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Development of High-Precision Continuous Scanning Inductance Transducer

Author: GaoLingYan
Tutor: WangLei
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: Precision measurement Roundness instrument Inductive sensors Sensitivity Nonlinear correction
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


Micro-displacement measuring device compared to the capacitive sensor grating sensors, inductive sensors with high sensitivity, good reproducibility, and relatively stable performance advantages, there is a wide range of applications in the the roundness instrument system for ultra-precision machining and measurement occasions . Recent years, in cylindrical and roundness measurements, inductance measurement accuracy of the sensor with the increasingly high demand for the measurement accuracy of the rotary parts more and more people's attention, and its development has become a roundness instrument The major limiting factor of the measuring instruments. The sum of the mechanical structure of the sensor head in order to further improve the accuracy of the measurement of the inductance of the sensor system, it is necessary to adopt two measuring circuit performance improvement at the same time. This this subject in The Institute has developed a sensor system based on its low sensitivity, nonlinear serious problem, and make improvements design and the comparative experimental verification. Of this work: First, starting from the solenoid type coil structure model, based on the principle of Bi Aosafaer electromagnetic field analysis of the sensitivity of the magnetic field characteristics of the coil structure; and from the angle of the magnetic measurements of the electrical conversion circuit to improve the sensitivity studied and analyzed. Effective measures proposed for the improvement of the system sensitivity, the coil structure itself and the specific improvements of the measurement circuit design, such as a coil and the core, material selection, dimensions parameter optimization, the choice of voltage and frequency of the excitation signal source, the range switching modules of the application and so on. Second, by the large number of experiments carried out on the original system, the discovery and analysis of nonlinear problems. Analysis of its influencing factors both from the mechanical structure and the measurement circuit, nonlinear correction method introduced a the nonlinear compensation package for the system, and program for system software program to achieve the system of non-linear correction. Again, for the the positioning problems encountered in the roundness measurement, especially in the measurement system designed sampling trigger control module, time sampling data control, ensure repeatability roundness data acquisition, more reliable evaluation of roundness . Inductive sensor system of comparative experiments, to verify the validity of the improvements made this topic its performance. The experimental results show that the sensitivity of the system to improve more than doubled, the nonlinearity error from 3.4% to 0.41%, also improved system stability and repeatability.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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