JP5270405B2 - Temperature detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately measure the temperature of a cooking vessel being an object of temperature measurement or detection in a range from a low temperature to a high temperature for example even if the cooking vessel is a pan belonging to non-gray substances, a pan belonging to gray substances, or a low-emissivity type pan. <P>SOLUTION: Based on results of the comparison between temperatures T1 and T2 acquired by using the value of an infrared intensity signal (infrared intensity "A") output from a first infrared light receiving element 19, and the value of an infrared intensity signal (infrared intensity "B") output from a second infrared light receiving element 21, and between the voltage value "Vout" of a received light pulse signal output from an infrared light receiving element 28 and a second threshold "SH2", it is determined which one the cooking vessel 2 put on a trivet 7 is, out of an organic silicon type coated pan, a pan belonging to non-gray substances such as an alumite pan, a black-coated pan, a pan belonging to gray substances such as a silver-coated pan, and a pan belonging to a low-emissivity type such as a stainless pan. The temperature is calculated and detected by a temperature calculation method suited to the material of the cooking vessel 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a temperature detection device and a temperature detection method for detecting the temperature of an object to be measured in a non-contact state, and in particular, the bottom surface temperature or heating of a cooking utensil such as a pan or a frying pan heated by energy such as gas or electricity. The present invention relates to a temperature detection device that detects the temperature of an object to be heated such as cooked food in a non-contact manner.

  Various temperature measuring techniques for measuring the surface temperature (hereinafter simply referred to as “temperature” as appropriate) of an object to be measured (hereinafter referred to as “measurement object”) in a non-contact state have been known. Here, since the object to be measured radiates energy in the infrared region depending on its temperature, in order to measure the temperature of the object to be measured in a non-contact state, the infrared light emitted from the object to be measured using an infrared sensor. It is common to measure strength.

  If the object to be measured is a cooking utensil such as a pan or a frying pan, the temperature of the cooking utensil is calculated based on the detected infrared intensity, and gas or electricity is used to maintain the cooking vessel temperature at the set temperature. In order to control the heating means or to avoid an excessive temperature rise of the cooking container, processing such as stopping the heating operation by the heating means is performed.

  The present invention has been made in view of the above circumstances, and the emissivity is low, such as a stainless steel pan, whether the cooking container is a black body, a gray body, or a non-gray body. Even if it is a material, it aims at providing the temperature detection apparatus which can measure the temperature of the container for cooking from the low temperature to the high temperature with high precision.

  In order to achieve the above object, the present invention (Claim 1) is a temperature detection device for detecting the temperature of an object to be measured in a non-contact state, and is emitted from the object to be measured according to the surface temperature thereof. Radiated light detecting means for detecting infrared intensity in two different wavelength regions in the infrared region, infrared irradiating means for irradiating the object to be measured with infrared light in a predetermined wavelength region, and the infrared light irradiating means Infrared light receiving means arranged to receive the reflected light from the object to be measured in infrared, and the temperature for detecting the temperature of the object to be measured based on the output of the radiated light detecting means and the output of the infrared light receiving means Detecting means, wherein the temperature detecting means calculates a first temperature based on the infrared intensity of the first wavelength region in the two wavelength regions emitted from the object to be measured, and A second temperature is calculated based on an infrared intensity in a second wavelength region that is longer than the first wavelength region in the two wavelength regions radiated from a fixed object, and (a) the second temperature is the first temperature When the temperature is higher than the temperature, the object to be measured is regarded as a non-gray body, the temperature of the object to be measured is calculated based on the infrared intensity of the second wavelength region of the non-gray body, and (b) the first When the temperature is equal to or lower than the first temperature and the output value of the infrared light receiving means when the infrared irradiation means is on is equal to or smaller than a preset threshold value, the object to be measured is a gray body. The temperature of the object to be measured is calculated based on an infrared intensity ratio between the first wavelength region and the second wavelength region of the gray body, and (c) the infrared light reception when the infrared irradiation unit is turned on. Means output value is more than the threshold value If so considered the object to be measured with a low emissivity material, calculates the temperature of the object to be measured based on the infrared intensity of the second wavelength region of the low emissivity material is characterized by.

  According to the present invention (Claim 2), in the temperature detection device according to Claim 1, the radiated light detection means has a small variation range or wavelength with a small change in emissivity with respect to a change in wavelength of the object to be measured. Infrared intensity for the first wavelength region set in the large variation range and infrared light for the second wavelength region set in the small variation range corresponding to a large variation range in which the change in emissivity with respect to the change is large And calculating the first temperature in the temperature detecting means, the infrared temperature in the first wavelength region with respect to the temperature change of the reference body whose emissivity is known in advance. Corresponds to the same infrared intensity as that emitted from the object to be measured based on the correlation characteristic indicating the change and the infrared intensity for the first wavelength region emitted from the object to be measured. The temperature of the reference body is the first temperature, and the temperature detection means calculates the second temperature by the temperature detection means changing the infrared intensity in the second wavelength region with respect to the temperature change of the reference body. And the temperature of the reference body corresponding to the same infrared intensity as the infrared intensity emitted from the object to be measured, based on the correlation characteristic indicating the infrared intensity of the second wavelength region emitted from the object to be measured. The second temperature is used.

  According to the present invention (Claim 3), in the temperature detection device according to Claim 1 or 2, the first wavelength region is selected from a range of 3.1 to 4.2 μm, and the second The wavelength region is selected from the range of 8.0 to 20.0 μm.

  Further, according to the present invention (Claim 4), in the temperature detection device according to any one of Claims 1 to 3, when the object to be measured is regarded as a non-gray body, the temperature of the object to be measured is The emissivity is calculated in the range of 0.8 to 0.95.

