WO2015146600A1 - 凍結対象物の内部温度測定方法及び凍結対象物の内部温度測定装置 - Google Patents
凍結対象物の内部温度測定方法及び凍結対象物の内部温度測定装置 Download PDFInfo
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- WO2015146600A1 WO2015146600A1 PCT/JP2015/057234 JP2015057234W WO2015146600A1 WO 2015146600 A1 WO2015146600 A1 WO 2015146600A1 JP 2015057234 W JP2015057234 W JP 2015057234W WO 2015146600 A1 WO2015146600 A1 WO 2015146600A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/006—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of the effect of a material on microwaves or longer electromagnetic waves, e.g. measuring temperature via microwaves emitted by the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
Definitions
- the present disclosure relates to a method for measuring the internal temperature of a frozen object and a device for measuring the internal temperature of the frozen object that measure the internal temperature of the frozen object such as frozen frozen food.
- Non-Patent Documents 1 and 2 When using an infrared sensor, the surface temperature of the frozen object can be measured, but the internal temperature of the frozen object cannot be measured. Moreover, when packaging materials, such as a wrap, exist, the surface temperature of food cannot be measured accurately. In addition, those using the change in capacitance described in Non-Patent Documents 1 and 2 not only use a special measurement device, but also have detailed measurement conditions, and subject the object to be frozen to an accurate condition. In the freezing process of food, 100% inspection of food temperature is not suitable.
- the thing using the electromagnetic wave of patent document 1 irradiates the electromagnetic wave of the predetermined frequency radiated
- the wireless tag receives the transmitted electromagnetic wave, the wireless tag transmits a response signal to the communication means.
- How much electromagnetic waves are absorbed and transmitted by moisture varies greatly depending on whether the moisture is liquid phase water or solid phase ice or gas phase water vapor, and the communication means is connected to the wireless tag accordingly. Whether communication is possible or not changes abruptly. For this reason, it is possible to determine whether or not moisture has undergone phase transition based on whether the communication unit can communicate with the wireless tag.
- At least some embodiments of the present invention measure the internal temperature of a frozen object that can measure the internal temperature of the frozen object such as frozen frozen food using a microwave resonator. It is an object of the present invention to provide a method and a device for measuring the internal temperature of a frozen object.
- a method for measuring the internal temperature of a frozen object includes: A method for measuring the internal temperature of a frozen object, An arrangement step of arranging the object to be frozen in a microwave resonant magnetic field generated using a microwave resonator; A state detection step of detecting a resonance state of the frozen object in a frozen state using the microwave resonator, and detecting an internal temperature of the frozen object using a temperature measuring device, A calibration curve calculating step for calculating a calibration curve by performing a regression analysis using the resonance state detected in the state detection step as an explanatory variable, and using the internal temperature of the frozen object detected by the temperature measuring device as a target variable; Applying the resonance state detected in the detection step to the calibration curve calculated in the calibration curve calculation step, a temperature calculation step of calculating the internal temperature of the frozen object in the frozen state; It is comprised so that it may comprise.
- the inventor of the present application greatly changes the absorption and transmission of the microwave to the frozen object depending on whether the water of the frozen object is liquid phase water or solid phase ice. Based on the characteristics that the resonance frequency and resonance peak voltage of the resonator change, we found that there is a correlation between the resonance peak voltage and the internal temperature of the object to be frozen. From this discovery, the inventor of the present application determines the internal temperature of the frozen object corresponding to the detected resonance peak voltage by preliminarily determining the correlation between the resonance peak voltage and the internal temperature of the frozen object.
- the inventors of the present application when predicting the internal temperature of the object to be frozen, are calculated by performing regression analysis using the resonance state of the object to be frozen as an explanatory variable and the internal temperature of the object to be frozen as an objective variable. It was found that the internal temperature of the frozen object can be predicted from the calibration curve. Thus, by applying the resonance state detected in the state detection step to the calibration curve, the internal temperature of the frozen object in the frozen state can be calculated. Therefore, the internal temperature measurement method of the frozen object which can measure the internal temperature of the frozen object such as frozen food can be realized using the microwave resonator.
- the projected area of the microwave resonator is set to be smaller than the projected area of the object to be frozen so that the resonance magnetic field region of the microwave generated by the microwave resonator covers the entire area of the object to be frozen. Configured.
- the projected area of the microwave resonator is smaller than the projected area of the object to be frozen, microwaves detected by the microwave generated by the microwave resonator without passing through the object to be frozen can be eliminated. . For this reason, the resonance state of the frozen object can be reliably detected.
- the object to be frozen is a solid food packed with contents
- the resonance state detected in the state detection step is a resonance peak voltage of the frozen object in a frozen state
- the temperature calculating step applies the resonance peak voltage detected in the state detecting step to the calibration curve calculated in the calibration curve calculating step to predict an internal temperature of the frozen object in a frozen state. Configured as follows.
- the state detection step further includes a resonance frequency detection step of detecting a resonance frequency of the frozen object using the microwave resonator,
- the calibration curve calculating step applies the resonance frequency detected in the resonance frequency detection step to a second calibration curve that defines the correlation between the internal temperature of the object to be frozen and the resonance frequency.
- a frozen state determining step for determining whether or not the object is in a frozen state, In the temperature calculating step, the detected value of the resonance peak voltage when the frozen object is determined to be in the frozen state in the frozen state determining step is used as a correlation between the internal temperature of the frozen object and the resonance peak voltage. Is applied to a first calibration curve that defines the internal temperature of the object to be frozen.
- the inventor of the present application greatly changes the absorption and transmission of the microwave to the frozen object depending on whether the water of the frozen object is liquid phase water or solid phase ice. Based on the characteristics that the resonance frequency and resonance peak voltage of the resonator change, we found that there is a correlation between the resonance frequency and the internal temperature of the object to be frozen when moisture is in the phase transition state. This correlation has such a relationship that the internal temperature of the object to be frozen is constant until a certain resonance frequency, and the internal temperature is lowered for a while when the resonance frequency is higher than a certain resonance frequency.
- the inventor of the present application has found that, based on the correlation between the resonance frequency and the internal temperature of the object to be frozen, the object to be frozen is in a frozen state when the internal temperature exceeds the resonance frequency that starts to decrease for a while. . Therefore, in the temperature calculation step of the invention according to claim 4, the detected value of the resonance peak voltage when the frozen object is determined to be in the frozen state in the frozen state determining step is applied to the first calibration curve, Since the internal temperature of the frozen object is calculated, the calculated internal temperature is for the frozen object in the frozen state, and the internal temperature of the frozen object in the frozen state can be accurately calculated.
