| 摘要 |
PURPOSE:To remove noises in a measuring system, by passing a detection signal of an acoustic emission generated from a rotor through a parallely branched waveform processing circuit into which a waveform parameter is inputted. CONSTITUTION:An acoustic emission (AE) signal is detected with a sensor 2 from a bearing 1 or the like. The signal is applied to a multiplexer 7 through a filter 4, a threshold level setting circuit 6 and the like and inputted continuously into a parallely branched waveform processing circuit 8 in distribution. The waveform processing circuit 8 is so formed that a plurality of waveform parallel meters, for example, DELTAt, N, Vp/DELTAt and the like when the time to the peak is represented by DELTAt, the number of cycles N and the peak value Vp. Thus, the AE signal can be distinguished from noises by waveform parameters thereby enabling accurate measurement of the AE value by removing the noises. |