  Further, according to the present invention (Claim 5), in the temperature detection device according to any one of Claims 1 to 3, when the object to be measured is regarded as a low emissivity body, the temperature of the object to be measured is The emissivity is calculated within a range of less than 0.3.

  Further, according to the present invention (Claim 6), in the temperature detection device according to any one of Claims 1 to 5, the output value of the infrared light receiving means is higher than a predetermined value when the infrared irradiation means is turned on. If it is smaller, a warning signal indicating that the object to be measured does not exist at the temperature measurement position is output.

  According to the present invention (Claim 7), in the temperature detection device according to any one of Claims 1 to 6, the object to be measured is heated by being supplied with electrical, magnetic energy, or combustion energy such as gas from the outside. Cooking utensils such as pans and frying pans, or food to be heated on the cooking utensils.

  In the temperature detection device of the present application, even if the cooking container is a black body, a gray body, or a non-gray body, or a material having a low emissivity such as a stainless steel pan, the cooking container The temperature of the cooking container can be measured with high accuracy from a low temperature to a high temperature without setting the emissivity of the substance constituting the.

It is a schematic block diagram which shows an example of the cooking installation using one form of the temperature detection apparatus by this invention. It is a flowchart which shows the operation example of the cooking equipment shown in FIG. It is an emissivity / wavelength graph which shows the relationship between the emissivity of a black body furnace and each pan material, and a wavelength. It is a graph which shows the infrared emission spectrum radiated | emitted from a black coating pan. It is a graph which shows the radiation spectrum of the infrared rays radiated | emitted from a silver paint pan. It is a graph which shows the infrared radiation spectrum radiated | emitted from an alumite pan. It is a graph which shows the emission spectrum of an infrared component among the lights radiated | emitted from a flame. It is a graph which shows the relationship between the intensity | strength of the infrared rays radiated | emitted from a blackbody furnace, and temperature. It is a graph which shows the relationship between the intensity | strength of the infrared rays radiated | emitted from a black coating pan, and temperature. It is a graph which shows the relationship between the intensity | strength of the infrared rays radiated | emitted from a silver paint pan, and temperature. It is a graph which shows the relationship between the intensity | strength of the infrared rays radiated | emitted from an alumite pan, and temperature. It is a graph which shows the relationship between the infrared intensity ratio of the infrared rays radiated | emitted from a black paint pan, a silver paint pan, and an alumite pan, and temperature. It is a graph which shows the relationship between the drive pulse signal applied to an infrared light emitting element in the state which removed the cooking container, and the light reception pulse signal output from an infrared light receiving element. It is a graph which shows the relationship between the drive pulse signal applied to an infrared light emitting element, and the light reception pulse signal output from an infrared light receiving element in the state which set the black coating pan as a cooking container. It is a graph which shows the relationship between the drive pulse signal applied to an infrared light emitting element, and the light reception pulse signal output from an infrared light receiving element in the state which set the alumite pan as a cooking container. It is a graph which shows the relationship between the drive pulse signal applied to an infrared light emitting element, and the light reception pulse signal output from an infrared light receiving element in the state which set the stainless steel pan as a cooking container. It is a graph which shows the relationship between the drive pulse signal applied to an infrared light emitting element, and the light reception pulse signal output from an infrared light receiving element in the state which set the copper pan as a cooking container.

An example of the temperature detection device according to the present invention will be described in detail.
FIG. 1 is a schematic configuration diagram showing an example of a cooking facility using an embodiment of a temperature detection device according to the present invention. A cooking facility 1 shown in FIG. 1 is a non-contact cooking container with a gas range mechanism 3 that heats a cooking container (a part corresponding to an object to be measured used in claims) 2 with fuel gas. 2, and the temperature of the cooking container 2 is measured by the temperature detection device 4 in a non-contact manner while the cooking container 2 is heated by the gas range mechanism 3. The gas range mechanism 3 is controlled so that the temperature of the cooking container 2 becomes a specified temperature and does not become too high.

  The gas range mechanism 3 includes a top plate 5 formed on the same plane, five virtues 7 placed on the top plate 5 so as to surround an opening 6 formed on the top plate 5, and a top plate 5. An annular gas burner 8 is arranged below the formed opening 6 at a distance from the top plate 5, a juice tray 9 attached to the central portion of the gas burner 8, and a gas pipe 10. A fuel supply intermittent valve 11 for intermittently supplying fuel gas, a fuel supply amount adjusting valve 12 for adjusting a passing amount of fuel gas discharged from the fuel supply intermittent valve 11, a signal supplied from the outside, and the like. A combustion control circuit 13 for controlling the intermittent valve 11, the fuel supply amount adjustment valve 12, etc., a gas nozzle 14 for taking in the fuel gas discharged from the fuel supply amount adjustment valve 12 and ejecting it vigorously, and a fuel ejected from the gas nozzle 14 Negative caused by gas And a mixing tube 15 for injecting combustion air from the surroundings to form an air-fuel mixture, and then ejecting the air from each flame port 16 formed on the inner peripheral side of the gas burner 8 to burn it. .

  When an operation panel (not shown) provided on the front surface of the gas range mechanism 3 or the like is operated and an ignition instruction, a thermal power designation instruction, or the like is input, the combustion control circuit 13 causes the fuel supply intermittent valve. 11 is opened, and the opening of the fuel supply amount adjustment valve 12 is adjusted to inject fuel gas from the gas nozzle 14, thereby supplying an optimal amount of air-fuel mixture from the mixing pipe 15 to the gas burner 8. The gas burner 8 is ejected from each flame port 16 and burned.

