CN1082662C - Temperature measuring apparatus and method using thermopile sensor - Google Patents
Temperature measuring apparatus and method using thermopile sensor Download PDFInfo
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- CN1082662C CN1082662C CN 96112411 CN96112411A CN1082662C CN 1082662 C CN1082662 C CN 1082662C CN 96112411 CN96112411 CN 96112411 CN 96112411 A CN96112411 A CN 96112411A CN 1082662 C CN1082662 C CN 1082662C
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Abstract
An equipment and means for estimating the temperature using the thermopile senser, comprises a turntable located in the middle of a heating chamber for puting food, a sensor circuit for sensing the infrared rays radiated from the material to be cooked in the heating chamber, a control circuit for control every parts in order to suitablly cook the food using the data transfered from the sensor circuit, a reflector adjusting circuit for alter the plane reflector by recognizing the position of the material according to the data from the control circuit, a heating driver circuit for producing the electromagnetic wave to heat the food, and a a material-to-be-cooked temperature estimating circuit for estimating the temperature of the material to suitablly control the temperature of the material when the material has a small size and its temperature is scarcely detected.
Description
The invention relates to and utilize the thermopile sensor to carry out thermometric apparatus and method, especially, about utilizing the thermopile sensor, be placed on the quantity and the position of the food on the turntable by measurement, accurately determine the temperature measuring equipment and the method for the temperature of the food that will cook.
The thermopile sensor that utilizes that Fig. 1 illustrates a routine carries out thermometric device.Can be positioned at the turntable 12 that food 11 is placed on it the central authorities of heating chamber 10, well heater 13 produces microwave and comes 11, one heat driven devices of heat food, 14 control heaters 13.Thermopile sensor 15 is surveyed the temperature of the food 11 in heating chamber 10 by a temperature survey hole, and it is corresponding with deep edge on the turntable 12 that this hole is positioned at the top of heating chamber 10.Temperature detecting location driver 16 is made up of a timing belt (not illustrating on a figure) and stepper motor (not illustrating on the figure) etc., and changes temperature measuring positions by the position of control thermopile sensor 15.When thermopile sensor 15 not during the temperature of energy measurement food 11, barricade 17 and 18 shielding temperature survey hole air cooling fans 19 control barricades 17 and 18 and simultaneously thermopile sensor 15 is cooled off.Food temperature is surveyed and cooling fan controller 20 is surveyed the temperature of the food of being exported by thermopile sensor 15 11 and control cooling electric fan 19.Determiner (deteminer) 21 surveys according to food temperature and the output of cooling fan controller 20 is determined various piece is operated.
In operation, thermopile sensor 15 is by making voltage of average generation to all temperature in visible angle.Will be quite difficult if food 11, is so accurately measured the temperature of food 11 less than the visual angle of thermopile sensor 15.Therefore, a temperature detecting location driver 16, for example stepper motor links to each other with this thermopile sensor 15 with narrow visual angle, to change the temperature measurement range of thermopile sensor 15 by moving back and forth thermopile sensor 15.
Fig. 2 has described a method determining the food position when changing temperature measurement range.As the user place food 11 on the turntable 12 of the central authorities of the heating chamber 10 of a micro-wave oven and select one the cooking start button, then food temperature is surveyed and this signal of cooling fan controller 20 sensings, and provides a drive signal to drive the various piece of determiner 21.If the determiner 21 that receives drive signal is by producing microwave with heat driven device 14 control heaters 13, the turntable 12 in heating chamber 10 just rotates, and the food 11 that is placed on the turntable 12 also and then rotates together.If turntable 12 rotates, then determiner 21 just drives thermopile sensor 15 and temperature measuring positions driver 16 works together in succession.When changing the position of thermopile sensor 15 by actuation temperature measuring position driver 16, thermopile sensor 15 is just measured its temperature.When adopting when a to-and-fro movement of thermopile sensor 15 is divided into the stepper motor of 8 parts, be presented among Fig. 2 according to the reciprocating temperature survey zone of thermopile sensor 15.
When turntable 12 rotates once, thermopile sensor 15 just repeats its to-and-fro movement, and the All Ranges on the turntable 12 is measured temperature.A to-and-fro movement supposing thermopile sensor 15 is divided into 8 parts and thermopile sensor 15 to-and-fro movements 10 times when turntable 12 rotates a time, the number of the temperature data measured during rotating once of turntable 12 is 80 so, is added to 160 data that obtain on the position data corresponding to the turntable 12 of these temperature datas by 80 temperature datas that will measure and is stored in the storer.If the turntable that thermopile sensor 15 measures 12 rotates twice temperature data and the position data of turntable 12 is stored, and will rotate for the first time and record data and record data and compare with rotating for the second time, just can see a Temperature Distribution of turntable 12.If some positions are arranged on the turntable 12, be in the temperature that records when turntable 12 rotates for the second time with respect to for the first time tangible increase being arranged at this, can judge that thus food 11 is positioned at the position that temperature raises.The quantity of food 11 can be from turntable 12 be known the position data of the turntable 12 at temperature rising position.
Like this, if detect in the temperature data that the position of food 11 can record when utilizing stepper motor to make the continuous to-and-fro movement of thermopile sensor 15 and the position data of its corresponding turntable 12, then temperature detecting location driver 16 is fixed on thermopile sensor 15 on the position of food 11.Therefore, the temperature of the food 11 of each rotation all can be measured be come out.Thermopile sensor 15 is surveyed the temperature of food 11 and this temperature transition is become an electric signal.The signal of conversion is sent to food temperature and surveys and cooling fan controller 20.Food temperature is surveyed and the temperature of 20 pairs of foods 11 of cooling fan controller averages, and medial temperature is converted to a voltage, and this voltage is supplied to determiner 21.Determiner 21 is according to the temperature computation heat time heating time of food 11, and according to this heat time heating time control heater 13 so that finish whole automatic-cooking process.As time goes by, as cooling fan 19 heating, food temperature is surveyed and cooling controller of fan 20 produces a control signal, is used for cooling off cooling fan 19.
As mentioned above, utilize thermopile sensor 15 to measure in the method for temperature of food 11 at this, the edge of turntable 12 is pointed at visual angle with the sensor 15 at narrow visual angle, and the position of food 11 is to utilize the driver 16 of stepper motor for example by searching at some angle to-and-fro movement thermopile sensors 15 as shown in Figure 2.The temperature of food 11 can be fixed on by the ken with thermopile sensor 15 on the position of food 11, and each rotation of turntable 12 is measured.
