抄録
Process tomography system was developed by detecting a displacement current induced by an electrically charged particle. The intensity of displacement current was confirmed by comparing the experimental signals with those calculated from a numerical solution of electrical field generated by an electrically charged particle. Without any adjustment factor, the estimated signals showed a good agreement with the experimental data in both time domain and signal intensity, suggesting that the induced signal is predictable by the numerical analysis and the sensor can be designed and optimized solely by numerical analyses. Fourier transform was applied to extend the single electrically charged particle model to multiple particle system. The Fourier spectra of displacement currents from multiple particles were conserved to those from superimposed many displacement currents. From the retrieved individual displacement current, it was possible to obtain the particle velocity and the amount of electrical charge carried by the particle. Furthermore, the detection system of charged particle’s position with an array of sensors was developed based on the concept of ‘circle of Appolonius’.
