CN1680790A - A method for testing the field distribution in a microwave oven cavity - Google Patents
A method for testing the field distribution in a microwave oven cavity Download PDFInfo
- Publication number
- CN1680790A CN1680790A CN 200410022251 CN200410022251A CN1680790A CN 1680790 A CN1680790 A CN 1680790A CN 200410022251 CN200410022251 CN 200410022251 CN 200410022251 A CN200410022251 A CN 200410022251A CN 1680790 A CN1680790 A CN 1680790A
- Authority
- CN
- China
- Prior art keywords
- micro
- field distribution
- wave oven
- furnace chamber
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 66
- 238000010998 test method Methods 0.000 claims abstract description 11
- 229920003023 plastic Polymers 0.000 claims description 17
- 239000004033 plastic Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000010445 mica Substances 0.000 claims description 12
- 229910052618 mica group Inorganic materials 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 239000003989 dielectric material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 13
- 238000004458 analytical method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
A method for testing field distribution in furnace chamber of microwave oven utilizes unbalanced temperature distribution caused by absorbing electromagnetic energy by certain media material in furnace chamber to obtain temperature distribution with infrared camera and then calculates out field distribution. Three test methods including test done at static or active state of glass rotation disc, at waveguide feeding in opening on furnace chamber side wall and at certain sections of furnace chamber are disclosed.
Description
Technical field:
The invention belongs to electronic technology, microwave heating technique field, it is particularly related to the measuring technology of field distribution in the micro-wave oven furnace chamber.
Background technology:
Microwave oven heating food is to send furnace chamber to after electric energy is changed into microwave energy, sets up the microwave field of certain distribution in furnace chamber, and when food was in the microwave field, food can absorb microwave energy and be heated simultaneously inside and outside making food.Generally always wish in the heating process of food and can be heated evenly, and will realize this point, wherein crucial is exactly to require microwave energy can evenly to distribute in furnace chamber, and this is main design objective in the design of household microwave oven furnace chamber.
But because the structure distribution more complicated in the micro-wave oven furnace chamber, calculating brings very big difficulty to practical design.At present, utilize vector network analyzer and use parameter indexs such as to test the standing-wave ratio size that records in the micro-wave oven furnace chamber and Rieke diagram together in the actual factory during for the design of micro-wave oven furnace chamber mostly by the feed antenna of magnetron producer customization.But these test parameterss can't be accurately or field distribution or the Temperature Distribution situation in the reflected microwave stove furnace chamber intuitively, in the micro-wave oven whether evenly the index neither one of heating intuitively or exactly measure.And the important indicator when evenly the characteristic of heating is the micro-wave oven furnace chamber design, most cardinal principle physical dimensions in existing work according to micro-wave oven furnace chamber, adopt what of the pattern count that exists in the pattern analysis Theoretical Calculation furnace chamber, judge whether field distribution is uniform in the furnace chamber.If pattern count is many more, field distribution is just even more so.
But this theoretical analysis method can only be at fairly simple furnace chamber model, and also there is the error in some simplification processes in this theoretical analysis method.If there is a kind of test method can be accurately and measure field distribution in the micro-wave oven furnace chamber easily, and with this important evidence during as the design micro-wave oven furnace chamber, will help to improve the designed capacity of micro-wave oven furnace chamber.
Summary of the invention:
The invention provides a kind of micro-wave oven furnace chamber internal field distribution testing method, it can measure in the micro-wave oven furnace chamber whether design objective such as all even dielectric material microwave absorbing watt level of field distribution.
The invention provides the needed testing tool of a kind of micro-wave oven furnace chamber internal field distribution testing method, comprise the dielectric material under infrared video camera, micro-wave oven and the micro-wave oven no-load condition: lead mouthful mica sheet at place as glass rotating disk, plastics change and oven cavity side ground roll, be used for testing the test paper of the field distribution on the several cross sections of micro-wave oven furnace chamber.