- the frozen object is a frozen food conveyed by a conveyance line
- the resonance peak voltage is detected using the microwave resonator for the frozen food being conveyed by the conveyance line
- the temperature calculation step an internal temperature of the frozen food being transported by the transport line is calculated.
- the object to be frozen is frozen food transported by the transport line
- the resonance peak voltage is detected using a microwave resonator for the frozen food being transported by the transport line
- the temperature calculation step the internal temperature of the frozen food being transported by the transport line is calculated, so that it is possible to inspect all the food temperatures of the frozen food transported by the transport line in the frozen food freezing step. Therefore, the management accuracy of the internal temperature in the freezing process of frozen food can be further increased.
- the resonance peak voltage of the frozen food in an unwrapped state or a state packaged by a member that transmits microwaves is detected.
- the resonance peak voltage of the frozen food in the unwrapped state or the state packaged by the member that transmits microwaves is detected, so that the resonance peak voltage of the packaged frozen food can be detected.
- the resonance peak voltage of the frozen food in an unwrapped state before being packaged can be detected. For this reason, the resonance peak voltage of frozen food can be detected during the freezing process of frozen food.
- the thickness of the frozen object in the microwave irradiation direction is configured to be 50 mm or less.
- the object to be frozen begins to freeze from the outside, so that the inside of the object to be frozen is difficult to freeze. For this reason, if the internal temperature of the frozen object can be measured, the frozen state of the frozen object can be predicted. For this reason, when the distance that the microwave can reach the center of the frozen object to be frozen is 25 mm, the thickness of the frozen object in the microwave irradiation direction is preferably 50 mm or less. Therefore, in the invention described in claim 7, since the thickness of the object to be frozen in the microwave irradiation direction is 50 mm or less, the microwave can be incident on the center of the object to be frozen, The internal temperature can be measured reliably.
- the object to be frozen is thawed from the outside of the object to be frozen and the inside is thawed last, so when water is generated on the outside after thawing, the microwave is absorbed by the water and inside the object to be frozen. Not reach. For this reason, the internal temperature measurement method of the present application cannot be applied in the thawing step of the object to be frozen.
- the frozen object is a plurality of frozen frozen foods formed into small granules
- a filling step of filling a plurality of the above frozen frozen foods into a container
- the resonance state detected in the state detection step is a resonance peak voltage and a resonance frequency of the frozen object in the frozen state
- the temperature calculating step applies the resonance peak voltage and the resonance frequency detected in the state detecting step to the calibration curve calculated in the calibration curve calculating step, so that the internal temperature of the frozen frozen food in the frozen state
- the container filled with the plurality of frozen frozen foods when a value indicating a degree of correlation between the predicted internal temperature of the frozen frozen foods and the actually measured internal temperature of the frozen frozen foods is smaller than a predetermined value. And refilling the plurality of frozen frozen foods to increase the density.
- the object to be frozen is a plurality of frozen frozen foods formed into small granules. Therefore, when the gap between the frozen frozen foods is larger than that of the solid food, the microwave passing through the gap is microwave resonators. , The frozen state of the object to be frozen may not be detected. Therefore, the inventor of the present application selects a plurality of frozen frozen foods when the value indicating the degree of correlation between the predicted internal temperature of the frozen frozen food and the measured internal temperature of the frozen frozen food is smaller than a predetermined value. A refilling step for refilling the filled containers with the plurality of frozen frozen foods to increase the density was further provided. For this reason, there is no gap between frozen frozen foods, and it is possible to detect the frozen state of a plurality of frozen frozen foods. Therefore, the internal temperature measurement method of the frozen object which can measure the internal temperature of the frozen food using the microwave resonator can be realized.
- the internal temperature measurement device of the frozen object according to some embodiments of the present invention, An internal temperature measuring device for a frozen object, A microwave resonator for detecting a resonance state of the frozen object in a frozen state; The resonance detected by the microwave resonator in the calibration curve calculated by performing regression analysis with the resonance state of the frozen object in the frozen state as an explanatory variable and the internal temperature of the frozen object as the objective variable A temperature calculation unit configured to calculate an internal temperature of the frozen object in a frozen state by applying a state; and The projected area of the microwave resonator is set to be smaller than the projected area of the object to be frozen.
- the inventor of the present application greatly changes the absorption and transmission of the microwave to the frozen object depending on whether the water of the frozen object is liquid phase water or solid phase ice. Based on the characteristics that the resonance frequency and resonance peak voltage of the resonator change, we found that there is a correlation between the resonance peak voltage and the internal temperature of the object to be frozen. From this discovery, the inventor of the present application determines the internal temperature of the frozen object corresponding to the detected resonance peak voltage by preliminarily determining the correlation between the resonance peak voltage and the internal temperature of the frozen object.
- the inventors of the present application when predicting the internal temperature of the object to be frozen, are calculated by performing regression analysis using the resonance state of the object to be frozen as an explanatory variable and the internal temperature of the object to be frozen as an objective variable. It was found that the internal temperature of the frozen object can be predicted from the calibration curve. Thus, by applying the resonance state detected by the microwave resonator to the calibration curve, the internal temperature of the frozen object in the frozen state can be calculated. Therefore, the internal temperature measurement apparatus of the frozen object which can measure the internal temperature of frozen objects, such as frozen food, is realizable using a microwave resonator.
- the microwaves detected by the microwave generated by the microwave resonator without passing through the object to be frozen can be eliminated. For this reason, the resonance state of the frozen object can be reliably detected.
- the object to be frozen is a solid food packed with contents
- the microwave resonator is configured to detect a resonance peak voltage of the frozen object in a frozen state;
- the temperature calculation unit applies the resonance peak voltage detected by the microwave resonator to a first calibration curve that defines a correlation between an internal temperature of the frozen object in a frozen state and a resonance peak voltage.
- the internal temperature of the frozen object in the frozen state is calculated.
