Abstract
Currently there are many types of sensors that are used in lots of applications. Among these, magnetic sensors are a good alternative for the detection and measurement of different phenomena because they are a “simple” and readily available technology. For the construction of such devices there are many magnetic materials available, although amorphous ferromagnetic materials are the most suitable. The existence in the market of these materials allows the production of different kinds of sensors, without requiring expensive manufacture investments for the magnetic cores. Furthermore, these are not fragile materials that require special care, favouring the construction of solid and reliable devices. Another important feature is that these sensors can be developed without electric contact between the measuring device and the sensor, making them especially fit for use in harsh environments. In this review we will look at the main types of developed magnetic sensors. This work presents the state of the art of magnetic sensors based on amorphous ferromagnetic materials used in modern technology: security devices, weapon detection, magnetic maps, car industry, credit cards, etc.
Highlights
For a robot to perform tasks such as location and dimensioning of objects in a work place, the action of a sensor is needed
A wide range of magnetic materials is available to build these types of devices, among which amorphous ferromagnetic materials should be highlighted [4,5,6]
A saturated core sensor is a device which uses the periodic saturation of its ferromagnetic core to produce an output signal with harmonic components that are nearly proportional to the device’s external magnetic fields
Summary
For a robot to perform tasks such as location and dimensioning of objects in a work place, the action of a sensor is needed. A wide range of magnetic materials is available to build these types of devices, among which amorphous ferromagnetic materials should be highlighted [4,5,6] Since these materials are available on the market, the production of different kinds of sensors can be realized without the expensive investments needed for the manufacture of their magnetic cores. These sensors are not fragile and do not require special care, which enables the construction of very solid and reliable devices.
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