Yet, accurately measure the temperature of any object in order to make thermopile sensor 15, if the time that the infrared ray of the object of measuring projects on the sensor 15 was at least 0.25 second or bigger, then the visual angle of sensor 15 should surpass minimum value 0.25 second in the time that each measured zone stops when the temperature survey of movable sensor 15 is regional.
If the ken of sensor 15 is divided into 8 parts for the radius of turntable 12,12 times of turning around of turntable are 10 seconds, and it is 0.25 second that a to-and-fro movement speed of sensor 15 is adjusted to the time that the visual angle that makes sensor 15 rests on each ken, then is shown among Fig. 3 according to the temperature measuring positions of the rotation of turntable 12 and the to-and-fro movement of sensor 15.
If food 11 is positioned at turntable 12 (e) position, the position of temperature marked change is on the turntable 12, the 7th and the tenth zone that the temperature data that 12 rotations of use turntable are twice and the position data of its corresponding turntable 12 of use detect.In this case, although food 11 be positioned at (d) and (e) on, away from the center of turntable 12, because the 7th and the tenth temperature survey of sensor 15 zone mainly contacts with food 11, so be positioned at (d) and the food 11 (e) located is judged to be mistakenly and is positioned at position (c).Therefore, because temperature measuring positions driver 16 is controlled (c) position that turntable 12 is pointed at the visual angle that makes sensor, food 11 is cooked with the temperature more much higher than desired temperatures.In other words, sensor 15 for example utilizes that the driver 16 of stepper motor moves back and forth, and the position of food 11 and quantity can be determined out by the measured zone that changes sensor 15.Therefore, owing to do not consider the time resolution characteristics of sensor 15 and the velocity of rotation of turntable 12, be difficult to this method is applied on the micro-wave oven.
When utilizing that for example the temperature detecting location driver of stepper motor makes the continuous to-and-fro movement of sensor measure the temperature of food, it is complicated that its sensing structure becomes, and the cost of this sensing cell is owing to having used stepper motor to rise.Therefore, use thermopile infrared ray sensor not a duck soup on micro-wave oven.When sensor under driver such as step motor drive during to-and-fro movement, the moving structure of the sensing difficulty that becomes, and because the mobile generation noise of sensor, the result produces the sensing mistake.
Thereby the present invention endeavours a kind of like this thermopile sensor that utilizes and carries out thermometric apparatus and method, and it has been eliminated in fact because the restriction of prior art and the not enough above-mentioned one or more problem of bringing.
The purpose of this invention is to provide one utilizes the thermopile sensor with temperature measuring equipment and the method for cooking food to desired temperatures.
Other features and advantages of the present invention will be further described hereinafter.Purpose of the present invention and other advantage are to realize and reach by the structure of describing in instructions, claim and the accompanying drawing.
For achieving the above object and advantage, of the present inventionly utilize the thermopile sensor to carry out thermometric device to comprise: be positioned at a turntable of heating chamber central authorities, be used for food is put thereon; Be used for the ultrared sensing circuit that the food in the sensing heating chamber radiates; Data of utilizing this sensing circuit to send are controlled each part so that the control circuit of suitably cooking; A catoptron regulating circuit is used for regulating plane mirror according to the data that produced by control circuit by the food position that observation is placed on the turntable; A heat driven circuit, the data that are used for producing according to control circuit are to produce the mode heat food of electromagnetism degree; A food temperature estimation circuit, be used for since the quantity of food very little and sensing during less than the temperature of food is suitably controlled the temperature of food by the estimation food temperature.
On the other hand, of the present inventionly utilize the thermopile sensor to carry out thermometric method to may further comprise the steps: initialization is used for determining the parameter of food position when cooking beginning; The sensor output voltage that produces via thermopile sensor and analog-digital converter is converted to temperature; After the cooking, calculate institute's time-consuming, if the cooking time first at interval in, close a solenoid, and calculate the temperature variation at the center of turntable; If the cooking time is connected this solenoid in second interval, and the temperature variation at calculating turntable edge; If the cooking time drops in the 3rd interval, the temperature of food and the temperature of turntable are compared; If the temperature of food than the temperature height of turntable, utilizes the temperature variation that measures to check that food is positioned in the central authorities or the limit of turntable of turntable.
The generality that is appreciated that the front is described and following detailed all is exemplary with indicative.The scope of the invention is limited by appended claims.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described in detail.
Fig. 1 is that the thermopile sensor that utilizes of a routine carries out the block scheme of temperature measuring equipment.
Fig. 2 shows when thermopile sensor temperature survey zone in the process of search food position during to-and-fro movement on turntable.
The sensing region of a reality when Fig. 3 shows the sensing region that uses the thermopile sensor and changes.
Fig. 4 is a block scheme that utilizes the thermopile sensor to carry out thermometric device according to of the present invention.
Fig. 5 shows an example of a plane reflection mirror driver that is shown among Fig. 4.
Fig. 6 shows the temperature survey zone according to the position of plane mirror that is shown among Fig. 4.
Fig. 7 shows the temperature sensing zone according to the thermopile sensor of the angle of rotation of plane mirror that is shown among Fig. 4.
Fig. 8 shows when the height of micro-wave oven is 23cm, the displacement of the sensing region of thermopile sensor.
Fig. 9 is a circuit diagram that is shown in the plane mirror driving governor among Fig. 5.
Figure 10 shows another example that is shown in a plane reflection mirror driver among Fig. 4.
Figure 11 is a circuit diagram that is shown in the plane mirror driving governor of Figure 10.
Figure 12 shows the another example of a plane reflection mirror driver that is shown in Fig. 4.
Figure 13 shows a temperature survey zone according to the position of the plane mirror that is shown in Figure 10.
Figure 14 shows and is used to describe the food of the ultimate principle of observing the food position and the temperature variation characteristic of turntable.
Figure 15 is a timing diagram that is used for sensing food position according to the present invention.
Figure 16 a and 16b be one according to the process flow diagram that utilizes the thermopile sensor to carry out thermometric process of the present invention.
Figure 17 a, 17b and 17c show the output variation diagram of sensor when food is positioned at the edge of turntable, wherein Figure 17 a is the situation when the food initial temperature is lower than turntable temperature, Figure 17 b is the situation when the food initial temperature is higher than turntable temperature, and Figure 17 c shows the sensor output variation diagram according to the food sample time that is positioned at the turntable edge.
