Design of a Bioelectrical Impedance Spectrometer Based on AD5933

2012 ◽  
Vol 239-240 ◽  
pp. 392-396
Author(s):  
Ke Ning Wang ◽  
Heng Zhao ◽  
Wei Wang
Keyword(s):  
Measurement Error ◽  
Impedance Spectroscopy ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Impedance Measurement ◽  
Bioelectrical Impedance ◽  
I2c Bus ◽  
Working Principle ◽  
Machine Interface ◽  
Impedance Converter

This paper designed a bioelectrical impedance spectroscopy (BIS) measurement system based on the integrated impedance converter AD5933. The working principle of the AD5933 was briefly introduced, and a bipolar BIS measurement device was designed. The AD5933 can be controlled by MCU STC89LE516AD through an I2C bus. The software of the BIS device was written in C51 language and provides a friendly human-machine interface. Preliminary experiment showed that the impedance measurement error at different frequencies is less than 3% and found that the measurement accuracy is relatively high for larger resistor.

Design of a Portable Bioelectrical Impedance Measurement System

2011 ◽  
Vol 365 ◽  
pp. 409-414
Author(s):  
Yi Lu ◽  
Cheng Yu Huo ◽  
Ai Jun He
Keyword(s):  
Biomedical Research ◽  
Measurement System ◽  
Low Cost ◽  
Impedance Measurement ◽  
Bioelectrical Impedance ◽  
Usb Bus ◽  
Measurement Devices ◽  
Digital Demodulation ◽  
Electrode Technique ◽  
Impedance Converter

Bioelectrical impedance measurement is a widely used biomedical detecting technology. However, most traditional bioelectrical impedance measurement devices are bulky, expensive and lack of flexibility. In order to reduce costs, increase flexibility and maintain similar performance, a portable bioelectrical impedance measurement system was designed in this paper. The measurement front, with an ARM based microcontroller and integrated impedance converter chip as its core device, communicated with the host computer via USB bus. Based on the four-electrode technique, DFT digital demodulation and software calibration and compensation algorithm, the system realized its functions. Experimental results indicate that the system can achieve high precision bioelectrical impedance measurement. With the advantage of high integration and low-cost, the system can be widely used in household healthcare, clinics and biomedical research and testing.

Design and Development of Embedded Grinding Initiative Meter

2013 ◽  
Vol 401-403 ◽  
pp. 1014-1018
Author(s):  
Guan Qing Ren ◽  
Lin Na Zhang ◽  
Peng Zheng
Keyword(s):  
Embedded System ◽  
High Performance ◽  
Measurement Accuracy ◽  
Hardware Platform ◽  
Multithreaded Programming ◽  
Design Program ◽  
Measurement Control ◽  
Working Principle ◽  
Machine Interface ◽  
Software And Hardware

For development of a high-performance grinding initiative Meter, this paper proposes an approach based on embedded system. The initiative Meter uses ARM9 microprocessor as hardware-platform and Windows CE 5.0 as operating system. It mainly describes the working principle and software and hardware design program in this article. It accelerates the speed of operation, enhances the real-time of measurement control, improves the measurement accuracy of initiative Meter through the adoption of high-performance microprocessor and multithreaded programming technology, and at the same time has good man-machine interface. The initiative Meter adopts touch screen operation, parameters of it can easily adjusted and set. According to the test, the embedded initiative Meter has a high performance in various aspects, it will have abroad market prospects for its higher ratio of performance to price.

A Design Based on Bioimpedance Spectroscopy Method in Human Abdominal Adipose Measurement System

2012 ◽  
Vol 263-266 ◽  
pp. 241-245 ◽  
Author(s):  
Zhang Yong Li ◽  
Fei Ba Chang ◽  
Xiao Bo Chen ◽  
Rui Leng ◽  
Wei Wang
Keyword(s):  
Measurement System ◽  
Current Source ◽  
Impedance Measurement ◽  
Bioelectrical Impedance ◽  
Abdominal Fat ◽  
Signal Generator ◽  
Constant Current ◽  
Phase Detection ◽  
Bioimpedance Spectroscopy ◽  
Constant Current Source

This article describes a measurement of human abdominal fat device designed based on BIS (bioimpedance spectroscopy), the device adopts four electrodes multi-frequency bioelectrical impedance measurement system, including the programmable signal generator module and the amplitude and phase detection module. Program controlled signal generator module can generate the high output impedance of the constant current source in the eight frequency points constant current source between 5KHz and1MHz; amplitude phase detecting module can detect the human body electrical impedance real part and imaginary part information. Therefore, the device can be accurate measurement of human abdominal impedance information in the whole frequency range. Meanwhile, according to the selected electrode fixed position and the appropriate measurement scheme, can calculate the corresponding depth of abdominal fat content.

scholarly journals A High-Precision Method for Dynamically Measuring Train Wheel Diameter Using Three Laser Displacement Transducers

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4148 ◽  
Author(s):  
Fajia Zheng ◽  
Bin Zhang ◽  
Run Gao ◽  
Qibo Feng
Keyword(s):  
Measurement Error ◽  
Measurement System ◽  
High Speed ◽  
Measurement Accuracy ◽  
Field Experiments ◽  
Interaction Force ◽  
Simple Method ◽  
Repeatability Error ◽  
Displacement Transducers ◽  
Multi Body

Wheel diameter is a significant geometric parameter related to the safe operation of trains, and needs to be measured dynamically. To the best of the authors’ knowledge, most existing dynamic measurement methods and systems do not meet the requirement that the wheel diameter measurement error for the high-speed vehicle is less than 0.3 mm. In this paper, a simple method for dynamically and precisely measuring train wheel diameter using three one-dimensional laser displacement transducers (1D-LDTs) is proposed for the first time, and a corresponding measurement system which was developed is described. The factors that affect the measurement accuracy were analyzed. As a main factor, rail deformation caused by the wheel-rail interaction force at low (20 km/h) and high (300 km/h) speeds was determined based on the combination of multi-body dynamics and finite element methods, and the effect of rail deformation on measurement accuracy is greatly reduced by a comparative measurement. Field experiments were performed to verify the performance of the developed measurement system, and the results of the repeatability error and measurement error of the system were both less than 0.3 mm, which meets the requirement of wheel diameter measurements for high-speed vehicles.

Design of a measurement system for use in static balancing a two-axis gimbaled antenna

2014 ◽  
Vol 228 (13) ◽  
pp. 2530-2541 ◽  
Author(s):  
WX Yan ◽  
ST Zhan ◽  
ZY Qian ◽  
Z Fu ◽  
YZ Zhao
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Measurement Accuracy ◽  
Key Factors ◽  
Measurement Principle ◽  
Working Principle ◽  
Control Configuration ◽  
Major Factors ◽  
Two Degree Of Freedom ◽  
Novel Design

The two-axis gimbaled antenna’s performance can be greatly improved if it is statically balanced. This paper intends to present a novel design of a measurement system for use in statically balancing a two-axis gimbaled antenna mounted on an aircraft. The details of the measurement system and its working principle are explained, including the dynamics of the two-degree-of-freedom flexure-hinge leverage and the control configuration of the measurement system. The measurement principle is proposed after the theoretical measurement uncertainties estimated and the key factors that determine the measurement accuracy are found. By controlling the uncertainty induced from the major factors, the measurement accuracy can be finally controlled. The measurement result is proved sufficiently accurate by means of High-speed centrifuge method.

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