| 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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