Figure 18 shows the shape of the food that is positioned at sensing region.
Figure 19 shows the variation of a position according to small amounts of food in exporting in sensor.
Figure 20 shows the timing diagram of observing the food position.
Referring to Fig. 4, show one and utilize the thermopile sensor to carry out thermometric device.Wherein, turntable 12 is positioned at the central authorities of heating chamber 10 and is used for food is placed on it.The infrared ray that the food 11 of sensing circuit 100 sensings in heating chamber 10 radiates.The data that control circuit 200 utilizes sensing circuit 100 to send control various piece so that cooking food suitably; The data that catoptron regulating circuit 300 produces according to control circuit 200, plane mirror 37 is regulated in the position that is placed on the food 11 on the turntable 12 by observation; The data that heat driven circuit 400 produces according to control circuit 200 are by generating electromagnetic waves heat food 11; Food temperature estimation device 44 when because the quantity 11 of food is few so that sensings during less than the temperature of food 11, is controlled the temperature of food 11 rightly by the estimation food temperature.
Sensing circuit 100 comprises a condenser 33, and this condenser is made up of convex lens or recessed catoptron and is used for assembling the infrared ray that foods 11 radiate in the heating chamber 10; And a thermopile sensor 34, be used for the infrared ray that sensing condenser 33 sends.The infrared ray of sensing is converted to a voltage.
Control circuit 200 comprises an analog-digital converter 35, is used for the analog signal conversion that comes from thermopile sensor 34 is become numerical data; A microprocessor 36 is used to utilize the Data Control various piece that transmits from analog-digital converter 35 so that cooking food suitably; And a noise discriminator 43, be used for the sensing value that microprocessor 36 transmission come is left with the electric noise examination.
Catoptron regulating circuit 300 has plane mirror 37, is used for changing the ultrared path that radiates from food 11, and projects on the condenser 33; A plane reflection mirror driver 38 is used for driving this plane mirror 37; A food position determiner 39, the temperature variation data that are used for each sensing region of transmitting from microprocessor 36 are judged still central authorities of limit that food 11 is positioned at turntable 12; With a plane mirror driving governor 40, the supply that is used for controlling power supply is so that according to the position of being regulated plane mirror 37 by the position of the food 11 of food position determiner 39 sensings.
Heat driven circuit 400 comprises a well heater 41, is used for generating electromagnetic waves entering in the heating chamber 10; With a heat driven device 42, be used for the driving of control heater 41.
In operation, if the user is held in place food 11 on the turntable of central authorities of heating chamber 10, and select a cooking start button, microprocessor 36 to sense this operation and drive well heaters 41 via heat driven device 42.Enter heating chamber 10 if well heater 41 is driven and generates electromagnetic waves, then turntable 12 begins to rotate and and then rotation together of food 11.Cooked as food 11 when rotating, give off infrared ray and project on the condenser 33 via an infrared transmission hole from food 11.In this situation, plane mirror 37 changes ultrared path so that infrared ray projects on the condenser 33.Assemble these infrared rays by the condenser 33 that convex lens or concave mirror are formed, and the infrared ray of assembling is offered thermopile sensor 34.Condenser 33 narrows down the visual angle of thermopile sensor 34 and 0 its output voltage of raising.Thermopile sensor 34 converts infrared ray corresponding to the signal of an analog voltage and the signal that this was changed to and offers analog-digital converter 35.
Analog to digital converter 35 becomes analog signal conversion numeral and data is offered microprocessor 36.If microprocessor offers noise discriminator 43 to the data from analog to digital converter 35, noise discriminator 43 detects whether these data are noises, if these data are noises, noise discriminator 43 does not just produce data so; If not noise, noise discriminator 43 just offers heat driven device 42 and food temperature estimation device 44 to these data.Heat driven device 42 continues control heater 41, and therefore generating electromagnetic waves enters heating chamber 10.When food 11 during away from thermopile sensor 34, food temperature estimation device 44 estimates the temperature of food 11.The position of food 11 is by food location indentifier 39 sensings.Food location indentifier 39 offers plane mirror driving governor 40 to a control signal according to the position of the food 11 of sensing.In order to measure the temperature of turntable 12, microprocessor 36 produces the position that a signal is used for changing plane mirror 37, and food 11 is to locate according to the position and the plane mirror 37 of condenser 33 on turntable 12.So, the thermopile sensor zone of having the ability to measure therein temperature changes according to the position of plane mirror 37.That is to say, plane reflection mirror driver 38 according to the position adjustments plane mirror 37 of food 11 so that make in its central authorities or edge that point to turntable 12.
Plane reflection mirror driver 38 comprises that drives an iron plate 47 as shown in Figure 5, and it and plane mirror 37 are connected as a single entity so that thermopile sensor 34 is measured the temperature of the desired locations of turntable 12; A spring leaf 46 is used for supporting driving iron plate 47; Be used for moving driving iron plate 47 with one first solenoid 49.
In operation, if plane mirror 37 is positioned at A place as shown in Figure 6, thermopile sensor 34 is with regard to the temperature of the central authorities of energy measurement turntable 12 so.If plane mirror 37 is positioned at the B place, so with regard to the temperature of energy measurement to turntable 12 edges.If microprocessor 36 is supplied with plane mirror driving governor 40 to control signal by food location indentifier 39, then power supply is added to first solenoid 49 on the plane reflection mirror driver 38 from plane mirror driving governor 40.Therefore, just produce magnetic field around first solenoid 49, the driving iron plate 47 that is connected as a single entity with plane mirror 37 is subjected to magneticaction to touch first solenoid 49.In this case, plane mirror 37 is positioned at the B place, and as shown in Figure 6, the infrared ray that is come out by the fringe radiation of turntable 12 is incident on the thermopile sensor 34.Thermopile sensor 34 is with regard to the temperature on the edge of energy measurement food 11.
If power supply stops to supply with, drive iron plate 47 and under the restoring force effect of spring leaf 46, return to the original position.When plane mirror 37 during in the original position, the length of limit rotation plate 51 is determined the sensing region location that is used for to the thermopile sensor 34 of the central authorities that are positioned at turntable 12.Plane mirror 37 is positioned at the A place, and the infrared ray of the central authorities of turntable 12 incides on the thermopile sensor 34.Therefore, can measure the temperature of the central authorities of turntable 12.That is, if add power supply for first solenoid on the plane reflection mirror driver 38, the rotational angle of limit rotation plate 51 restriction plane mirrors 37.In addition, the displacement of this limit rotation plate 51 restrictions turntable 12 that can be sensed by thermopile sensor 34.Move according to the rotational angle of plane mirror 37 in the temperature sensing zone of thermopile sensor 34.Illustrate as Fig. 7 indication, the displacement d of the rotation angle α of plane mirror 37 and the sensing region of thermopile sensor 34 has following relation.
