DRV5023: DRV5023

nelson thomas

Prodigy 10 points

Part Number: DRV5023

why are magnetic sensors linear if magnetic force is inverse square? i need a magnetic sensor

that has inverse square output voltage. does TI are anyone produce such a sensor?

i would appreciate your help.

thank you,

nelson

over 7 years ago

0 Harsha Munikoti over 7 years ago

TI__Expert 5705 points

Hello Nelson,

I apologize but I don't understand your question.

Invariably "magnetic sensors" sense the applied magnetic field by measuring the magnitude of the flux density it creates in a region around the sensor. These sensors do not measure the force produced by the magnetic field.

The underlying principle of operation is Faraday's Law of Induction. So the output voltage of the sensor is necessarily linear with respect to changes in the applied magnetic flux density.

Having said that, it would be helpful if you could share specific details about your application. Most importantly, what are you trying to measure that has an "inverse-square" relationship to the flux density applied to the magnetic sensor?

Best Regards,
Harsha

0 RE over 7 years ago

TI__Mastermind 20985 points

Hi Nelson,

You are correct that the strength of a magnetic field changes non-linearly with distance. A linear Hall sensor simply converts flux density into a voltage. It's up to the controller to interpret it. The non-linear change versus distance will change system-to-system, depending on the magnet's shape and movement. If the controller uses a look-up table with calibration, high accuracy is possible.

Best regards,
RE

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DRV5023: DRV5023