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Electronics => Open Source Hardware => Topic started by: varno on April 27, 2014, 10:00:40 pm

Title: PCB based B-Field Probe.
Post by: varno on April 27, 2014, 10:00:40 pm
I was talking to a mate over the weekend, and the idea came up that a B-field probe based on a 4-layer PCB might be a cool and inexpensive tool. So, I designed a one in a couple of different sizes. Is anyone else interested in me posting the design files?
Title: Re: PCB based B-Field Probe.
Post by: Harvs on April 28, 2014, 11:01:35 am
Sure just post them.  It's hard to know if I'm interested until I see it  :)

If you're going to, lots of people will be grateful if you put up a PDF or images as well as the design files since everyone uses different EDA packages.

Do you have any measurements against known sources (or compared to known probes) to calibrate the design?
Title: Re: PCB based B-Field Probe.
Post by: T3sl4co1l on April 28, 2014, 03:00:41 pm
Another idea:
http://www.hpe.ee.ethz.ch/uploads/tx_ethpublications/Rogowski_Coil_02.pdf (http://www.hpe.ee.ethz.ch/uploads/tx_ethpublications/Rogowski_Coil_02.pdf)

A Rogowski is for sensing current (the air-cored coil feeds an integrator circuit to produce a signal representative of the enclosed current), but the same idea applies if you're looking to make a spiral or multilayer (external rather than enclosed field) planar coil, transformer or sensor.

Tim
Title: Re: PCB based B-Field Probe.
Post by: Dago on April 28, 2014, 08:30:23 pm
Another idea:
http://www.hpe.ee.ethz.ch/uploads/tx_ethpublications/Rogowski_Coil_02.pdf (http://www.hpe.ee.ethz.ch/uploads/tx_ethpublications/Rogowski_Coil_02.pdf)

A Rogowski is for sensing current (the air-cored coil feeds an integrator circuit to produce a signal representative of the enclosed current), but the same idea applies if you're looking to make a spiral or multilayer (external rather than enclosed field) planar coil, transformer or sensor.

Tim

I saw a similar paper and it looked really interesting so for my next PCB order I'm ordering this (hard to see but its a 4-layer rogowski):

(http://www.dgkelectronics.com/storage/electronics/rogowski/72t_rogowski.png)
Title: Re: PCB based B-Field Probe.
Post by: varno on April 28, 2014, 10:54:55 pm
Here is the pdf design, I am having trouble posting the altium files. The trace is a shorted loop of grounded 50 ohm stripline on the 4-layer oshpark stackup. this design has a 1cm loop diameter. I am going to order them some time this week, i have a split coax that I could do some measurements with however I am not sure how to do the calibrations.
Title: Re: PCB based B-Field Probe.
Post by: eecook on June 04, 2018, 01:58:39 pm
Hi Varno,

Just wanted to check on the status of the project. Do you have any results you might want to share?

Simon.
Title: Re: PCB based B-Field Probe.
Post by: Rerouter on June 04, 2018, 03:22:31 pm
eecook, varno has not been online since september 2017, you may have better luck sending him a private message, Dago however was online just a few days ago

Equally interested in this, these designs seem quite painful to layout in most packages
Title: Re: PCB based B-Field Probe.
Post by: eecook on June 13, 2018, 07:46:41 am
eecook, varno has not been online since september 2017, you may have better luck sending him a private message, Dago however was online just a few days ago

Equally interested in this, these designs seem quite painful to layout in most packages

I found this... http://www.ti.com/tool/TIDA-01063 (http://www.ti.com/tool/TIDA-01063)
It has Altium files and all.
Title: Re: PCB based B-Field Probe.
Post by: CopperCone on June 14, 2018, 03:17:31 pm
I would love to know how that rogawski coil turns out. Winding one is ridiculous. A PCB based one would be good if on a 4 layer board with two shields, so you can cut it out and stick copper tape on the seam

that is like 1000$ otherwise. I have threads about them, they are evil bastards.
Title: Re: PCB based B-Field Probe.
Post by: CopperCone on June 28, 2018, 09:58:36 am
I looked at the schematic more carefully. It does not have a feedback winding around the inside.

How well does this work etched? Why does it have 4 layers (unconnected shield?). I mean the one in the JPG not that one someone designed and posted the PDF for ( I don't like the design of using the PCB as a stick. I would also like to make it so it has the R+C||R on the PCB right against the probe.
Title: Re: PCB based B-Field Probe.
Post by: coppercone2 on August 30, 2018, 08:21:46 am
anyone got any progress?
Title: Re: PCB based B-Field Probe.
Post by: chris_leyson on August 30, 2018, 09:34:11 am
Watching with interest  :popcorn:

The other day I thought it would be handy to have a grid dip meter to look for resonances on PCBs.
As I don't have a dip meter and past attempts at building solid state ones were not all that successful I've decided to build a tube one. Besides, those who have used tube dip meters say they are the most sensitive. I have a few sub-miniature "pencil" 5718 triodes and a few 5702 pentodes so they should be good for UHF if I need it. Going to go for the classic Colpitts arrangement.