CN110346044A - A kind of gas-cooker anti-dry detection method, detection device and gas-cooker - Google Patents
A kind of gas-cooker anti-dry detection method, detection device and gas-cooker Download PDFInfo
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- CN110346044A CN110346044A CN201810296732.8A CN201810296732A CN110346044A CN 110346044 A CN110346044 A CN 110346044A CN 201810296732 A CN201810296732 A CN 201810296732A CN 110346044 A CN110346044 A CN 110346044A
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 230000005855 radiation Effects 0.000 claims abstract description 44
- 238000010411 cooking Methods 0.000 claims abstract description 38
- 238000002310 reflectometry Methods 0.000 claims abstract description 33
- 238000012937 correction Methods 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 7
- 101150006573 PAN1 gene Proteins 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000005457 Black-body radiation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005616 pyroelectricity Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- VIDTVPHHDGRGAF-UHFFFAOYSA-N selenium sulfide Chemical compound [Se]=S VIDTVPHHDGRGAF-UHFFFAOYSA-N 0.000 description 2
- 229960005265 selenium sulfide Drugs 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000000747 cardiac effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
- G01J5/806—Calibration by correcting for reflection of the emitter radiation
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Abstract
The invention discloses a kind of gas-cooker anti-dry detection method, detection device and gas-cookers, issue infrared radiation pulses to the bottom of a pan by calibration light source, which is received after the bottom of a pan is reflected by correction infrared detector, and is converted to electric signal；Calculate reflectivity and the transmitting in the bottom of a pan；Close calibration light source；The infrared energy that the bottom of a pan itself issues is received by thermometric infrared detector, and is converted to electric signal, obtains the infrared energy that the bottom of a pan itself issues；Calculate cooking bottom temperature；Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature；If so, closing gas valve or alarm；Therefore, the present invention is when using different pots, cooking bottom temperature is calculated using the rate meter in the corresponding the bottom of a pan, obtain more accurate temperature value, it solves the problems, such as to cause thermometric inaccurate because pot body emmisivity difference is larger in the prior art, the accuracy for improving the cooking bottom temperature detected improves the accuracy of anti-dry control.
Description
Technical field
The invention belongs to gas-cooker technical fields, specifically, being to be related to a kind of gas-cooker anti-dry detection method, detection
Device and gas-cooker.
Background technique
Gas-cooker is the daily necessity of family's indispensability, has very important status in daily life.
Gas cooker has a wide range of application, and culinary art easily is forgotten to monitor, and continues dry combustion method after causing dry pot, damages cookware or causes
Fire.Anti-dry system can effectively detect dry-fire condition, alarm or close in time air valve to user.
Current anti-dry scheme has the disadvantages that
One, anti-dry is contacted using used temperature measuring equipment using thermocouple or thermistor etc. in existing gas-cooker
Formula temperature sensor, temperature measuring equipment directly contact the bottom of a pan or contact the bottom of a pan thermometric by metal shell, and temperature measuring equipment must be with
The bottom of a pan contact.Heat passes to temperature measuring equipment by heat transfer by the bottom of a pan, and poor contact can generate large error.To avoid high temperature
Flame directly heats temperature measuring equipment, causes large error, and burner needs to carry out special designing, and design is limited.See
CN101382303B, there are certain defect, flames easily to directly heat to temperature probe for this structure, generates interference；Temperature probe
It is also easy to bring measurement error with the bottom of a pan poor contact.
Two, existing program detects cooking bottom temperature using infrared temperature-test technology, and is applied in gas-cooker, but gas-cooker is deposited
In flame, flame can generate certain interference.Although flame intensity is very low, the infra-red radiation issued still can be to thermometric
As a result it has an impact.To solve this problem, it is currently used for the infrared measurement of temperature scheme of gas-cooker, such as CN 102374529A, CN
102374530A has used metal isolation ring to separate flame, and metal isolation ring is close to the bottom of a pan, and temperature measuring equipment still needs and the bottom of a pan
Contact.The drawbacks of this design without improving thermojunction type conventional gas stove thermometric mode completely, poor contact is still easy band
Carry out error, flame directly is also easy to bring error to the heating of metal isolation ring, to reduce flame bring heat, burner structure
Need special optimization.
