Object processing state sensing using RF radiation

• US 10,088,436 B2
• Filed: 08/30/2012
• Issued: 10/02/2018
• Est. Priority Date: 08/31/2011
• Status: Active Grant

• Current Assignee: Joliet 2010 Limited
• Original Assignee: Goji Limited
• Inventors: Ben Haim, Yuval, Berezin, Maksim, Hadad, Sharon, Libman, Avner, Ron, Amichai, Silcoff, Elliad, Yaari, Igal
• Primary Examiner(s): Kim, Christopher
• Application Number:
  US14/241,583
• Publication Number:
  US 20140247060A1
• Time in Patent Office: 2,224 Days
• Field of Search: 219629, 219630, 219631, 219632, 219635, 219643, 219682, 219690-697, 219702, 219728-731, 219746-750, 219762, 34245, 34248, 34250, 34255, 34259, 34260, 34261, 426107, 426114, 426234
• 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 27/00 Investigating or analysing materials by the use of electric, electrochemical, or magnetic means G01N3/00 – G01N25/00 take precedence; measurement or testing of electric or magnetic variables or of electric or magnetic properties of materials G01R
• CPC Class Codes: G01N 27/04 by investigating resistance
• CPC Class Codes: G06F 15/00 Digital computers in general details G06F1/00 – G06F13/00; Data processing equipment in general
• CPC Class Codes: H05B 6/6441 allowing the input of coded operation instructions, e.g. bar code reader
• CPC Class Codes: H05B 6/6467 using detectors with R.F. transmitters
• CPC Class Codes: H05B 6/6473 combined with convection heating H05B6/6485 takes precedence
• CPC Class Codes: H05B 6/6482 combined with radiant heating, e.g. infrared heating
• CPC Class Codes: H05B 6/6485 further combined with convection heating
• CPC Class Codes: H05B 6/688 for thawing
• CPC Class Codes: H05B 6/705 using microwave tuning
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A method for applying RF energy to detect a processing state of an object placed in an energy application zone, during processing of the object, may include applying RF energy to the object during processing. The method may also include receiving computed RF feedback, correlated with one or more processing states of the object; and monitoring the computed RF feedback during the processing to detect the one or more processing states of the object.

Claims

1. A method for applying RF energy to determine a processing state of an object placed in a cavity having an energy application zone, during processing of the object, the method comprising:

applying RF energy to the object during the processing via at least one radiating element;

receiving RF feedback from at least one detector connected to the at least one radiating element, said RF feedback being indicative of a dielectric response of the cavity and/or the object to electromagnetic (EM) fields excited in the cavity;

mathematically manipulating the RF feedback to obtain computed RF feedback;

determining one or more processing states of the object based on a correlation between the computed RF feedback and the one or more processing states of the object; and

monitoring the computed RF feedback during the applying to monitor the one or more processing states of the object.

2. The method of claim 1, wherein the computed RF feedback comprises one or more results of mathematical manipulation on two or more directly measurable values of the RF feedback.

3. The method according to claim 1, further comprising receiving the correlation between the computed RF feedback and the one or more processing states of the object.

4. The method according to claim 3, further comprising receiving the correlation between the computed RF feedback and the one or more processing states of the object from a memory associated with a controller.

5. The method of claim 4, wherein the controller is configured to cause the applying.

6. The method according to claim 3, further comprising receiving the correlation between the computed RF feedback and the one or more processing states of the object from a machine readable element associated with the object, and using the correlation to determine the one or more processing states of the object.

7. The method according to claim 1, wherein the processing of the object includes applying heat to the object.

8. The method according to claim 7, wherein the applying heat includes applying RF energy to heat the object.

9. The method of claim 8, wherein the applying RF energy includes applying RF energy to heat the object at a first power level and applying RF energy to receive the computed RF feedback at a second power level, the first power level is higher than the second power level.

10. The method of claim 8, wherein the applying RF energy includes applying RF energy to heat the object at a first average amount of energy per excitation setup and applying RF energy to receive the computed RF feedback at a second average amount of energy per excitation setup, the first average amount of energy per excitation setup is higher than the second average amount of energy per excitation setup.

