Method for sensor reader calibration

• US 9,389,296 B2
• Filed: 03/15/2013
• Issued: 07/12/2016
• Est. Priority Date: 07/26/2012
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Potyrailo, Radislav Alexandrovich, Forster, Ian James
• Primary Examiner(s): Hollington, Jermele M
• Assistant Examiner(s): McAndrew, Christopher
• Application Number:
  US13/838,884
• Publication Number:
  US 20140028327A1
• Time in Patent Office: 1,215 Days
• Field of Search: 324/633
• US Class Current: 1/1
• CPC Class Codes: A61B 2560/0219 of externally powered implanted units
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: G01N 22/00 Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more G01N3/00 - G01N17/00, G01N24/00 take precedence
• CPC Class Codes: G01N 22/04 Investigating moisture content
• CPC Class Codes: G01N 27/023 where the material is placed in the field of a coil
• CPC Class Codes: G01N 27/026 Dielectric impedance spectroscopy electrochemical impedance spectroscopy for measuring corrosion G01N17/02
• CPC Class Codes: G01N 33/0006 Calibrating gas analysers
• CPC Class Codes: G01N 33/0073 Control unit therefor
• CPC Class Codes: G01R 35/005 Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references G01R33/0035, G01R35/002 take precedence

Abstract

In one embodiment a method for sensor reader calibration comprising: performing a calibration of a sensor reader wherein the calibration comprises open circuit calibration, a short circuit calibration, and a load circuit calibration, or any combination thereof in any succession; enabling connection of a pickup coil to the sensor reader to measure a sensor response; and applying a baseline correction to the sensor response, wherein the baseline correction is obtained utilizing measurements from the calibration step. In a further embodiment, a method for sensor response calibration incorporating environmental correction comprising: measuring a first resonance impedance spectrum of the sensor with a first applied power to the pickup coil; measuring a second resonance impedance spectrum of the sensor with a second applied power to the pickup coil; and applying a correction to the sensor response corresponding to the respective measured first and second resonance impedance spectrum to mitigate for environmental parameters.

Claims

1. A method for calibration of a sensor response, the method comprising:

calibrating a sensor reader, the sensor reader calibration comprises an open circuit calibration, a short circuit calibration, and a load circuit calibration, or any combination thereof in any succession;

calibrating a sensor using the sensor reader, wherein the sensor calibrating is configured for environmental correction, the sensor calibration comprising;

measuring at least two sensor responses of the sensor at at least two applied powers to the sensor reader, wherein each sensor response of the at least two sensor responses corresponds to one of the at least two applied powers; and

applying a correction to the sensor responses by comparing reference responses of the sensor corresponding to the at least two applied powers to the sensor responses obtained at the measuring step, wherein the correction mitigates for environmental parameter changes affecting the sensor responses.

2. The method of claim 1, wherein the open circuit calibration is obtained by taking a measurement within the sensor reader when leads from the sensor reader are in an open position and the measurement is taken across the open leads prior to electrical connection of a pickup coil of the sensor reader.

3. The method of claim 1, wherein the short circuit calibration is obtained by taking a measurement within the sensor reader when leads from the sensor reader are connected as a short circuit prior to electrical connection of a pickup coil of the sensor reader.

4. The method of claim 1, wherein the load circuit calibration is obtained by taking a measurement within the sensor reader and the measurement is taken across a predetermined broadband resistor connected to leads from the sensor reader prior to electrical connection of a pickup coil of the sensor reader.

5. The method of claim 1, wherein the correction to the sensor responses comprises subtraction of a frequency response of a pickup coil of the sensor reader over an optimal range for the sensor.

6. The method of claim 1, wherein the correction to the sensor responses removes the effects of a pickup coil of the sensor reader on the sensor responses by mathematical correction.

7. The method of claim 1, wherein the sensor reader calibration is configured to minimize inaccuracies of the sensor reader response originating from ambient conditions.

