Title:
DEVICE FOR MONITORING LEVEL OF LIQUID IN CRUCIBLE
Document Type and Number:
Japanese Patent JPH05341852
Kind Code:
A
Abstract:
PURPOSE:To stably discriminate the liquid level of a molten metal in a crucible for a long period of time. CONSTITUTION:A metallic vapor generator heats and melts a metallic material 11 stored in a crucible 12 with an electron beam, etc., and generates the metallic vapor. A reflecting mirror 17 is provided to the metallic vapor generator to lead a laser beam 15 onto the surface of the metal in the crucible 12 together with the mirrors 19 and 20 which leads the reflected light 18 received from the surface of the metal to a TV monitor 22, and an image processor 23 which applies the image processing to the output of the monitor 22. Furthermore, this device which monitors the level of the liquid stored in the crucible 12 is provided with the shutters 30 and 31 which are set on the reflecting surfaces of both mirrors 17 and 19 to cut the optical paths with the operations given from the outside of a vacuum container. These shutters 30 and 31 are opened only when the video signals are supplied to the processor 23 and kept closed in an image processing state.
Inventors:
TOKUNAGA KAZUTOSHI
NAKAMURA TAKAMASA
NAKAMURA TAKAMASA
Application Number:
JP15337492A
Publication Date:
December 24, 1993
Filing Date:
June 12, 1992
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
C23C14/54; G05D9/12; (IPC1-7): G05D9/12; C23C14/54
Attorney, Agent or Firm:
Toshiro Mitsuishi (1 person outside)