Maximum detectable distance between magnet and magnetometer

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Discussion Overview

The discussion revolves around calculating the maximum detectable distance between a magnet and a magnetometer, specifically using a single-component magnetometer with a resolution of 60nT and an N52 magnet with a volume of 1 cm³. Participants explore the appropriateness of the formula used for this calculation and the underlying principles of magnetic field detection.

Discussion Character

  • Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant presents a calculation for the maximum distance (Z) using a specific formula and values related to the N52 magnet and magnetometer resolution.
  • Another participant questions the source of the formula used, noting that it differs from typical equations for bar magnets.
  • Some participants suggest that the formula may be a different numerical approximation and encourage further research on the magnetic field due to a bar magnet along the axial line.
  • It is mentioned that the magnetic force decreases with the cube of the distance, indicating a fundamental principle that may affect the calculations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the validity of the formula used for the calculation, with multiple competing views regarding its appropriateness and the need for further verification.

Contextual Notes

The discussion highlights potential limitations in the provided formula, including a lack of reference to its source and the need for clarity on the assumptions made in the calculations.

siavosh1
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Hi Dear,
I have a single-component (Z-Axis) magnetometer with 60nT resolution.
I want to calculate the maximum distance that this magnetometer can detect an N52 magnet with a volume of 1 cm³.
So I used the following formula and inserted the values, and finally calculated the Z:

https://forum.allaboutcircuits.com/attachments/blockequation-png.257032/
Br = 1.47 T (for Magnet N52)
B= 60 nT (magnetometer resolution)
L=W=D=10mm
Z=?
My answer => Z= 1.579 m
Keep in mind that I intended to solve this problem in the simplest possible way; the angle of view of the magnetometer is perpendicular to the magnet plate.
https://forum.allaboutcircuits.com/attachments/blockmagnet-png.257033/
My question is whether I have chosen the right formula? or do you suggest another solution for it.
 
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Welcome to PF.
Where did you get that block equation from ?
 
Does anyone have any idea about this?
 
There is no reference with the calculator to the source of the equation linked.
The formula is of a different form to that normally given for a bar magnet.
It may be correct. It may simply be a different numerical approximation.
Google; magnetic field due to bar magnet on axial line
 
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It's important to recognize that the magnetic force varies in inverse proportion to the cube of the distance.
 

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