Bottom reflector for a radar-based level gauge
First Claim
1. A bottom reflector for a radar-based level gauge, which measures a level of a liquid stored in a tank by means of transmitting a microwave signal towards the surface of the liquid from the top of the tank, receiving the microwave signal as reflected against the surface of the liquid, and calculating the level of the liquid stores in the tank from the propagation time of the transmitted and reflected microwave signal, said bottom reflector being mountable at a predetermined height in said tank for reflecting the microwave signal when no liquid is present at said predetermined height in the tank, wherein said bottom reflector comprises a reflecting structure having a first reflection coefficient for said microwave signal when the level of the liquid is above the reflecting structure and a second reflection coefficient for said microwave signal when the level of the liquid is below the reflecting structure, said first reflection coefficient being substantially lower than said second reflection coefficient.
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Accused Products
Abstract
A bottom reflector for a radar-based level gauge, which measures a level of a liquid stored in a tank by means of transmitting a microwave signal towards the surface of the liquid from the top of the tank, receiving the microwave signal as reflected against the surface of the liquid, and calculating the level of the liquid from the propagation time of the transmitted and reflected microwave signal, wherein the bottom reflector is adapted to be mounted close to the bottom of the tank and comprises a reflecting structure having a first reflection coefficient for the microwave signal when the level of the liquid is above the reflecting structure and a second reflection coefficient for the microwave signal when the level of the liquid is below the reflecting structure, wherein the first reflection coefficient is substantially lower than the second reflection coefficient.
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Citations
54 Claims
- 1. A bottom reflector for a radar-based level gauge, which measures a level of a liquid stored in a tank by means of transmitting a microwave signal towards the surface of the liquid from the top of the tank, receiving the microwave signal as reflected against the surface of the liquid, and calculating the level of the liquid stores in the tank from the propagation time of the transmitted and reflected microwave signal, said bottom reflector being mountable at a predetermined height in said tank for reflecting the microwave signal when no liquid is present at said predetermined height in the tank, wherein said bottom reflector comprises a reflecting structure having a first reflection coefficient for said microwave signal when the level of the liquid is above the reflecting structure and a second reflection coefficient for said microwave signal when the level of the liquid is below the reflecting structure, said first reflection coefficient being substantially lower than said second reflection coefficient.
- 47. A bottom reflector for a radar-based level gauge, which measures a level of a liquid stored in a tank by means of transmitting a microwave signal towards the surface of the liquid from the top of the tank, receiving the microwave signal as reflected against the surface of the liquid, and calculating the level of the liquid stored in the tank from the propagation time of the transmitted and reflected microwave signal, said bottom reflector being mountable close to the bottom of said tank for reflecting the microwave signal when no liquid is present in the tank, wherein said bottom reflector comprises a reflecting structure having a first reflection coefficient for said microwave signal when the level of the liquid is above the reflecting structure and a second reflection coefficient for said microwave signal when the level of the liquid is below the reflecting structure, said first reflection coefficient being lower than a reflection coefficient of the surface of said liquid for said microwave signal.
- 51. A bottom reflector for a radar-based level gauge, which measures a level of a liquid stored in a tank by means of transmitting microwaves towards the surface of the liquid from the top of the tank, receiving the microwaves as reflected against the surface of the liquid, and calculating the level of the liquid stored in the tank from the propagation time of the transmitted and reflected microwaves, said bottom reflector being mountable close to the bottom of said tank for reflecting the microwaves when no liquid is present in the tank, wherein said bottom reflector comprises a reflecting structure which rotates the polarization of the reflected microwaves differently when the level of the liquid is above the reflecting structure as compared to when the level of the liquid is below the reflecting structure.
Specification