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    • 1. 发明专利
    • DE69024540T2
    • 1996-09-12
    • DE69024540
    • 1990-06-06
    • MITSUBISHI ELECTRIC CORP
    • NAKAGAWA TAKAFUMINAKATA SHUHEIHIFUMI TAKASHI
    • H05H7/00
    • An apparatus for detecting the position of a charged particle in a duct pipe has a plurality of electrodes (2, 3, 4, 5) arranged in the duct pipe. Detection signals obtained in the electrodes are phase-delayed by predetermined amounts and then added (24) to form an integral detection signal. The integral detection signal is input to a circuit (14, 25 to 33) which determines waveforms representative of the passage of the charged particle: namely, the D.C. component of the detection signal, fundamental wave component and a phase-shifted fundamental wave component. The position of the charged particle are determined from these components. A part of each eleotrode (2, 3, 4, 5) is formed of a dielectric member (37). Each electrode and an associated connector (17) are covered by a double-shield structure (18, 39) with inner and outer shields, the electrode, the connector and the inner shield being electrically insulated from the duct pipe (18).