θ＝2*α，d＝tan(θ)
When the height of the heating chamber 10 of micro-wave oven is 23cm, as shown in Figure 8 according to the displacement of the thermopile sensor 34 of the angle of rotation α of plane mirror 37.If the angle of rotation of plane mirror 37 is 5 °, the mobile 4cm in the temperature survey of thermopile sensor 34 zone.If plane mirror 37 rotates 7.5 ° and 10 °, mobile respectively 6.16cm in the temperature survey zone of thermopile sensor 34 and 8.37cm.
As shown in Figure 9, plane mirror driving governor 40 comprises: a power switch circuit 40a is used for according to microprocessor 36 providing or to cut off the power supply of giving first solenoid 49 in order to drive the drive signal that plane mirror 37 produces.That is to say, if microprocessor 36 produces the high level of a 5V, the transistor Q1 of power switch circuit 40a connects and bypass over the ground, and another transistor Q2 connects and power supply is added to first solenoid 49.If microprocessor 36 produces the low level of a 0V, the transistor Q1 of power switch circuit 40a disconnects, and electric current is the base stage of inflow transistor Q2 not, and therefore, transistor Q2 disconnects.As a result, there is not power supply to supply with first solenoid 49, the temperature of the central authorities of thermopile sensor 34 sensing turntables 12.
If the temperature variation data of each sensing region that cooking beginning, food location indentifier 39 cause according to the rotation by turntable 12 judge that food 11 is positioned in the central authorities or edge of turntable 12.If food 11 is positioned on the limit of turntable 12, microprocessor 36 produces the high level of 5V regularly so that plane reflector driving governor 40 is operated.The voltage that produces impels plane mirror 37 to point to the edge of turntable 12 regularly.If food 11 is positioned at the central authorities of turntable 12, microprocessor 36 produces the low level of 0V regularly, and therefore, first solenoid 49 is failure to actuate, and plane mirror 37 points to the central authorities of turntable 12 regularly.If turntable 12 rotates the output change in oscillation of thermopile sensor 34.If turntable 12 rotates once per 10 seconds, the temperature of food 11 has only when food 11 sensed arriving just around the thermopile sensor 34 time.Because temperature can have a unexpected rising in the quantity of food 11 is after a little while during 10 seconds,, thereby suitably control the temperature of food 11 even temperature estimation device 44 also will be estimated the temperature of food 11 at food 11 during away from thermopile sensor 34.
Because micro-wave oven utilizes the electromagnetic wave of high output, promptly microwave comes cooking food, and weak voltage of thermopile sensor 34 generations, produces the noise that is caused by electromagnetic wave in 34 outputs of thermopile sensor.Noise discriminator 43 judges whether the signal that transmits from analog to digital converter 35 is noise.Noise occurs with this form, and when food 11 was heated by well heater 41, the temperature of food 11 rose always, or produced vibration by the ON/OFF of well heater 41, and maybe temperature descends always when not driven by well heater 41.
Figure 10 shows another example as the pointed plane reflection mirror driver 38 of Fig. 4.Drive iron plate 47 and be connected as a single entity with plane mirror 37, spring leaf 46 is being supported driving iron plate 47.First solenoid 49 moves driving iron plate 47, and an iron core 48 move left and right is within it arranged.One second solenoid 49a regulates the motion of the iron core 48 in first solenoid 49.First and second solenoids 49 are designed to when switching on relative with identical polar each other with 49a.
Figure 11 shows the pointed plane mirror driving governor 40 as Figure 10.If microprocessor 36 imposes on on-off circuit 40b to the 0V low level by output terminal P1 and P2, because electric current does not flow through the base stage of transistor Q1 and Q2, transistor Q1 and Q2 disconnect.Therefore, power supply is not added to first solenoid 49 and the second solenoid 49a, and drives the center that plane mirror 37 that iron plate 47 is connected as a single entity points to turntables 12.As the A place of Figure 13 indication, thermopile sensor 34 is measured the temperature at the center of turntable 12.If microprocessor 36 only produces the high level of 5V by output terminal P1, transistor Q1 connects so, and first switch SW 1 as shown in figure 10 is in on-state.Transistor Q2 disconnects, and second switch SW2 as shown in figure 10 is in off-state.Iron core 48 in first solenoid 49 is towards the motion of the iron core of the second solenoid 49a, and attaches the iron core 48 of first solenoid 49 with the driving iron plate 47 that plane mirror 37 is connected as a single entity.Therefore, plane mirror 37 is positioned at C place shown in Figure 13, and thermopile sensor 34 is measured the temperature of the more edge of turntable 12.If microprocessor 36 produces the 5V high level by output terminal P1 and P2, transistor Q1 and the Q2 of on-off circuit 40b all connect so, and first and second switch SW 1 shown in Figure 10 just SW2 all are in on-state.In such cases, first and second solenoids 49 and 49a produce magnetic field with opposite polarity.The iron core 48 of first solenoid 49 is repelled from the second solenoid 49a, and plane mirror 37 is positioned at B place shown in Figure 13.Therefore, thermopile sensor 34 is measured on the turntable 12 temperature in the zone of offset from center a little.
Figure 12 also shows another example of plane reflection mirror driver 38 as shown in Figure 4.Plane reflection mirror driver 38 comprises: a permanent magnet 52, and it and plane mirror 37 are connected as a single entity; With a rotation axis 53, it is used for supporting permanent magnet 52.The polarity of permanent magnet 52 first solenoidal polarity when power supply is added to first solenoid 49 is identical, so that during the position of control plane catoptron 37, the elasticity of spring leaf can change according to the ON/OFF repeatedly of first solenoid 49 when using spring leaf 46.In order to overcome the reliability variation of thermopile sensor 34, permanent magnet 52 is used for prolonging the life-span of thermopile sensor 34, and improves its reliability.
