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Regarding Creating model for Fluxgate Magnetometer

Posted Jan 20, 2015, 3:48 a.m. EST MEMS & Nanotechnology, MEMS & Piezoelectric Devices 5 Replies

Mohammed Thameemul Ansari
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Hello everyone,

I am designing flux gate magnetometer which consist of primary and secondary coil. According to the principle i have to excite primary coil then i will produce the magnetic field which would be pickup in the secondary coil. So here should i need to use electric current physics to excite the coil or else directly magnetic field physics that have excitation where i can key in my excitation current value.
5 Replies Last Post Apr 8, 2015, 11:45 a.m. EDT
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Hello Mohammed Thameemul Ansari

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Sven Friedel COMSOL Employee

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Posted: 10 years ago Mar 24, 2015, 10:24 a.m. EDT
Hi Mohammed,

for this purpose you should use magnetic fields with time-dependent analysis.
As far as I remember from my studies a fluxgate magnetometer uses the second harmonic
generation. A magnetically nonlinear material is driven into saturation and the actual
measurement signal, proportional to the exterior field, is sensed in a higher harmonic of the base frequency.
This cannot be done with a linear (frequency dependent) or linearized (small-signal analysis)
study that are also provoded by COMSOL. You would need to simulate the device time-dependent just
like our library model of the e-core transformer with a nonlinear core.

ch.comsol.com/model/e-core-transformer-using-multi-turn-coil-domains-14123

With best regards

Sven Friedel
Hi Mohammed, for this purpose you should use magnetic fields with time-dependent analysis. As far as I remember from my studies a fluxgate magnetometer uses the second harmonic generation. A magnetically nonlinear material is driven into saturation and the actual measurement signal, proportional to the exterior field, is sensed in a higher harmonic of the base frequency. This cannot be done with a linear (frequency dependent) or linearized (small-signal analysis) study that are also provoded by COMSOL. You would need to simulate the device time-dependent just like our library model of the e-core transformer with a nonlinear core. https://ch.comsol.com/model/e-core-transformer-using-multi-turn-coil-domains-14123 With best regards Sven Friedel
Mohammed Thameemul Ansari
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Posted: 10 years ago Mar 24, 2015, 10:47 p.m. EDT
Hello Sven Friedel

Thank you very much for your reply. You are right i was using the same library model to compute my results but my problem is in sensitivity. How should i measure the sensitivity of the sensor? According to the theory i have to plot the hysteresis loop to justify my answer. Do you know any other method to calculate the sensitivity of the sensor? Would you please suggest me some way to find this out? Thanks in advance.
Hello Sven Friedel Thank you very much for your reply. You are right i was using the same library model to compute my results but my problem is in sensitivity. How should i measure the sensitivity of the sensor? According to the theory i have to plot the hysteresis loop to justify my answer. Do you know any other method to calculate the sensitivity of the sensor? Would you please suggest me some way to find this out? Thanks in advance.
Sven Friedel COMSOL Employee

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Posted: 10 years ago Mar 25, 2015, 10:54 a.m. EDT
Well, I would define the sensitivity probably as \delta V / \delta B. You might want to derive a curve V(B) measuring the amplitude of the fully developed time dependent solution of the voltage V and the external flux density B. After that, you could differentiate this curve for instance with a spreadsheet program.

Sven
Well, I would define the sensitivity probably as \delta V / \delta B. You might want to derive a curve V(B) measuring the amplitude of the fully developed time dependent solution of the voltage V and the external flux density B. After that, you could differentiate this curve for instance with a spreadsheet program. Sven
Mohammed Thameemul Ansari
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Posted: 10 years ago Apr 8, 2015, 1:59 a.m. EDT
Hello sir

According to my model i have to wound a excitation coil in both sides of the toroidal core which should be connected together. Would you please suggest me how to connect this two coil? Another issue is to coupling with circuit. Therefore, i have to couple the sense/secondary coil with the band pass filter circuit. So my doubt here is how to define the nodes? Here, i have attached the circuit photo.
Hello sir According to my model i have to wound a excitation coil in both sides of the toroidal core which should be connected together. Would you please suggest me how to connect this two coil? Another issue is to coupling with circuit. Therefore, i have to couple the sense/secondary coil with the band pass filter circuit. So my doubt here is how to define the nodes? Here, i have attached the circuit photo.

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Sven Friedel COMSOL Employee

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Posted: 10 years ago Apr 8, 2015, 11:45 a.m. EDT
Please send your COMSOL model - if you do not want to share it in the forum feel free to contact us diorectly through support@comsol.com.

Best regards,
Sven Friedel
Please send your COMSOL model - if you do not want to share it in the forum feel free to contact us diorectly through support@comsol.com. Best regards, Sven Friedel

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

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