Three, it is currently used for the infrared measurement of temperature scheme of gas-cooker, thermometric accuracy is influenced very big by the bottom of a pan emissivity.It is existing
There is the infrared measurement of temperature scheme for gas-cooker to use common full spectral coverage infrared detector (being commonly generally 5.5~14um),
When the detection emmisivity difference of pot is larger, very big detection error can be brought.For example, mutually synthermal black iron pan and stainless steel
Put one's cards on the table pot, since the infrared emittance difference of the two is larger, if detected using identical full spectral coverage infrared detector, signal is strong
Degree has larger difference, and the temperature value error obtained is up to tens degree.A small number of schemes use high temperature resistant such as CN 102374530A
Sheet metal contact the bottom of a pan, infrared measurement of temperature it is actually detected be refractory metal piece infrared intensity, not by the bottom of a pan emissivity
Influence.But temperature measuring equipment is contact, does not play the non-contact advantage of infrared measurement of temperature, loses the meaning of infrared measurement of temperature
Justice, and not can avoid the influence of poor contact and flame heating metal isolation ring interference.
Summary of the invention
The present invention provides a kind of gas-cooker anti-dry detection methods, improve the accuracy of the cooking bottom temperature detected,
Improve the accuracy of anti-dry control.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme:
A kind of gas-cooker anti-dry detection method, which comprises
(1) infrared radiation pulses are issued to the bottom of a pan by calibration light source, the infrared radiation pulses are after the bottom of a pan is reflected by school
Positive infrared detector receives, and is converted to electric signal V2；Calculate the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；Calculate pot
Emissivity α=1- β at bottom；
(2) calibration light source is closed；
(3) infrared energy that the bottom of a pan itself issues is received by thermometric infrared detector, and is converted to electric signal V1；
The infrared energy E1 that the bottom of a pan itself issues is obtained according to electric signal V1；
(4) according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；
(5) judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；
If so, closing gas valve or alarm.
Further, calibration light source issue infra-red radiation wavelength be located at thermometric infrared detector receiving wave range it
It is interior.
Further, it is mounted on optical filter on the thermometric infrared detector and correction infrared detector, it is described
Optical filter is narrow-band pass filter, and the central wavelength of the optical filter is within the scope of 3.4um~4.4um.
Further, the detection method further include:
After closing calibration light source, judge whether to change pot according to the electric signal V1 that thermometric infrared detector exports；
If so, reopening calibration light source, the reflectivity in the bottom of a pan is detected again.
A kind of gas-cooker anti-dry detection device, comprising:
Calibration light source, for issuing infrared radiation pulses to the bottom of a pan；
Infrared detector is corrected, the infrared radiation pulses issued for receiving the calibration light source through the bottom of a pan reflection, and convert
For electric signal V2；
Thermometric infrared detector, the infrared energy issued for receiving the bottom of a pan itself, and be converted to electric signal V1；
Computing module is inquired, for calculating the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；Calculate the transmitting in the bottom of a pan
Rate α=1- β；The infrared energy E1 that the bottom of a pan itself issues is obtained according to electric signal V1；
Judgment module, for according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is that this special fence-Boltzmann is normal
Number；Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；If so, closing gas valve or alarm.
Further, calibration light source issue infra-red radiation wavelength be located at thermometric infrared detector receiving wave range it
It is interior.
Further, it is mounted on optical filter on the thermometric infrared detector and correction infrared detector, it is described
Optical filter is narrow-band pass filter, and the central wavelength of the optical filter is within the scope of 3.4um~4.4um.
Further, the inquiry computing module is also used to, and is sentenced according to the electric signal V1 that thermometric infrared detector exports
It is disconnected whether to change pot.