11. The method of claim 1, wherein the computed RF feedback includes results of mathematical manipulation of at least two of reflected energy, coupled energy, incident energy, S parameters, or input impedance.

12. The method of claim 1, wherein the one or more processing states of the object is a phase of the object.

13. The method of claim 1, wherein the one or more processing states of the object is a flow rate of the object.

14. The method of claim 1, wherein the one or more processing states of the object is a pH of the object.

15. The method of claim 1, wherein the object is a food item and the one or more processing states of the object include cooking states.

16. The method of claim 1, further comprising controlling the applying based on the one or more determined processing states of the object.

17. The method of claim 1, wherein the computed RF feedback includes an indication of EM energy absorbability of the object.

18. The method of claim 1, further comprising terminating the processing of the object when the one or more processing states of the object reach a target value.

19. An apparatus for applying RF energy, via at least one radiating element, to determine a processing state of an object placed in a cavity, during processing of the object, the apparatus comprising:

an RF energy application unit configured to apply energy, via the at least one radiating element, to the object in an energy application zone in order to generate RF feedback;

at least one detector connected to the at least one radiating element, said at least one detector being utilized to detect RF feedback indicative of a dielectric response of the cavity and/or the object to electromagnetic (EM) fields excited in the cavity; and

at least one processor configured to;

cause RF energy application by the RF energy application unit;

receive RF feedback from the at least one detector, said RF feedback being indicative of a dielectric response of the cavity and/or the object to electromagnetic (EM) fields excited in the cavity;

mathematically manipulate the received RF feedback to obtain computed RF feedback;

determine one or more processing states of the object based on a correlation between the computed RF feedback and the one or more processing states of the object; and

monitor the computed RF feedback during the processing, to monitor the one or more processing states of the object.

20. The apparatus of claim 19, wherein the at least one processor is further configured to cause application of energy to process the object.

21. The apparatus according to claim 19, wherein the at least one detector is configured to detect directly measurable values of the RF feedback, and wherein the processor is configured to calculate the computed RF feedback based on one or more of the directly measurable values of the RF feedback, and wherein the RF feedback correlated with the one or more processing states of the object is the computed RF feedback.

22. The apparatus according to claim 21, wherein the computed RF feedback includes an indication of EM energy absorbability of the object.

23. The apparatus according to claim 21, wherein the computed RF feedback includes results of mathematical manipulation of at least two of reflected energy, coupled energy, incident energy, S parameters or input impedance.

24. The apparatus according claim 19, wherein the processor is configured to cause application of the RF energy at a plurality of frequency-phase combinations.

25. The apparatus according to claim 19, further comprising at least one heat source to apply heat to process the object.

26. The apparatus according claim 19, wherein the object includes a food item and the one or more processing states include cooking states.

27. The apparatus according to claim 19, wherein the at least one processor is further configured to control the processing based on the determined one or more processing states.

28. The apparatus according to claim 27, wherein the control includes terminating the processing when the one or more processing states reaches a target value.

29. The apparatus according to claim 19, further comprising an interface configured to receive information.

30. The apparatus of claim 29, wherein the information includes an indication of the one or more processing states of the object.

31. The apparatus of claim 29, wherein the information includes at least one energy application protocol.

32. The apparatus according to claim 29, wherein the information is recorded on a machine readable element and the interface is configured to read the information from the machine readable element.

33. A method for processing an object placed in an energy application zone comprising:

applying RF energy, via at least one radiating element, to the object in the energy application zone;

receiving by a processor RF feedback from a sensor located in or around the energy application zone, said RF feedback being indicative of a dielectric response of the cavity and/or object to electromagnetic (EM) fields excited in the cavity;

mathematically manipulating the received RF feedback to obtain computed RF feedback;

monitoring the computed RF feedback during the applying to monitor the processing state of the object based on a correlation between the computed RF feedback and one or more processing states of the object; and

terminating the applying when the computed RF feedback reaches a target value.

34. The method of claim 33, wherein the processing of the object includes applying heat to heat the object.

35. The method of claim 33, wherein the computed RF feedback includes results of mathematical manipulation of at least two of reflected energy, coupled energy, incident energy, S parameters, or input impedance.