In operation, if power supply is not added to first solenoid 49, permanent magnet 52 is adsorbed on first solenoid 49 by the iron core 48 that is connected as a single entity with first solenoid 49.Plane mirror 37 points to the edge of turntable 12, and thermopile sensor 34 is measured the temperature at turntable edge.If first solenoid 49 adds power supply, the polarity identical with permanent magnet 52 of first solenoid 49 appears at the direction opposite with permanent magnet.Permanent magnet 52 separates mutually with first solenoid 49, and the plane mirror that is connected as a single entity with permanent magnet 52 points to the central authorities of turntable 12.Thermopile sensor 34 is measured the temperature of the central authorities of turntable 12.
Figure 14 shows the temperature variation characteristic of food 11 and turntable 12, just shows when food 11 is heated by magnetron in micro-wave oven the temperature variation curve of turntable 12 and food 11.As shown in Figure 14, when heat food 11, the temperature of food 11 rises faster than the temperature rising of turntable 12.Therefore, the position of food 11 can detect by the difference of utilizing the temperature rising between food 11 and the turntable 12.
Figure 15 illustrates the timing diagram of judging the position of food 11 on turntable 12.In Figure 15, tp is that thermopile sensor 34 replaces the central authorities of sensing turntable 12 and the sensing time cycle at edge, and the time that j is experienced after representing to begin to cook promptly cooks and opens the beginning elapsed-time standards, and k deducts j is removed the merchant of gained by tp a numerical value from j.Time R1 is a sensing range between k0 and the k1, is used for the temperature of central authorities of sensing turntable 12.Time R2 is at first and second sensing ranges between k1 and the k2 at interval, is used for the temperature at sensing turntable 12 edges.After representing to cook, minimum elapsed-time standards tc carries out a required minimum time of food determining positions algorithm.The 3rd at interval k3 be used for judging the position of food 11 and deciding the sensing region of thermopile sensor 34 by first solenoid 49 on the operation planar mirror drive device 38 according to the temperature data at the central authorities of turntable 12 and edge.Sense period tp is arranged to double the time that turntable 12 rotates a week.If the time that turntable 12 rotates a week is 10 seconds, sense period tp is exactly 20 seconds.The very first time, interval k1 was used for being provided with a time, and the enough thermopile sensors 34 of this time energy are discerned the temperature variation of the central authorities of turntable 12 fully.When food 11 is positioned at turntable 12 central, the output of thermopile sensor 34 and nonoscillatory and rise ideally always.Therefore, very first time interval k1 is arranged to be shorter than the time that turntable 12 rotates weeks, that is, and for example 5 seconds.Second time interval k2 is arranged to the time that turntable 12 rotates weeks, so that can be with thermopile sensor 34 temperature variation on sensing turntable 12 edges fully.If it is 10 seconds that turntable rotates the time in a week, second time interval k2 is set to 10 seconds so.The 3rd time interval k3 is between second time interval k2 and sense period time tp.If sensing cycle tp is 20 seconds, second time interval k2 is 15 seconds, and then the 3rd time interval k3 is set to a value between 15 seconds and 20 seconds.Minimum elapsed-time standards tc is set to be less than the central authorities of turntable 12 and the alternately value of the twice of sense period time tp at edge.For example, sense period tp is 20 seconds, and k1 is 5 seconds, and k2 is 15 seconds, and k3 is 18 seconds, minimum elapsed-time standards Tc between 35 (=tp+k2) second and 38 (=tp+k3) between second.
Based on the procedural representation of the position of above-mentioned parameter and time sensing food 11 in Figure 16 a and 16b.If the user selects the cooking to open the beginning button, these parameters of microprocessor 36 initialization are so that the position (step S101) of identification food 11.First solenoid 49 on the microprocessor 36 closing plane mirror drive devices 38 is also operated as magnetron well heater 41 simultaneously.Well heater 41 carries out work, and the food 11 on the turntable 12 is heated.The infrared ray that radiates from food 11 is added to condenser 33, and the sensor output voltage that produces via thermopile sensor 34 and analog to digital converter 35 is converted into Current Temperatures T (step S102).Utilization is stored in the microprocessor 36 the sense period tp in the storeies and opens the beginning from the cooking and last a j and can calculate parameter K (=j-j/tp) (step S103).Check whether so that judge parameter identification be 0 (step S104).If this sign is 1, food 11 is judged as and is in the sensed state in position and carries out heating control algolithm (step S105).If this is designated 0, with checking whether parameter k falls in the very first time interval k1 (step S106).If parameter k drops in the very first time interval k1, in other words, if parameter k drops among the time R1, first solenoid 49 is closed, the temperature of the central authorities of turntable 12 sensed (step S107).Minimum temperature TCmin and maximum temperature TCmax at time R1 are calculated (step S108-S111).The difference TC that calculates the maximum temperature Tcmax of gained and be stored between the maximum TpCmax in this storer is calculated (step S112).
If parameter k drops between the first interval k1 and the second interval k2 (step S113), in other words, parameter k drops among the time R2, and first solenoid 49 is in on-state, the temperature at the edge of turntable 12 sensed (step S114).Minimum temperature TSmin and maximum temperature TSmax at time R2 are calculated (step S115-S118).The difference TS that calculates the maximum temperature TSmax of gained and be stored between the maximum temperature TpSmax in the storer is calculated, and calculates the difference Tsv (step S119 and S120) between maximum temperature values TSmax and the minimum temperature value TSmin.Maximum temperature values TpCmax and TpSmax are stored in (step S121) in the storer as the maximum temperature values among the one sense period tp of front.
If parameter k is the 3rd time interval k3, then checks to cook and whether open beginning elapsed-time standards j greater than the minimum elapsed-time standards TC that is stored in the storer.If, the position of judgement food 11.In order to judge the position of food 11, the temperature of the temperature of food 11 and turntable 12 is compared, and check whether the temperature of food 11 is higher than the temperature of turntable 12.Have only after the temperature height of temperature than turntable 12 of food 11, just judge the position of food 11.
Shown in Figure 17 b, if the temperature of the initial temperature of food 11 and turntable 12 quite or be higher than the temperature of turntable 12, the vibration width of sensor output increases along with the passage of cooking time, if the initial temperature of food 11 is lower than the temperature of turntable 12, the vibration width of sensor output reduces, increase once more up to the temperature of the temperature of turntable 12 and food 11 width that quite and then vibrates, shown in Figure 17 a.Therefore, the increase of vibration width/reducing can be by comparing T
SVAnd T
PSVLearn (T here
PSVBe the T of previous sense period in the time
SVAnd the increase by this vibration width (=TSmax-TSmin)) ,/reduce to judge whether the position of food 11 can carry out sensing in the current time.If food 11 is positioned at the center of turntable 12, sensor output vibration hardly.Therefore, food 11 whether be positioned at the central authorities of turntable 12 can be by more current maximum temperature values and the difference T between the minimum temperature value
SVWith the maximum temperature values of previous sense period in the time and the difference T of temperature value
PSVLearn.