A kind of gas-cooker, including burner and the anti-dry detection device.
Further, the anti-dry detection device is laid in the side of burner, towards the bottom of a pan central location；Alternatively,
Light hole is offered in the central location of the burner, the detection device is laid in the underface of the light hole.
Compared with prior art, the advantages and positive effects of the present invention are: gas-cooker anti-dry detection method of the invention,
Detection device and gas-cooker issue infrared radiation pulses to the bottom of a pan by calibration light source, which reflects through the bottom of a pan
It is received afterwards by correction infrared detector, and is converted to electric signal V2；Calculate the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；
Calculate emissivity α=1- β in the bottom of a pan；Close calibration light source；It is issued by the thermometric infrared detector reception the bottom of a pan itself infrared
Radiation energy, and be converted to electric signal V1；The infrared energy E1 that the bottom of a pan itself issues is obtained according to electric signal V1；According to public affairs
Formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；Judge that gas-cooker is according to cooking bottom temperature T
It is no to be in dry-fire condition；If so, closing gas valve or alarm；Therefore, the present invention calculates pot by the bottom of a pan emissivity obtained
Bottom temperature calculates cooking bottom temperature using the rate meter in the corresponding the bottom of a pan, obtains more accurate temperature value when using different pots,
It solves the problems, such as to cause thermometric inaccurate because pot body emmisivity difference is larger in the prior art, improves the bottom of a pan temperature detected
The accuracy of degree improves the accuracy of anti-dry control；Moreover, first calculating the bottom of a pan emissivity, calibration light source is turned off, then
The infrared energy E1 that the bottom of a pan itself issues is obtained again, calculates cooking bottom temperature, and calibration light source is avoided to interfere thermometric infrared acquisition
Device improves the bottom of a pan thermometric accuracy.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of gas-cooker proposed by the invention；
Fig. 2 is the structural schematic diagram of another embodiment of gas-cooker proposed by the invention；
Fig. 3 is the main view of one embodiment of gas-cooker anti-dry detection device proposed by the invention；
Fig. 4 is the top view of Fig. 3；
Fig. 5 is the flow chart of one embodiment of gas-cooker anti-dry detection method proposed by the invention.
Appended drawing reference:
P, anti-dry detection device；1, the bottom of a pan；2, burner；2-1, light hole；3, glass baffle plate；
4, bottom plate；5, bracket；6, calibration light source；7, thermometric infrared detector；8, optical filter；9, circuit board；10, it corrects red
External detector.
Specific embodiment
A specific embodiment of the invention is described in more detail with reference to the accompanying drawing.
The material of pot is different, and reflectivity is different, and the emissivity of pan with black bottom generally can be to 0.9, and stainless steel pot of putting one's cards on the table exists
Near 0.4.If using identical emissivity to calculate using when different pots, temperature measurement error will necessarily be introduced.For the technology
Problem, the present embodiment propose a kind of gas-cooker anti-dry detection method, detection device and gas-cooker, anti-by the detection the bottom of a pan
Rate is penetrated, cooking bottom temperature is calculated according to the bottom of a pan reflectivity, the accuracy of the cooking bottom temperature detected is improved, improves anti-dried burning control
The accuracy of system.
In the following, gas-cooker, anti-dry detection device and anti-dry detection method are described in detail.
The gas-cooker of the present embodiment mainly includes burner 2 and anti-dry detection device P.In the central position of burner 2
It sets and offers light hole 2-1, anti-dry detection device P is laid in the underface of light hole 2-1, fixed with the bottom plate 4 of gas-cooker
Together, shown in Figure 1.
