JP2005214632A - Method for visualizing micro wave radiation distribution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accurate and inexpensive method for visualizing a micro wave radiation distribution. <P>SOLUTION: This micro wave radiation distribution visualizing method is for visualizing a micro wave radiation distribution in a heating chamber of a high-frequency heating device. According to this method, a temperature color-changing material changing its color at a definite temperature is provided at a prescribed point on a surface of one of objects under measurement whose temperature rises by being exposed to radiation of micro waves. The plurality of objects are disposed at prescribed positions in the heating chamber. The heating device is started to radiate micro waves to the interior of the heating chamber. The radiation distribution is visualized owing to the state of color change of the color-changing material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a microwave radiation distribution visualization method for confirming a microwave radiation distribution in a heating chamber of a high-frequency heating device.

  As a method for visualizing the microwave radiation distribution in the heating chamber of the high-frequency heating device, as shown in FIG. 10, conventionally, as shown in Japanese Patent Laid-Open No. 2003-243146, a discharge is made inside the heating chamber 101a of the high-frequency heating device 101. It has been proposed to arrange a plurality of discharge lamps 110 filled with gas and know the radiation distribution of the microwaves by observing whether or not the discharge lamps 110 emit light. In general, it is difficult to make the microwave radiation distribution state uniform in the heating chamber 101a of the high-frequency heating device 101, and according to this method, the user confirms that the discharge lamp 110 disposed in the heating chamber emits light. Thus, the user can be informed of the microwave radiation distribution state, that is, the microwave is strongly radiated to a certain location inside the heating chamber 101a. Therefore, the user can improve the heating efficiency of the high-frequency heating device by moving the object to be heated to that location.

  However, a plurality of discharge lamps 110 must be arranged inside the heating chamber 101a of the high-frequency heating device 101, and the number of discharge lamps 110 is required to create a discharge bulb (not shown). There was a problem that led to an increase.

  Furthermore, there is a problem that it is difficult to accurately measure the microwave radiation distribution if the discharge lamp 110 is broken, failed, or deteriorated due to long-term use.

Further, the discharge lamp 110 is a discharge bulb that absorbs microwaves and consumes electric power. Even if the energy consumption of one discharge lamp 110 itself is small, if it is consumed by a plurality of discharge bulbs, a large power loss occurs. This leads to a decrease in the heating efficiency. Further, when the high-frequency heating device 101 is used for a long period of time, naturally, a loss due to the discharge bulb occurs every time the heating is performed, and a large amount of power is consumed due to cumulative use.
JP 2003-243146 A

  The present invention has been invented in view of the above-described background art, and its object is to provide a method for visualizing a microwave radiation distribution with high accuracy and low cost.

  In order to solve the above problems, the present invention is a microwave radiation distribution visualization method for visualizing a microwave radiation distribution in a heating chamber of a high-frequency heating device, wherein the measured temperature rises due to microwave radiation. A temperature-changing material that changes color at a predetermined temperature is provided at a predetermined location on the surface of the object, a plurality of objects to be measured are arranged at predetermined positions in the heating chamber, a high-frequency heating device is activated, and a microscopic device is placed inside the heating chamber. This is a method of visualizing a microwave radiation distribution from the discolored state of the temperature discoloring material by radiating waves.

  Further, it is preferable that the object to be measured has a vertically long shape and the temperature discoloring material is provided at a plurality of locations on the surface of the object to be measured.

  In addition, the temperature discoloring material is preferably formed by applying a coating material that discolors due to a temperature change on the surface of the sheet material, and an adhesive material that can be attached to and detached from the surface of the object to be measured is preferably provided. .

  The sheet material is preferably formed by applying a sticky material that dissolves at a predetermined temperature or higher.

  Further, the sheet material is obtained by applying a fine capsule having ink, and the capsule dissolves when the temperature exceeds a predetermined temperature, and the exuded ink adheres to the object to be measured. preferable.

  In addition, it is preferable that the coating material is changed to a plurality of different colors at a plurality of different temperatures.

  In the high-frequency heating device of the present invention, since the microwave radiation distribution can be visualized, the user places an object to be measured in a place where microwaves are strongly radiated, or avoids a place where microwaves are strongly radiated. The object to be measured can be placed.

  1 to 3 show a method for visualizing a microwave radiation distribution according to a first embodiment corresponding to claim 1. In general, when microwaves are radiated to an object to be radiated, if the rate of concentration of the microwaves is large, the temperature rise is also increased according to the rate. For example, if one wants to know the microwave radiation distribution of a certain cross section in the high-frequency heating device 1, an object that absorbs microwaves is prepared in the cross section, and if the temperature distribution of the object is known, the microwave radiation distribution can be known.

  The high-frequency heating device 1 is, for example, a microwave oven, and radiates microwaves to heat an object placed in the heating chamber 1 a in the high-frequency heating device 1.

