Diseño e implementación de un sistema de caracterización para microsensores de efecto Hall

Abstract

This paper presents the design and integration of an electrical characterization system for Hall effect microsensors, which allows the detection and measurement of magnetic field perpendicular to the surface of the microsensors. The proposed system can control and maintain the communication of both the position of the excitation source and the magnitude of the magnetic field. This system includes a mechanism for surface movement $\theta $-Z with two degrees of freedom, sensors, electronic instruments, a computer, interface cards and a graphical user interface (GUI) implemented in Lab-View$^{\mbox{\textregistered }}$. The positioning of the system is made through two motors, a stepper motor, and a servomotor. Which perform the movements in the $\theta $-Z surface. The Z axis has a resolution of 0.03 cm through a stepper motor and the $\theta $ axis has a resolution of 1 cm, which is obtained using a servomotor. As excitation source, we used neodymium iron boron (NdFeB) magnet, which has a magnetic field of 100 mT. The detection field is obtained with microsensors which had a response in the linear range of 1 mT to 100 mT. This system allows a single interface through the detection of magnetic field perpendicular to the surface of the microsensor, as well as the positioning of the excitation source in the $\theta $-Z surface. The GUI has a control environment accessible to the end user. Furthermore, the system can be reconfigured for the characterization of other microsensors, changing only the excitation and detection modules. Its versatility will increment the life time of our system characterization.