Anti-dry detection device P is located at the underface of burner light hole, with burner 2 apart from farther out, not will receive combustion
The interference of 2 high temperature of burner.Light hole 2-1 is the through-hole of circle or other shapes, and the infra-red radiation in the bottom of a pan 1 passes through light hole 2-1
Anti-dry detection device P is reached, the Assurance of Size of light hole 2-1 does not block the visual field S of anti-dry detection device P.In light hole
Glass baffle plate 3 is installed on the upper surface 2-1, prevents dust from descending slowly and lightly by light hole 2-1 to the anti-dry detection device P of lower section
On, glass baffle plate 3, and can be with resistance to certain high temperature, such as sapphire using the material that can penetrate infrared radiation wavelength.
As another preferred design of the present embodiment, anti-dry detection device P is laid in the branch of 2 side of burner
On frame 5, and towards 1 central location of the bottom of a pan, bracket 5 is fixed on the bottom plate 4 of gas-cooker, is offered on the hearth of gas-cooker logical
Unthreaded hole is fixed with glass baffle plate 3, the surface of glass baffle plate 3 and hearth flush on light hole, and glass baffle plate 3 is for preventing
Only dust descends slowly and lightly through light hole to anti-dry detection device P, and the infra-red radiation in the bottom of a pan passes through glass baffle plate 3, light hole is injected and prevented
Dry combustion method detection device P, it is shown in Figure 2.Anti-dry detection device P favours the vertical line in the bottom of a pan, through gas-cooker when detection
Flame detects cooking bottom temperature.The benefit designed in this way is: the visual field S of anti-dry detection device P is not by the screening of burner 2
Gear；Be conducive to gas-cooker fuel design, burner center does not need to open up light hole, does not influence central flame, can be used general
Logical burner, is also particularly suitable for moderate heat direct spray type gas stove.
Anti-dry detection device P includes calibration light source 6, correction infrared detector 10, thermometric infrared detector 7, inquiry meter
Module, judgment module are calculated, referring to shown in Fig. 3, Fig. 4, computing module and judgment module is inquired, can be integrated into the same circuit board 9
On.
Calibration light source 6, for issuing infrared radiation pulses to the bottom of a pan 1；Enter correction infrared detector after the bottom of a pan 1 is reflected
10.The wavelength for the infra-red radiation that calibration light source 6 issues is located at the received wave of correction infrared detector 10 and thermometric infrared detector 7
Within section.Laser can be used in calibration light source, and the calibration light source of the forms such as tungsten lamp, LED, laser also can be used, and use is this kind of
When light source, the angle of divergence of light source is limited, and keeps its range of exposures and the visual field of detector close.Can by lens,
The angle of divergence of the limiting light sources such as reflecting mirror, diaphragm.The light of its all band also can be used in calibration light source, such as visible light, ultraviolet light
Deng, but it is most accurate using the reflectivity that infrared light light source measures.
By laying optical filter on calibration light source 6, so that the wavelength for the infra-red radiation that calibration light source 6 issues is located at correction
It is simple and convenient, effect is good within the receiving wave range of infrared detector 10 and thermometric infrared detector 7.
Infrared detector 10 is corrected, the infrared energy issued for receiving the calibration light source 6 reflected through the bottom of a pan 1, and
Electric signal is converted by the optical signal received, such as thermoelectric pile, pyroelectricity, indium gallium arsenic photodiode, selenium sulfide detector
Equal type of sensors.The field angle that correction infrared detector is limited using elements such as lens, reflecting mirror, diaphragms, makes calibration light source
Light cone angle and correction infrared detector field angle close to thermometric infrared detector field angle.
Thermometric infrared detector 7: the infrared energy issued for receiving the bottom of a pan itself, and the optical signal that will be received
It is converted into electric signal, such as thermoelectric pile, pyroelectricity, indium gallium arsenic photodiode, selenium sulfide detector type of sensors.
The visual angle of thermometric infrared detector 7 determines that the area of its search coverage, last temperature value are according to entire detection
What the thermal infrared radiation total amount in region obtained.Thermometric infrared detector 7 arrives the distance in the bottom of a pan 1 farther out, thermometric infrared detector 7
Field angle is limited to less than 10 degree, in this way can be by burner from the infra-red radiation that the bottom of a pan 1 reaches thermometric infrared detector 7
The light hole 2-1 of centre is blocked or is interfered without being burned device.There are condenser, lens in the front end of thermometric infrared detector 7
Formula or reflective condenser can be used for limiting the field angle of detector.
