JP2010019624A - Gas temperature distribution detection system and detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas temperature distribution detection system which measures the temperature distribution of gas on a plane parallel to a direction in which the gas flows, and also to provide a detector for use in the detection system. <P>SOLUTION: The detectors for use in the gas temperature distribution detection system are detectors 10a, 10b, 10c for use in the system for detecting the temperature distribution of gas on a plane parallel to the flow direction of the gas on the basis of an image photographed by an infrared camera, the detectors which are provided with: heat receivers 11a, 11b, 11c, which are linear or reticular in shape, for radiating infrared rays in accordance with temperature; and supports 12a, 12b, 12c which arrange the heat receivers on the plane parallel to the flow direction of the gas which is subjected to temperature distribution detection, and support the heat receivers. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas temperature distribution detection system that detects a gas temperature distribution in a plane parallel to a gas flow direction based on an image photographed by an infrared camera, and a detector used in the detection system.

  As one of means for detecting the temperature distribution of an object, there is a method of measuring with an infrared camera. In this method, infrared rays emitted from an object are detected by an infrared camera. However, when the object to be detected is a gas, it is difficult to directly measure with an infrared camera because the gas has a low infrared emissivity. In this case, a method of indirectly detecting the temperature distribution of the gas by measuring infrared rays emitted from an object heated by the gas with an infrared camera may be used.

  As such a method for indirectly detecting the temperature distribution of gas by using infrared radiation, for example, Patent Document 1 discloses a technique for detecting the exhaust temperature of a gas turbine. In this technique, a metal member is provided on the downstream side of the turbine exhaust outlet for discharging the exhaust gas. The metal member is heated to about the same temperature as the exhaust gas by the exhaust gas, and emits infrared rays corresponding to the temperature. Infrared rays emitted from the metal member are input to an infrared radiation thermometer provided outside the exhaust gas passage through the heat-resistant translucent member, and the temperature of the annular portion of the metal member is optically measured. By this method, the temperature distribution in the circumferential direction of the exhaust gas discharged from the turbine exhaust outlet is grasped.

Similarly, Patent Document 2 discloses a technique for detecting a flame temperature distribution as a method for detecting a temperature distribution of a gas using infrared radiation. In such a technique, a rod-shaped detector having high infrared emissivity and heat resistance is inserted into a flame whose temperature distribution is to be detected. This detector increases the surface temperature of each part corresponding to the temperature distribution in the flame, and emits an amount of infrared rays depending on the surface temperature. The infrared rays emitted from the detection body are photographed by an infrared radiation temperature camera, and the temperature distribution of the detection body is displayed as an image on the image display device based on the infrared rays. By this method, for example, the temperature distribution of the high-temperature high-speed combustion flow generated by the operation of the engine can be grasped.
JP-A-1-176922 JP-A-7-190862

  However, the techniques disclosed in Patent Document 1 and Patent Document 2 measure the temperature distribution of gas in a plane orthogonal to the gas flow direction, and the gas temperature in a plane parallel to the gas flow direction. The distribution cannot be measured.

  On the other hand, for example, when you want to measure the temperature distribution in a plane parallel to the gas flow, for gas such as water vapor generated by heating with cooking heaters such as gas stoves and recently popularized IH (Induction Heating) cooking heaters. is there.

  In view of the above problems, the present invention has an object to provide a gas temperature distribution detection system capable of measuring the temperature distribution of a gas in a plane parallel to the gas flow direction, and a detector used in the detection system. To do.

  In order to solve the above problems, a typical configuration of a detector used in a gas temperature distribution detection system according to the present invention is based on the temperature of a gas in a plane parallel to the gas flow direction based on an image taken by an infrared camera. A detector used in a distribution detection system, which is a linear or net-like heat receptor that emits infrared rays according to temperature, and heat reception in a plane parallel to the flow direction of the gas whose temperature distribution is to be detected. A body is disposed, and a support for supporting the heat receptor is provided.

  According to the above configuration, the temperature distribution of the gas in the plane parallel to the gas flow direction is measured by photographing with an infrared camera the radiation emitted by the linear or net-like heat receptor whose temperature has been increased by the heat of the gas. Is possible.