The invention provides a kind of method of testing field distribution in the micro-wave oven furnace chamber, the step below it adopts:
The method of glass disc field distribution during step 1:(tested glass dish stationary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed in the plastics change, remove the plastic seating of glass rotating disk bottom, prevent its rotation, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera tested glass dish, according to formula W=ε E
2/ 2 (wherein, W is the microwave absorbing energy of dielectric material, and converting according to the energy distribution of unit interval obtains distribute power, and ε is the dielectric parameter of dielectric material), the field distribution of glass disc when obtaining the glass disc stationary state;
The method of glass disc field distribution during step 2:(tested glass dish rotary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed on plastics change and the plastic seating, make the micro-wave oven rotary electric machine can rotate glass disc, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera tested glass dish, according to formula W=ε E
2/ 2, the field distribution of glass disc in the time of just can obtaining the glass disc rotary state;
The method of the field distribution of step 3:(test furnace chamber sidewall waveguide feedback porch)
On mica sheet, spray the water of volume, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera test mica sheet, according to formula W=ε E
2/ 2, just can obtain the field distribution of furnace chamber sidewall waveguide feedback porch;
The method of step 4:(test microwave oven cavity section field distribution)
Test paper is positioned over microwave oven cavity section to be measured, on test paper, sprays a spot of water, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera test paper, according to the W=ε E of formula place
2/ 2, just can obtain the field distribution of microwave oven cavity section.
According to the method described above, just can obtain micro-wave oven furnace chamber internal field distribution situation.
Need to prove, be in the micro-wave oven no-load condition in the inventive method mostly, thus need be in when test on the glass disc surface, and some moisture are evenly sprayed on mica sheet surface or some test paper surface, magnetron are caused damage when preventing the sky stove; When using relatively thinner test paper, the test paper that can utilize adhesive tape relatively to approach is fixed on microwave oven cavity section to be measured.
The essence of method of testing of the present invention is to utilize the interior electromagnetic energy of micro-wave oven furnace chamber to be absorbed by some dielectric material and make to re-use the temperature distributing disproportionation weighing apparatus infrared video camera and obtain its Temperature Distribution, thereby obtains field distribution according to certain computing formula reckoning.
The advantage of method of testing of the present invention: adopt method of the present invention, can obtain in the good furnace chamber electromagnetic field inhomogeneity index that whether distributes, for the quality that improves the micro-wave oven design provides foundation; And this method of testing is easy and simple to handle, and required test material cost is low, has avoided the expensive experimental spending.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention
The power attenuation cloud atlas that records when glass disc did not rotate when Fig. 2 was the furnace chamber zero load
Wherein, 1 is glass disc, and 2,3,4,5 all is that the cloud atlas of field distribution is represented, is meant the bigger place of field intensity in the glass disc;
Sidewall feed-in mouth glass disc power attenuation cloud atlas when Fig. 3 is the furnace chamber zero load
Wherein, 6 is mica sheet, and 7 are the field distribution cloud atlas, illustrates that microwave feedback porch field strength distribution is bigger, and 8 is furnace chamber madial wall ventilating opening;
Fig. 4 be in the microwave oven cavity near the power attenuation cloud atlas of fire door section wherein, 9 are the test scraps of paper, 10,11 are the field distribution cloud atlas, illustrate that the field distribution at this section is different, the some places field intensity is big, some places are little;
Fig. 5 is the power attenuation cloud atlas of close feed-in waveguide mouth section in the microwave oven cavity
Wherein, 12 are the test scraps of paper, and 13,14 are the field distribution cloud atlas, and the field intensity maximum near feed-in waveguide mouth section is described, in addition other local field intensity are less;
Fig. 6 is the power attenuation cloud atlas of furnace chamber rear wall section in the microwave oven cavity
Wherein, 15 are the test scraps of paper, and 16,17,18 are the field distribution cloud atlas, illustrate that the field distribution at this section is different, and the some places field intensity is big, and some places are little;
The power attenuation cloud atlas that records when glass disc rotated when Fig. 7 was the furnace chamber zero load
Wherein, 19 is glass disc, the 20th, and the ring-type cloud atlas of field distribution illustrates that glass disc can make its thermally equivalent through after the transmission.
