| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily and accurately detect whether or not the whole part or one part of a control part in equipment to be electronically controlled is altered without decomposing the control part. SOLUTION: A wire harness is connected between a control part and an operating mechanism part in equipment to be electronically controlled, and the wire harness is allowed to function as an antenna for transmission when the control part is operated, and radio waves are emitted to the outside part. The leakage radio waves are received by an antenna 2 of a radio receiver 3, and a signal related with the leakage radio waves sampled by the radio receiver 3 is fetched by a spectrum analyzer 4, and the spectrum of the leakage radio waves is analyzed, and a detected spectrum with frequencies as a horizontal axis and the strength of an electric signal as a vertical axis is generated, and this spectrum is compared with the preliminarily obtained spectrum of radio waves leaking from the control part whose non-altered is confirmed, that is, a reference spectrum, and when there is any difference between them, it is decided that the control part of equipment to be inspected is altered.</p> |
