TMAG3001: 3D Magnetic Hall Sensor ,TMAG3001 measuring range and Resolution Confirmation.

Priya Konda

Part Number: TMAG3001

Tool/software:

Dear Team,

We are looking for 3D hall technology for linear displacement measurement of crack on walls, that relies on Texas 3D Hall-effect sensor TMAG3001 for high-precision.

1. Displacement Range & Resolution
Based on our magnetic field simulations (using the TMAG3001 in “slide-by” mode with a 2 mm × 2 mm N48 cylindrical magnet and a 3 mm air gap), we calculate:

Linear range: 0 – 2 mm
Resolution: 1.2 µm

Could you please confirm whether these figures align with the sensor’s typical performance under the specified configuration? or there is better sensor for this application which gives resolution in micrometer range?

4 months ago

0 Alicia Rosenberger 4 months ago

TI__Genius 13770 points

Hi Priya,

Thank you for posting to the Sensors forum!

In terms of performance, we generally spec our devices in terms of how accurate the read will be for magnetic fields, not distance as distance tends to be super system specific. For example, for the A1 device with the ±37mT magnetic field range, the device has a sensitivity of 885LSB/mT (or ~1.123μT/LSB). Additionally, we also spec the noise performance of the device along with the offset, etc.

Tools like TIMSS, which allows you to simulate the magnetic field of the magnet as it moves in relation to our sensors, is a great way to see the expected device output from our sensors in relation to the magnet's movement.

Additionally, the following application note, linked below, does a great job explaining how hall-effect sensors can be used to track linear displacement.

https://www.ti.com/lit/ab/sbaa513b/sbaa513b.pdf

Best,

~Alicia