Embodiment
A kind of method of testing field distribution in the micro-wave oven furnace chamber, the step below it adopts:
The method of glass disc field distribution during step 1:(tested glass dish stationary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed in the plastics change, remove the plastic seating of glass rotating disk bottom, prevent its rotation, then after heating 10 seconds under the moderate heat power, open fire door, adopt the microwave absorbing power of infrared video camera tested glass dish, test result as shown in Figure 2;
The method of glass disc field distribution during step 2:(tested glass dish rotary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed on plastics change and the plastic seating, make rotary electric machine can rotate glass disc, then after under the moderate heat power 10 seconds, open fire door, adopt the microwave absorbing power of infrared video camera tested glass dish, test result as shown in Figure 7;
The method of step 3:(test furnace chamber sidewall waveguide feed-in mouth field distribution)
Spray the water of volume on mica sheet, start the micro-wave oven switch then, open fire door in heating under the moderate heat power after 20 seconds, adopt the microwave absorbing power on the infrared video camera test mica sheet, test result as shown in Figure 3;
The method of section field distribution in the step 4:(test microwave oven cavity)
Test paper is positioned over three sections in the microwave oven cavity to be measured, comprise near the fire door section, near feed-in waveguide mouth section and furnace chamber rear wall section, on test paper, spray a spot of water again, then after heating 20 seconds under the moderate heat power, open fire door, adopt the microwave absorbing power of infrared video camera test chamber body section place test-paper, test result is shown in Fig. 4,5,6.
According to the method described above, the test result that obtains field distribution in the micro-wave oven furnace chamber contrasts with the simulation result that adopts the pattern analysis theory to obtain, both field distribution cloud atlas basically identicals have been verified aspect qualitative the validity of this experimental technique can be used for instructing practical design production.
The test result of glass rotating disk:
As shown in Figure 2, the cloud atlas of experiment test distributes very consistent with simulation result, reflects that no-load condition lower-glass dish is the main medium that absorbs microwave, can prevent the following damage for magnetron of sky stove heating.Can see also that on the other hand the field distribution in the furnace chamber is also inhomogeneous, just near the periphery of glass disc, have than higher field distribution, and not high at the periphery place, therefore in the furnace chamber design, still to consider the uniform factor of field distribution.
The test result of waveguide feed-in mouth on the furnace chamber sidewall:
Known that by Fig. 3 the field distribution cloud atlas of experiment test is very consistent with simulation result, the field distribution cloud atlas in waveguide feedback porch is certain fan-shaped distribution, illustrates the highest near antenna feed-in part field intensity, then near diffusion.The mica sheet field distribution of simulation result also is similar to such trend.Can also observe simultaneously the field distribution at micro-wave oven ventilating opening place, illustrate in the furnace chamber through there being thermal convection to produce after the heating.
The test result of three sections in the microwave oven cavity:
The field distribution test result of the several sections of microwave oven cavity is seen Fig. 4,5,6, comprising close fire door section, near feed-in waveguide mouth section and furnace chamber rear wall section, can find in field, waveguide mouth place the strongest, and the field distribution of some section is also inhomogeneous, also makes the deviser need improve the purpose that the furnace chamber design reaches even heating again.
The test result of glass disc under rotation situation:
The field distribution test result of glass disc under rotation situation seen Fig. 7, can find that glass disc its temperature cloud atlas after rotation is evenly distributed, and forms a ring-type, but its field intensity of glass disc center place is also also little.Illustrate under the glass disc rotation situation and help uniform distribution of temperature.
Obtain the index that electromagnetic field is evenly distributed in the good furnace chamber by testing method of the present invention, for the quality that improves the micro-wave oven design provides foundation, and this method of testing is easy, has avoided the expensive experimental spending, is acceptable for its experimentation cost of design of actual factory; This method of testing also can be fit to other field of microwave heating and use.