Therefore, T
SVWith T
PSVCompare (step S125).If T
SVGreater than T
PSV, can judge that the temperature of food 11 is higher than or is equivalent to the temperature of turntable 12.Difference between the variable quantity TC of the maximum temperature when the variable quantity TC of maximum temperature that will be when the center of thermopile sensor 34 sensing turntables 12 and the edge at thermopile sensor 34 sensing turntables 12 compares (step S127) with a constant C 1 that is stored in storer, if the difference between the maximum temperature variation (=TC-TS) greater than constant C 1, since big at the temperature variation of turntable 12 central authorities, can judge the central authorities that food 11 is positioned at turntable 12.First solenoid 49 is in closed condition, and the central authorities (step S128) of thermopile sensor 34 sensing turntables 12.If the difference between maximum temperature variation (TC-TS) is less than constant C 1,, can judge on the edge that food 11 is positioned at turntable 12 because the temperature variation on the turntable edge is big.First solenoid 49 is in on-state, the edge (step S129) of thermopile sensor 34 sensing turntables 12.
The ideal value that is stored in the constant C 1 in the storer is 1, yet, if food 11 is positioned on the edge of turntable 12, and the sample time of the temperature of food 11 be not enough little, then the maximum temperature values of food 11 may be by not sensed exactly, shown in Figure 17 c.In a preferred embodiment, constant C 1 is arranged to 0.1.
If T
SVBe lower than T
PSV, this situation is when the Current Temperatures of the food 11 at the edge that is positioned at turntable 12 is lower than the temperature of turntable 12, or when the food 11 of the central authorities that are positioned at turntable 12 has irregularly shaped or a small sensing mistake is arranged.In order to distinguish this two kinds of situations, TpSmax and TSmin+C3 are compared, C3 is a constant that is stored in the storer.Because TpSmax is the maximum temperature values at previous sensing intermediate station cycle length 12 edges, TSmax is the maximum temperature values at current sense period time intermediate station 12 edges, so if food 11 is positioned at the central authorities of turntable 12, the output of thermopile sensor 34 is vibration and rising always ideally not.Therefore, TSmin is always greater than TpSmax.
Yet even food 11 is positioned at the central authorities of turntable 12, when the edge of thermopile sensor 34 sensing turntables 12, the output of sensor changes along with a small sensing location and vibrates.Consider this vibration factor, constant C 3 is set to 3.
If TpSmax, can judge that the temperature of food 11 is lower than the temperature of turntable 12 greater than TSmin+C3.Only after being higher than the temperature of turntable 12, the temperature of food 11 just judges the position of food 11.If TpSmax less than TSmin+C3, can judge the center that food 11 is positioned at turntable 12.First solenoid 49 is in and closes so, the central temperature of turntable 12 sensed (step S130).
If judged the position of food 11, then parameter identification is configured to 1 so that do not carry out food determining positions algorithm (step S132).
In a word, the food 11 on turntable 12 is heated by the work of well heater 41, and is added to condenser 33 from the infrared ray that food 11 radiates.The sensor output voltage that produces by thermopile sensor 34 and analog to digital converter 35 is converted into Current Temperatures T.Utilization be stored in microprocessor 36 internal storage sensing tp cycle length from the cooking open beginning elapsed-time standards j calculate parameter k (=j-j/tp), and check this parameter identification.If this is designated 0, then check parameter k.
If parameter k is in the first interval k1, first solenoid 49 is closed, and the temperature at the center of turntable 12 is sensed.Minimum temperature value TCmin and maximum temperature values TCmax in this interval are calculated.And calculate calculate gained maximum temperature values TCmax and be stored in difference TC between the maximum temperature values TpCmax in the storer (=TCmax-TpCmax).
If parameter k drops between the first interval k1 and the second interval k2, first solenoid 49 is connected, and the temperature on the edge of turntable 12 is sensed.Calculate minimum temperature value TSmin and maximum temperature values TSmax in this time interval.Calculate the maximum temperature values TSmax of gained and be stored in difference TS between the maximum temperature values TpSmax in the storer (=TSmax-TpSmax) and the difference T between maximum temperature values TSmax and the minimum temperature value TSmin
SV(-TSmax-TSmin) calculated.
If parameter k is in the 3rd interval k3, and if cook and open beginning elapsed-time standards j greater than the minimum elapsed-time standards tc that is stored in the storer, then with current maximum temperature values with as the difference T between the minimum temperature value of glue
SVAnd the maximum temperature values of last sensing cycle length and the difference T between the minimum temperature value
PSVCompare.If T
SVGreater than T
PSV, the temperature that can judge food 11 is higher than or is equivalent to the temperature of turntable 12.Maximum temperature variation TC and the difference between the maximum temperature variation Ts when thermopile sensor 34 sensing turntables 12 edges when the center of thermopile sensor 34 sensing turntables 12 are compared with the C1 that is stored in the storer.If difference (=TC-TS) greater than constant C 1, judge the central authorities that food 11 is positioned at turntable 12, first solenoid 49 is closed and the central authorities of thermopile sensor 34 sensing turntables 12.If difference (T
C-T
S) less than constant C l, judge on the edge that food 11 is positioned at turntable 12, first solenoid 49 is connected and the edge of thermopile sensor 34 sensing turntables 12.
If T
SVBe lower than T
PSV, then compare TpSmax and TSmin+C3.If TpSmax, judges the temperature that the temperature of food 11 is lower than turntable 12 greater than TSmin+C3.After being higher than the temperature of turntable 12, the temperature of food 11 just judges the position of food 11.If TpSmax, judges the central authorities that food 11 is positioned at turntable 12 less than TSmin+C3.Then first solenoid 49 is closed, and the temperature of the central authorities of turntable 12 is sensed.If judgement has been made in the position to food 11,, parameter identification do not carry out food determining positions algorithm thereby being set to 1.