8. The method of claim 1, wherein the sensor calibration further comprises:

measuring at least two reference responses of the sensor, each reference response corresponds to one of the at least two sensor responses; and

determining stability of sensor responses over time by comparing each of the at least two sensor responses obtained at the measuring step to the corresponding reference response, wherein each of the at least two sensor responses and the corresponding reference response are measured at one of the at least two applied powers at different times.

9. The method of claim 1, wherein the correction further comprises:

measuring at least two reference responses of the sensor, each reference response corresponds to one of the at least two sensor responses, wherein each of the at least two sensor responses and the corresponding reference response are measured at one of the at least two applied powers; and

correcting each of the at least two sensor responses obtained at the measuring step to correspond to value of the corresponding reference response.

10. A method for calibration of a sensor response, the sensor response calibration incorporating environmental correction, the method comprising:

calibrating a sensor reader, the sensor reader calibration comprises an open circuit calibration, a short circuit calibration, and a load circuit calibration, or any combination thereof in any succession;

calibrating a sensor using the sensor reader, wherein the sensor calibrating is configured for environmental correction, the sensor calibration comprising;

measuring a first sensor response of the sensor with a first applied power to the sensor reader;

measuring a second sensor response of the sensor with a second applied power to the sensor reader; and

applying a correction to the sensor responses by comparing reference responses of the sensor corresponding to the first and second applied power to the sensor responses obtained at the measuring step, wherein the correction mitigates for environmental parameter changes affecting the sensor responses.

11. The method of claim 10, wherein the correction further comprises:

measuring a first and a second reference response of the sensor, each reference response corresponds to one of the at least two sensor responses, wherein each of the at least two sensor responses and the corresponding reference response are measured at one of the at least two applied power; and

correcting each of the at least two sensor responses obtained at the measuring step to correspond to value of the corresponding reference response.

12. The method of claim 10, wherein the sensor is attached to an integrated circuit chip.

13. The method of claim 12, wherein one of the first and second applied power is utilized to operate the integrated circuit chip in at least one of a silent mode and other modes wherein the integrated circuit chip is either fully or partially operating.

14. The method of claim 12, wherein the integrated circuit chip is switched on or off based on the presence of a threshold environmental parameter(s) so as to calibrate the sensor response to mitigate for such environmental parameter(s) changes affecting the sensor responses.

15. The method of claim 10, wherein the correction further comprises comparing polynomial fit coefficients to the sensor responses and values of the corresponding reference responses of the sensor.

16. A method for calibration of a sensor response, the method comprising:

calibrating a sensor reader, the sensor reader calibration comprises an open circuit calibration, a short circuit calibration, and a load circuit calibration, or any combination thereof in any succession;

calibrating a sensor using the sensor reader, wherein the sensor calibrating is configured for environmental correction, the sensor calibration comprising;

measuring a sensor response in at least one controlled condition;

measuring a first sensor response proximal to a first material;

measuring a second sensor response proximal to a second material; and

applying a correction to the sensor responses by comparing reference responses of the sensor corresponding to the first and the second material to the sensor responses obtained at the measuring step, wherein the correction mitigates for environmental parameter changes affecting the sensor responses.

17. The method of claim 16, wherein the sensor is a multivariable resonant sensor.

18. The method of claim 16, wherein controlled conditions comprises:

the sensor in air;

the sensor in an inert atmosphere such as nitrogen, argon, or dry air;

the sensor in an atmosphere without the presence of an analyte of interest, and any other conditions which result in a known sensor response.

19. The method of claim 16, wherein the first material and second material include any material that has differing values of complex permittivity.

20. The method of claim 16, wherein the first and second materials are selected from at least one of Teflon, polycarbonate, polyurethane, polyisobutylene, ethyl cellulose, polyepichlorihydrin silicone, cyanopropylmethly phenymethyl silicon, dicyanaollyl silicon, BaTiO₃, BaTiSnO₃, Cu₃Ti₄O₁₂, Ca₂Nb₄O₁₂, and any combinations thereof.