CN110132446B - Electromagnetic oven temperature measurement system based on loading thermistor electromagnetic super-surface - Google Patents
Electromagnetic oven temperature measurement system based on loading thermistor electromagnetic super-surface Download PDFInfo
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- CN110132446B CN110132446B CN201910446200.2A CN201910446200A CN110132446B CN 110132446 B CN110132446 B CN 110132446B CN 201910446200 A CN201910446200 A CN 201910446200A CN 110132446 B CN110132446 B CN 110132446B
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 30
- 239000006096 absorbing agent Substances 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/223—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor characterised by the shape of the resistive element
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- Induction Heating Cooking Devices (AREA)
Abstract
The invention discloses an electromagnetic oven temperature measurement system based on a loaded thermistor electromagnetic super-surface, and belongs to the technical field of microwave electromagnetic super-surfaces. The system comprises an electromagnetic super-surface absorber and a microwave radiation source, wherein the microwave radiation source is positioned right below the electromagnetic super-surface absorber. The electromagnetic super-surface absorber comprises square ring units loaded by thermistors, a medium substrate and a metal floor which are arranged periodically, wherein the square ring units are loaded with PTC and NTC thermistors, the resistance value of the NTC thermistors changes obviously along with the temperature when the temperature is lower, and the resistance value of the PTC thermistors changes obviously along with the temperature when the temperature is higher. The real-time temperature of the induction cooker can be accurately measured by measuring the corresponding relation between the temperature and the absorption capacity of the electromagnetic super surface absorber on the electromagnetic wave emitted by the microwave emission source.
Description
Technical Field
The invention belongs to the technical field of microwave electromagnetic super-surfaces, and particularly relates to an electromagnetic oven temperature measurement system based on a loaded thermistor electromagnetic super-surface.
Background
In recent years, with the popularization of induction cookers in daily life, the requirement on the accuracy of the temperature measurement system of the induction cooker is higher and higher. The existing temperature measuring system of the electromagnetic heating appliance utilizes an NTC thermistor on a coil panel to indirectly measure the temperature of a cooker through a ceramic panel, and has the problems of inaccurate temperature measurement, lagging temperature measurement and the like. The temperature of the pot or the food in the pot is expected to be measured in a non-contact mode in real time and high precision. The electromagnetic super-surface loaded with the thermistor can absorb electromagnetic waves with specific frequency, and the resistance value of the thermistor changes along with the change of temperature, so that the wave absorbing performance of the electromagnetic super-surface on the electromagnetic waves is influenced. By testing the wave absorbing performance of the electromagnetic super surface to electromagnetic waves, the corresponding relation between the electromagnetic super surface and temperature change can be accurately reflected, and accurate temperature measurement is realized.
The document 'electromagnetic heating temperature field non-contact measurement method research' discloses a method for using a thermal infrared imager for electromagnetic heating temperature field measurement, the influence of factors such as measurement distance and emissivity on the temperature measurement of the thermal infrared imager is analyzed through experiments, and a non-contact temperature measurement system is designed. By utilizing the system, a temperature measurement experiment is carried out by taking the induction cooker as an object, and the real-time measurement of the temperature of minus 40 ℃ to plus 140 ℃ is realized. But it is not yet high enough in measurement accuracy.
The document "application analysis of an NTC thermistor in an accurate temperature measurement system" discloses a technical scheme for accurately measuring temperature of an induction cooker by using the NTC thermistor, but since the resistance value change of the NTC thermistor is no longer sensitive to the temperature change after the NTC thermistor exceeds a certain temperature, the temperature measurement accuracy is affected.
For an induction cooker temperature measurement system, temperature measurement precision and sensitivity are important investigation indexes, and how to improve temperature measurement sensitivity is a problem which is urgently needed to be solved at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an induction cooker temperature measuring system based on a thermistor-loaded electromagnetic super-surface, which can realize real-time sensitive measurement of the temperature of the induction cooker.