  Further, the temperature detection device 4 is arranged in an opening (not shown) formed in the center portion of the soup pan 9, and among the infrared rays radiated from the cooking container 2 placed on the virtues 7, The first optical filter 18 that transmits the wavelength component of one wavelength region “α1 (K1)” and the infrared light that is disposed below the first optical filter 18 and that has passed through the first optical filter 18 are received, and the infrared intensity. A first infrared light receiving element (part corresponding to the radiated light detecting means used in the claims) 19 that outputs a signal, and a dish placed on the virtues 7 disposed in the opening of the juice tray 9 A second optical filter 20 that transmits a wavelength component of the second wavelength region “α2 (K2)” of infrared rays radiated from the container 2, and a second optical filter disposed below the second optical filter 20. Receives infrared light transmitted through 20 A second infrared light receiving element (a part corresponding to the radiated light detecting means used in the claims) 21 that outputs an infrared intensity signal; an infrared intensity signal output from the first infrared light receiving element 19; Using the infrared intensity signal output from the infrared light receiving element 21, the temperature of the cooking container 2 is calculated, and a temperature detection signal (a signal indicating the temperature of the cooking container 2) is sent to the operation panel, the combustion control circuit 13, and the like. And a temperature calculation circuit (a portion corresponding to the temperature detection means used in the claims) 22 for performing a supply process and the like.

  Furthermore, the temperature detection device 4 is formed on the upper side of the side plate of the juice tray 9 and the light emission control circuit 23 that outputs a pulse voltage of “0.1 Hz” when the light emission instruction signal is output from the temperature calculation circuit 22. When the pulse voltage is output from the light emission control circuit 23 disposed in the opening 24, a wavelength different from the first wavelength region “α1 (K1)” and the second wavelength region “α2 (K2)” (for example, the wavelength “ H3 ″) infrared rays are generated and emitted to the lower surface of the cooking container 2 on the virtues 7. The infrared light emitting elements 25 (portions corresponding to the infrared irradiation means used in the claims) 25, Of the infrared rays emitted from the lower surface of the cooking container 2 placed on the gorge 7 and placed in the opening 26 formed in the upper part of the side surface, the infrared ray having the wavelength “H3” (radiated from the infrared light emitting element 25 and radix 7 Upper cooking container 2 under An infrared light receiving element (a portion corresponding to the infrared light receiving means used in the claims) 28 for selectively receiving the pulsed infrared light reflected by the surface and outputting a light reception pulse signal; A reflection detection circuit 29 is provided that voltage-discriminates the received light pulse signal output from the element 28 and supplies a cooking container detection signal to the temperature calculation circuit 22 or the like.

  Next, a single color, two-color switching condition, and a low emissivity pan detection method such as a stainless pan used in the temperature detection device of the present invention will be described.

  The inventor of the present application selected an object of various materials and measured the change in wavelength and the change in emissivity, and as a result, the emissivity / wavelength graph shown in FIG. 3 was obtained. Specifically, FIG. 3 shows the emissivity for each wavelength when various objects are heated and the temperature of the object is 200 ° C. The change in emissivity is almost constant for a black painted plate painted black on a metal surface, a silver painted plate coated with silver on a metal surface, a stainless steel plate, etc., which are “about 0.9” and “about 0.00 respectively. It becomes almost constant at 4 ”and“ about 0.2 ”. That is, such a black paint pan, a silver paint pan, etc. have the emissivity characteristic that the change of the emissivity with respect to the change of a wavelength is small.

  On the other hand, the wavelength of the organic silicon heat resistant paint cooking container in which the organic silicon heat resistant paint is applied to the metal surface and the cooking container in which the surface of the aluminum plate is anodized (hereinafter referred to as an anodized pan) is “8.0 μm”. When the wavelength is in the longer wavelength region, the emissivity is “about 0.9”, which is substantially constant, whereas when the wavelength is in the shorter wavelength region than “8.0 μm”, the emissivity is “about 0”. .4 "and" about 0.2 ". That is, such organic silicon heat-resistant paint cooking containers, anodized pans, and the like have emissivity characteristics that the change in emissivity with respect to the change in wavelength is large.

  Next, infrared spectrums radiated from cooking containers (pots) made of various materials will be described. First, in a black paint pan, a silver paint pan, and an alumite pan, when heated from room temperature (about 25 ° C.) to around “300 ° C.”, the infrared spectrum changes as shown in FIGS. .

  As shown in these figures, when a black paint pan, a silver paint pan, and an alumite pan are heated to raise the temperature, for example, when the temperature is raised from room temperature to around “300 ° C.”, “1.5 μm” The infrared rays are radiated in the wavelength region of “several tens of μm”, and within the range of “3.5 μm” to “15 μm”, the radiation intensity is detectable by various infrared sensors.

  In addition, as shown in FIG. 7, the spectrum of infrared rays emitted from a flame formed by a gas combustion burner has a wavelength range of “2.4 μm” to “3.1 μm” and “4.2 μm”. In the wavelength region of “8.0 μm”, the infrared intensity is high, so when measuring the intensity of the infrared ray emitted from the cooking container, a region where the intensity of the infrared ray emitted from such a flame is weak, for example, Using the first wavelength region “α1 (K1)” and the second wavelength region “α2 (K2)” shown in FIGS. 4 to 6, the intensity of infrared rays emitted from the cooking container is measured. In this way, when measuring the intensity of infrared rays emitted from the cooking container, the influence of the flame can be reduced, and the temperature measurement error can be minimized.

  Next, among the infrared rays radiated from the respective cooking containers, the intensity of infrared rays that have passed through the first wavelength region “α1 (K1)” and the intensity of infrared rays that have passed through the second wavelength region “α2 (K2)” The relationship will be described.

