  
Vol 3 (1) ◽  
pp. 44-51
Author(s):  
M. Gospodinova ◽  
G. Nan ◽  
J. Thomas ◽  
R. Subraya ◽  
J. Held
Keyword(s):  
High Performance ◽  
Model Simulation ◽  
Electrical Characterization ◽  
Frequency Range ◽  
Lumped Model ◽  
Time Domain Signal ◽  
Fine Pitch ◽  
S Parameter ◽  
On Chip ◽  
5 Ghz

A multilayer Fine-pitch Ball Grid Array (FBGA) Board-on-chip (BOC) memory package used for applications running at more than 1 Gbit/p/s has been characterized using S-(distributed) parameter measurements and three types of test chips made using state of the art technology. The low parasitics FBGA test board itself was characterized for frequencies up to 5 GHz (the frequency range of interest) with the transmission being greater than −0.12 dB below 5 GHz. S-parameter model simulation of the package itself indicated that the transmission was greater than −1.5 dB up to 5 GHz. Correlation between the S-parameter simulation and measurements for the package and fixture combined was acceptable - in the order of tenths of dB in the frequency range DC to 2.5 GHz. Comparison of the S-parameter model versus lumped (RLC) model in the frequency range from DC to 5 GHz showed that the lumped model can be used for frequencies up to 2.9 GHz. A high degree of correlation between simulation and measurement has been shown. The lumped model bandwidth has been assessed and its application limits for time domain signal integrity simulations have been evaluated.

Research of Displacement Measuring System Based on Capacitive Grating Sensor

2010 ◽  
Vol 20-23 ◽  
pp. 1260-1264
Author(s):  
Guang Ping Yu ◽  
Shan Hui Wang ◽  
Ying Gang Zhou
Keyword(s):  
Measurement Error ◽  
High Resolution ◽  
Capacitive Sensor ◽  
Large Displacement ◽  
Measuring System ◽  
Capacitive Sensors ◽  
Measuring Range ◽  
Measuring Systems ◽  
Basic Principles

Capacitive grating sensor can be used to measure the length, as its capacitance changes with the shift difference. There are several measuring systems consisting of capacitive sensor, but all their basic principles are capacitive differential sensing. The structure, principles and characteristics of capacitive sensors are introduced in this paper. Especially, we designed a high-resolution electronic length measuring system based on Capacitive Grating Sensor. And the measurement error of the system and the reason are analysed. For this system, the measuring range is from 0 to 500mm, the resolution is 1um, the indication error is 5um, the measuring speed is 1m/s. Accurate measurement on account of large displacement is achieved with the system.

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