G - Physics – 01 – F
Patent
G - Physics
01
F
73/58
G01F 23/28 (2006.01) G01F 23/292 (2006.01)
Patent
CA 1218867
A B S T R A C T A METHOD AND APPARATUS FOR OPTICAL TANK GAUGING 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 frequency f, transmitting said beam to the surface of the material through a first transmitting means S1, receiving the beam reflected from said surface through a first receiving means D1 and coupling optically the said means S1 and D1 to a second transmitting means S2 and a second receiving means D2 respective- ly in such a way that permanent optical coupling exists between S1 and D2, S2 and D1 and S2 and D2 respectively, and further comprising the step of detecting the phases of the outputs of the first and second receiving means D1 and D2 respectively and deriving from this detection information as to the level in the tank or vessel. An apparatus for determining the level of the surface of a material in a storage tank or vessel comprising means for modu- lating electrically an optical radiation beam by a frequency f, and comprising a first and a second means S1 and S2 respective- ly for transmitting an optical radiation beam, the said first means S1 being adapted to transmit its beam to the surface of the material, and further comprising a first and a second means D1 and D2 respectively for receiving an optical radiation beam, the said first means D1 being adapted to receive the beam reflected from said surface, whereas the first and second trans- mitting means S1 and S2 and the first and second receiving means D1 and D2 are connected in such a way that permanent optical coupling exists between S1 and D2,S2 and D1 and S2 and D2 respectively, and further comprising means for detecting the phases of the outputs of the said first and second receiving means D1 and D2 respectively and means for deriving from this detection information as to the level in the tank or vessel.
447007
Shell Canada Limited
Smart & Biggar
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