Claims (2)
1, a kind of method of testing field distribution in the micro-wave oven furnace chamber is characterized in that the following step of its employing:
The method of glass disc field distribution during step 1:(tested glass dish stationary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed in the plastics change, remove the plastic seating of glass rotating disk bottom, prevent its rotation, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera tested glass dish, according to formula W=ε E
2/ 2 (wherein, W is the microwave absorbing energy of dielectric material, and converting according to the energy distribution of unit interval obtains distribute power, and ε is the dielectric parameter of dielectric material), the field distribution of glass disc when obtaining the glass disc stationary state;
The method of glass disc field distribution during step 2:(tested glass dish rotary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed on plastics change and the plastic seating, make the micro-wave oven rotary electric machine can rotate glass disc, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera tested glass dish, according to formula W=ε E
2/ 2, the field distribution of glass disc in the time of just can obtaining the glass disc rotary state;
The method of the field distribution of step 3:(test furnace chamber sidewall waveguide feedback porch)
On mica sheet, spray the water of volume, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera test mica sheet, according to formula W=ε E
2/ 2, just can obtain the field distribution of furnace chamber sidewall waveguide feedback porch;
The method of step 4:(test microwave oven cavity section field distribution)
Test paper is positioned over microwave oven cavity section to be measured, on test paper, sprays a spot of water, start the micro-wave oven switch then, after the micro-wave oven work several seconds, close micro-wave oven, open fire door, adopt the microwave absorbing distribute power on the infrared video camera test paper, according to the W=ε E of formula place
2/ 2, just can obtain the field distribution of microwave oven cavity section.
2, a kind of method of testing field distribution in the micro-wave oven furnace chamber according to claim 1 is characterized in that the following step of its employing:
The method of glass disc field distribution during step 1:(tested glass dish stationary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed in the plastics change, remove the plastic seating of glass rotating disk bottom, prevent its rotation, open fire door in heating under the moderate heat power after 10 seconds then, adopt the microwave absorbing power of infrared video camera tested glass dish;
The method of glass disc field distribution during step 2:(tested glass dish rotary state)
With a spot of water of glass disc surface sprinkling or with wet cloth wiping, be placed on plastics change and the plastic seating, make rotary electric machine can rotate glass disc, then after under the moderate heat power 10 seconds, open fire door, adopt the microwave absorbing power of infrared video camera tested glass dish;
The method of step 3:(test furnace chamber sidewall waveguide feed-in mouth field distribution)
On mica sheet, spray the water of volume, start the micro-wave oven switch then, open fire door after 20 seconds, adopt the microwave absorbing power on the infrared video camera test mica sheet in heating under the moderate heat power;
The method of section field distribution in the step 4:(test microwave oven cavity)
Test paper is positioned over three sections in the microwave oven cavity to be measured, comprise near the fire door section, near feed-in waveguide mouth section and furnace chamber rear wall section, on test paper, spray a spot of water again, then after heating 20 seconds under the moderate heat power, open fire door, adopt the microwave absorbing power of infrared video camera test chamber body section place test-paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100222516A CN100414273C (en) | 2004-04-08 | 2004-04-08 | A method for testing the field distribution in a microwave oven cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100222516A CN100414273C (en) | 2004-04-08 | 2004-04-08 | A method for testing the field distribution in a microwave oven cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1680790A true CN1680790A (en) | 2005-10-12 |
| CN100414273C CN100414273C (en) | 2008-08-27 |
