Explain the working principal of EDM with a neat sketch.

Explain the working principal of EDM with a neat sketch. 
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Answer :

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Let the distance between P and Q be ‘D’ which is to be measured.

A wave is transmitted from the transmitter at station ‘P’ with certain phase angle. . There is a reflector at the other end ‘Q’ .Reflector consist of prism. The wave strikes on reflector at Q and then gets reflected from Q.

It is received back at the transmitter end at ‘P’ with different phase angle. For. finding the distance, the phase difference between transmitted wave and reflected wave is measured and converted into distance.

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