A beat-product radio imaging method system uses a matched continuous wave transmitter and receiver to electronically image material in between. Before forming the source electrode and the drain electrode, a crystalline silicon film for relaxing the stress is formed, then a contact hole connecting to the semiconductor film of the thin film transistor is opened, and a metal film to be the source electrode and the drain electrode is formed. The active connection causes the second plunger to be displaced when the first plunger is moved and vice versa.