公开(公告)号：US20180067201A1

公开(公告)日：2018-03-08

申请号：US15812462

申请日：2017-11-14

Applicant: HATCH LTD.

Inventor： Matthew H. CRAMER ,  Afshin SADRI ,  Jennifer ERSKINE ,  David CHATAWAY ,  Bert O. WASMUND ,  Terry GERRITSEN

IPC: G01S13/08 ,  G01F23/284 ,  G01S13/88 ,  F27B3/28

Abstract: A method for determining a length parameter of an electrode during operation of an electric arc furnace. An internal duct extends through the length of the electrode and is open at its lower end. A waveguide having a solid core is received in the internal duct and comprises a material having a low dielectric constant and high temperature resistance. The solid core of the waveguide includes at least one target. An electromagnetic radiation signal is emitted from a source and transmitted through the waveguide and the signal is diffracted and/or reflected from at least one target to produce at least one return signal which is transmitted back through the waveguide. A time or frequency difference between the emitted signal and the return signal is measured and the length parameter is calculated based on this difference.