The technical problem proposed by the invention is solved as follows:
an electromagnetic oven temperature measurement system based on a loaded thermistor electromagnetic super surface comprises an electromagnetic super surface absorber and a microwave radiation source; the electromagnetic super-surface absorber comprises square ring units loaded by thermistors which are arranged periodically, a medium substrate 1 and a metal floor 2; square ring units loaded by thermistors which are arranged periodically are positioned on the lower surface of a medium substrate 1, and a metal floor 2 is positioned on the upper surface of the medium substrate 1;
the square ring unit comprises a square ring structure 3, two T-shaped branches, an NTC (negative temperature coefficient effect) thermistor 4 and a PTC (positive temperature coefficient effect) thermistor 5; the tail ends of the vertical branches of the two T-shaped branches are respectively connected with the middle points of the upper and lower frames of the square ring structure 3, and the horizontal branches are parallel and a gap is reserved between the horizontal branches; a gap is formed in the middle point of the left frame and the right frame of the square ring structure 3, and the NTC thermistor 4 and the PTC thermistor 5 are respectively connected with two ends of the gap in the middle point of the left frame and the right frame of the square ring structure 3;
the microwave radiation source is positioned right below the electromagnetic super-surface absorber and a gap is reserved.
The microwave radiation source is a 2.45GHz crystal oscillator source 6.
The dielectric substrate 1 had a thickness of 5mm and a relative dielectric constant of 2.65.
The microwave radiation source is located 30mm directly below the electromagnetic super-surface absorber.
The frequency of the signal of the microwave radiation source is different from that of the signal of the heating source of the electromagnetic oven, and the signals do not interfere with each other; 2.45GHz microwave signals emitted by the microwave radiation source can be absorbed by the electromagnetic super-surface of the loading thermistor, the resistance values of the NTC thermistor 4 and the PTC thermistor 5 can be changed along with the change of the temperature of the electromagnetic oven, the change of the NTC thermistor 4 is more obvious in a low-temperature state, and the change of the PTC thermistor 5 is more obvious in a high-temperature state; when the resistance values of the NTC thermistor 4 and the PTC thermistor 5 are changed, the absorptivity of the electromagnetic super-surface absorber to electromagnetic waves is correspondingly changed, and the sensitivity of the absorptivity to the temperature change is related to the sensitivity of the NTC thermistor 4 and the PTC thermistor 5 to the temperature change; because the NTC thermistor 4 and the PTC thermistor have high resistance value change sensitivity at low temperature and high temperature respectively, the absorption rate of the electromagnetic super-surface absorber to 2.45GHz electromagnetic waves is sensitive to changes of low temperature and high temperature states, and the electromagnetic super-surface absorber is suitable for an electromagnetic oven temperature measurement system.
The electromagnetic super-surface absorber can not absorb electromagnetic waves for heating the electromagnetic oven, and the electromagnetic waves for heating the electromagnetic oven can directly heat metal (metal floor 2) at the bottom of the cooker through the square ring units and the dielectric substrate 1 loaded by the thermistors which are periodically arranged.
The invention has the beneficial effects that:
compared with the temperature measurement system in the prior art, the temperature measurement system utilizes the electromagnetic super surface to measure the change condition of the electromagnetic wave absorption rate along with the temperature; meanwhile, the NTC thermistor and the PTC thermistor are loaded, so that high-sensitivity temperature measurement of a low-temperature area and a high-temperature area is realized.
Drawings
FIG. 1 is a side view of an electromagnetic super surface absorber in accordance with the present invention;
FIG. 2 is a top view of an electromagnetic super surface absorber in accordance with the present invention;
FIG. 3 is a schematic structural diagram of a quad ring unit according to the present invention;
FIG. 4 is a schematic diagram of the operation of the thermometry system of the present invention;
FIG. 5 is a graph showing the relationship between the resistance and the temperature of the NTC thermistor according to the present invention;
FIG. 6 is a graph showing the relationship between the resistance and the temperature of the PTC thermistor according to the present invention;
FIG. 7 is a graph showing the relationship between the absorption rate and the temperature change at 0-110 ℃ of the electromagnetic super-surface absorber loaded with the NTC thermistor and the PTC thermistor according to the embodiment.
Detailed Description
The invention is further described below with reference to the figures and examples.