Infrared fileter 8 is installed on thermometric infrared detector 7, optical filter is narrow-band pass filter, in optical filter
Cardiac wave is long within the scope of 3.4um~4.4um, and passband half-peak breadth is or more wider less than 5% central wavelength, in passband
There is very high transmitance, it is very low in the transmitance of its all band, optical means can be used in this way rather than metal sleeve row
Except the interference of flame.Common infrared detector generally has wider detection range, such as 8~14um, and detection range is wider, fire
Flame has multiple stronger infrared emission wave bands, and a portion can be fallen in detection range, causes very big interference to infrared measurement of temperature.
Optically rather than mechanical means reduces interference of the flame infrared light to measurement result, uses the transparent spectral window of flame
The wave band of (excluding flame interference), is located at the reception wavelength of thermometric infrared detector 7 in flame transparency window mouth region, reduces flame
Interference of the infra-red radiation to temperature-measuring results is achieved the non-cpntact measurement cooking bottom temperature in gas-cooker, to realize non-connect
Touch burning prevention function.Optical filter is also installed on correction infrared detector 10, optical filter is narrow-band pass filter, optical filter
Central wavelength is within the scope of 3.4um~4.4um, avoids influence of the flame to albedo measurement.
In the present embodiment, calibration light source 6, thermometric infrared detector 7, infrared detector 10 is triangular in shape is laid in for correction
In the shell of detection device, referring to shown in Fig. 3, Fig. 4, structure is compact, and occupied space is smaller.
Anti-dry detection device P mainly includes the following steps, for executing following anti-dry detection methods referring to Fig. 5
It is shown.
Step S11: infrared radiation pulses are issued to the bottom of a pan by calibration light source.
The infrared radiation pulses that calibration light source issues are received after the bottom of a pan is reflected by correction infrared detector.
Step S12: correction infrared detector receives the infrared radiation pulses that the calibration light source reflected through the bottom of a pan issues, and turns
It is changed to electric signal V2.
Correction infrared detector not only receives the infrared radiation pulses that the calibration light source through the bottom of a pan reflection issues, while
The infra-red radiation that the bottom of a pan itself issues is received, the signal eventually received is the superposition of above-mentioned two signal, i.e. pulse signal
It is superimposed direct current signal, direct current signal represents the infrared intensity in the bottom of a pan itself；Pulse signal, which is represented, is reflected into correction through the bottom of a pan
The infrared signal that the calibration light source of infrared detector issues, the intensity of this signal and the reflectivity in the bottom of a pan are related, the bottom of a pan
Reflectivity is higher, then this signal is stronger.Therefore, total electric signal of correction infrared detector output is that direct current signal and pulse are believed
The superposition of number V2 uses V2 to calculate the bottom of a pan emissivity.
Step S13: inquiry computing module calculates the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；Then it calculates and takes the dish out of the pot
Emissivity α=1- β at bottom.
Constant m is related with correction infrared detector and calibration light source, can be measured by standard reflecting plate.For example, utilizing
Identical infrared detector, identical calibration light source, the standard reflecting plate that known reflectivity is β 0 are tested, calibration light source hair
Infra-red radiation out is irradiated on standard reflecting plate, is received after standard reflecting plate reflects by infrared detector, and export telecommunications
Number V0, then calculates m=β 0/V0.
It when infrared ray is irradiated on object, energy or is absorbed, or is reflected by the object, or penetrate object by object.According to
Law of conservation of energy, incident energy=absorption energy+reflection energy+transmission energy.
Therefore, absorptivity+reflectivity+transmissivity=100%.