If the position of food 11 is observed, food location marker 39 adds to plane reflection mirror driver 38 to drive signal by plane mirror driving governor 40.Plane reflection mirror driver 38 drives and catoptron 37 is fixed on the position of food 11.If the infrared ray that food 11 radiates incides on the condenser 33 by plane mirror 37, condenser 33 is assembled these infrared rays and infrared ray is sent to thermopile sensor 34.Arrive this, finished aforesaid operation.
Another example of identification food position is presented at Figure 18, in 19 and 20.
About Figure 18, reference symbol A and B indicate the temperature sensing zone of thermopile sensor 34, in other words, and the temperature sensing zone of correspondence when A that expression is shown in Fig. 6 when plane mirror 37 is arranged in and B point.Reference symbol (a), (b), and (c) respectively the expression when small amounts of food the central authorities of turntable 12, between turntable 12 central authorities and edge a zone and be positioned on the edge of turntable 12.Because a large amount of foods are distributed in the wide zone on the turntable, it is desired that food location indentifier 39 degree of accuracy are less than the temperature of measuring food 11.But the position of small amounts of food should be by sensing exactly so that make the sensing region of thermopile sensor 34 equal the position of food 11.If the sensing region of thermopile sensor 34, does not have sensor output variable quantity at the A place.If the sensing region of thermopile sensor 34 is at the B place, sensor output changes with the position of food 11.
The situation that the output that Figure 19 illustrates sensor changes with the position of small amounts of food.Along with the central authorities of food 11 near turntable 12, the vibration width becomes big, as shown in (b) among the figure.If food 11 becomes away from the center of turntable 12, the vibration width diminishes, shown in (c) among the figure.
The sensor output voltage that produces by thermopile sensor 34 and analog to digital converter 35 is converted into Current Temperatures T.If the cooking time is in the time interval R1 between t1 shown in Figure 20 and t2, microprocessor 36 drives well heaters 41 and also connects first solenoid 49 to measure the lip temperature of turntable 12.The maximum of T max and the minimum value Tmin of the lip temperature of the turntable 12 that records are calculated.In order to calculate the vibration width of the sensor output in the R3 of interval, utilize first parameter k1 that is stored in the storer to calculate a B parameter:
B＝(Tmax-Tmin)*k1
The first parameter value k1 considers the velocity of rotation of sample time and turntable 12 and definite.This first parameter value k1 is set to an enough big value, so that do not cause the change of B parameter along with the small vibration of the sensor output of the rotation of turntable 12; K1 also is set to an enough little value, does not ignore the vibration of sensor output when smaller with the temperature difference between convenient food 11 and the turntable 12.If the cooking time is that well heater 41 is not driven in the time interval R2 between t2 and t3, and first solenoid 49 is closed to measure the temperature of turntable 12 central authorities.The mean value TC of the central temperature of the turntable 12 that measures is calculated.Well heater 41 is not driven at interval in the R3 if the cooking time is between t3+td and t4+td one, and first solenoid 49 is connected to measure the temperature T 1 at turntable 12 edges.The number of the state of the difference of edge temperature T 1 and central temperature T C during greater than B parameter is stored in the storer as controlled variable Cnt.The lip temperature T1 of turntable 12 and the maximum of T dmax of the difference between the central temperature T C are calculated.
If maximum of T dmax then compares controlled variable Cnt greater than the second parameter value k2 with k5 and k6.If controlled variable Cnt is between k5 and k6, first solenoid 49 is closed to measure the temperature of turntable 12 central authorities.If not, first solenoid 49 is connected to measure the lip temperature of turntable 12.In this case, it is relevant that the sample time of k5 and k6 and microprocessor 36 and turntable 12 rotate the time in weeks.If small food portion is positioned at the edge of turntable 12, then rotate a circle half of time of the temperature sensing time ratio turntable 12 of food also will be lacked.For example, the time that turntable 12 rotates weeks is 10 seconds, and be 1 second the sample time of microprocessor 36, and the sensed time of temperature of small food portion that is positioned at the edge of turntable 12 is less than 5 seconds.Therefore, k6 is set to half that turntable 12 rotates all required times.Even food 11 is positioned at the central authorities of turntable 12, sensor output may cause small vibration along with the shape or the kind difference of food 11.Therefore, k5 should be taken into account small vibration and is provided with.If the maximum of T dmax of the temperature T 1 at turntable 12 edges and the difference between the central temperature TC is less than the second parameter k2, then initialization value is that 0 time td is re-set as k3, and B is re-set as k4 and Cnt is rearranged into 0.After the time td, the algorithm of R3 is done at interval.
As mentioned above, the position of food can accurately judge with plane mirror on the turntable, and therefore, food is cooked on the desired temperatures.The temperature of small food portion also can be measured exactly on the turntable.By using plane mirror, microwave oven structure can be oversimplified, and manufacturing cost can lower.
For a person skilled in the art, can carry out thermometric apparatus and method to thermopile sensor of the present invention and make amendment and change, and not break away from spirit of the present invention and scope.In claims all cover these modifications and variations.
Claims (21)
1, a kind of thermopile sensor that utilizes carries out thermometric device, comprising:
A turntable that is positioned at heating chamber central authorities is used for food is placed on it;
A sensing circuit is used for the infrared ray that food in the described heating chamber of sensing radiates;
A heat driven circuit is used for by generating electromagnetic waves heat food; And
Described heat driven circuit controlled by a control circuit, the data of utilizing described sensing circuit to transmit so that cooking food suitably;
It is characterized in that this utilizes the thermopile sensor to carry out thermometric device and also comprises:
A catoptron regulating circuit is used for regulating plane mirror according to the data from described control circuit generation by the position of observing food on the described turntable; And
A food temperature estimation circuit is used for when the quantity owing to food can not sense the temperature of food very little, suitably controls the temperature of food with the method for temperature of estimation food.
2, temperature measuring equipment as claimed in claim 1, wherein said sensing circuit comprises:
A condenser is used for assembling the infrared ray that the food in the described heating chamber radiates;
A thermopile sensor is used for infrared ray that sensing sends from described condenser and the infrared ray of sensing is converted to a voltage.
3, the thermopile sensor that utilizes as claimed in claim 1 carries out thermometric device, and wherein said control circuit comprises:
An analog to digital converter is used for the analog signal conversion that the thermopile sensor sends is become numerical data;
A microprocessor, the data that are used to utilize analog to digital converter to send control described catoptron regulating circuit and heat driven circuit so that cooking food suitably,
A noise discriminator is used for judging whether the sensing value that transmits from described microprocessor is electric noise.