The embodiment provides an electromagnetic oven temperature measurement system based on a loaded thermistor electromagnetic super surface, which comprises an electromagnetic super surface absorber and a microwave radiation source, wherein the electromagnetic super surface absorber is shown in a side view and a top view in fig. 1-2 and comprises square ring units loaded by periodically arranged thermistors, a medium substrate 1 and a metal floor 2, the thickness of the medium substrate 1 is 5mm, the relative dielectric constant is 2.65, the square ring units loaded by the periodically arranged thermistors are positioned on the lower surface of the medium substrate 1, the metal floor 2 is positioned on the upper surface of the medium substrate 1, the square ring units are arranged in an 8 × 8 periodic structure, and the unit period is 35 mm;
the schematic structural diagram of the square ring unit is shown in fig. 3, and comprises a square ring structure 3, two T-shaped branches, an NTC thermistor 4 and a PTC thermistor 5; the tail ends of the vertical branches of the two T-shaped branches are respectively connected with the middle points of the upper and lower frames of the square ring structure 3, and the horizontal branches are parallel and a gap is reserved between the horizontal branches; the T-shaped branch increases a current path, and the working frequency is lower under the condition of the same unit size; a gap is formed in the middle point of the left frame and the right frame of the square ring structure 3, and the NTC thermistor 4 and the PTC thermistor 5 are respectively connected with two ends of the gap in the middle point of the left frame and the right frame of the square ring structure 3;
the microwave radiation source is a 2.45GHz crystal oscillator source 6 and is positioned 30mm right below the electromagnetic super-surface absorber.
The working schematic diagram of the temperature measuring system of the embodiment is shown in fig. 4, in practical situations, the bottom of the pot can be regarded as a metal floor 2, and electromagnetic waves for heating the induction cooker can directly heat metal (the metal floor 2) at the bottom of the pot through square ring units and a dielectric substrate 1 loaded by thermistors which are periodically arranged.
The resistance value of the NTC thermistor changes with the temperature as shown in FIG. 5, the resistance value changes with the temperature obviously when the temperature is low, but the resistance value changes with the temperature not obviously when the temperature exceeds 100 ℃, and the wave absorption rate of the electromagnetic metamaterial can change with the temperature obviously only when the resistance value changes obviously, so that the NTC thermistor is only suitable for low temperature conditions. The resistance value of the PTC thermistor changes with the temperature as shown in FIG. 6, when the temperature exceeds 100 ℃, the resistance value has a step jump, the resistance value changes with the temperature very obviously, but the resistance value changes insignificantly in the low temperature region, therefore, the PTC thermistor is suitable for the high temperature condition;
in the embodiment, the absorption rate and the temperature change of the electromagnetic super-surface of the NTC thermistor and the PTC thermistor are loaded at the same time at 0-110 ℃ as shown in FIG. 7, the absorption rate is improved by about 1% for every 1 ℃ change of the temperature in the low-temperature region, and the absorption rate is improved by about 1.5% for every one degree change of the temperature in the high-temperature region.
In summary, in the temperature measurement system of this embodiment, the resistance of the thermistor changes with temperature changes, so that the absorption rate of the electromagnetic super-surface loaded with the thermistor to the electromagnetic wave emitted by the microwave emission source changes with temperature changes, real-time measurement of the temperature of the electromagnetic oven is realized by measuring the absorption rate, and the NTC thermistor and the PTC thermistor are loaded simultaneously in the structure, so that high sensitivity of temperature measurement in a low temperature region and a high temperature region is realized, and accurate temperature measurement of 0-110 ℃ is realized.
Claims (5)
1. An electromagnetic oven temperature measurement system based on a loaded thermistor electromagnetic super surface is characterized by comprising an electromagnetic super surface absorber and a microwave radiation source; the electromagnetic super-surface absorber comprises square ring units loaded by thermistors which are arranged periodically, a medium substrate (1) and a metal floor (2); square ring units loaded by thermistors which are arranged periodically are positioned on the lower surface of a medium substrate (1), and a metal floor (2) is positioned on the upper surface of the medium substrate (1);
the square ring unit comprises a square ring structure (3), two T-shaped branches, an NTC thermistor (4) and a PTC thermistor (5); the tail ends of the vertical branches of the two T-shaped branches are respectively connected with the middle points of the upper and lower frames of the square ring structure (3), and the horizontal branches are parallel and a gap is reserved between the horizontal branches; a gap is formed in the middle point of the left frame and the right frame of the square ring structure (3), and the NTC thermistor (4) and the PTC thermistor (5) are respectively connected with two ends of the gap in the middle point of the left frame and the right frame of the square ring structure (3);
the microwave radiation source is positioned right below the electromagnetic super-surface absorber and a gap is reserved.
