System and method for heating an item in a microwave oven

Patent metadata

Field	Value
Publication number	US-12022597-B2
Application number	US-202017620915-A
Country	US
Kind code	B2
Filing date	Jun 22, 2020
Priority date	Jun 21, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

Provided is a system and method for heating an item in a microwave oven. The method includes capturing, with at least one electromagnetic field sensor, at least one electromagnetic field measurement of a microwave chamber, each electromagnetic field measurement of the at least one electromagnetic field measurement corresponding to a region in the microwave chamber, generating an electromagnetic field map of the microwave chamber based on the at least one electromagnetic field measurement, capturing, with at least one sensor, a plurality of thermal measurements of the item being heated in the microwave chamber, each thermal measurement of the plurality of thermal measurements corresponding to a region on the item, and controlling at least one of a position of the item and the electromagnetic field while the item is being heated in the microwave chamber based on the electromagnetic field map and the plurality of thermal measurements.

First claim

The invention claims is:

1. A method for heating an item in a microwave oven comprising:
capturing, with at least one electromagnetic field sensor, at least one electromagnetic field measurement of a microwave chamber, each electromagnetic field measurement of the at least one electromagnetic field measurement corresponding to a region in the microwave chamber;
generating an electromagnetic field map of the microwave chamber based on the at least one electromagnetic field measurement;
capturing, with at least one sensor, a plurality of thermal measurements of the item being heated in the microwave chamber, each thermal measurement of the plurality of thermal measurements corresponding to a region on the item; and
controlling at least one of a position of the item and the electromagnetic field while the item is being heated in the microwave chamber based on the electromagnetic field map and the plurality of thermal measurements.

2. The method of claim 1 , further comprising arranging at least one microwave susceptor on the item.

3. The method of claim 1 , wherein controlling the electromagnetic field comprises arranging at least one microwave shield in the microwave chamber.

4. The method of claim 1 , wherein generating the electromagnetic field map comprises:
applying an electromagnetic field to at least one neon light located within the microwave chamber;
sensing, with at least one photo-sensor, a light emission by the at least one neon light; and
estimating the electromagnetic field based on a location of the at least one neon light and at least one of a flashing frequency and a brightness of the at least one neon light.

5. The method of claim 4 , wherein the at least one photo-sensor is located outside of the microwave chamber and the light emission by the at least one neon light is transferred outside of the microwave chamber through a fiber optic cable.

6. The method of claim 1 , wherein controlling at least one of a position of the item and the electromagnetic field further comprises:
comparing the plurality of thermal measurements to a desired heating pattern;
determining a difference between the plurality of thermal measurements and the desired heating pattern;
determining an estimated change in an electromagnetic field strength required to reduce the difference based on the electromagnetic field and a calculated future temperature; and
adjusting the electromagnetic field based on the estimated change.

7. The method of claim 6 , further comprising continuously comparing the plurality of thermal measurements to the desired heating pattern.

8. The method of claim 6 , wherein the desired heating pattern is a uniform temperature for each of the plurality of thermal measurements.

9. The method of claim 6 , wherein the desired heating pattern is predetermined based on a type of item placed within the microwave chamber.

10. The method of claim 1 , wherein the item is arranged on a turntable within the microwave chamber, and wherein controlling the position of the item comprises altering at least one of the rate of rotation and the direction of rotation of the turntable.

11. A system for heating an item in a microwave oven, the system comprising:
at least one electromagnetic field sensor configured to capture at least one electromagnetic field measurement of a microwave chamber, each electromagnetic field measurement of the at least one electromagnetic field measurement corresponding to a region in the microwave chamber;
generating, with at least one processor, an electromagnetic field map of the microwave chamber based on the at least one electromagnetic field measurement;
at least one sensor configured to capture a plurality of thermal measurements of the item being heated in the microwave chamber, each thermal measurement of the plurality of thermal measurements corresponding to a region on the item; and
controlling, with at least one processor, at least one of a position of the item and the electromagnetic field while the item is being heated in the microwave chamber based on the electromagnetic field map and the plurality of thermal measurements.

12. The system of claim 11 , further comprising arranging at least one microwave susceptor on the item.

13. The system of claim 11 , wherein controlling the electromagnetic field comprises arranging at least one microwave shield in the microwave chamber.

14. The system of claim 11 , wherein generating the electromagnetic field map comprises:
applying an electromagnetic field to at least one neon light located within the microwave chamber;
sensing, with at least one photo-sensor, a light emission by the at least one neon light; and
estimating, with at least one processor, the electromagnetic field based on a location of the at least one neon light and at least one of a flashing frequency and a brightness of the at least one neon light.

15. The system of claim 14 , wherein the at least one photo-sensor is located outside of the microwave chamber and the light emission by the at least one neon light is transferred outside of the microwave chamber through a fiber optic cable.

16. The system of claim 11 , wherein controlling at least one of a position of the item and the electromagnetic field further comprises:
comparing, with at least one processor, the plurality of thermal measurements to a desired heating pattern;
determining, with at least one processor, a difference between the plurality of thermal measurements and the desired heating pattern;
determining, with at least one processor, an estimated change in an electromagnetic field strength required to reduce the difference based on the electromagnetic field and a calculated future temperature; and
adjusting, with at least one processor, the electromagnetic field based on the estimated change.

17. The system of claim 16 , further comprising continuously comparing the plurality of thermal measurements to the desired heating pattern.

18. The system of claim 16 , wherein the desired heating pattern is a uniform temperature for each of the plurality of thermal measurements.

19. The system of claim 16 , wherein the desired heating pattern is predetermined based on a type of item placed within the microwave chamber.

20. The system of claim 11 , wherein the item is arranged on a turntable within the microwave chamber, and wherein controlling the position of the item comprises altering at least one of the rate of rotation and the direction of rotation of the turntable.

21. The system of claim 16 , wherein the desired heating pattern comprises a plurality of temperatures corresponding to a plurality of points on a surface of the item, wherein the plurality of temperatures comprises at least two different temperatures.

22. The system of claim 11 , wherein generating the electromagnetic field map comprises:
applying an electromagnetic field to at least one dipole antenna located within the microwave chamber;
converting, with at least one rectifier, an electric current emitted by the at least one dipole antenna to a direct current; and
estimating the electromagnetic field based on a location of the at least one dipole antenna and the direct current of the at least one dipole antenna.

23. The system of claim 11 , wherein the item is arranged on a 6 DoF platform within the microwave chamber, and wherein controlling the position of the item comprises altering at least one of the following: a longitudinal location, a latitudinal location, an ele

Assignees

• Univ Carnegie Mellon

Inventors

• Hong Jason I
• Jin Haojian
• Kumar Swarun Kumar Suresh
• Wang Jingxian

Classifications

• H05B6/76

  Prevention of microwave leakage, e.g. door sealings · CPC title

• H05B6/72

  Radiators or antennas · CPC title

• H05B6/68

  for monitoring or control · CPC title

• H05B6/70

  Feed lines · CPC title

• H05B6/6447 Primary

  Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors · CPC title