On the Realization of a Multifunctional Contactless Sensor

Research areas:

• Volume 3,Issue 4, Jan. 2015

Year:

2015

Type of Publication:

Article

Keywords:

GMR Effect, Contactless Sensor, Flexible Magnetic Stripe, Flexible Installing Function

Authors:

Geeng-Jen Sheu; Ming-Jhe Sie; Meng-Tzong Wu; Chun-Liang Lin

Journal:

IJAIM

Volume:

3

Number:

4

Pages:

112-117

Month:

Jan.-Feb

ISSN:

2320- –

Abstract:

In contrast to the single functioned sensors based on the Hall effect or optical technology, a new multifunctional contactless sensor realized by the giant magneto resistance (GMR) effect is proposed. The sensor unit consists of a flexible magnetic stripe and a GMR detector. The sensor possesses the advantages of diagnosis function, simple structure, low cost, compact size, low power consumption, noise immunity, portability, and flexible installing function. Compared with the traditional optical tachometer, it can be used for measuring rotational speed and translational speed; and possibly used for diagnosis in machines. A high precision linear servo control system has been implemented as a demonstrative platform to verify sensitivity and accuracy of the GMR detector. Our result shows that the error percentage of speed measurement is smaller than 0.004%, which is competitive to the general industrial encoders.

Full text: IJAIM-382_final.pdf