- the microwave resonator is configured to detect a resonance frequency of the frozen object; Whether the object to be frozen is in a frozen state by applying the resonance frequency detected by the microresonator to a second calibration curve that defines the correlation between the internal temperature of the object to be frozen and the resonance frequency
- a freezing state determination unit configured to determine whether or not, The temperature calculating unit is in a frozen state by applying the detected value of the resonance peak voltage when the frozen object determining unit determines that the frozen object is in a frozen state to the first calibration curve. An internal temperature of the object to be frozen is calculated.
- the inventor of the present application greatly changes the absorption and transmission of the microwave to the frozen object depending on whether the water of the frozen object is liquid phase water or solid phase ice. Based on the characteristics of the resonant frequency and resonant peak voltage of the microwave resonator, when the moisture is in the phase transition state, we found that there is a correlation between the resonant frequency and the internal temperature of the object to be frozen did. This correlation has such a relationship that the internal temperature of the object to be frozen is constant until a certain resonance frequency, and the internal temperature is lowered for a while when the resonance frequency is higher than a certain resonance frequency.
- the temperature calculation unit of the invention applies the detected value of the resonance peak voltage when the frozen state determination unit determines that the object to be frozen is in the frozen state to the first calibration curve, Since the internal temperature of the frozen object is calculated, the calculated internal temperature is for the frozen object in the frozen state, and the internal temperature of the frozen object in the frozen state can be accurately calculated.
- the frozen object is a frozen food conveyed by a conveyance line
- the microwave resonator is configured to detect the resonance peak voltage of the frozen food being conveyed by the conveyance line;
- the said temperature calculation part is comprised so that the internal temperature of the said frozen food currently conveyed in the said conveyance line may be calculated.
- the object to be frozen is frozen food conveyed by the conveyance line
- the microwave resonator detects the resonance peak voltage of the frozen food being conveyed by the conveyance line
- the temperature calculation unit is conveyed by the conveyance line. Since the internal temperature of the frozen food inside is calculated, it is possible to inspect all the food temperatures of the frozen food conveyed by the conveyance line in the freezing process of the frozen food. Therefore, the management accuracy of the internal temperature in the freezing process of frozen food can be further increased.
- the microwave resonator is configured to detect the resonance peak voltage of the frozen food in a non-wrapped state or a state packaged by a member that transmits microwaves.
- the microwave resonator detects the resonance peak voltage of the frozen food in an unwrapped state or in a state packaged by a member that transmits microwaves. Therefore, the microwave resonator can detect the resonance peak voltage of the packaged frozen food. In addition, it is possible to detect the resonance peak voltage of the frozen food in an unwrapped state before being packaged. For this reason, the resonance peak voltage of frozen food can be detected during the freezing process of frozen food.
- the frozen object is a plurality of frozen frozen foods formed into small granules
- the microwave resonator is configured to detect a resonance peak voltage and a resonance frequency of the frozen object in a frozen state;
- the temperature calculation unit calculates a calibration curve by performing regression analysis using the resonance peak voltage and resonance frequency detected by the microwave resonator as explanatory variables, and using the internal temperature of the object to be frozen as an objective variable, By applying the resonance peak voltage and resonance frequency detected by the microwave resonator to the line, the internal temperature of the frozen frozen food in a frozen state is predicted, and the predicted internal temperature of the frozen frozen food, In order to increase the density of the plurality of frozen frozen foods in the container that accommodates the plurality of frozen frozen foods when the value representing the degree of correlation with the internal temperature of the frozen frozen foods is smaller than a predetermined value. Is configured to refill the plurality of frozen frozen foods.
- the object to be frozen is a plurality of frozen frozen foods formed into small particles. Therefore, when the gap between the frozen frozen foods stored in the container is larger than that of the solid food, the micro object passing through the gap is used. If a wave is detected, the frozen state of the frozen frozen food may not be detected. Therefore, the inventor of the present application selects a plurality of frozen frozen foods when the value indicating the degree of correlation between the predicted internal temperature of the frozen frozen food and the measured internal temperature of the frozen frozen food is smaller than a predetermined value. In order to increase the density of the plurality of frozen frozen foods in the container to be stored, the plurality of frozen frozen foods are refilled.
- an internal temperature measuring device for an object to be frozen that can measure the internal temperature of a frozen frozen food using a microwave resonator.
- the thickness of the frozen object in the microwave irradiation direction is configured to be 50 mm or less.
- the object to be frozen begins to freeze from the outside, so that the inside of the object to be frozen is difficult to freeze. For this reason, if the internal temperature of the frozen object can be measured, the frozen state of the frozen object can be predicted. For this reason, when the distance that the microwave can reach the center of the frozen object to be frozen is 25 mm, the thickness of the frozen object in the microwave irradiation direction is preferably 50 mm or less. Therefore, in the invention described in claim 15, since the thickness of the object to be frozen in the microwave irradiation direction is 50 mm or less, the microwave can be incident on the center of the object to be frozen. The internal temperature can be measured reliably.
- the object to be frozen is thawed from the outside of the object to be frozen and the inside is thawed last, so when water is generated on the outside after thawing, the microwave is absorbed by the water and inside the object to be frozen. Not reach. For this reason, the internal temperature measuring device of the present application cannot be applied in the thawing process of the object to be frozen.
- a method for measuring an internal temperature of an object to be frozen and an apparatus for measuring the internal temperature of the object to be frozen that can measure the internal temperature of the object to be frozen such as frozen frozen food are provided. Can do.
- It is a schematic block diagram of the microwave cavity resonator which is a part of internal temperature measuring apparatus. It is a graph for demonstrating the resonance characteristic in the case where the sample is put in the microwave cavity resonator, and when it is not put. It is the graph which showed the calibration curve which prescribes
- the figure (a) is the schematic block diagram which filled the granular frozen food (rose frozen food) in the container to the microwave cavity resonator, and the figure (b) is a state where granular frozen food has a high density.
- FIG. 2C is a schematic configuration diagram of a state in which granular frozen food is stored in the container in a low density state. It is a flowchart for calculating
- the frozen food is, for example, one in which gratin is stored in a paper container, and the thickness of the gratin in the microwave irradiation direction is 50 mm or less.
- the frozen food may be a rice cake, hamburger, scallops, peas or the like packaged with resin.
- the internal temperature measuring device 1 for a frozen object includes a microwave oscillator 3 that transmits a microwave, a circulator 5, attenuators 7 and 8, a microwave resonator 10 that brings the microwave into a resonance state, A microwave detector 30 for detecting a microwave and a data processor 40 are included.