2. The induction cooker temperature measurement system based on the loaded thermistor electromagnetic super-surface according to claim 1, characterized in that the microwave radiation source is a 2.45GHz crystal vibration source (6).
3. The induction cooker temperature measurement system based on the loaded thermistor electromagnetic super surface according to claim 1, characterized in that the thickness of the dielectric substrate (1) is 5mm, and the relative dielectric constant is 2.65.
4. The loaded thermistor electromagnetic super-surface based induction cooker temperature measurement system according to claim 1, characterized in that the microwave radiation source is located 30mm directly below the electromagnetic super-surface absorber.
5. The induction cooker temperature measurement system based on the loaded thermistor electromagnetic super-surface as claimed in claim 1, wherein the square ring units are in a periodic arrangement of 8 × 8.
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| CN201910446200.2A CN110132446B (en) | 2019-05-27 | 2019-05-27 | Electromagnetic oven temperature measurement system based on loading thermistor electromagnetic super-surface |
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| CN201910446200.2A CN110132446B (en) | 2019-05-27 | 2019-05-27 | Electromagnetic oven temperature measurement system based on loading thermistor electromagnetic super-surface |
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| CN110132446B true CN110132446B (en) | 2020-07-21 |
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Citations (6)
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| US8717659B2 (en) * | 2011-06-24 | 2014-05-06 | University Of Southampton | Tunable metamaterials and related devices |
| CN205748698U (en) * | 2016-05-24 | 2016-11-30 | 成都宏明电子股份有限公司 | A kind of New temperature sensor |
| CN107607210A (en) * | 2017-09-28 | 2018-01-19 | 东南大学 | A kind of temperature sensor based on metamaterial structure |
| CN108598687A (en) * | 2018-01-16 | 2018-09-28 | 中北大学 | Wireless high temperature sensor and preparation method thereof based on electromagnetism Meta Materials |
| CN207991708U (en) * | 2018-01-16 | 2018-10-19 | 深圳金智凌轩视讯技术有限公司 | Low-power consumption temperature collecting device |
| CN108879109A (en) * | 2018-06-28 | 2018-11-23 | 西安电子科技大学 | The ultra wide band angle stabilization Salisbury for loading FSS inhales wave screen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007103560A2 (en) * | 2006-03-08 | 2007-09-13 | Los Alamos National Security, Llc | Dynamical/tunable electromagnetic materials and devices |
| US20130314765A1 (en) * | 2012-05-25 | 2013-11-28 | The Trustees Of Boston College | Metamaterial Devices with Environmentally Responsive Materials |
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2019
- 2019-05-27 CN CN201910446200.2A patent/CN110132446B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8717659B2 (en) * | 2011-06-24 | 2014-05-06 | University Of Southampton | Tunable metamaterials and related devices |
| CN205748698U (en) * | 2016-05-24 | 2016-11-30 | 成都宏明电子股份有限公司 | A kind of New temperature sensor |
| CN107607210A (en) * | 2017-09-28 | 2018-01-19 | 东南大学 | A kind of temperature sensor based on metamaterial structure |
| CN108598687A (en) * | 2018-01-16 | 2018-09-28 | 中北大学 | Wireless high temperature sensor and preparation method thereof based on electromagnetism Meta Materials |
| CN207991708U (en) * | 2018-01-16 | 2018-10-19 | 深圳金智凌轩视讯技术有限公司 | Low-power consumption temperature collecting device |
| CN108879109A (en) * | 2018-06-28 | 2018-11-23 | 西安电子科技大学 | The ultra wide band angle stabilization Salisbury for loading FSS inhales wave screen |
Non-Patent Citations (1)
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