How can i measure high magnetic fields?

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Discussion Overview

The discussion centers around the measurement of high magnetic fields in the range of 1T to 2T, focusing on the challenges of finding suitable sensors, particularly Hall sensors, and exploring alternative measurement methods.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant, Misiak, is seeking a Hall sensor capable of measuring a 1T magnetic field with an accuracy of 0.1 mT and is open to other measurement methods.
  • Another participant suggests using a rotating search coil as a potential solution.
  • A third participant shares a link to a resource on precise magnetic field measurement, although its direct applicability is questioned.
  • Some participants argue that a rotating coil magnetometer can measure both AC and DC fields and can be designed for various field strengths.
  • One participant proposes using the magnetic field to bend an electron beam as an alternative measurement method, suggesting the use of a magnetic shunt to reduce the field at the sensor for calibration purposes.
  • Concerns are raised regarding the accuracy of Hall probes, with one participant noting difficulties in achieving the desired accuracy and suggesting that NMR might be a more reliable method based on their experience with Hall probes.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and accuracy of Hall sensors for high magnetic field measurements, with some supporting the use of rotating coils and others advocating for NMR as a more reliable alternative. The discussion remains unresolved regarding the best approach to measure high magnetic fields accurately.

Contextual Notes

Participants highlight limitations in the accuracy of Hall probes and the challenges of measuring voltages at high precision. There are also unresolved questions about the practicality of implementing suggested methods within specific systems.

Misiak
Hello!

I've made a lot of research about measurement of high magnetic fields - such us 1T - 2T and I can't find sensors for this range.
I'm looking for a hall sensor with which I will be able to measure 1T magnetic field with good accuracy - about 0.1 mT. Do you know about anything like that? The best for me will be sensor which is using some magistral to communicate.
Or maybe you know about another methods of measurement magnetic fields like that?Best regards
Misiak
 
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Rotating search coil .
 
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Nidum said:
Rotating search coil .
I can't see how can I add this to my system. And in addition, the electromagnes which I need to measure is supply with DC so probably the rotating coil won't work there.
 
A rotating coil magnetometer will work with AC or DC fields . They can be designed to measure a wide range of field strengths and can be made in small sizes if needs be .
 
Nidum said:
Rotating search coil .
How about using the field to bend an electron beam? The spot position on a CRT could indicate the field strength. That's an equivalent to the Hall effect.
Then what about using a magnetic shunt to reduce the field at the sensor? That could be a cheap solution but would need calibrating.
 
It will be hard to find a Hall probe that will do this. You're asking for 500 ppm accuracy, and a) none of the devices proposed do that, b) ultimately a Hall probe gets you a Hall voltage and measuring voltages to this accuracy is difficult, and c) a Hall probe measures the field along one direction. This is essentially at the extreme upper end of what is possible. You will probably have to go to NMR.

I tried to do just this with a 1.5T magnet and failed - multiple Hall probes were in disagreement with each other and not reproducible. NMR did much better.
 

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