If object be it is opaque, transmissivity 0, then above-mentioned formula becomes:
Absorptivity+reflectivity=100%.
Any opaque article, while in absorption, reflection, the infrared energy (thermal energy) of transmitting.
If object absorbs infrared energy (thermal energy), its temperature can rise.When object is in Isothermal Condition, it launches
Energy and absorption energy be it is identical, therefore, absorptivity=emissivity, above-mentioned formula becomes:
Emissivity+reflectivity=100%.
State at pot on gas-cooker can be approximately considered absorptivity=emissivity, therefore, the emissivity in the bottom of a pan
α+reflectivity β=100%.Therefore, then emissivity α=1- β can be calculated by the reflectivity β in the detection the bottom of a pan.
Step S14: calibration light source is closed.
Step S15: the infrared energy that the bottom of a pan itself issues is received by thermometric infrared detector, and is converted to telecommunications
Number V1.
Step S16: inquiry computing module obtains the infrared energy E1 that the bottom of a pan itself issues according to electric signal V1.
There is corresponding relationship between the electric signal and radiation energy of the output of thermometric infrared detector, thermoelectric pile, photoelectricity are visited
The different detectors such as device are surveyed, corresponding relationship is different.For most detectors, radiation that output signal voltage V ∝ is received
ENERGY E.
Table is corresponded to by inquiring infrared detector model-output electric signal-radiation energy, obtains the corresponding radiation of electric signal
Energy.The correspondence table can be obtained using the measurement of standard black body radiation source.
For example, the emissivity α 0 in standard black body radiation source is 1, infrared detector receives the radiation energy in standard black body radiation source
Amount, and electric signal V0 is exported, temperature value T0 is calculated, according to formula E0=α 0* δ * T04E0 is calculated, δ is this special fence-Bohr
Hereby graceful constant.Different radiation energies, corresponding different output electric signal and temperature value.Therefore, using the infrared of different model
Detector obtains corresponding electric signal, temperature value, radiation energy using the above method, generates detector model-output telecommunications
Number-radiation energy corresponds to table.
Therefore, by inquiring corresponding table, the corresponding E1 of V1 is obtained.
Step S17: judgment module is according to formula E1=α δ T4, calculate cooking bottom temperature T.
By E1=α δ T4It can releaseCalculate T.Wherein, δ is this special fence-Boltzmann constant, can specifically be joined
See this special fence-Boltzmann law, details are not described herein again.
Step S18: judgment module judges whether gas-cooker is in dry-fire condition according to cooking bottom temperature T.
If cooking bottom temperature T >=set temperature threshold value (such as 298 DEG C), illustrates that cooking bottom temperature is very high, then determines at gas-cooker
In dry-fire condition, S19 is thened follow the steps: closing gas valve or alarm.
The gas-cooker anti-dry detection method of the present embodiment issues infrared radiation pulses to the bottom of a pan by calibration light source, should
Infrared radiation pulses are received after the bottom of a pan is reflected by correction infrared detector, and are converted to electric signal V2；Calculate the reflection in the bottom of a pan
Rate β=V2*m, wherein m is constant；Calculate emissivity α=1- β in the bottom of a pan；Close calibration light source；Pass through thermometric infrared detector
The infrared energy that the bottom of a pan itself issues is received, and is converted to electric signal V1；The bottom of a pan itself is obtained according to electric signal V1 to issue
Infrared energy E1；According to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；Root
Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；If so, closing gas valve or alarm；Therefore, the present embodiment
Detection method calculates cooking bottom temperature by the bottom of a pan emissivity of acquisition, when using different pots, uses the emissivity in the corresponding the bottom of a pan
Cooking bottom temperature is calculated, obtains more accurate temperature value, solve causes to survey because pot body emmisivity difference is larger in the prior art
The problem of warm inaccuracy, improves the accuracy of the cooking bottom temperature detected, improves the accuracy of anti-dry control；Moreover,
The bottom of a pan emissivity is first calculated, calibration light source is turned off, then obtains the infrared energy E1 that the bottom of a pan itself issues again, calculates pot
Bottom temperature avoids calibration light source from interfering thermometric infrared detector, improves the bottom of a pan thermometric accuracy.
