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US 4,767,982 AGranted
Concentration detection system
AssigneeMaster Chemical Corporation
InventorsH. Keith Florig, David A. Purta
Life of this patent
Estimating the term…
Abstract
A system and method of measuring the concentration of each component of a two component liquid by passing a microwave signal through a flowing liquid sample. A waveguide is used between a microwave source and detector, and a sample tube passes through the central portion of the wave guide.
Claims28
A system for measuring the concentration of each component of a two component liquid comprising, in combination:
- a longitudinally extending metal microwave wave guide;
- a transmitting source located at one end of said wave guide for transmitting a microwave signal through said wave guide;
- a microwave detector located at the other end of said wave guide for receiving said microwave signal;
- a measuring tube extending transversely through said wave guide intermediate its ends;
- means for flowing said liquid through said measuring tube;
- said detector generating an electrical signal which is a function of the microwave signal received from said source through said wave guide, measuring tube and liquid;
- and computer means connected to said microwave detector for computing the concentration of each component in said liquid as a function of said electric signal.
4 more elements
A system for measuring the concentration of each component of a two component liquid comprising, in combination;
- a longitudinally extending metal microwave wave guide;
- a transmitting source located at one end of said wave guide for transmitting a microwave signal through said wave guide;
- a microwave detector located at the other end of said wave guide for receiving said microwave signal;
- a measuring tube extending transversely through said wave guide intermediate its ends;
- enclosure means surrounding said wave guide, microwave source, microwave detector and said measuring tube;
- means for controlling the temperature within said enclosure;
- means for flowing said liquid through said measuring tube;
- means for measuring the temperature of said liquid and generating an electrical signal responsive thereto;
- said detector generating an electrical signal which is a function of the microwave signal received from said source through said wave guide, measuring tube and liquid;
- and circuit means connected to said microwave detector and said temperature detector for computing the concentration of each component in said liguid as a function of said electrical signals.
7 more elements
A method of measuring concentration of a material in a liquid comprising the following steps:
- establishing a flow of liquid to be measured;
- passing the liquid through a measuring tube extending transversely through a microwave wave guide;
- passing a microwave signal from one end of said wave guide through said measuring tube and said liquid flowing therein to the other end of said wave guide;
- detecting the strength of said microwave signal received at the other end of said wave guide and generating a microwave intensity electrical signal responsive thereto;
- and
- generating a liquid concentration signal from said microwave intensity signal.
3 more elements
A system for measuring the concentration of each component in a two component liquid comprising, in combination:
- a longitudinally extending metal microwave wave guide having a rectangular cross-section with a larger width then height;
- a transmitting source located at one end of said wave guide for transmitting a fixed frequency microwave signal through said wave guide;
- a microwave detector located at the other end of said wave guide for receiving said microwave signal;
- a cylindrical measuring tube extending transversely through the width of said wave guide intermediate its ends;
- means for flowing said liquid through said measuring tube;
- means for measuring the temperature of said liquid and generating an electrical signal responsive thereto;
- said detector generating an electrical signal which is a function of the microwave signal received from said source through said wave guide, measuring tube and liquid;
- the diameter of said cylindrical measuring tube being selected to maximize the detector response to change in concentration of said liquid and to minimize the detector response to change in temperature of said liquid;
- and
- circuit means connected to said microwave detector and said temperature detector for computing the concentration of each component in said liquid as a function of said electrical signals.
7 more elements
Dependencies are inferred from the claim text.