Object processing state sensing using RF radiation

Patent metadata

Field	Value
Publication number	US-11009468-B2
Application number	US-201816119245-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Aug 31, 2011
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

Apparatus and method for applying RF energy to determine a processing state of an object placed in a cavity, during processing of the object. The method includes applying RF energy to the object during the processing via at least one radiating element, receiving RF feedback from in or around the cavity, 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.

First claim

What is claimed:

1. A method for monitoring a processing state of an object placed in a cavity, the method comprising:
applying RF energy to the cavity via at least one radiating element;
receiving RF feedback from in or around the cavity, said RF feedback being indicative of a dielectric response of the cavity and/or the object to electromagnetic (EM) fields excited in the cavity, said receiving comprising utilizing at least one detector connected to the at least one radiating element;
mathematically manipulating the RF feedback to obtain computed RF feedback;
determining a processing state of the object based on a correlation between the computed RF feedback and 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 according to 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 1 , 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 according to claim 4 , wherein the controller is configured to cause the applying.

6. 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 from a machine readable element associated with the object.

7. The method according to claim 1 , further comprising processing the object.

8. The method according to claim 7 , wherein the processing comprises heating the object.

9. The method according to claim 7 , 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.

10. The method according to claim 7 , wherein the processing includes heating the object via application of RF energy at a first power level and the monitoring includes applying RF energy at a second power level that is lower than the first power level.

11. The method according to claim 7 , wherein the processing includes heating the object via application of RF energy at a first average amount of energy per excitation setup and the monitoring includes applying RF energy at a second average amount of energy per excitation setup that is lower than the first average amount of energy per excitation setup.

12. The method according to claim 7 , further comprising terminating the processing when the one or more processing states of the object reach a target value.

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

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

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

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

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

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

19. An apparatus for determining a processing state of an object placed in a cavity, the apparatus comprising:
an RF energy application unit configured to apply energy, via at least one radiating element, to the cavity in order to generate RF feedback;
at least one detector connected to at least one of 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 the RF feedback from the at least one detector;
mathematically manipulate the received RF feedback to obtain computed RF feedback; and
determine a processing state of the object based on a correlation between the computed RF feedback and one or more processing states of the object.

20. The apparatus of claim 19 , wherein the at least one processor is further configured to monitor the one or more processing states of the object by monitoring the computed RF feedback.

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

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

23. The apparatus of claim 19 , wherein the computed RF feedback includes an indication of EM energy absorbability of the object.

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

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

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

27. The apparatus of claim 26 , wherein the at least one processor is configured to terminate the processing of the object when the one or more processing states of the object reaches a target value.

28. The apparatus of claim 26 , further comprising an interface configured to receive information.

29. The apparatus of claim 28 , wherein the information includes an indication of one or more processing states of the object.

30. The apparatus of claim 28 , wherein the information includes at least one energy application protocol.

31. The apparatus of claim 28 , wherein the information is recorded on a machine readable element and the interface is configured to read the information from the machine readable element.

32. The apparatus of claim 19 , 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.

33. A method for processing an object placed in an energy application zone of a cavity, the method comprising:
during a processing of the object, causing application of RF energy to the object in the energy application zone via at least one radiating element;
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

Assignees

• Goji Ltd

Inventors

• Ben Haim Yuval
• Hadad Sharon
• Libman Avner
• Yaari Igal
• Berezin Maksim
• Silcoff Elliad
• Ron Amichai

Classifications

• H05B6/6482

  combined with radiant heating, e.g. infrared heating · CPC title

• H05B6/705

  using microwave tuning · CPC title

• Y02B40/00

  Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers · CPC title

• H05B6/6441 Primary

  allowing the input of coded operation instructions, e.g. bar code reader · CPC title

• H05B6/6485

  further combined with convection heating · CPC title