  First, in a blackbody furnace having a reference emissivity (approximately “1.0”), when the temperature of the blackbody furnace is changed, as shown by a line L1 in FIG. 8, the first wavelength region “α1” The infrared intensity on the (K1) "side changes, and the infrared intensity on the second wavelength region" α2 (K2) "side changes as shown by the line L2.

  In addition, when the black paint pan is changed to “100 ° C.”, “200 ° C.”, “300 ° C.”, as shown by the white dots in FIG. The infrared intensity on the α1 (K1) ″ side changes, and as indicated by the black dots, the infrared intensity on the second wavelength region “α2 (K2)” side emitted from the black paint pan changes. That is, according to the ratio of the emissivity of the blackbody furnace (approximately “1.0”) and the emissivity of the black paint pan (approximately “0.9”), the line L1 (FIG. 9) illustrated in FIG. The first wavelength region “α1” (same as the line L1 described in FIG. 8), which is moved downward by “0.9” times (not shown) is emitted from the black paint pan. K1) “Infrared intensity on the side” and the line L2 shown in FIG. 9 (the same as the line L2 shown in FIG. 8) is moved downward by “0.9” times. The line (not shown) becomes the infrared intensity on the second wavelength region “α2 (K2)” side emitted from the black paint pan.

  Then, using the line L1 and line L2 shown in FIG. 8, the infrared intensity on the first wavelength region “α1 (K1)” side emitted from the black paint pan and the second wavelength region “α2 (K2)” side Is converted into the temperature in a blackbody furnace.

  Further, when the silver paint pan is changed to “100 ° C.”, “200 ° C.”, and “300 ° C.”, as shown by the white dots in FIG. 10, the first wavelength region radiated from the silver paint pan “ The infrared intensity on the α1 (K1) ″ side changes, and the infrared intensity on the second wavelength region “α2 (K2)” side emitted from the silver paint pan changes as indicated by the black dots. That is, according to the ratio between the emissivity of the black body pan (approximately “1.0”) and the emissivity of the silver paint pan (approximately “0.4”), the line L1 illustrated in FIG. The first wavelength region “α1” in which a line (not shown) that is moved downward by about “0.4” times is the same as the line L1 described in FIG. (K1) “Infrared intensity on the side” and move the line L2 shown in FIG. 10 (the same as the line L2 shown in FIG. 8) downward by about “0.4” times. The line (not shown) is the infrared intensity on the second wavelength region “α2 (K2)” side emitted from the silver paint pan.

  Then, using the lines L1 and L2 shown in FIG. 8, the infrared intensity on the first wavelength region “α1 (K1)” side emitted from the silver paint pan and the second wavelength region “α2 (K2)” side Is converted into the temperature in a blackbody furnace.

  Further, when the alumite pan is changed to “100 ° C.”, “200 ° C.”, “300 ° C.”, as shown by the white dots in FIG. 11, the first wavelength region “α1” radiated from the alumite pan ( K1) The infrared intensity on the “side” changes, and the infrared intensity on the second wavelength region “α2 (K2)” side radiated from the alumite pan changes as indicated by each black dot. That is, the emissivity of the black body pan (approximately “1.0”) and the emissivity of the anodized pan (approximately “0.4” on the first wavelength region “α1 (K1)” side, and the second wavelength region “α2 ( K2) The line L1 shown in FIG. 11 (same as the line L1 shown in FIG. 8) is multiplied by “0.4” according to the ratio of “0.9” on the “side”. However, the line moved downward (not shown) becomes the infrared intensity of the first wavelength region “α1 (K1)” radiated from the alumite pan, and the line L2 ( The second wavelength region “α2” (same as the line L2 described in FIG. 8), which is moved downward by “0.9” times (not shown) is emitted from the anodized pan. K2) “Infrared intensity on the side”.

  Then, using the lines L1 and L2 shown in FIG. 8, the infrared intensity on the first wavelength region “α1 (K1)” side radiated from the alumite pan and the second wavelength region “α2 (K2)” side The infrared intensity is converted into the temperature in the blackbody furnace.

  From the result of the above temperature conversion value, any of “100 ° C.”, “200 ° C.”, and “300 ° C.” is obtained in the case of the black paint pan shown in FIG. 9 and the silver paint pan shown in FIG. The temperature T1 (100), the temperature T1 (200), and the temperature T1 (300) corresponding to the infrared intensity on the first wavelength region “α1 (K1)” side radiated from the cooking container are also cooking containers. The relational expression that the temperature T2 (100), the temperature T2 (200), and the temperature T2 (300) corresponding to the infrared intensity on the second wavelength region “α2 (K2)” side radiated from is higher is established.

  On the other hand, in the case of the alumite pan shown in FIG. 11, the first wavelength region “α1 (K1)” radiated from the cooking container at any of “100 ° C.”, 200 ° C., and 300 ° C. The temperature T1 (100), the temperature T1 (200), and the temperature T1 (300) corresponding to the infrared intensity are the temperatures T2 corresponding to the infrared intensity on the second wavelength region “α2 (K2)” side emitted from the cooking container. (100), temperature T2 (200), and temperature T2 (300).

  If such characteristics are used, the temperature T2 (100), the temperature T2 (200), and the temperature T2 (300) corresponding to the infrared intensity of the second wavelength region “α2 (K2)” radiated from the cooking container. Therefore, when the temperature T1 (100), temperature T1 (200), and temperature T1 (300) corresponding to the infrared intensity on the first wavelength region “α1 (K1)” side radiated from the cooking container are high, the black paint pan It can be determined that it is a cooking container such as a silver paint pan, and when it is low, it can be determined that it is a cooking container such as an alumite pan.

