IMPEDANCE RESONANCE SENSOR FOR REAL TIME MONITORING OF DIFFERENT PROCESSES AND METHODS OF USING SAME

• US 20130141117A1
• Filed: 11/30/2012
• Published: 06/06/2013
• Est. Priority Date: 12/02/2011
• Status: Active Grant

• Current Assignee: Neovision LLC (Medtronic Plc)
• Original Assignee: Neovision LLC (Medtronic Plc)
• Inventors: Nikolenko, Yury
• Granted Patent: US 8,952,708 B2
• Time in Patent Office: Days
• US Class Current: 324/655
• CPC Class Codes: G01N 27/02 by investigating impedance
• CPC Class Codes: G01N 27/028 Circuits therefor measuring impedance per se G01R27/02
• CPC Class Codes: G01R 15/12 Circuits for multi-testers , i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
• CPC Class Codes: G01R 27/00 Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
• CPC Class Codes: G01R 27/02 Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant by measuring phase angle only G01R25/00
• CPC Class Codes: G01R 27/16 Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
• CPC Class Codes: G01R 27/26 Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables

Abstract

Processes and apparatuses are provided for contactless measuring or monitoring in-situ and in real time composition or other electromagnetic impedance correlated properties of liquid or gaseous substances or bulk materials. One or more apparatus may include a resonance type impedance sensor having at least two coils, at least one coil of the at least two coils being at least one excitation coil connectable to at least one alternating current source with frequency sweep, at least one other coil of the at least two coils being at least one sensing coil connectable to at least one data processing system. The one or more methods may include calculating changes in amplitude and resonant frequency induced by electromagnetic interaction between said sensor and object to determine impedance of said object under test; and matching said impedance with predetermined calibration data to determine said chemical or physical properties of said object under test.

Claims

1. An apparatus for contactless measuring or monitoring, in-situ, in-line and/or in real time, composition and/or other electromagnetic impedance correlated properties comprising at least one of level, density, moisture, and ionization of one or more liquid and/or gaseous substances and/or one or more bulk materials, comprising:

at least one resonance type impedance (“

IR”

) sensor which is a multicoil open-core or air-core inductor, said sensor comprising at least two coils, at least one coil of the at least two coils being at least one excitation coil connectable to at least one alternating current source with frequency sweep, at least one other coil of the at least two coils being at least one sensing coil connectable to at least one data processing system, wherein;

(i) upon electrical connection to said current source, said at least one excitation coil is capable of propagating an energy to said at least one sensing coil, which is capable of generating a probing electromagnetic field, (ii) said at least one sensing coil is designed in such a way that intrinsic inductance L, capacitance C, and resistance R parameters of said at least one sensing coil are capable of providing resonance conditions for measuring impedance of an object under test or at least a portion of said object under test being disposed within a sensing area of said at least one sensing coil at a predetermined frequency range; and

(iii) said at least one sensing coil uses only its intrinsic (distributed) capacitance and is not connected to any capacitance means such that said at least one sensing coil is capable of measuring at least one of conductance, conductivity and one or more dielectric properties of said object under test or at least said portion of said object under test being disposed within the sensing area of said at least one sensing coil;

at least one power supply;

at least one radio frequency (“

RF”

) sweep generator, the at least one RF sweep generator being electrically connected to at least one said excitation coil;

at least one data acquisition block, the at least one data acquisition block being electrically connected to;

(i) at least one said excitation coil, (ii) at least one said sensing coil, or (iii) to both said excitation and sensing coils;

at least one calculation block; and

at least one communication block.

2. The apparatus of claim 1, wherein said least one data acquisition block has high electrical input impedance.

3. The apparatus of claim 2, wherein said least one data acquisition block has electrical input impedance greater than 10 MΩ

or substantially greater than 10 MΩ

.

4. The apparatus of claim 1, wherein said object under test is capable of being at least one of conductive, semi-conductive and non-conductive.

5. The apparatus of claim 1, wherein said at least one data acquisition block operates to be electrically connected to at least one said excitation coil and to register change of current in an excitation circuit comprising said at least one radio frequency (“

RF”

) sweep generator and said at least one excitation coil.

6. The apparatus of claim 1, wherein said at least one data acquisition block operates to be electrically connected to at least one said excitation coil and to register change of voltage in an excitation circuit comprising said at least one radio frequency (“

RF”

) sweep generator and said at least one excitation coil.

7. The apparatus of claim 1, wherein said at least one data acquisition block operates to be electrically connected to at least one said excitation coil and to register change of both current and voltage in an excitation circuit comprising said at least one radio frequency (“

RF”

) sweep generator and said at least one excitation coil.

