Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Dielectric constant estimation device and microwave heating apparatus provided with dielectric constant estimation device

A technology of microwave heating device and dielectric constant, which is applied in the direction of microwave heating, electric heating device, electric/magnetic/electromagnetic heating, etc., to achieve the effect of efficient heating treatment and non-uniform heating treatment

Pending Publication Date: 2020-11-10
PANASONIC HLDG CORP
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the dielectric constant of the object is not known in advance and the temperature change of the dielectric constant of the object caused by heating is not known in advance, the optimal electromagnetic field distribution for the object cannot always be formed in the heating chamber, and there is no way to control the object. Efficient heat treatment without heating unevenness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dielectric constant estimation device and microwave heating apparatus provided with dielectric constant estimation device
  • Dielectric constant estimation device and microwave heating apparatus provided with dielectric constant estimation device
  • Dielectric constant estimation device and microwave heating apparatus provided with dielectric constant estimation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0093] figure 1 It is a diagram for explaining the principle of operation of the permittivity estimating device according to Embodiment 1 of the present invention. First, use figure 1 A method of discriminating dielectrics using microwaves will be described.

[0094] exist figure 1 , schematically depicts TE waves (transverse electric waves: transverse electric waves) and TM waves that irradiate polarized waves of electromagnetic waves to objects to be measured (5A / 5B) with the same dielectric constant (εn) and different thicknesses (X1 / X2). Wave (transverse magnetic wave: transverse magnetic wave) each reflected wave.

[0095] figure 1 (a) schematically shows the state of reflected waves when the object 5A having a dielectric constant of "εn" and a thickness of "X1" is irradiated with TE waves and TM waves of polarized waves of electromagnetic waves. figure 1 (b) shows the state of reflected waves when the object 5B having a dielectric constant of "εn" and a thickness of...

Embodiment approach 2

[0167] Image 6 It is a block diagram showing a schematic configuration of a microwave heating device according to Embodiment 2 of the present invention. exist Image 6 The shown microwave heating device is configured to include the permittivity estimating device of the first embodiment described above. In the description of Embodiment 2, elements having the same functions, structures, and operations as those described in Embodiment 1 are given the same reference numerals, and descriptions thereof are sometimes omitted in order to avoid redundant descriptions.

[0168] Image 6 The microwave heating device according to Embodiment 2 shown is a heating cooker represented by a microwave oven, and has a heating chamber 13 as a storage portion (measurement area MA) of the dielectric constant estimating device in the main body of the device. The microwave oscillation unit 14 configured using a semiconductor element generates desired microwaves (for example, 2.4 GHz to 2.5 GHz) in...

Embodiment approach 3

[0181] Figure 7 It is a block diagram showing a schematic configuration of a microwave heating device including a dielectric constant estimating device according to Embodiment 3 of the present invention. In the description of Embodiment 3, elements having the same functions, structures, and operations as those described in Embodiments 1 and 2 are given the same reference numerals, and descriptions thereof are sometimes omitted in order to avoid redundant descriptions.

[0182] Figure 7 The microwave heating apparatus according to Embodiment 3 shown is configured to include the permittivity estimating device described in Embodiment 1, and is provided with a plurality of heating chambers 13 that are placed in the storage section (measurement area MA). The microwave heating antenna (microwave emitting part) 15 (15a, 15b) for inductively heating the object 5 to be heated. In the microwave heating device according to Embodiment 3, a structure in which one pair (two) of microwav...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

In order to provide a dielectric constant estimation device whereby the dielectric constant of an object can be estimated with high precision without contact with the object even when the shape of theobject is uncertain, and a microwave heating apparatus provided with the dielectric constant estimation device, a dielectric constant estimation device according to the present invention is configured so that a transmission antenna (4) and a reception antenna (6) are provided whereby the polarization of electromagnetic waves can be switched between TE waves and TM waves, a TM / TE reflection ratiois calculated on the basis of reflected TE waves and reflected TM waves from an object, the calculated TM / TE reflection ratio and dielectric constant data of theoretical values compiled as a databasestored in advance in a memory unit (10) are compared, and the dielectric constant of the object is estimated.

Description

technical field [0001] The present invention relates to a permittivity estimating device for estimating the permittivity of an object in a non-contact manner, and a microwave heating device for inductively heating an object to be heated using the permittivity estimating device. Background technique [0002] In recent years, a microwave heating device having a semiconductor element has been proposed as a microwave generating device instead of a generally used magnetron. A microwave generator using a semiconductor element is compact, can be manufactured at low cost, and has advantages in that the oscillation frequency of microwaves can be easily adjusted (for example, refer to Patent Document 1). [0003] In a microwave heating device having such a microwave generating device, the oscillation frequency of the microwave emitted into the heating chamber is scanned in a predetermined frequency band, the reflected power from the heating chamber is detected, and the time when the d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00F24C7/02F25D23/00G01R29/00G01R35/00H05B6/74
CPCH05B6/705H05B6/686H05B2206/044F25D23/12Y02B40/00H05B6/6438H05B6/645H05B6/72
Inventor 阪本芳弘小笠原史太佳
Owner PANASONIC HLDG CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products