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Effect of Inductive Coil Shape on Sensing Performance of Linear Displacement Sensor Using Thin Inductive Coil and Pattern Guide
Electrical and Electronic Engineering Department, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Malaysia
Malaysian France Institute, Universiti Kuala Lumpur, Section 14, Jln. Teras Jernang, 43650 Bandar Baru Bangi, Malaysia
Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
* Author to whom correspondence should be addressed.
Received: 27 September 2011; in revised form: 25 October 2011 / Accepted: 25 October 2011 / Published: 3 November 2011
Abstract: This paper discusses the effect of inductive coil shape on the sensing performance of a linear displacement sensor. The linear displacement sensor consists of a thin type inductive coil with a thin pattern guide, thus being suitable for tiny space applications. The position can be detected by measuring the inductance of the inductive coil. At each position due to the change in inductive coil area facing the pattern guide the value of inductance is different. Therefore, the objective of this research is to study various inductive coil pattern shapes and to propose the pattern that can achieve good sensing performance. Various shapes of meander, triangular type meander, square and circle shape with different turn number of inductive coils are examined in this study. The inductance is measured with the sensor sensitivity and linearity as a performance evaluation parameter of the sensor. In conclusion, each inductive coil shape has its own advantages and disadvantages. For instance, the circle shape inductive coil produces high sensitivity with a low linearity response. Meanwhile, the square shape inductive coil has a medium sensitivity with higher linearity.
Keywords: linear displacement sensor; inductive coil; pattern guide; meander shape; triangular type meander shape; square shape; circle shape; inductance; sensitivity; linearity
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Misron, N.; Ying, L.Q.; Firdaus, R.N.; Abdullah, N.; Mailah, N.F.; Wakiwaka, H. Effect of Inductive Coil Shape on Sensing Performance of Linear Displacement Sensor Using Thin Inductive Coil and Pattern Guide. Sensors 2011, 11, 10522-10533.
Misron N, Ying LQ, Firdaus RN, Abdullah N, Mailah NF, Wakiwaka H. Effect of Inductive Coil Shape on Sensing Performance of Linear Displacement Sensor Using Thin Inductive Coil and Pattern Guide. Sensors. 2011; 11(11):10522-10533.
Misron, Norhisam; Ying, Loo Qian; Firdaus, Raja Nor; Abdullah, Norrimah; Mailah, Nashiren Farzilah; Wakiwaka, Hiroyuki. 2011. "Effect of Inductive Coil Shape on Sensing Performance of Linear Displacement Sensor Using Thin Inductive Coil and Pattern Guide." Sensors 11, no. 11: 10522-10533.