  Further, the infrared intensity “B” on the second wavelength region “α2 (K2)” side emitted from the cooking container, and the infrared intensity “on the first wavelength region“ α1 (K1) ”side emitted from the cooking vessel“ The relationship between the infrared intensity ratio “B / A” and temperature with respect to A ”is the infrared intensity ratio / temperature graph shown in FIG.

  As can be seen from this infrared intensity ratio / temperature graph, the black paint pan and the silver paint pan are almost the same even if the temperature changes within the temperature range from room temperature (25 ° C.) to around “300 ° C.”. The infrared intensity ratio “B / A” changes along the line, and both have almost the same characteristics. That is, if the infrared intensity ratio “B / A” is the same, the temperature of the cooking container with respect to the infrared intensity ratio “B / A” is substantially the same.

  Therefore, for the black paint pan and the silver paint pan, a typical infrared intensity ratio / temperature line indicating the relationship between the infrared intensity ratio “B / A” and the temperature of the cooking container is stored in advance and used for cooking. When the container is heated, the infrared intensity “B” on the second wavelength range “α2 (K2)” emitted from the cooking container and the first wavelength range “α1 (K1) emitted from the cooking container While measuring the infrared intensity “A” on the “side”, the infrared intensity ratio “B / A” is obtained, and based on the infrared intensity ratio “B / A” and the previously stored infrared intensity ratio / temperature line. The temperature of the cooking container can be determined.

  In contrast, an organosilicon paint pan with an organosilicon paint applied to the surface of a metal and an anodized pan with an anodized surface are significantly different from the infrared intensity ratio “B / A” of a black paint pan and a silver paint pan. For this reason, the temperature of the cooking container cannot be accurately detected using the infrared intensity ratio “B / A”.

  For organosilicon paint pans with an organosilicon paint on the metal surface and anodized pans with alumite treatment on the surface, the organic silicon paint pan has a wavelength in the range of “8.0 μm” or more as shown in FIG. Then, since the emissivity is from “0.80” to “0.98”, using a cooking container having an emissivity that is an average value of “0.89” or close to this, When the cooking container is heated, the temperature of the cooking container and the infrared intensity “B” of the second wavelength region “α2 (K2)” emitted from the cooking container are measured, and the measurement result is obtained. I remembered it.

  When judging the temperature of an organosilicon paint pan in which an organosilicon paint is applied to the surface of a metal, and the temperature of an anodized pan with an anodized surface, the second wavelength region “α2” radiated from these organosilicon paint pan and anodized pan (K2) The infrared intensity “B” on the “side” was measured, and the infrared silicon intensity “B” and the stored data were used to determine the temperature of the organosilicon coating pot and the anodized pot. .

  In addition, when the cooking container is a stainless steel pan, the emissivity is almost constant over the entire wavelength region as shown in FIG. When determining whether it is a black paint pan or a silver paint pan, the temperature T2 (100) and the temperature T2 (200 corresponding to the infrared intensity of the second wavelength region “α2 (K2)” emitted from the cooking container ), Temperature T1 (100), temperature T1 (200), temperature T1 (300) corresponding to the infrared intensity of the first wavelength region “α1 (K1)” radiated from the cooking container from temperature T2 (300) Becomes higher.

  Accordingly, when the cooking container is a stainless steel pan, the infrared intensity “B” on the second wavelength region “α2 (K2)” side radiated from the cooking container is the same as in the black paint pan, the silver paint pan, and the like. And measuring the infrared intensity “A” on the first wavelength region “α1 (K1)” side radiated from the cooking container, the infrared intensity ratio “B / A” is obtained, and this infrared intensity ratio “B / Based on A ″ and the pre-stored infrared intensity ratio / temperature line, the temperature of the cooking container can be determined.

  However, in the case of a stainless steel pan, the emissivity is as low as about “0.2” as shown in FIG. 3, so that when the temperature of the cooking container is about “100 ° C.”, it is emitted from the cooking container. Both the infrared intensity “A” on the first wavelength region “α1 (K1)” side and the infrared intensity “B” on the second wavelength region “α2 (K2)” side are both small values, and the infrared intensity ratio Using “B / A”, the temperature of the cooking container cannot be accurately detected.

  Therefore, an infrared light emitting element that emits infrared light having a wavelength not included in the first wavelength region “α1 (K1)” and the second wavelength region “α2 (K2)”, and the first wavelength region “α1 (K1)”, An infrared light receiving element for receiving infrared light having a wavelength not included in the two-wavelength region “α2 (K2)” is prepared, and is spaced apart by “4.5 cm” from the cooking container by a vertical distance, and the bottom center of the cooking container In contrast, the infrared light emitting element is disposed at an angle of “45 °”, and is further separated by “4.5 cm” from the cooking container by a vertical distance, and at an angle of “45 °” with respect to the bottom center of the cooking container. , Produced an infrared detector.

  Then, the light emission control circuit causes the infrared light emitting element to emit light in a pulse and emits the light to the center of the bottom of the cooking container, and the infrared light receiving element receives the infrared light reflected at the center of the bottom of the cooking container, and the reflection detection circuit An experiment was conducted to determine the size.

  As a result, when no cooking container is placed on Gotoku, a pulse voltage of “15 V” having a frequency of “0.1 Hz” is output from the light emission control circuit as shown in FIG. It was found that when pulsed infrared light was emitted from the device, the output of the infrared light receiving device was substantially “0 mV”.

  In addition, when a cooking container is placed on Gotoku, and this is a black paint pan, anodized pan, stainless steel pan, or copper pan, it is about 5 mV from the infrared light receiving element as shown in FIGS. A light reception pulse signal having a voltage value, a light reception pulse signal having a voltage value of about “40 mV”, a light reception pulse signal having a voltage value of about “80 mV”, and a light reception pulse signal having a voltage value of about “130 mV” are output. I understood that.

