Physics Asked by Er.rht on June 5, 2021
Anyone know how can i design antenna for electric field detection. i m trying to make contactless Ac mains Detector which range is near about 1-mtr long.
my question is about possibility of antenna construction for electric field sensor. but as i calculate the wavelength (for 50hz) is around 6*10^6km its mean the antenna height (lambda/4) is equal to 1500km long. so this is very difficult to construct. i need some pcb mounted antenna for that. is anyone have an idea please help me out.
this can be easily done by making your "antenna" in the form of a loop consisting of many turns of wire, surrounding the AC mains line. This coil then becomes the secondary winding of a transformer in which the AC mains line is the primary. For this to work, only the HOT line of the two-wire AC mains should go through the loop- NOT both of the lines, and a load (like a small heater, etc.) must be connected to the AC mains, so that current will be flowing.
You can buy a tool called a clip-on ammeter probe which is a miniature version of what I have just described. You then connect the output plug of the clip-on probe to the input of an oscilloscope, on which you can monitor the mains signal.
Answered by niels nielsen on June 5, 2021
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