- the microwave transmitted from the microwave oscillator 3 is supplied to the circulator 5 through the coaxial cable 50a.
- the circulator 5 has a function of restricting the reflected microwave from propagating to the microwave oscillator 3 side in order to prevent the microwave transmitted from the microwave oscillator 3 from being reflected and damaging the microwave oscillator 3. have.
- the microwave output from the circulator 5 is supplied to the attenuator 7 through the coaxial cable 50b to remove noise.
- the microwave from which the noise has been removed is supplied to the microwave resonator 10 via the coaxial cable 50c.
- the frozen food 60 (gratin) accommodated in the container 61 is mounted on the microwave resonator 10.
- the container 61 is made of paper and is formed in a dish shape, and can transmit microwaves.
- the container 61 is not limited to a dish shape, and may be a bag-like or non-metallic tray that can store the frozen food 60 therein.
- the microwave When a microwave is introduced into the thus configured microwave resonator 10 via the coaxial cable 50 c, the microwave resonates at a frequency that is reflected in the microwave resonator 10.
- the resonance peak voltage changes and the resonance frequency changes (f 0 ⁇ f 1 ) as shown in FIG.
- the vertical axis indicates the resonance peak voltage
- the horizontal axis indicates the resonance frequency f.
- the microwave output from the microwave resonator 10 is supplied to the attenuator 8 through the coaxial cable 50d to remove noise.
- the microwave from which the noise has been removed is detected by the microwave detector 30.
- the microwave detection signal detected by the microwave detector 30 is sent to the data processor 40.
- the data processor 40 is an electronic computer such as a personal computer, for example, and includes a frozen state determination unit 41 and a temperature calculation unit 43.
- the frozen state determination unit 41 applies a microwave resonator to a second calibration curve 51 indicated by a solid line that defines the correlation between the internal temperature (measured internal temperature) of the object to be frozen and the resonance frequency.
- the resonance frequency detected by 10 see FIG. 1
- the internal temperature of the object to be frozen is an actually measured internal temperature when the internal temperature of the object to be frozen is actually measured.
- the internal temperature does not change with respect to the frequency change until the resonance frequency is around 2.2 to 2.3 MHz. It is assumed that it passed through the tropics. That is, it is predicted that a phase transition has occurred in the vicinity of the resonance frequency of 2.2 to 2.3 MHz, and it is considered that the phase transition can be determined by using this index.
- Data of the second calibration curve 51 is prepared in advance for the same object as the object to be frozen (frozen food) to be measured and stored in the data processor 40 (see FIG. 1).
- the frozen state determination unit 41 has a resonance frequency fr corresponding to a point at which the resonance frequency starts to change with respect to the temperature at which the phase transition of the object to be frozen is completed (hereinafter referred to as “freezing point R”).
- freezing point R a resonance frequency fr corresponding to a point at which the resonance frequency starts to change with respect to the temperature at which the phase transition of the object to be frozen is completed.
- the frozen state determination unit 41 determines that the object to be frozen is in an unfrozen state when the measured resonance frequency is smaller than the resonance frequency fr corresponding to the freezing point R.
- the temperature calculation unit 43 (see FIG. 1) generates a first calibration curve 53 that defines the correlation between the internal temperature (measured internal temperature) of the frozen object in the frozen state and the resonance peak voltage.
- the resonance peak voltage detected by the microwave resonator 10 the internal temperature of the frozen object in the frozen state is obtained (estimated).
- the internal temperature of the frozen object in the frozen state is an actually measured internal temperature when the internal temperature of the frozen object is actually measured.
- ⁇ indicates actual measurement values of different objects to be frozen having the same contents (for example, gratin), and the solid line indicates the first calibration curve 53.
- the first calibration curve 53 is provided so as to pass through a substantially average value of a plurality of actually measured values.
- the data of the first calibration curve 53 is prepared in advance for the same frozen object (frozen food) as the measurement object and stored in the data processor 40 (see FIG. 1).
- the internal temperature of the object to be frozen is measured by using, for example, an optical fiber thermometer and setting the tip of the thermometer at the center of the object to be frozen.
- the internal temperature of the object to be frozen can be obtained by applying the resonance peak voltage detected by the microwave resonator 10 to the first calibration curve 53.
- the resonance peak voltage is 3.0 mV
- the internal temperature of the object to be frozen is estimated to be about ⁇ 9.3 ° C.
- the inventor of the present application greatly changes the absorption and transmission of microwaves to the frozen object depending on whether the water of the frozen object is liquid phase water or solid phase ice. Based on the characteristics of the resonant frequency and resonant peak voltage of the microwave resonator changing, the relationship between the resonant peak voltage and the internal temperature of the object to be frozen was investigated. Therefore, as shown in FIG. 6, when the object to be frozen is in a non-frozen state (when the internal temperature is about ⁇ 2.5 ° C. or higher), the resonance peak voltage and the internal temperature of the object to be frozen are between. There is no correlation, but when the object to be frozen is frozen (when the internal temperature is about ⁇ 2.5 ° C.
- the inventor of the present application determines the internal temperature of the frozen object corresponding to the detected resonance peak voltage by preliminarily determining the correlation between the resonance peak voltage and the internal temperature of the frozen object. It was found that it was possible to calculate the internal temperature of
- an internal temperature measurement method for measuring the internal temperature of the object to be frozen by the internal temperature measuring apparatus 1 for the object to be frozen will be described with reference to FIGS.
- a method for obtaining a first calibration curve and a second calibration curve will be described.
- the same inspection object (frozen food) as the inspection object (frozen food 60) is installed in the microwave resonator 10, and the microwave transmitted from the microwave oscillator 3 is microwaved. Irradiate the frozen food 60 in the wave resonator 10 (step 100).
- Microwaves transmitted waves that have passed through the frozen food 60 after being irradiated with microwaves are detected by the microwave detector 30 through the coaxial cables 50d and 50e.
- a resonance peak voltage and a resonance frequency are obtained from the detected microwave by an operator or the like (step 101).
- step 101 a plurality of frozen foods 60 are prepared, the resonance peak voltage and the resonance frequency are obtained for each frozen food 60 by the method described above, and the actual internal temperature is measured.
- an optical fiber thermometer is used for measuring the internal temperature.
- a first calibration curve 52 (see FIG. 4) is created from the obtained resonance frequency and measured internal temperature, with the resonance frequency as the horizontal axis and the internal temperature as the vertical axis (step 102).
