If you reposition and re-shape the eddy current-inducing coil so that it horizontally laid out (instead of the vertical orientation), the eddy currents are induced and stretched-out over a larger surface area of the metal. You end up with horizontally-oriented eddy current in the metal layer. We then position a vertically-oriented static magnetic field. Since the 90 degree cross of electric (eddy) current with a magnetic field results in the Lorentz force, the charged particles in the metal are coherently accelerated by the Lorentz force. Our horizontally-oriented eddy current coil is fed with very high frequency (RF). The result is - immense accelerations of the charged particles in the metal. Our test device consists of ten layers of aluminum foil, each layer separated by insulation. The thickness of the aluminum foil has a 'skin depth' for a frequency of 10 Mhz. Very nice, very clear explanation of eddy currents - thank you!

Thanks a lot sir.. I am Anjali from India🇮🇳

What you are going to have to do is to get a "standard" set up with the conditions that you are looking for so that way you can fine tune your instrument to get calibrated for those particular scenarios. I would start with a higher frequency and then work my way down until I could see all of the indications that I were looking for. Thanks Joe

Thanks! very good explanation.

great chennal to khow the hvac technology, thank sir.

Yes and no, it just really depends on what you are looking for. Eddy Currents can test for discontinuities below the surface of a material, it just has to be set up to do that or else you will not see what you are looking for. Are you looking for something specific?

Amazing

How to calculate the eddy current and force well and truly？

why not DC or permanent magnets, also is the effect the same if you rotate the magnets around a fixed aluminum plate. Regards Les

@Cowleyelearning

7 жыл бұрын

Les,Yes you are correct, if you use a permanent magnet, you could use an aluminum plate, but the key is that you are going to have to continually change the magnetic field so that you actually generate the eddy currents in the plate.Hope that helps!ThanksJoe

Is X and Y sensitivity the same as Vertical and Horizontal gain?

@JClasenCowleyNDT

10 жыл бұрын

Yes it is, it depends on what type of machine you have, Uniwest machines are set up that way. joe

Could you please clarify why the eddy currents are circular?

@JClasenCowleyNDT

10 жыл бұрын

Sudeb, They are circular because as the magnetic fields exit the probe in a circular fashion, they have to follow the shape of the field that created them and at an orientation 90º to the magnetic fields. If that doesn't help, I can help explain by conversation, Feel free to email me if you have any more questions - clasenj@cowley.edu

@jesseinfinite

10 жыл бұрын

understood, thank you sir.

please turn on your light ok