4, the temperature measuring equipment described in claim 1, wherein said catoptron regulating circuit comprises:
A food location indentifier is used for discerning the position that is placed on the food on the described turntable according to the sensor output data that transmits from described microprocessor;
A plane mirror is used for changing from food and radiates and incide ultrared path on the condenser;
A plane reflection mirror driver is used for driving described plane mirror;
A plane mirror driving governor, the position according to by the food of food location indentifier sensing imposes on the plane reflection mirror driver to drive signal.
5, the temperature measuring equipment described in claim 4, wherein said plane reflection mirror driver comprises:
First and second solenoids of switch by described plane mirror driving governor control;
A solenoid supporter is used for supporting described first solenoid;
One drives iron plate and spring leaf, moves according to first and second solenoidal the opening or closing;
A limit rotation plate is used for according to the first and second solenoidal angles of rotation that limit plane mirror that open or close, and restriction is by the displacement in the zone on the turntable of thermopile sensor sensing.
6, the temperature measuring equipment described in claim 2, wherein said condenser comprise convex lens or a concave mirror.
7, the temperature measuring equipment described in claim 4, wherein said plane reflection mirror driver comprises:
One first solenoid opens or closes according to the control of plane mirror driving governor;
A solenoid supporter is used for supporting first solenoid;
One drives iron plate and a spring leaf, moves according to first solenoidal the opening or closing;
A limit rotation plate, according to the first solenoidal angle of rotation that limits plane mirror that opens or closes, and restriction is by the displacement in the zone on the turntable of thermopile sensor sensing.
8, the temperature measuring equipment described in claim 4, the position of wherein said plane mirror driver control plane mirror is so that the thermopile sensor measurement goes out the temperature at turntable central authorities and edge.
9, the temperature measuring equipment described in claim 4, the temperature variation at wherein said turntable central authorities and edge are to utilize the vibration width of sensor output to obtain.
10, the temperature measuring equipment described in claim 4, wherein said plane mirror driving governor comprises: an on-off circuit, the output of microprocessor that is used for being used for driving according to generation the drive signal of plane mirror comes the switch solenoid.
11, the temperature measuring equipment described in claim 5, the wherein said first and second solenoidal identical polars are reverse direction towards each other.
12, the temperature measuring equipment described in claim 7 wherein replaces driving iron plate and spring leaf with permanent magnet.
13, the temperature measuring equipment described in claim 12, wherein said permanent magnet and solenoidal identical polar be reverse direction towards each other.
14, temperature measuring equipment as claimed in claim 1, wherein said driving iron plate, spring leaf and plane mirror are to be connected as a single entity.
15, the temperature measuring equipment described in claim 10, wherein said on-off circuit comprises:
With joining first resistance of microprocessor and first switch;
The second and the 3rd resistance with first switch in parallel;
Be connected in the second switch between second, third resistance and the described solenoid.
16, the temperature measuring equipment described in claim 15, wherein said first and second switches adopt transistor.
17, the temperature measuring equipment described in claim 10, wherein said on-off circuit comprise each resistance and the switch that is connected between described microprocessor and a plurality of solenoid.
18, a kind of thermopile sensor that utilizes carries out thermometric method, may further comprise the steps:
When cooking beginning, initiation parameter is so that discern the position of food, and a sensor output voltage that produces by thermopile sensor and analog to digital converter converts temperature to;
Calculate the time of cooking beginning back experience, if the cooking time is in first time interval, closed solenoid, and calculate the temperature variation at turntable center;
If the cooking time is in second time interval, connect solenoid, calculate the temperature variation at the edge of turntable, if the cooking time is in the 3rd time interval, the temperature of the temperature of food and turntable is compared; And
If the temperature of food is higher than the temperature of turntable, utilizes the temperature variation that measures to detect food and be positioned on the center or edge of turntable.
19, thermometry as claimed in claim 18, the wherein said very first time is wanted long enough at interval so that detect the temperature variation at turntable center.
20, the thermometry described in claim 18, wherein said second time interval is the time that described turntable rotates a week.
21, the thermometry described in claim 18 further comprises:
If the temperature of food is lower than the temperature of described turntable, judgement is not done in the position of food be higher than the latter up to the former;
Measure the temperature in the zone that judges on the described turntable.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR31617/95 | 1995-09-25 | ||
| KR1019950031617A KR0176842B1 (en) | 1995-09-25 | 1995-09-25 | Apparatus and method for measuring temperature using thermofile sensor |
| KR35151/95 | 1995-10-12 | ||
| KR1019950035151A KR0152805B1 (en) | 1995-10-12 | 1995-10-12 | Temperature measuring apparatus using thermofile sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1155656A CN1155656A (en) | 1997-07-30 |
| CN1082662C true CN1082662C (en) | 2002-04-10 |
Family
ID=26631285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96112411 Expired - Fee Related CN1082662C (en) | 1995-09-25 | 1996-09-25 | Temperature measuring apparatus and method using thermopile sensor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2721827B2 (en) |
| CN (1) | CN1082662C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100672342B1 (en) * | 2006-01-25 | 2007-01-24 | 엘지전자 주식회사 | Auto-control method of temperature sensing circuit in cooking machine |
| CN101258989B (en) * | 2007-03-09 | 2012-09-19 | 刘小勇 | Fire controlling method and device |
| CN101750169B (en) * | 2008-12-04 | 2013-09-11 | 乐金电子(天津)电器有限公司 | Measuring method for unfrozen object in microwave oven |
| WO2013098003A1 (en) | 2011-12-26 | 2013-07-04 | Arcelik Anonim Sirketi | Oven with infrared sensor |
| CN104568225B (en) * | 2014-12-10 | 2017-09-05 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of moving object temperature field measurement device and thermal field synthetic method |
| CN104758184A (en) * | 2015-03-13 | 2015-07-08 | 东莞捷荣技术股份有限公司 | Intelligent feeding bottle cover |
| CN110297512B (en) * | 2018-03-22 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Temperature control method and device for cooking appliance, cooking appliance and storage medium |
-
1996
- 1996-09-25 CN CN 96112411 patent/CN1082662C/en not_active Expired - Fee Related
- 1996-09-25 JP JP25353196A patent/JP2721827B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09145060A (en) | 1997-06-06 |
| JP2721827B2 (en) | 1998-03-04 |
| CN1155656A (en) | 1997-07-30 |
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