Dear Peter,

In order to measure the radiation intensity at different location or the spatial distribution of the electromagnetic field you can small coils as a sensing device of the time varying magnetic field. You can calibrate the induced voltage of the function of the magnetic field flux.

You can use also the Hall generator device to sense the magnetic field component of the electromagnetic waves from the wireless transmission radiator.

In principles antennas can be used to pick up the radiation intensity.

Best wishes

Dear Peter,

In order to measure the radiation intensity at different location or the spatial distribution of the electromagnetic field you can small coils as a sensing device of the time varying magnetic field. You can calibrate the induced voltage of the function of the magnetic field flux.

You can use also the Hall generator device to sense the magnetic field component of the electromagnetic waves from the wireless transmission radiator.

In principles antennas can be used to pick up the radiation intensity.

Best wishes

To capture the signal you can use either DSO or spectrum analyzer or any other display with inductive coils or else wire antennas.

Thank you very much Prof. Anveshkumar Nella for the answer. I will try that method.

Prof. Abdelhalim Zekry , thank you for the wonderful tip. As you said, if I placed a solenoid with N number of turns and A coil area, and measure the induced current across the coil at different spots in the vicinity of my system, then flux in tesla can be calculated as phi = B.A; B= u. n. I . (B= field intensity, n = N/L; L=length of solenoid). Right?

Dear Peter,

Welcome

you use the law of magnetic induction:

The voltage induced in a coil with number of turn N = N d phi/ dt where phi is the magnetic flux in the core of the coil. The flux phi= B A, with B is the magnetic induction and A is the core area of the coil.

As phi will be sinusoidal then dphi/dt= w phi, where w is the frequency.

So, finally we have

V the induced voltage in the coil= N w B A. By measuring V and knowing all other parameters of the coil, one can calculate B,

B= V/ NwA,

For the Faraday law please see the link: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html

Best wishes

Thank you Prof. Abdelhalim Zekry for the information. So with a simple circuit, we can measure the emf radiation. I have attached a functional diagram for the same inspiring from the above information. It should work, right?

Dear Peter,

welcome again,

Okay, very fine! I would like to pay your attention that the magnetic flux must be oriented in the direction of the axes of the detection coil.

Also you have to make the coil small that it can resolve the spatial variations of the magnetic field.It would be great when you report about your experiment.

Wish you success.

Respected Prof. Abdelhalim Zekry ,

Thank you once again, sir. I will update you once the working prototype is finished.

The spectrum and its applications use to be lessons that have been painfully learned through history.

I think for 200 kHz a linear Antenna can be used. To find all the equations needed use Kraus book (Antennas).

Thank you Ziad Sobih for the information. But what if we used an aluminium/ copper coil to measure the induced emf magnitude?

Hi Peter

for measuring electromagnetic flux density you can use EMF probe , actually, I'm using Narda EMF probe ( Narda 8511 High Frequency RF Compliance Survey Meter 300 Khz-100 MHz EMF Gauss). There are many types you can select suitable one for your current and future works.

I hope that useful for you

regards

Elnail

You can make your own sensing coil, or use a commercial one. Narda probes are widely used for wireless charging system for EV, however, those are costly.

An alternative option is using a cheaper magnetic sensor, which is also a well equipped sensing coil. I have used the following one, which can be directly connected with a oscilloscope.

http://www.magneticsciences.com/mc162/

However, this shows only the field component parallel to the probe. Therefore, you might need to take three measurement to get the X, Y, Z components.

If you use a circular or rectangular coil, measuring only the Z component of the B-field would be sufficient. However, if you are using a DD pad, you need to measure all three component.

Reference: You can see some of the results I have put in my attached paper. I hope it will help.

Gauss Meter SPECTRAN NF-5030 could be good for your problem. I have used this device to measure the EMI level for the dynamic charging test rig. You can see the experimental results in the following paper:

Article A High-Power Multiphase Wireless Dynamic Charging System wit...