  From these experiments, a first threshold value “SH1” having a voltage value of about “2.5 mV” and a second threshold value having a voltage value “SH2” of about “50 mV” are found in the reflection detection circuit. When the pulse voltage is output from the infrared light emitting element and the voltage value “Vout” of the light receiving pulse signal output from the infrared light receiving element is “Vout <SH1”, the cooking container is It was determined that it was not placed, and when “SH2 <Vout”, it was determined that a cooking container having a low emissivity such as a stainless steel pan or a copper pan was mounted on Gotoku.

  In the present invention, the temperature of the cooking container having an emissivity of “0.2” or close to this, and the infrared intensity “2” in the second wavelength region “α2 (K2)” radiated from the cooking container “ The data obtained by measuring “B” is stored, and when determining the temperature of the stainless steel pan and copper pan, the second wavelength region “α2 (K2)” side radiated from the stainless pan and copper pan is measured. Infrared intensity “B” was measured, and using this infrared intensity “B” and the stored data, the temperature of the organic silicon-based paint pan and anodized pan was calculated.

  As a result, the infrared of the second wavelength region “α2 (K2)” radiated from the cooking container from when the temperature of the stainless steel pan, copper pan, etc. is around “100 ° C.” to around “300 ° C.”. It was confirmed that the difference between the temperature obtained by using the strength and the actual temperature was extremely small.

  Next, temperature processing in the cooking container will be specifically described with the temperature detection device 4 in the present configuration.

  When an operation panel (not shown) or the like provided on the front surface of the gas range mechanism 3 or the like is operated and an ignition instruction, a fire power designation instruction, or the like is input, the following operation is performed.

  First, an operation panel (not shown) or the like provided on the front surface of the gas range mechanism 3 is operated to input an ignition instruction or the like as shown in the flowchart of FIG. When the light is output, a pulse voltage is output from the light emission control circuit 23, infrared light is emitted from the infrared light emitting element 25 (step ST1), and whether infrared light is received by the infrared light receiving element 28 by the reflection detection circuit 29 or not. Is checked.

  Here, infrared light is not received by the infrared light receiving element 28, and the first threshold having the voltage value “Vout” of the light reception pulse signal output from the infrared light receiving element 28 and a voltage value of about “2.5 mV”. The value “SH1” is compared, and if “Vout <SH1” (step ST2), it is determined by the reflection detection circuit 29 that the cooking container 2 is not placed on the virtues 7 and provided on the operation panel or the like. A voice message such as “Please place a cooking container” is issued from the warning mechanism (step ST3).

  If the infrared light receiving element 28 receives infrared light, and the voltage value “Vout” of the light reception pulse signal output from the infrared light receiving element 28 is higher than the first threshold value “SH1” (step ST2), the reflection detection circuit 29. Thus, it is determined that the cooking container 2 is placed on the virtues 7, and a cooking container detection signal is generated.

  When the cooking container detection signal is output from the reflection detection circuit 29, the temperature calculation circuit 22 refers to the infrared intensity / temperature table for the black body furnace, and the infrared light output from the first infrared light receiving element 19. A temperature T1 corresponding to the value of the intensity signal (infrared intensity “A”) is calculated, and a temperature T2 corresponding to the value of the infrared intensity signal (infrared intensity “B”) output from the second infrared light receiving element 21 is calculated. Calculation is performed (step ST4).

  Thereafter, when the temperature of the cooking container 2 to be heated rises by the gas range mechanism 3 and the temperatures T1 and T2 become equal to or higher than the preset temperatures, the temperature calculation circuit 22 causes the temperature T1 to be higher than the temperature T2. If it is checked whether it is large and “T1 <T2” (step ST5), the cooking container 2 placed on Gotoku 7 is a pan belonging to a non-gray body such as an organic silicon-based paint pan or an alumite pan. It is determined that there is.

  Then, the infrared intensity / temperature table for the emissivity “0.9” is referred to by the temperature calculation circuit 22, and the value of the infrared intensity signal (infrared intensity “B”) output from the second infrared light receiving element 21 is obtained. The corresponding temperature is calculated (step ST6), and this is displayed on the operation panel and the like, and is supplied to the fuel control circuit 13 so that the specified temperature or pattern temperature is obtained. The opening degree is adjusted (step ST7).

  Further, in the comparison operation between the temperature T1 and the temperature T2 described above, if “T1 ≧ T2” (step ST5), the temperature calculation circuit 22 causes the cooking container 2 placed on Gotoku 7 to be a black paint pan, It is determined that the pot belongs to a gray body such as a silver paint pot, or a pot belonging to a low emissivity system such as a stainless steel pot, and a light emission instruction signal is output to the light emission control circuit 23.

  As a result, a pulse voltage is output from the light emission control circuit 23, a pulsed infrared ray is emitted from the infrared light emitting element 25, and a light reception pulse signal output from the infrared light receiving element 20 is captured by the reflection detection circuit 29. (Step ST8).

  Thereafter, the reflection detection circuit 29 compares the voltage value “Vout” of the received light pulse signal with the second threshold value “SH2” having a voltage value “SH2” of about “50 mV”, and “Vout ≦ SH2”. If so (step ST9), a gray body detection signal is generated and supplied to the temperature calculation circuit 22.