  The reason why the heat receptor is linear or net-like is to reduce the number of heat transfer paths and make it easier to grasp the characteristics of the temperature distribution, for example, while it is formed into a planar shape. In addition, the temperature distribution can be properly captured without obstructing the flow of the gas to be measured.

  The heat receptor may be stretched on a support via an elastic body. By using the elastic body, the tension of the heat receptor can be appropriately maintained, and the slack of the heat receptor can be suppressed. Therefore, it becomes easy to grasp the gas temperature distribution.

  Said heat receptor is good to consist of a piano wire. The piano wire is a metal wire made of carbon steel, which emits infrared light when the temperature rises, so it can be recognized by an infrared camera. Furthermore, the piano wire is widely used and is easily available, so it is excellent as a material for the heat receptor.

  The heat receptor is preferably black. The reason for black is that when the heat receptor is glossy, if the infrared camera is measured with an infrared camera, the infrared camera may misrecognize the temperature. In particular, when the material of the heat receptor is metal, the infrared camera can misrecognize the temperature due to the influence of metallic luster. Suppressing the metallic luster by using black reduces false recognition of temperature by infrared cameras and improves measurement accuracy. In addition, if it is black, it is easy to capture infrared rays with an infrared camera. The treatment for blackening is performed, for example, by spraying a heat-resistant black paint in the case of carbon steel or stainless steel. In the case of an aluminum alloy, for example, black alumite treatment is performed.

  The support has a pillar shape and is provided with a leg at the lower end of the pillar, and detects the temperature distribution of water vapor generated by heating with a cooking heater.

  Water vapor may be generated from food heated by a cooking heater, but the temperature of this water vapor cannot be measured directly with an infrared camera because the water vapor's infrared emissivity is small. Therefore, there is a need for a detector that emits infrared rays so that the heat of water vapor is absorbed by the heat receptor and measurement by an infrared camera is possible. Therefore, such a detector is particularly effective when used for the above-described detection.

  You may comprise as a gas temperature distribution detection system provided with the detection body concerning this invention. A typical configuration of such a gas temperature distribution detection system is a gas temperature distribution detection system that detects a gas temperature distribution in a plane parallel to the gas flow direction based on an image captured by an infrared camera, and captures infrared rays. A linear or reticulated heat receptor that emits infrared rays according to temperature, comprising a camera system equipped with a possible infrared camera and a detector used to simplify imaging with the infrared camera. And a support for supporting the heat receptor in a plane parallel to the flow direction of the gas whose temperature distribution is to be detected, and the camera system is formed by an infrared camera. The gas temperature distribution detection system can be obtained.

  According to such a configuration, it is possible to measure the temperature distribution of the gas in a plane parallel to the gas flow direction.

  According to the present invention, it is possible to measure the temperature distribution of gas in a plane parallel to the gas flow direction based on an image taken by an infrared camera.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an external view of a detector for a gas temperature distribution detection system according to the present embodiment. The gas temperature distribution detection system detector 10 includes a heat receptor 11 and a support 12 that supports the heat receptor 11.

  The shape of the heat receptor 11 is preferably linear (11a, 11b) or net 11c as shown in FIG. In the case of the linear heat receptor (11a, 11b), a continuous distribution of temperature is obtained in the axial direction of the line, and a discontinuous distribution of temperature is obtained in the direction in which the lines are arranged in accordance with the distance between the lines. The distance between the lines and the size of the mesh can be selected according to the resolution required for measuring the temperature field of the detection target. The narrower the line spacing and the smaller the mesh size, the closer the temperature distribution obtained by the infrared camera is to a continuous distribution and the higher the spatial resolution of the measurement.

  In order to facilitate temperature imaging with an infrared camera, the linear heat receptor 11 preferably has a round cross section. This is because, when the cross section is round, the heat transfer rate from the gas to the heat receptor 11 is increased, and thus the characteristics of the temperature distribution of the gas can be expressed more accurately.

