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About MR sensor

Technical information of MR sensor

Feature

This sensor is made form a magnetic resistance effect element (MR element). The change in the magnetic field and the existence of the magnetic substance can be known as a change in the voltage.
Magnetoresistance...The phenomenon that solid electric resistance changes by the magnetic field.

 

A change in the output voltage and the distance of the MR sensor and the thing detected

It is different from the magnetic head, a MR sensor can get 50% of the signals even if a distance with the detection object leaves 0.3mm.


図2

図3
The temperature characteristic of the MR sensor resistance value

A MR sensor is using InSb of the compound semiconductor. Because of that, that resistance value changes by temperature, and a rate of change is about -2%/C.

 

The temperature characteristic of the MR sensor output voltage

Temperature coeficient is about -0.6 %/deg. (at room temperature)

図4

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