- a second calibration curve 51 (see FIG. 5) is created from the obtained resonance peak voltage and the actually measured internal temperature with the resonance peak voltage as the vertical axis and the actually measured internal temperature as the horizontal axis (step 103).
- the second calibration curve 51 is created in step 102 and the first calibration curve 53 is created in step 103.
- the first calibration curve 53 is created in step 102 and step 103 is performed.
- the second calibration curve 51 may be created.
- frozen food 60 (see FIG. 2) is installed in the microwave resonator 10, and the microwave transmitted from the microwave oscillator 3 is converted into the frozen food 60 in the microwave resonator 10. (Step 200).
- step 201 is referred to as a resonance peak voltage detection step (state detection step) and a resonance frequency detection step.
- the frozen state determination unit 41 of the data processor 40 applies the resonance peak frequency obtained in the resonance peak voltage detection step (state detection step) in step 201 to the second calibration curve 51 (see FIG. 4), thereby It is determined whether or not the food 60 is in a frozen state (step 202, frozen state determination step). If it is determined in the frozen state determination step that the frozen food 60 is in a frozen state, the process proceeds to step 204. If it is determined in the frozen state determination step that the frozen food 60 is in an unfrozen state, the process proceeds to step 203. Thus, the fact that the frozen food 60 is in a non-frozen state is notified.
- the notification may be displayed, for example, on a display unit (not shown) provided in the data processor 40 or may be notified by voice from a speaker (not shown) provided in the data processor 40.
- the first calibration curve 53 is frozen by applying the resonance peak voltage detected in the resonance peak voltage detection step (state detection step).
- state detection step The internal temperature of the frozen food 60 in the state is obtained (step 204, temperature calculation step). For this reason, the internal temperature can be estimated with high accuracy in a non-destructive manner without piercing the frozen frozen food 60 in the frozen state.
- the resonance peak voltage detected in the resonance peak voltage detection step is applied to the first calibration curve 53 that defines the correlation between the internal temperature of the frozen food 60 in the frozen state and the resonance peak voltage.
- the internal temperature of the frozen food 60 in the frozen state can be calculated. Therefore, the internal temperature measurement method of the frozen object which can measure the internal temperature of the frozen object such as the frozen frozen food 60 can be realized.
- the detected value of the resonance peak voltage when the frozen food 60 is determined to be frozen in the frozen state determining step is applied to the first calibration curve 53, and the internal temperature of the frozen food 60 is determined. Since the calculation is performed, the calculated internal temperature of the frozen food 60 in the frozen state is symmetrical, and the internal temperature of the frozen food 60 in the frozen state can be accurately calculated.
- the microwave can be incident on the inner center of the frozen food 60, and the microwave can be further transmitted and transmitted. . Therefore, the measurement accuracy of the internal temperature of the frozen food 60 can be improved.
- the frozen food 60 (gratin) that is the object to be frozen is transported by the transport line, and in the resonance peak voltage detection step (state detection step), the microwave is applied to the frozen food 60 being transported by the transport line.
- the resonance peak voltage may be detected using the resonator 10, and in the temperature calculation step, the internal temperature of the frozen food 60 being transported by the transport line may be calculated.
- the freezing process of the frozen food 60 it is possible to inspect all the food temperatures of the frozen food transported by the transport line. Therefore, it becomes possible to improve the management accuracy of the internal temperature in the freezing process of the frozen food 60.
- a microwave cavity resonator is used as the microwave resonator 10 .
- a microwave is transmitted in a state in which the tip portion is in contact with the object to be frozen to the object to be frozen.
- a probe-type microwave resonator that can receive microwaves that are irradiated and reflected may be used.
- FIG. 10 shows a case where the frozen frozen food 60 covered with the nylon package 62 is disposed on the microwave resonator 10.
- the packaging 62 may be any material that can transmit microwaves, and is, for example, linear / low density polyethylene, stretched nylon, K-coated nylon, non-stretched nylon, biaxially stretched polypropylene, polyester, or K-coated polyester.
- the size of the frozen frozen food 60 is larger than the resonant magnetic field region of the microwave generated by the microwave resonator 10, and the height dimension h of the frozen frozen food 60 is 50 mm or less.
- FIG. 11 when the internal temperature of the frozen frozen food 60 (freezing object) in a frozen state packaged using the first calibration curve 53 (see FIG. 5) is estimated from the detected resonance peak voltage.
- a graph showing the relationship between the predicted internal temperature and the actually measured internal temperature obtained by actually measuring the actual internal temperature of the frozen food 60 (the object to be frozen) is described. From this graph, it can be seen that the predicted internal temperature and the measured internal temperature substantially coincide.
- FIG. 12 shows a case where a frozen hamburger frozen food 60 is placed on the microwave resonator 10. Hamburg's frozen food 60 is not packaged.
- the size of the hamburger frozen food 60 is larger than the resonance magnetic field region of the microwave generated by the microwave resonator 10, and the dimension h in the height direction of the hamburger frozen food 60 is 50 mm or less.
- FIG. 13 shows the predicted internal temperature when the internal temperature of the frozen hamburger frozen food 60 (freezing object) is estimated from the detected resonance peak voltage using the first calibration curve 53 (see FIG. 5). And a graph showing the relationship between the actually measured internal temperature of the frozen food 60 (the object to be frozen) and the actually measured internal temperature. From this graph, it can be seen that the predicted internal temperature and the measured internal temperature substantially coincide.
- FIG. 14 shows a case where a frozen scallop frozen food 60 (an object to be frozen) is placed on the microwave resonator 10.
- the scallop frozen food 60 is not packaged.
- the size of the frozen scallop frozen food 60 is larger than the microwave resonant magnetic field generated by the microwave resonator 10, and the dimension h in the height direction of the scallop is 50 mm or less.
- FIG. 15 shows the predicted internal temperature when the internal temperature of the frozen frozen hamburger food 60 (freezing object) is estimated from the detected resonance peak voltage using the first calibration curve 53 (see FIG. 5). And a graph showing the relationship between the actual measured internal temperature of the frozen hamburger food 60 and the measured internal temperature. From this graph, it can be seen that the predicted internal temperature and the measured internal temperature substantially coincide.
