Title:
METHOD AND DEVICE FOR GAUGING TANK LEVEL USING DIODE LASER AND OPTICAL FIBER
Document Type and Number:
Japanese Patent JPS5965221
Kind Code:
A
Abstract:
A method for determining the level of the surface of a material in a storage tank or vessel comprising the steps of modulating electrically an optical radiation beam by a radio frequency f, continuously variable over a suitable range, transmitting said beam to the surface of the material, receiving the beam reflected from said surface, adjusting the said frequency in order to obtain phase equality of the modulation in the measurement path in which the beam has travelled to the said surface and the modulation in a reference path in which the beam has not travelled to the said surface and deriving from this adjustment information as to the level in the tank or vessel. The invention also relates to an apparatus for carrying out the above method
Inventors:
JIYON BERUNARUDO KOORU
Application Number:
JP15336983A
Publication Date:
April 13, 1984
Filing Date:
August 24, 1983
Export Citation:
Assignee:
SHELL INT RESEARCH
International Classes:
G01S17/50; G01F23/28; G01F23/292; G01S17/06; G02B6/00; (IPC1-7): G01F23/28; G01S17/06; G02B5/14
Domestic Patent References:
| JPS5181157A | 1976-07-15 | |||
| JPS55146015A | 1980-11-14 |
Attorney, Agent or Firm:
Kazuho Kawarada