| 摘要 |
Probes (13a, 13b) of a conductor length measurement device (10) are connected to piping (23), and an output voltage (Vo) is applied to the piping (23) through the probes (13a, 13b). A frequency spectrum curve is subsequently calculated by subjecting a voltage signal (SV1) to FFT. Resonant frequencies of the piping (23) are then determined from this frequency spectrum curve, and the total length of the piping (23) is calculated on the basis of the resonant frequencies. The total length of the piping (23) can therefore be easily measured without the need to install, for example, any measurement instruments at branch terminals. |