  The heat receptor 11 is, for example, a piano wire. Piano wire is excellent in terms of easy handling because it is strong against pulling. You may use the tungsten wire whose heat conductivity is smaller than a piano wire. This is because the smaller the thermal conductivity, the less the heat conduction in the axial direction, and thus the characteristics of the gas temperature distribution can be expressed more accurately. Similarly, nylon wire can be used. A material such as plastic rubber or nitrile rubber having high infrared emissivity and high heat resistance may be used. Since the object emits infrared rays from the surface according to its temperature, a material suitable for the heat receptor 11 may be used depending on physical characteristics such as infrared emissivity and availability.

  The diameter of the cross section of the linear heat receptor 11 is preferably about 0.5 mm to 1 mm. This is because, if a thin line is used, the responsiveness to a temperature change is enhanced, so that the change in the temperature distribution of the gas can be expressed with better followability.

  The heat receptor 11 is processed to be black, for example. Since metal wires such as piano wires have a metallic luster, the infrared camera may misrecognize the temperature. By using black, false recognition can be reduced and highly accurate infrared camera measurements can be made.

  Although not clearly shown in FIG. 1, thermometers (for example, thermocouples) may be provided between the heat receptors 11 at appropriate intervals. By correcting the temperature of the heat receptor 11 near the thermocouple with the temperature of the thermocouple, the measured temperature of the gas becomes more accurate. For example, thermocouples can be stretched parallel to the heat receptor 11 every 5 or 10 heat receptors 11. As the thermocouple, for example, a general one such as copper-constantan can be used.

  The support 12 has a function of supporting the heat receptor 11. As shown in FIG. 1, for example, the end of the linear heat receptor 11 is fixed to the support 12 so that the heat receptor 11 is supported. The support 12 is, for example, a columnar square member made of aluminum. It can be made independent by attaching a leg to the lower end of a 2 cm square. FIG. 1 shows an example of a configuration in which the detection body 10 is self-supported using the support 12. For example, when the detection body 10 can be self-supported only by the heat receptor 11, the heat receptor 11 itself is used as the support. It has the function of.

  In addition, when there is a structure for attaching the support body 12 to the other party on which the detection body 10 is to be disposed, the legs may not be provided.

  The detector 10 is used by being arranged in a plane parallel to the flow direction of the gas whose temperature distribution is to be detected. When heated by the heat of the gas, the heat receptor 11 rises in temperature and emits infrared rays from its surface according to the temperature. By photographing infrared rays emitted from the heat receptor 11 with an infrared camera, it is possible to indirectly detect the temperature distribution of the gas.

  FIG. 2 is a view for explaining a connection portion between a heat receptor and a support constituting the detector for a gas temperature distribution detection system according to the present embodiment. For example, the linear or net-like heat receiving body 11 has an elastic body connecting portion 13 attached to an end portion thereof, and is stretched around the threaded screw body 15 via the elastic body 14. The threaded screw body 15 has a thread groove and is fixed to the support body 12 with a nut. Since the slack of the heat receptor 11 can be suppressed by the tension of the elastic body 14, the linear temperature distribution of the gas can be measured in the axial direction of the heat receptor 11. When used for measurement of high-temperature gas, the elastic body connecting portion 13 is made of a material having high heat resistance. When it is not necessary to maintain the tension of the heat receptor 11, the heat receptor 11 may be fixedly supported by being connected to the outside by connection means such as a rope.

  FIG. 3 is an explanatory diagram showing a state in which the temperature distribution of water vapor generated from the food heated by the cooking heater is measured using the gas temperature distribution detection system according to the present embodiment. FIG. 3A shows an elevation view of the electric heater 50 in which such a system is arranged, and FIG. 3B shows a side view.

  In FIG. 3, the gas temperature distribution detection system includes a detection body 10 including a heat receptor 11 and a support 12, and a camera system including an infrared camera 20 and a display device 30. The detector 10 is arranged on the electric heater 50 so as to be inserted in a plane parallel to the flow direction of the water vapor 70 rising from the pan 60 placed on the cooking heater (for example, the electric heater 50). .

