펄스파 자왜 센서를 이용한 고정밀 액위 센서 시스템의 실현에 관한 연구

다국어 초록 (Multilingual Abstract)

In this paper, we introduce the implementation of high accurate level sensor system using the pulse wave type magnetostriction sensor. When a current pulse flows along the waveguide, the magnetic field also propagates towards the end of waveguide. When this magnetic field just passes the position of the magnet for level detection, the resultant magnetic field by these two magnetic fields makes a torsional reflected signal. This is used to calculate the time difference between a interrogation pulse wave and this torsional reflected signal. The key elements and characteristics were investigated to implement level sensor system based on this principle. We introduce a method to calculate the speed of ultrasonic reflected signal and how to make a model of sensing coil. In particular, we experiment with the characteristics of the torsional reflected signal according to the changes of the interrogation voltage and displacement. To make high accurate level sensor system, two methods were compared. One is to use the comparator and time counter, the other is STFT(Short Time FFT) which is capable of the time-frequency analysis.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 자왜 센서의 기본 원리
• 3. 실험 및 고찰
• 4. 결론
• 참고문헌

참고문헌 (Reference)

1 Chang Xiaoming, "The Study on the Fixed End Wave in Magnetostrictive Position Sensor" 1 : 81-84, 2010

2 Woo-Jin Choi, "The Implementation of Magnetostrictive Type Level Sensor System using Guided Pulse Wave" 2206-2209, 2012

3 Wang Zheng, "Study on Impulse Magnetic Field of Magnetostrictive Position Sensor" 2 : 933-936, 2010

4 David S. Nyce, "Linear Position Sensors: Theory and Application" John Wiley & Sons, Inc. 2004

5 Mei Yuan, "Key Technology of Magnetostrictive Fuel Sensor" 1000-1005, 2006

6 Marc T. Thompson, "Inductance Calculation Techniques" 25 (25): 40-45, 1999

7 Fernando Seco, "Improving the Accuracy of Magnetostrictive Linear Position Sensors" 58 (58): 722-729, 2009

8 Edward M. Purcell, "Electricity and Magnetism" McGraw-Hill, Inc. 1985

9 Yongjie Zhang, "Design of Compensation Coils for EMI Suppression in Magnetostrictive Linear Position Sensors" 12 : 6395-6403, 2012

10 A. G. Olabi, "Design and application of magnetostrictive material" 29 : 469-483, 2007

11 Yongjie Zhang, "Design and Analysis of Differential Waveguide Structure to Improve Magnetostrictive Linear Position Sensors" 11 : 5508-5519, 2011