Noise analysis and device improvement of composite probe for space charge measuring based on PIPWP method

In order to find the source of noise signal which always appears in the process when using the composite probe, this paper proposes a hypothesis which is based on experimental facts. Through the establishing a pressure wave transmission model and analyzing the equivalent circuit, the correctness of the assumption is verified from the perspective of time and amplitude. Finally, the noise signal is moved forward by modifying the structure of the composite probe.