  The temperature-changing material changes its temperature at a constant temperature, and is, for example, an irreversible temperature indicating material.

  FIG. 2 is formed by applying a coating material 2a, which is a temperature-changing material, on the surface of the sheet material 2, and includes, for example, thermal paper used in a printer.

  In addition, in order to make it difficult to absorb a microwave, the sheet | seat material 2 is good to use the material which is hard to absorb a microwave, or to use a sufficiently thin thing. If the sheet material 2 having good microwave absorption is used, if the microwave radiation time is prolonged, the sheet material itself may generate heat and burn or burn. In addition, when a reversible temperature indicating material or a sheet material coated with a plastic photochromic material is used, it can be used again after it has been cooled for a while after being used for measurement.

  For example, when the bottom surface of the heating chamber 1a of the high-frequency heating apparatus 1 shown in FIG. 1 is the object to be measured 3, in order to know the microwave radiation distribution of the object to be measured 3, the sheet material 2 is first measured. 3 radiates microwaves in close contact with each other. When microwaves are radiated to the device under test 3, the microwave radiation distribution is not constant, so that the temperature of the bottom surface at the location of the device under test 3 rises. Then, discoloration starts beyond the temperature threshold of the coating material 2a applied to the surface of the sheet material 2, and the temperature-rise portion can be visualized.

  When microwave radiation is performed for a long time, the temperature of the entire object to be measured 3 rises and the entire coating material 2a on the sheet material 2 is discolored, so that the microwave radiation can be stopped within a certain time. preferable. For example, if the predetermined temperature of the coating material 2a that changes color on the sheet material 2 is 70 ° C., the time for radiating the microwave is appropriately about 1 minute to 2 minutes.

  Although the bottom surface of the heating chamber 1a is described as the object to be measured 3, the microwave radiation distribution can be visualized similarly on the side surface or the ceiling of the heating chamber 1a.

  FIG. 3 shows a case where the object to be measured 3 in the heating chamber 1a of the high-frequency heating device 1 is a glass turntable 3a. In this case, microwaves are radiated in a state in which the sheet material 2 is brought into close contact with the shape of the turntable 3a on the turntable 3a. When microwaves are radiated to the turntable 3a, since the microwave radiation distribution is not constant, the temperature of the bottom surface of the place where the turntable 3a is located rises. Then, discoloration starts beyond the temperature threshold of the coating material 2a applied to the surface of the sheet material 2, and the temperature-rise portion can be visualized.

  Thus, if the location where the microwaves are concentrated is known, the object to be heated (not shown) can be efficiently heated, so that the high-frequency heating device 1 can be used efficiently.

FIG. 4 shows a second embodiment corresponding to the second aspect. In this case, for example, using the sheet material 2 coated with the coating material 2a, the sheet material 2 is brought into close contact with the object to be measured 3, and the object to be measured 3 is separated from the bottom surface of the high-frequency heating device 1 or the high frequency. It is a method of measuring the microwave radiation distribution of the fixed section of the device under test 3 by radiating the microwave to the device under test 3 while being fixed at a position perpendicular to the bottom surface of the heating device 1. When this method is used, microwaves can be efficiently radiated when the object to be measured 3 is located away from the bottom surface of the heating chamber 1a.

  FIG. 5 shows a sheet material 2 according to a third embodiment corresponding to claim 3. This sheet material 2 is obtained by applying an adhesive material 2b to the back surface of the surface of the sheet material 2 shown in FIG. 2 on which the coating material 2a is applied. In this case, the surface of the sheet material 2 to which the adhesive material 2b is applied and the object to be measured 3 are pasted to increase the adhesion between the sheet material 2 and the object to be measured 3, thereby measuring the object more accurately. In this method, the temperature distribution of the object 3 can be measured. When the sheet material 2 does not adhere to the object to be measured 3, an air layer is formed between the sheet material 2 and the object to be measured 3, and since the thermal conductivity of air is extremely low, the temperature is accurately transmitted to the sheet material 2. In some cases, the discoloration in the sheet material 2 may not be accurately transmitted, and the microwave radiation distribution may not be accurately visualized.

  Note that the measurement method in this case is the same as the method described in the first embodiment, and a description thereof will be omitted.

  6 and 7 show a sheet material 2 according to a fourth embodiment corresponding to the fourth aspect. This sheet material 2 is coated with a sticky adhesive 2c that melts at a predetermined temperature or higher. The sticky material 2c is, for example, a so-called thermal transfer print or iron print, and peels off the sticky material from a film-like material when a certain amount of heat is applied.

  In this case, the surface of the sheet material 2 to which the sticky material 2c is attached is brought into close contact with the measured object 3 side. Then, microwaves are radiated to the object to be measured 3, and the adhesive material 2 c of the sheet material 2 of the elevated part of the object to be measured 3 whose temperature has risen unevenly due to the microwave radiation is welded to the object to be measured 3. In this method, the location 2d where the microwaves are concentrated can be visualized. Therefore, in this method, as shown in FIG. 6, the adhesive material 2 c of the sheet material 2 adheres to the device under test 3, so that the microwave concentration location 2 d of the device under test 3 can be specified.

