I know that is possible to measure it by the SAR (Specific absorption rate) method, but I’m seeking a more practical way to do so or a device that can measure it.
If there is none, is there any theoretic method to measure EMF?
Sar can be calculated by measuring the electric field and using the relation SAR = segmaE^2/density
Sar can be calculated by measuring the electric field and using the relation SAR = segmaE^2/density
The given relation by issam concernd the radiated power by the poyting vector evrn if it s callef SAR. Really, SAR depends on one hand on the radiated field but on other hand on the receiver nature (body brain head hand skin tissue). Even if SAR can be estimated by simulators , the antennas to be certofied
How to find the SAR command line is shown in my answer to tanghid rachid question
The electromagnetic waves at a certain location has specific power density called the paintings vector. If one has an electromagnetic source radiating power Prad, then its density at distance d will be Prad/4pi d^2 , where it is assumed that it is isotropic radiator. The radiation power density can be measured using radio electro magnetic radiation detector composed of an antenna, a LNA and and a root mean square detector such as a junction FET or a MOSFET. The antenna can be as simple as a loop antenna.
There are powerful low noise amplifiers with a wide band width. You can use also a spectrum analyzer to obtain the frequency spectrum of the electromagnetic waves.
There is now what is called radio frequency spectrum sensing:Article DEVELOPING FRONT END WIDEBAND SPECTRUM SENSOR FOR COGNITIVE RADIO
which are used to sense the elecromagnetic radiation.
Best vwishes
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