- FIG. 16 (a) a plurality of frozen peas foods 60 (freezing objects) in a frozen state are placed in a bottomed cylindrical container 65 having an upper opening on the microwave resonator 10.
- the container 65 is formed of a material that can transmit microwaves (for example, preethylene, polyester, or the like).
- the frozen food 60 an object to be frozen
- the frozen food 60 is a plurality of frozen frozen foods (pea beans) formed into small granules.
- the plurality of peas frozen foods 60 housed in the container 65 are in a state in which the plurality of peas frozen foods 60 are in a lower density than the above-described solid foods such as gratin and hamburg.
- the gap between the peas becomes large, and the microwave passing through the gap is detected, so that the frozen state of the frozen peas food 60 can be detected.
- the inventor of the present application fills the container 65 with a plurality of frozen peas 60 in a high density state (see FIG. 16B), and in this state, freezes the frozen peas in a frozen state.
- Resonant state (resonance frequency, resonance peak voltage) of food 60 is used as an explanatory variable, and peas are obtained from a calibration curve calculated by performing multiple regression analysis using the internal temperature of frozen food 60 of frozen peas as an objective variable. It was found that the internal temperature of the frozen food 60 can be predicted.
- FIG. 17 shows a flowchart for obtaining a calibration curve (prediction formula) by multiple regression analysis.
- a measurement object (frozen peas food 60) was placed in the microwave resonator 10 and transmitted from the microwave oscillator 3.
- Microwaves are irradiated to the frozen food 60 in the microwave resonator 10 (step 300).
- the frozen food 60 of peas which is the measurement object, is filled in the container 65 so as to increase the density.
- the projected area of the microwave resonator is smaller than the projected area of the frozen object, the microwave detected by the microwave generated by the microwave resonator without passing through the measurement object can be eliminated. For this reason, the resonance state of the measurement object can be reliably detected.
- the microwave (transmitted wave) that has passed through the frozen food 60 after being irradiated with microwaves is detected by the microwave detector 30 through the coaxial cables 50d and 50e.
- a resonance peak voltage and a resonance frequency are obtained from the detected microwave by an operator or the like (step 301).
- a plurality of containers 65 containing frozen foods 60 (a plurality of peas) are prepared, and the resonance peak voltage and the resonance frequency are obtained for the frozen foods 60 in the respective containers by the method described above.
- the actual internal temperature is measured.
- an optical fiber thermometer is used for measuring the internal temperature.
- a calibration curve (prediction formula) is calculated by performing multiple regression analysis using the resonance peak voltage and resonance frequency detected by the microwave resonator 10 as explanatory variables and the internal temperature of the object to be frozen as an objective variable (step 302). Calibration curve calculation step).
- a plurality of frozen peas frozen foods 60 are filled into the container 65 (step 400, filling step). And the container 65 is installed in the microwave resonator 10, and the microwaves transmitted from the microwave oscillator 3 are irradiated to the frozen food 60 of a plurality of peas beans in the microwave resonator 10 (step 401, arrangement). Step).
- the microwaves (transmitted waves) that are transmitted through the microwaves irradiated to the frozen foods 60 of the plurality of peas are detected by the microwave detector 30.