The infrared energy E1 that the present embodiment detects the bottom of a pan emissivity α by timesharing and the bottom of a pan itself issues, so that school
The infrared radiation pulses that positive light source issues can not be received after the bottom of a pan is reflected by infrared measurement of temperature detector, avoid calibration light source to red
Outer thermometric interferes.
The bottom of a pan may be slightly different in the reflectivity of different-waveband, therefore, in the present embodiment, what calibration light source 6 issued
The wavelength of infra-red radiation is located within the receiving wave range of thermometric infrared detector, the wave for the infrared radiation pulses that calibration light source issues
Length is identical as the infrared radiation wavelength range that the bottom of a pan itself issues, and to obtain more accurate the bottom of a pan reflectivity, it is quasi- to improve thermometric
True property.That is, the infra-red radiation that calibration light source issues is in the temperature-measuring range of thermometric infrared detector after the bottom of a pan is reflected.
For example, the receiving wave range of thermometric infrared detector is 3um~5.5um, then calibration light source can choose sending wavelength
For laser, LED or the tungsten lamp in 3um~5.5um infrared region.Reflectivity detection does not carry out simultaneously with infrared measurement of temperature, combustion gas
Stove of short duration unlatching calibration light source when detecting the bottom of a pan reflectivity, infrared measurement of temperature detector does not detect at this time, and thes bottom of a pan reflectivity is waited to examine
After survey, calibration light source is closed, and infrared measurement of temperature detector works again, carries out temperature detection.
Before executing step S11, after gas combustion range ignition, whether there is pot on detection gas-cooker first.If there is pot, continue
Execute step S11.If whether having pot or warning note on sustainable detection gas-cooker without pot.
It can judge whether there is pot on gas-cooker by detecting the bottom of a pan reflectivity β (or emissivity α).If reflectivity β (or transmitting
Rate α) in the range of setting, then determine there is pot on gas-cooker；If reflectivity β (or emissivity α) not in the range of setting,
Determine on gas-cooker without pot.
Then the present embodiment calculates the bottom of a pan emissivity, when using different pots, uses correspondence by measurement the bottom of a pan reflectivity
Rate meter calculate cooking bottom temperature, obtain more accurate cooking bottom temperature value.
After the emissivity for obtaining the bottom of a pan, calibration light source is closed；But in gas-cooker use process, it may occur that midway
The case where changing pot, therefore, inquiry computing module also needs the electric signal V1 exported according to thermometric infrared detector to judge whether to change
Pot；If so, reopen calibration light source, detect the infrared reflectivity in the bottom of a pan again, recalculate cooking bottom temperature, avoid due to
Change temperature measurement error caused by pot.It will lead to the output electric signal exception of thermometric infrared detector due to changing pot halfway, when electricity
It when abnormal signal, then needs to detect the bottom of a pan reflectivity again, extinguish obtaining the bottom of a pan reflectivity post-equalization light source.