Family
ID=35067462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100222516A Expired - Fee Related CN100414273C (en) | 2004-04-08 | 2004-04-08 | A method for testing the field distribution in a microwave oven cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100414273C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170332841A1 (en) * | 2016-05-23 | 2017-11-23 | Michael Reischmann | Thermal Imaging Cooking System |
| US10009957B2 (en) | 2016-03-30 | 2018-06-26 | The Markov Corporation | Electronic oven with infrared evaluative control |
| CN114046885A (en) * | 2021-11-22 | 2022-02-15 | 北京泰乙信测控技术有限公司 | High-power microwave space positioning and energy region measuring method based on infrared imaging |
| CN114609437A (en) * | 2022-03-23 | 2022-06-10 | 电子科技大学 | Method for testing absorption power of microwave load |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6132084A (en) * | 1998-11-30 | 2000-10-17 | General Electric Company | Infrared non-contact temperature measurement for household appliances |
| JP2002013743A (en) * | 2000-04-28 | 2002-01-18 | Sanyo Electric Co Ltd | Electronic oven |
| JP3444268B2 (en) * | 2000-05-17 | 2003-09-08 | 松下電器産業株式会社 | microwave |
| JP2002317938A (en) * | 2001-04-18 | 2002-10-31 | Sanyo Electric Co Ltd | Microwave oven |
| JP2003161445A (en) * | 2002-11-21 | 2003-06-06 | Matsushita Electric Ind Co Ltd | Cooking utensils |
-
2004
- 2004-04-08 CN CNB2004100222516A patent/CN100414273C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10009957B2 (en) | 2016-03-30 | 2018-06-26 | The Markov Corporation | Electronic oven with infrared evaluative control |
| US10681776B2 (en) | 2016-03-30 | 2020-06-09 | Markov Llc | Electronic oven with infrared evaluative control |
| US11632826B2 (en) | 2016-03-30 | 2023-04-18 | Markov Llc | Electronic oven with infrared evaluative control |
| US20170332841A1 (en) * | 2016-05-23 | 2017-11-23 | Michael Reischmann | Thermal Imaging Cooking System |
| CN114046885A (en) * | 2021-11-22 | 2022-02-15 | 北京泰乙信测控技术有限公司 | High-power microwave space positioning and energy region measuring method based on infrared imaging |
| CN114609437A (en) * | 2022-03-23 | 2022-06-10 | 电子科技大学 | Method for testing absorption power of microwave load |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100414273C (en) | 2008-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108828380B (en) | Device and method for measuring electromagnetic parameters of materials during microwave heating | |
| CN201464397U (en) | On-site detection device for heat transfer coefficient of building envelope | |
| CN207702907U (en) | It is a kind of to utilize vacuum pump pressure intelligent microwave drying equipment | |
| CN102200372A (en) | Micro-wave vacuum freeze-drying equipment | |
| CN102200373A (en) | Vacuum freeze-drying tester | |
| CN1680790A (en) | A method for testing the field distribution in a microwave oven cavity | |
| Rodríguez-García et al. | Experimental and theoretical investigation on using microwaves for storing electricity in a thermal energy storage medium | |
| CN204574146U (en) | Micro-wave oven | |
| CN102200387B (en) | Microwave stirring device and microwave freeze-drying equipment with the device | |
| CN206989271U (en) | Multi-surface heating micro-wave oven | |
| CN221408649U (en) | Post-dip baking device for motor processing | |
| CN104748179A (en) | Microwave Oven Using Ohmic Heating | |
| CN111965066A (en) | A material moisture detection device, control system and control method | |
| CN208599776U (en) | A kind of chamber of constant temperature and humidity | |
| CN206944646U (en) | It is a kind of can uniform heat exchange vacuum drying chamber | |
| CN215898049U (en) | Microwave heating equipment for laboratory | |
| CN205316871U (en) | Electric heating constant -temperature blowing drying box | |
| CN211436878U (en) | glue machine | |
| CN208952605U (en) | A kind of drying process device for biological medicine | |
| CN217237850U (en) | Portable measuring device for residual heat storage capacity of phase change energy storage material | |
| CN222438334U (en) | A drying device for grain storage | |
| CN108262910B (en) | Radio frequency foaming device | |
| US9975773B2 (en) | Carbon aerogel | |
| CN208223007U (en) | A kind of carbon brick production detection vacuum oven | |
| CN214464319U (en) | Energy-saving ventilation frequency conversion control system device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080827 Termination date: 20110408 |