- a resonance peak voltage and a resonance frequency are obtained from the detected microwave by an operator or the like (step 402, state detection step, resonance frequency detection step).
- FIG. 19 shows the predicted internal temperature when the internal temperature of the frozen frozen food 60 (peas) in the frozen state is estimated by multiple regression analysis, and the actually measured internal temperature of the actual internal temperature of the frozen object.
- the internal temperature of the frozen frozen food can be measured with high accuracy in a state where a plurality of granular frozen frozen foods (for example, peas) are accommodated.
- the internal temperature of the frozen gratin may be estimated using regression analysis.
- a calibration curve is calculated by performing regression analysis using the resonance peak voltage of the gratin as an explanatory variable and the internal temperature of the gratin as an objective variable.
- the internal temperature of a gratin can be estimated by applying the detected resonance peak voltage to a calibration curve.
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Abstract
Description
凍結対象物の内部温度測定方法であって、
マイクロ波共振器を用いて生成されるマイクロ波の共振磁場に前記凍結対象物を配置する配置ステップと、
前記マイクロ波共振器を用いて凍結状態の前記凍結対象物の共振状態を検出するとともに、温度測定器を用いて前記凍結対象物の内部温度を検出する状態検出ステップと、
前記状態検出ステップで検出される共振状態を説明変数とし、前記温度測定器で検出される前記凍結対象物の内部温度を目的変数として回帰分析を行って検量線を算出する検量線算出ステップと、
前記検量線算出ステップで算出された前記検量線に、前記検出ステップで検出された共振状態を当てはめて、凍結状態にある前記凍結対象物の内部温度を算出する温度算出ステップと、
を備えるように構成される。
前記マイクロ波共振器により生成されるマイクロ波の共振磁場域が前記凍結対象物の全域を覆うように、前記凍結対象物の投影面積より前記マイクロ波共振器投影面積が小に設定されているように構成される。
前記凍結対象物は、中身が詰まった中実食品であり、
前記状態検出ステップで検出される前記共振状態は、凍結状態の前記凍結対象物の共振ピーク電圧であり、
前記温度算出ステップは、前記検量線算出ステップで算出される前記検量線に、前記状態検出ステップで検出される前記共振ピーク電圧を当てはめて、凍結状態にある前記凍結対象物の内部温度を予測するように構成される。
前記状態検出ステップは、前記マイクロ波共振器を用いて、前記凍結対象物の共振周波数を検出する共振周波数検出ステップ、をさらに備え、
前記検量線算出ステップは、前記凍結対象物の内部温度と共振周波数との相関を規定する第2の検量線に、前記共振周波数検出ステップで検出された前記共振周波数を当てはめることで、前記凍結対象物が凍結状態にあるか否かを判定する凍結状態判定ステップ、をさらに備え、
前記温度算出ステップでは、前記凍結状態判定ステップにおいて前記凍結対象物が凍結状態にあると判定されたときの前記共振ピーク電圧の検出値を、前記凍結対象物の内部温度と共振ピーク電圧との相関を規定する第1の検量線に当てはめることで、前記凍結対象物の内部温度を算出するように構成される。
前記凍結対象物は、搬送ラインによって搬送される冷凍食品であり、
前記状態検出ステップでは、前記搬送ラインによって搬送中の前記冷凍食品に対して前記マイクロ波共振器を用いた前記共振ピーク電圧の検出を行い、
前記温度算出ステップでは、前記搬送ラインで搬送中の前記冷凍食品の内部温度を算出する。
前記状態検出ステップでは、非包装状態又はマイクロ波を透過する部材によって包装された状態における前記冷凍食品の前記共振ピーク電圧を検出する。
前記凍結対象物のマイクロ波照射方向における厚さは、50mm以下であるように構成される。
前記凍結対象物は、小さな粒状に形成された複数のバラ凍結食品であり、
複数の前記バラ凍結食品を容器内に充填する充填ステップを備え、
前記状態検出ステップで検出される共振状態は、凍結状態の前記凍結対象物の共振ピーク電圧及び共振周波数であり、
前記温度算出ステップは、前記検量線算出ステップで算出された前記検量線に、前記状態検出ステップで検出された前記共振ピーク電圧及び共振周波数を当てはめて、凍結状態にある前記バラ凍結食品の内部温度を予測し、
この予測された前記バラ凍結食品の内部温度と、実測された前記バラ凍結食品の内部温度との相関の程度を表す値が所定値よりも小さいときに前記複数のバラ凍結食品を充填した前記容器に該複数のバラ凍結食品を再充填して密度を高める再充填ステップを更に備えるように構成される。
凍結対象物の内部温度測定装置であって、
凍結状態の前記凍結対象物の共振状態を検出するためのマイクロ波共振器と、
凍結状態にある前記凍結対象物の共振状態を説明変数とし、前記凍結対象物の内部温度を目的変数として回帰分析を行って算出された検量線に、前記マイクロ波共振器によって検出された前記共振状態を当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成された温度算出部と、を備え、
前記マイクロ波共振器の投影面積が前記凍結対象物の投影面積よりも小に設定されているように構成される。
前記凍結対象物は、中身が詰まった中実食品であり、
前記マイクロ波共振器は、凍結状態の前記凍結対象物の共振ピーク電圧を検出するように構成され、
前記温度算出部は、凍結状態にある前記凍結対象物の内部温度と共振ピーク電圧との相関を規定する第1の検量線に、前記マイクロ波共振器によって検出された前記共振ピーク電圧を当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成されている。
前記マイクロ波共振器は、前記凍結対象物の共振周波数を検出するように構成され、
前記凍結対象物の内部温度と前記共振周波数との相関を規定する第2の検量線に、前記マイクロ共振器によって検出された前記共振周波数を当てはめることで、前記凍結対象物が凍結状態にあるか否かを判定するように構成された凍結状態判定部、をさらに備え、
前記温度算出部は、前記凍結状態判定部によって前記凍結対象物が凍結状態にあると判定されたときの前記共振ピーク電圧の検出値を前記第1の検量線に当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成されている。
前記凍結対象物は、搬送ラインによって搬送される冷凍食品であり、
前記マイクロ波共振器は、前記搬送ラインによって搬送中の前記冷凍食品の前記共振ピーク電圧を検出するように構成され、
前記温度算出部は、前記搬送ラインで搬送中の前記冷凍食品の内部温度を算出するように構成されている。
前記マイクロ波共振器は、非包装状態又はマイクロ波を透過する部材によって包装された状態における前記冷凍食品の前記共振ピーク電圧を検出するように構成されている。
前記凍結対象物は、小さな粒状に形成された複数のバラ凍結食品であり、
前記マイクロ波共振器は、凍結状態の前記凍結対象物の共振ピーク電圧及び共振周波数を検出するように構成され、