The gas-cooker anti-dry detection method, anti-dry detection device and gas-cooker of the present embodiment, by using infrared survey
Temperature technique, realize it is non-contact cooking bottom temperature is more accurately detected, realize gas-cooker contactless dry-fire condition detection, phase
Compared with contact detection scheme in the prior art, interference of the poor contact to thermometric is eliminated；By detecting the reflectivity in the bottom of a pan,
The emissivity for calculating the bottom of a pan, then calculates cooking bottom temperature, reduces bring cooking bottom temperature survey due to the bottom of a pan emissivity difference
Error is measured, keeps temperature-measuring results more accurate, reduces the false alarm or the alert phenomenon of understatement of anti-dry, is applicable in gas-cooker
Wider cookware type；By laying optical filter on thermometric infrared detector, completely cut off the infrared spoke of flame using optical means
The interference penetrated, compared to the prior art in using metal sleeve completely cut off method, optical means realize it is contactless, more succinctly,
Beauty, gas-cooker layout designs are more flexible；The infrared energy issued by timesharing detection the bottom of a pan emissivity α and the bottom of a pan itself
E1, thermometric infrared detector do not receive the light of calibration light source sending, avoid calibration light source to the bottom of a pan of infrared measurement of temperature detector
Thermometric interferes, and improves the accuracy of the cooking bottom temperature measured.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of gas-cooker anti-dry detection method, it is characterised in that: the described method includes:
(1) infrared radiation pulses are issued to the bottom of a pan by calibration light source, the infrared radiation pulses are red by correcting after the bottom of a pan is reflected
External detector receives, and is converted to electric signal V2；Calculate the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；Calculate the bottom of a pan
Emissivity α=1- β；
(2) calibration light source is closed；
(3) infrared energy that the bottom of a pan itself issues is received by thermometric infrared detector, and is converted to electric signal V1；According to
Electric signal V1 obtains the infrared energy E1 that the bottom of a pan itself issues；
(4) according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；
(5) judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；
If so, closing gas valve or alarm.
2. according to the method described in claim 1, it is characterized by: the wavelength for the infra-red radiation that calibration light source issues is located at thermometric
Within the receiving wave range of infrared detector.
3. according to the method described in claim 2, it is characterized by: in the thermometric infrared detector and correction infrared detector
On be mounted on optical filter, the optical filter is narrow-band pass filter, the central wavelength of the optical filter be in 3.4um~
Within the scope of 4.4um.
4. according to the method described in claim 1, it is characterized by: the detection method further include:
After closing calibration light source, judge whether to change pot according to the electric signal V1 that thermometric infrared detector exports；
If so, reopening calibration light source, the reflectivity in the bottom of a pan is detected again.
5. a kind of gas-cooker anti-dry detection device, it is characterised in that: include:
Calibration light source, for issuing infrared radiation pulses to the bottom of a pan；
Infrared detector is corrected, the infrared radiation pulses issued for receiving the calibration light source through the bottom of a pan reflection, and be converted to electricity
Signal V2；
Thermometric infrared detector, the infrared energy issued for receiving the bottom of a pan itself, and be converted to electric signal V1；
Computing module is inquired, for calculating the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；The emissivity α in the calculating the bottom of a pan=
1-β；The infrared energy E1 that the bottom of a pan itself issues is obtained according to electric signal V1；
Judgment module, for according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；Root
Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；If so, closing gas valve or alarm.
6. device according to claim 5, it is characterised in that: the wavelength for the infra-red radiation that calibration light source issues is located at thermometric
Within the receiving wave range of infrared detector.
7. device according to claim 5, it is characterised in that: in the thermometric infrared detector and correction infrared detector
On be mounted on optical filter, the optical filter is narrow-band pass filter, the central wavelength of the optical filter be in 3.4um~
Within the scope of 4.4um.
8. device according to claim 5, it is characterised in that: the inquiry computing module is also used to, infrared according to thermometric
The electric signal V1 of detector output judges whether to change pot.
9. a kind of gas-cooker, it is characterised in that: the anti-dry including burner and as described in any one of claim 5 to 8
Detection device.
10. gas-cooker according to claim 9, it is characterised in that: the anti-dry detection device is laid in burner
Side, towards the bottom of a pan central location；
Alternatively, offering light hole in the central location of the burner, the detection device is being laid in the light hole just
Lower section.
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| CN201810296732.8A CN110346044A (en) | 2018-04-03 | 2018-04-03 | A kind of gas-cooker anti-dry detection method, detection device and gas-cooker |
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| CN201810296732.8A CN110346044A (en) | 2018-04-03 | 2018-04-03 | A kind of gas-cooker anti-dry detection method, detection device and gas-cooker |
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Application publication date: 20191018 |