  Thus, the temperature calculation circuit 22 determines that the cooking container 2 placed on the Gotoku 7 is a pan belonging to a gray body such as a black paint pan or a silver paint pan, and outputs from the second infrared light receiving element 21. Infrared intensity ratio “B / A” indicating the ratio of the value of the infrared intensity signal (infrared intensity “B”) to be output and the value of the infrared intensity signal output from the first infrared light receiving element 19 (infrared intensity “A”) "Is calculated, the infrared intensity ratio / temperature table for the black paint pan is referred to, the temperature corresponding to the infrared intensity ratio" B / A "is calculated (step ST10), and this is displayed on the operation panel or the like. At the same time, the opening degree of the fuel supply amount adjustment valve 12 is adjusted so as to be supplied to the fuel control circuit 13 and reach the designated temperature or pattern temperature (step ST11).

  Further, when the voltage value “Vout” of the received light pulse signal is checked, if “Vout> SH2” (step ST9), the reflection detection circuit 29 generates a stainless pan detection signal to calculate the temperature. It is supplied to the circuit 22.

  Thereby, it is determined by the temperature calculation circuit 22 that the cooking container 2 placed on Gotoku 7 is a pan belonging to a low emissivity system such as a stainless pan, and the infrared intensity for emissivity “0.2” is determined. The temperature corresponding to the value of the infrared intensity signal (infrared intensity “B”) output from the second infrared light receiving element 21 is calculated by referring to the temperature table (step ST12), and this is displayed on the operation panel or the like. At the same time, the degree of opening of the fuel supply amount adjustment valve 12 is adjusted so as to be supplied to the fuel control circuit 13 and reach the designated temperature or pattern temperature (step ST13).

  Thus, in this embodiment, the infrared intensity / temperature table for the black pan, the value of the infrared intensity signal output from the first infrared light receiving element 19 (infrared intensity “A”), and the output from the second infrared light receiving element 21 The temperature T1, the temperature T2 obtained by using the value of the infrared intensity signal (infrared intensity “B”), the voltage value “Vout” of the received light pulse signal output from the infrared light receiving element 28 and the second threshold “ Based on the results of comparison with SH2 ″, the cooking container 2 placed on Gotoku 7 is a non-gray body pan such as an organic silicon paint pan or anodized pan, a black paint pan, or a gray body such as a silver paint pan. It is determined whether it is a pan belonging to or a pan belonging to a low emissivity system such as a stainless steel pan.

  Further, when it is determined that the pan belongs to the non-gray body, the infrared intensity / temperature table for emissivity “0.9”, the value of the infrared intensity signal output from the second infrared light receiving element 21 (infrared intensity “B” ") Is used to calculate the temperature of the cooking container 2 and when it is determined to be a pan belonging to a gray body such as a black paint pan or a silver paint pan, it is output from the second infrared light receiving element 21. An infrared intensity ratio “B / A” indicating a ratio between the value of the infrared intensity signal (infrared intensity “B”) and the value of the infrared intensity signal output from the first infrared light receiving element 19 (infrared intensity “A”); Using the infrared intensity ratio / temperature table for the black paint pan, the temperature of the cooking container 2 is calculated, and when it is determined that the pan belongs to a low emissivity system such as a stainless steel pan, the emissivity “0” .2 "infrared intensity / temperature table, 2nd red Using the value of the infrared intensity signals output from the line light receiving element 21 (infrared intensity "B"), and calculates the temperature of the cooking container 2.

  Thereby, in this form, the cooking container 2 is a pan belonging to a gray body such as a non-gray body such as an organic silicon-based paint pan or an anodized pan, a black paint pan or a silver paint pan, or a stainless steel pan. In addition, even in a pan made of a material having a low emissivity, the temperature of the cooking container 2 can be measured with high accuracy from a low temperature of about “100 ° C.” to a high temperature (effect of claim 1).

  Further, in this embodiment, the first wavelength region (wavelength region “3.1 μm” to “4.2 μm”) in which the infrared intensity change with respect to the temperature change of the cooking container 2 is large among the infrared rays radiated from the cooking container 2. ) And the infrared component in the second wavelength region (wavelength region “8.0 μm” to “20.0 μm”) in which the change in the infrared intensity with respect to the temperature change of the cooking container 2 is small are extracted to obtain the first temperature. Since T1 and the second temperature T2 are calculated, the difference between the first temperature and the second temperature required to determine whether the cooking container 2 belongs to a non-gray body is increased. Accordingly, the material determination accuracy can be increased, and the accuracy when calculating the temperature of the cooking container 2 can be greatly improved (effects of claims 2 and 3).

  Further, in this embodiment, when it is determined that the cooking container 2 belongs to a non-gray body, an infrared intensity / temperature table for emissivity “0.9” is used, and the cooking container 2 is made of stainless steel. When it is determined to belong to a low emissivity system such as a pan, the infrared intensity / temperature table for emissivity “0.2” is used to calculate the temperature of the cooking container 2. Therefore, even if the cooking container 2 belongs to a non-gray body such as an alumite pot, or belongs to a low emissivity system such as a stainless steel pot, the temperature of the cooking container 2 is accurately calculated. (Effects of claims 4 and 5).

  Further, in this embodiment, when an operation panel or the like provided on the front surface of the gas range mechanism 3 is operated and an ignition instruction or the like is input, a pulse voltage is output from the light emission control circuit 23, and the infrared light emitting element 25. When the infrared light receiving element 28 is not receiving the pulsed infrared light in the state where the infrared light is emitted from, the reflection detection circuit 29 determines that the cooking container 2 is not placed on the virtues 7. Therefore, when there is no cooking container 2 for temperature measurement on Gotoku 7, etc., when an ignition instruction or the like is input, this is detected and an alarm is given to inform the cook etc. In addition, it is possible to prevent erroneous calculation when calculating the temperature of the cooking container 2 (effect of claim 6).

