Effect of detector size and position on measured vibration spectra of strings and rods

Abstract

The effect of detector size and position on the measured spectra has been investigated and the main characteristics of the transfer function were calculated by using a simple model of standing waves. The theoretical estimation was checked in laboratory rod vibration experiments, and the main features were also found in pressure fluctuation spectra measured at Paks Nuclear Power Station. Fundamental result have been achieved using the theory of the superposition of running waves and their reflection on the clamped ends of the rod.