8. The apparatus of claim 1, wherein said at least one data acquisition block operates to be electrically connected to said at least one excitation coil and to said at least one sensing coil, said at least one sensing coil being electromagnetically coupled with said excitation coil, where:

(i) at least one data acquisition unit of said at least one data acquisition block registers change of current and voltage in an excitation circuit, the excitation circuit comprising said at least one radio frequency (“

RF”

) sweep generator, said at least one excitation coil, and at least one instrument shunt resistor, by measuring a drop of potential on said shunt resistor; and

(ii) at least one other data acquisition unit of said at least one data acquisition block registers voltage on said at least one sensing coil.

9. The apparatus of claim 1, wherein said at least one sensing coil is immersible in, or is placed near or adjacent to, said object under test and/or a vessel or container having said object under test therein in order to benefit from at least one change of a distributed capacitance, and/or turn-to-turn capacitance, of said at least one sensing coil.

10. The apparatus of claim 9, wherein said at least one immersible sensing coil is coated with dielectric film to avoid any direct contact with at least one of liquid, gas and bulk material.

11. The apparatus of claim 9, wherein said at least one sensing coil and said at least one excitation coil are electromagnetically coupled with each other and are immersible in, or are placed near or adjacent to, said object under test and/or a vessel or container having said object under test therein.

12. The apparatus of claim 11, wherein at least one of said at least one immersible sensing coil and said at least one immersible excitation coil is coated with dielectric film to avoid any direct contact with at least one of liquid, gas and bulk material.

13. The apparatus of claim 9, wherein said at least one sensing coil is located inside of a vessel or pipe and immersed into said object under test, and said at least one excitation coil, which is electromagnetically coupled with said at least one sensing coil, encompasses said vessel or pipe.

14. The apparatus of claim 13, wherein said at least one immersible sensing coil is coated with dielectric film to avoid any direct contact with liquid, gas, or bulk material.

15. The apparatus of claim 1, wherein said IR sensor(s) is(are) designed to measure and/or monitor at least one of:

(i) one or more liquids and/or one or more gaseous solutions including at least one of;

any lubricating product(s) used in operation of at least one of;

any combustion engine, turbine and/or wind mill, and one or more electrical pumps in order to detect deterioration of one or more predetermined oil/fuel parameters including at least one of;

soot content, metal particle(s), and change of viscosity;

any fuel(s) and/or cooling substance(s);

any gaseous substance(s) used to control any production process including heating, cooling, deposition or removal of films in semiconductor fabrication processes;

any liquid and/or gaseous substance(s) used to control one or more medical and/or laboratory procedures and/or tests

any liquid and/or gaseous substance(s) used to control at least one of;

(a) one or more manufacturing processes for one or more pharmaceuticals, drugs and/or medicines; and

(b) one or more testing and/or final testing of said one or more pharmaceuticals, drugs and/or medicines; and

any type of drinking or process water;

(ii) one or more quality metrics of slurry during a chemical mechanical planarization (CMP) process in order to replace or adjust a liquid mixture chemical composition to be in conformance with an industrial process based upon one or more detected changes in a tested liquid mixture, the one or more quality metrics including at least one of;

(a) monitoring one or more abrasive properties of the slurry, (b) detecting particle size distribution (PSD), (c) large particle counts (LPC), (d) an oxidizer concentration, and (e) density; and

(iii) one or more quality metrics of any industrial liquid chemical composition in order to replace or adjust a liquid mixture chemical composition to be in conformance with an industrial process based upon one or more detected changes in a tested liquid mixture.

16. The apparatus of claim 1, wherein said IR sensor(s) is(are) designed to measure and/or monitor moisture and analyte concentration of one or more bulk materials, the one or more bulk materials including at least one of:

one or more agricultural bulk material products;

one or more chemical bulk material products;

one or more soils; and

one or more building bulk materials.

17. The apparatus of claim 14, wherein at least one of:

(i) the one or more agricultural bulk material products include at least one of one or more seeds, sugar, and flour;

(ii) the one or more chemical bulk material products include at least one of one or more salts, one or more fertilizers, and one or more pesticides;

(iii) the one or more soils include at least one of one or more sands and one or more clays; and

(iv) the one or more building bulk materials include at least one of one or more sands and cement.

18. A method of measuring and/or monitoring conductive, semiconductive or non-conductive objects under test using the apparatus of claim 1, the method comprising:

(A) measuring, at the same time, either;

(i) self-resonance frequency and amplitude of said sensor(s);

or (ii) amplitude and phase shift at a fixed frequency;

(B) placing an object under test comprising at least one analyte or having at least one target or predetermined property;

(C) measuring, at the same time, either;

(i) resonant frequency and amplitude of said sensor(s) in the presence of said object under test;

or (ii) amplitude and phase shift at a fixed frequency in the presence of said object under test;

(D) calculating one or more changes in amplitude and resonant frequency induced by electromagnetic interaction between said sensor and said object under test to determine impedance of said object under test; and

(E) matching said impedance with predetermined calibration data to determine one or more chemical or physical properties or said target or predetermined property of said object under test.

19. The method of claim 18, wherein said predetermined calibration data are prepared using one or more etalon samples.