  When the electric heater 50 is turned on and the food in the pan 60 is heated and the water vapor 70 is generated, the heat receptor 11 is heated by the water vapor 70, and infrared rays are emitted from the heated portion. The emitted infrared rays are photographed by the infrared camera 20 and the image is displayed on the display device 30. With such a detection system, the temperature distribution of water vapor rising from the pan 60 can be visualized and measured.

  The cooking heater is not limited to an electric heater such as an IH heater or a halogen heater, but may be a gas stove. Further, the present invention is not limited to the measurement of the temperature distribution of water vapor, but can also be used to measure the temperature distribution of the upper air of oil heated on a cooking heating device, for example.

  FIG. 4 is an image showing a state in which water vapor rises from a pan placed on a cooking heater. It can be seen that the water vapor 70 rises in the direction of the black arrow from the pot 60 placed on the electric heater 50 and heated. Although not clearly distinguishable from FIG. 4, the detection body 10 is placed on the electric heater 50 so as to be inserted in a plane parallel to the flow direction of the water vapor 70 rising from the pan 60.

  FIG. 5 is an image obtained by actually measuring the temperature distribution of the water vapor rising from the pan placed on the cooking heater using the gas temperature distribution detection system according to the present embodiment.

  It can be seen that the temperature distribution of water vapor rising from the pan is continuously detected.

  INDUSTRIAL APPLICABILITY The present invention can be used as a gas temperature distribution detection system that detects a gas temperature distribution in a plane parallel to the gas flow direction based on an image photographed by an infrared camera and a detection body used in the detection system.

It is an external view of the detection body for gas temperature distribution detection systems concerning this embodiment. It is a figure explaining the connection part of the heat receptor and support which comprise the detection body for gas temperature distribution detection systems concerning this embodiment. It is explanatory drawing showing a mode that the temperature distribution of the water vapor | steam generate | occur | produced from the foodstuff heated with the heating apparatus for cooking using the gas temperature distribution detection system concerning this embodiment was measured. It is the image which showed a mode that water vapor rose from the pan placed on the heating apparatus for cooking. It is the image which measured the temperature distribution of the water vapor | steam rising from the pan placed on the heating apparatus for cooking using the gas temperature distribution detection system concerning this embodiment.

Explanation of symbols

10, 10a, 10b, 10c ... detecting bodies 11, 11a, 11b, 11c ... heat receiving bodies 12, 12a, 12b, 12c ... support 13 ... elastic body connecting part 14 ... elastic body 15 ... threaded screw body 16 ... nut 20 ... Infrared camera 30 ... Display device 50 ... Electric heater 60 ... Pot 70 ... Water vapor

Claims (6)

A detector used in a system for detecting a temperature distribution of a gas in a plane parallel to a gas flow direction based on an image taken by an infrared camera,
A linear or reticulated heat receptor that emits infrared light depending on the temperature;
A support body for supporting the heat receptor by disposing the heat receptor in a plane parallel to the flow direction of the gas whose temperature distribution is to be detected;
A detector for a gas temperature distribution detection system.   The detector for a gas temperature distribution detection system according to claim 1, wherein the heat receptor is stretched over the support via an elastic body.   The said heat receptor consists of a piano wire, The detection body for gas temperature distribution detection systems described in Claim 1 or 2 characterized by the above-mentioned.   The detector for a gas temperature distribution detection system according to any one of claims 1 to 3, wherein the heat receptor is black.   5. The support according to claim 1, wherein the support has a pillar shape and is provided with a leg at a lower end of the pillar, and detects a temperature distribution of water vapor generated by heating by a cooking heater. A detector for a gas temperature distribution detection system described in any of the above. A gas temperature distribution detection system for detecting a temperature distribution of a gas in a plane parallel to a gas flow direction based on an image taken by an infrared camera,
A camera system including an infrared camera capable of photographing infrared rays, and a detector used for simplifying photographing with the infrared camera;
The detector includes a linear or net-like heat receptor that emits infrared rays according to temperature, and
The heat receptor is disposed in a plane parallel to the flow direction of the gas whose temperature distribution is to be detected, and a support for supporting the heat receptor,
The gas temperature distribution detection system, wherein the camera system is capable of photographing the heat receptor with the infrared camera.

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