  FIG. 8 shows a sheet material 2 according to a fifth embodiment corresponding to claim 5. The sheet material 2 is obtained by encapsulating ink in a fine capsule 2e made of a material that dissolves when the temperature exceeds a predetermined temperature. In this case, the surface of the sheet material 2 to which the capsule 2e is attached is brought into close contact with the object to be measured 3 side. Then, microwaves are radiated to the object to be measured 3, and the fine capsules are dissolved and the ink oozes out from the inside of the object to be measured 3 where the temperature is unevenly increased due to the microwave radiation. Therefore, since the exuded ink adheres to the object to be measured 3, the microwave radiation distribution of the object to be measured 3 can be visualized and the position can be specified.

  FIG. 9 shows a sheet material 2 according to a sixth embodiment corresponding to claim 6. As shown in FIG. 9, the sheet material 2 is obtained by applying a coating material that changes to a plurality of different colors at a plurality of different temperatures. For example, a coating material 2a and a sticking material 2c are applied. In this case, the surface of the sheet material 2 to which the coating material 2a and the adhesive material 2c are applied is brought into close contact with the object to be measured 3 side. And it is a method which can visualize the location where the temperature of the object to be measured 3 is radiated by microwaves and the temperature rises unevenly due to the microwave radiation. Therefore, in this method, the microwave radiation distribution can be accurately obtained at a time.

  For example, in the case where a material (a) that is visualized at A ° C. and a material (b) that is visualized at B ° C. are used and the temperature to be visualized is A ° C> B ° C., the material (b) at a certain location If only the visualization has occurred, the temperature at that point has risen to B ° C. or higher and A ° C. or lower. In addition, the material (a) and the material (b) also become A ° C. or higher at the place where the visualization is occurring, and the temperature below B ° C. at the place where no visualization occurs. It can be seen that it is. Since this temperature matches the degree of concentration of the microwave with respect to the object to be measured, it becomes possible to know the degree of concentration of the microwave in more detail. This is the same when three or more kinds of materials for visualization are used. In this case, it is desirable that the material for visualization is made as small dots as possible and is applied in a certain ratio within a certain area.

It is a perspective view in the case of arrange | positioning the sheet | seat material of 1st Embodiment to a high frequency heating apparatus. It is a perspective view of a sheet material same as the above. It is a perspective view at the time of using a turntable for the to-be-measured object same as the above. It is a perspective view in the case of arrange | positioning the sheet | seat material of 2nd Embodiment to a high frequency heating apparatus. It is a sheet material sectional view of a 3rd embodiment. It is a sheet material sectional view of a 4th embodiment. It is a perspective view of a sheet material and a to-be-measured object same as the above. It is a sheet material sectional view of a 5th embodiment, and an enlarged view of ink. It is a sheet material perspective view of a 6th embodiment. It is sectional drawing of the conventional high frequency heating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency heating apparatus 1a Heating chamber 2 Sheet material 2a Temperature discoloring material 2b Adhesive material 2c Adhesive material 2d Microwave concentration location 2e Capsule 3 Device to be measured 3a Turntable

Claims (6)

A microwave radiation distribution visualization method for visualizing microwave radiation distribution in a heating chamber of a high-frequency heating device,
A temperature-changing material that changes color at a constant temperature is provided at a predetermined location on the surface of the object to be measured whose temperature rises due to microwave radiation, and a plurality of objects to be measured are arranged at predetermined positions in the heating chamber. A microwave radiation distribution visualization method, comprising: activating a high-frequency heating device to radiate microwaves into a heating chamber, and visualizing the microwave radiation distribution from the discoloration state of the temperature-changing material.   The three-dimensional microwave radiation distribution in the heating chamber is visualized by forming the object to be measured in a vertically long shape and providing the temperature-changing material at a plurality of locations on the surface of the object to be measured. Visualization method of microwave radiation distribution.   The temperature-changing material is formed by applying a coating material that changes color on the surface of the sheet material, and is provided with an adhesive material that can be attached to and detached from the surface of the object to be measured. The visualization method of the microwave radiation distribution of Claim 1 or 2 characterized by these.   4. The method for visualizing a microwave radiation distribution according to claim 3, wherein the sheet material is formed by applying a viscous material that dissolves at a predetermined temperature or higher.   The sheet material is obtained by applying fine capsules having ink, the capsules are dissolved when the temperature exceeds a predetermined temperature, and the exuded ink adheres to the object to be measured. The visualization method of the microwave radiation distribution of Claim 3 characterized by these.   3. The method for visualizing a microwave radiation distribution according to claim 2, wherein the coating material changes to a plurality of different colors at a plurality of different temperatures.

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