Electronics > Beginners
Two Dimensional EMF detector
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BrentonS:
Hi.

I would like to build a device that creates a two-dimensional image of high voltage power lines by detecting the electromagnetic field.
I have an idea how to achieve this, but i'm not sure if it is physically possible.

The 50Hz EMF would be measured with a phased array grid of antenna elements, amplify/filter each element and convert to digital.
Apply calculated delays and sum the elements to "scan" across and down. Display the data by equating signal strength at each point to a range of colours.

Wavelength = speed of light / frequency = 299792 km/s / 50 Hz = 5996km

Is there a lower frequency limit for phased arrays?
As the wavelength of 50Hz is so large, i'm thinking the spacing of the elements would be impractical.
http://www.rfcafe.com/references/electrical/ew-radar-handbook/images/img153.gif

If 50Hz is too low, would it be possible to use this method to detect harmonics within the 50Hz signal?

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