  Moreover, in this form, since the infrared rays radiated from the cooking container 2 are received and the temperature of the cooking container 2 is calculated, as a temperature measurement object, a pan heated by heat from the outside, Any temperature can be accurately measured in a non-contact manner as long as it generates infrared rays, such as a cooking container such as a frying pan or a heated object such as food on the cooking utensil (claim) Effect of item 7).

  In the above-described embodiment of the present invention, the gas range mechanism 3 having the gas burner 8 formed in an annular shape is used. However, other types of gas burners, for example, a gas range mechanism having a cylindrical gas burner are used. You may make it do.

  By making the cooking facility using such a gas range mechanism perform the same operation as described above, the cooking container 2 is a pan belonging to a non-gray body such as an organic silicon-based paint pan or an alumite pan, or a black paint pan. The temperature of the cooking container from a low temperature of about "100 ° C" to a high temperature, even if it is a pan with a low emissivity, such as a pan that belongs to a gray body such as a silver paint pan, or a stainless steel pan Can be measured with high accuracy.

  The present invention relates to a temperature detection device and a temperature detection method for detecting the temperature of an object to be measured in a non-contact state. The present invention relates to a temperature detection device that detects the temperature of an object to be heated such as a cooked food in a non-contact manner, and has industrial applicability.

1: Cooking equipment 2: Cooking container 3: Gas range mechanism 4: Temperature detection device 5: Top plate 6: Opening part 7: Gotoku 8: Gas burner 9: Juice tray 10: Gas pipe 11: Fuel supply intermittent valve 12: Fuel Supply amount control valve 13: Combustion control circuit 14: Gas nozzle 15: Mixing pipe 16: Flame port 17: Opening portion 18: First optical filter 19: First infrared light receiving element 20: Second optical filter 21: Second infrared light receiving element 22: Temperature calculation circuit 23: Light emission control circuit 25: Infrared light emitting element 26: Opening 28: Infrared light receiving element 29: Reflection detection circuit

Claims (7)

A temperature detection device for detecting the temperature of an object to be measured in a non-contact state,
Radiated light detecting means for detecting the infrared intensity of two different wavelength regions in the infrared region radiated according to the surface temperature from the object to be measured;
Infrared irradiating means for irradiating the object to be measured with infrared rays in a predetermined wavelength region;
Infrared light receiving means arranged to receive reflected light from the object to be measured irradiated from the infrared irradiation means;
Temperature detecting means for detecting the temperature of the object to be measured based on the output of the emitted light detecting means and the output of the infrared light receiving means, and
The temperature detecting means includes
A first temperature is calculated based on the infrared intensity of the first wavelength region in the two wavelength regions emitted from the device under test, and the first temperature in the two wavelength regions emitted from the device under test is calculated. Calculating the second temperature based on the infrared intensity of the second wavelength region longer than the wavelength region;
(A) When the second temperature is higher than the first temperature, the object to be measured is regarded as a non-gray body, and the object to be measured is based on the infrared intensity of the second wavelength region of the non-gray body. Calculate the temperature of
(B) When the second temperature is equal to or lower than the first temperature and the output value of the infrared light receiving means when the infrared irradiation means is turned on is equal to or smaller than a preset threshold value, the measurement target The object is regarded as a gray body, and the temperature of the object to be measured is calculated based on an infrared intensity ratio between the first wavelength region and the second wavelength region of the gray body,
(C) When the output value of the infrared light receiving means when the infrared irradiation means is turned on is larger than the threshold value, the object to be measured is regarded as a low emissivity body, and the second wavelength region of the low emissivity body is determined. Calculate the temperature of the object to be measured based on the infrared intensity,
A temperature detecting device characterized by that. The synchrotron radiation detection means is set to the large fluctuation range corresponding to a small fluctuation range where the change in emissivity is small with respect to a change in wavelength of the object to be measured or a large fluctuation range where the change in emissivity is large with respect to a change in wavelength Configured to detect each of the infrared intensity for the first wavelength region and the infrared intensity for the second wavelength region set in the small variation range,
The calculation of the first temperature in the temperature detecting means is performed from the object to be measured and a correlation characteristic indicating a change in infrared intensity in the first wavelength region with respect to a temperature change of a reference body whose emissivity is previously known. Based on the infrared intensity for the first wavelength region, the temperature of the reference body corresponding to the same infrared intensity as the infrared intensity emitted from the object to be measured is the first temperature,
In the calculation of the second temperature in the temperature detecting means, the temperature detecting means is radiated from the object to be measured and a correlation characteristic indicating a change in infrared intensity in the second wavelength region with respect to a temperature change of the reference body. The temperature of the reference body corresponding to the same infrared intensity as the infrared intensity emitted from the object to be measured is set as the second temperature based on the infrared intensity of the second wavelength region. Item 2. The temperature detection device according to Item 1. The first wavelength region is selected from a range of 3.1 to 4.2 μm,
The second wavelength region is selected from a range of 8.0 to 20.0 μm.
The temperature detection apparatus according to claim 1 or 2, wherein   The temperature of the object to be measured is calculated in the range of emissivity of 0.8 to 0.95 when the object to be measured is regarded as a non-gray body. The temperature detection device according to any of the above items.   When the object to be measured is regarded as a low emissivity body, the temperature of the object to be measured is calculated in a range where the emissivity is less than 0.3. The temperature detection apparatus described in 1.   The warning signal that the object to be measured does not exist at the temperature measurement position is output when the output value of the infrared light receiving means is smaller than a predetermined value when the infrared irradiation means is turned on. 6. The temperature detection device according to any one of items 5.   The object to be measured is a cooking object such as a pan, a frying pan or the like or food on the cooking utensil that is heated by being supplied with electric or magnetic energy or combustion energy such as gas from the outside. The temperature detection device according to claim 1, wherein the temperature detection device is a device.

Images