前記温度算出部は、前記マイクロ波共振器で検出される共振ピーク電圧及び共振周波数を説明変数とし、前記凍結対象物の内部温度を目的変数として回帰分析を行って検量線を算出し、該検量線に前記マイクロ波共振器で検出された前記共振ピーク電圧及び共振周波数を当てはめて、凍結状態にある前記バラ凍結食品の内部温度を予測し、この予測された前記バラ凍結食品の内部温度と、実測された前記バラ凍結食品の内部温度との相関の程度を表す値が所定値よりも小さいときに前記複数のバラ凍結食品を収容する容器内での該複数のバラ凍結食品の密度を上げるために前記複数のバラ凍結食品を再充填させるように構成される。
前記凍結対象物のマイクロ波照射方向における厚さは、50mm以下であるように構成される。
3 マイクロ波発振器
5 サーキュレータ
7、8 減衰器
10 マイクロ波共振器
40 データ処理器
41 凍結状態判定部
43 温度算出部
50a、50b、50c、50d、50e 同軸ケーブル
51 第2の検量線
53 第1の検量線
60 冷凍食品
61 容器
62 包装
65 容器
R 凍結点
Claims (15)
- 凍結対象物の内部温度測定方法であって、
マイクロ波共振器を用いて生成されるマイクロ波の共振磁場に前記凍結対象物を配置する配置ステップと、
前記マイクロ波共振器を用いて凍結状態の前記凍結対象物の共振状態を検出するとともに、温度測定器を用いて前記凍結対象物の内部温度を検出する状態検出ステップと、
前記状態検出ステップで検出される共振状態を説明変数とし、前記温度測定器で検出される前記凍結対象物の内部温度を目的変数として回帰分析を行って検量線を算出する検量線算出ステップと、
前記検量線算出ステップで算出された前記検量線に、前記検出ステップで検出された共振状態を当てはめて、凍結状態にある前記凍結対象物の内部温度を算出する温度算出ステップと、
を備えることを特徴とする凍結対象物の内部温度測定方法。 - 前記マイクロ波共振器により生成されるマイクロ波の共振磁場域が前記凍結対象物の全域を覆うように、前記凍結対象物の投影面積より前記マイクロ波共振器投影面積が小に設定されている
ことを特徴とする請求項1に記載の凍結対象物の内部温度測定方法。 - 前記凍結対象物は、中身が詰まった中実食品であり、
前記状態検出ステップで検出される前記共振状態は、凍結状態の前記凍結対象物の共振ピーク電圧であり、
前記温度算出ステップは、前記検量線算出ステップで算出される前記検量線に、前記状態検出ステップで検出される前記共振ピーク電圧を当てはめて、凍結状態にある前記凍結対象物の内部温度を予測する
ことを特徴とする請求項1又は2に記載の凍結対象物の内部温度測定方法。 - 前記状態検出ステップは、前記マイクロ波共振器を用いて、前記凍結対象物の共振周波数を検出する共振周波数検出ステップ、をさらに備え、
前記検量線算出ステップは、前記凍結対象物の内部温度と共振周波数との相関を規定する第2の検量線に、前記共振周波数検出ステップで検出された前記共振周波数を当てはめることで、前記凍結対象物が凍結状態にあるか否かを判定する凍結状態判定ステップ、をさらに備え、
前記温度算出ステップでは、前記凍結状態判定ステップにおいて前記凍結対象物が凍結状態にあると判定されたときの前記共振ピーク電圧の検出値を、前記凍結対象物の内部温度と共振ピーク電圧との相関を規定する第1の検量線に当てはめることで、前記凍結対象物の内部温度を算出する
ことを特徴とする請求項3に記載の凍結対象物の内部温度測定方法。 - 前記凍結対象物の前記中実食品は、搬送ラインによって搬送される冷凍食品であり、
前記状態検出ステップでは、前記搬送ラインによって搬送中の前記冷凍食品に対して前記マイクロ波共振器を用いた前記共振ピーク電圧の検出を行い、
前記温度算出ステップでは、前記搬送ラインで搬送中の前記冷凍食品の内部温度を算出する
ことを特徴とする請求項3又は4に記載の凍結対象物の内部温度測定方法。 - 前記状態検出ステップでは、非包装状態又はマイクロ波を透過する部材によって包装された状態における前記冷凍食品の前記共振ピーク電圧を検出する
ことを特徴とする請求項5に記載の凍結対象物の内部温度測定方法。 - 前記凍結対象物のマイクロ波照射方向における厚さは、50mm以下である
ことを特徴とする請求項1から6の何れか一項に記載の凍結対象物の内部温度測定方法。 - 前記凍結対象物は、小さな粒状に形成された複数のバラ凍結食品であり、
複数の前記バラ凍結食品を容器内に充填する充填ステップを備え、
前記状態検出ステップで検出される共振状態は、凍結状態の前記凍結対象物の共振ピーク電圧及び共振周波数であり、
前記温度算出ステップは、前記検量線算出ステップで算出された前記検量線に、前記状態検出ステップで検出された前記共振ピーク電圧及び共振周波数を当てはめて、凍結状態にある前記バラ凍結食品の内部温度を予測し、
この予測された前記バラ凍結食品の内部温度と、実測された前記バラ凍結食品の内部温度との相関の程度を表す値が所定値よりも小さいときに前記複数のバラ凍結食品を充填した前記容器に該複数のバラ凍結食品を再充填して密度を高める再充填ステップを更に備える
ことを特徴とする請求項1又は2に記載の凍結対象物の内部温度測定方法。 - 凍結対象物の内部温度測定装置であって、
凍結状態の前記凍結対象物の共振状態を検出するためのマイクロ波共振器と、
凍結状態にある前記凍結対象物の共振状態を説明変数とし、前記凍結対象物の内部温度を目的変数として回帰分析を行って算出された検量線に、前記マイクロ波共振器によって検出された前記共振状態を当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成された温度算出部と、を備え、
前記マイクロ波共振器の投影面積が前記凍結対象物の投影面積よりも小に設定されている
ことを特徴とする凍結対象物の内部温度測定装置。 - 前記凍結対象物は、中身が詰まった中実食品であり、
前記マイクロ波共振器は、凍結状態の前記凍結対象物の共振ピーク電圧を検出するように構成され、
前記温度算出部は、凍結状態にある前記凍結対象物の内部温度と共振ピーク電圧との相関を規定する第1の検量線に、前記マイクロ波共振器によって検出された前記共振ピーク電圧を当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成されている
ことを特徴とする請求項9に記載の凍結対象物の内部温度測定装置。 - 前記マイクロ波共振器は、前記凍結対象物の共振周波数を検出するように構成され、
前記凍結対象物の内部温度と前記共振周波数との相関を規定する第2の検量線に、前記マイクロ共振器によって検出された前記共振周波数を当てはめることで、前記凍結対象物が凍結状態にあるか否かを判定するように構成された凍結状態判定部、をさらに備え、
前記温度算出部は、前記凍結状態判定部によって前記凍結対象物が凍結状態にあると判定されたときの前記共振ピーク電圧の検出値を前記第1の検量線に当てはめることで、凍結状態にある前記凍結対象物の内部温度を算出するように構成されている
ことを特徴とする請求項10に記載の凍結対象物の内部温度測定装置。 - 前記凍結対象物の前記中実食品は、搬送ラインによって搬送される冷凍食品であり、
前記マイクロ波共振器は、前記搬送ラインによって搬送中の前記冷凍食品の前記共振ピーク電圧を検出するように構成され、
前記温度算出部は、前記搬送ラインで搬送中の前記冷凍食品の内部温度を算出するように構成されている
ことを特徴とする請求項10又は11に記載の凍結対象物の内部温度測定装置。 - 前記マイクロ波共振器は、非包装状態又はマイクロ波を透過する部材によって包装された状態における前記冷凍食品の前記共振ピーク電圧を検出するように構成されている
ことを特徴とする請求項12に記載の凍結対象物の内部温度測定装置。 - 前記凍結対象物は、小さな粒状に形成された複数のバラ凍結食品であり、
前記マイクロ波共振器は、凍結状態の前記凍結対象物の共振ピーク電圧及び共振周波数を検出するように構成され、
前記温度算出部は、前記マイクロ波共振器で検出される共振ピーク電圧及び共振周波数を説明変数とし、前記凍結対象物の内部温度を目的変数として回帰分析を行って検量線を算出し、該検量線に前記マイクロ波共振器で検出された前記共振ピーク電圧及び共振周波数を当てはめて、凍結状態にある前記バラ凍結食品の内部温度を予測し、この予測された前記バラ凍結食品の内部温度と、実測された前記バラ凍結食品の内部温度との相関の程度を表す値が所定値よりも小さいときに前記複数のバラ凍結食品を収容する容器内での該複数のバラ凍結食品の密度を上げるために前記複数のバラ凍結食品を再充填させる
ことを特徴とする請求項9に記載の凍結対象物の内部温度測定装置。 - 前記凍結対象物のマイクロ波照射方向における厚さは、50mm以下である
ことを特徴とする請求項9から14の何れか一項に記載の凍結対象物の内部温度測定装置。
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