JP2011017612A - Temperature distribution detection system and detecting object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature distribution detection system detecting temperature distribution in a space having a non-simple shape, and to provide a detecting object to be used in a system like this.SOLUTION: The detecting object to be used in this temperature distribution detection system is equipped with: guide rails for holding moving bodies movably; connection portions which connect the guide rails and form a frame body closed together with the guide rails, and set the angles which the guide rails connected to both sides of each other form between them, to predetermined angles; and string-like heat acceptors both ends of which are connected to mutually-different moving bodies, and which radiate infrared rays in accordance with their temperatures.

Description

  The present invention relates to a temperature distribution detection system that detects a temperature distribution in a space 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 detecting infrared rays emitted from the object with an infrared camera. When measuring the temperature distribution in the space, it is conceivable to measure the temperature distribution of the gas existing in the space with an infrared camera. However, since gas has a low infrared emissivity, it is difficult to directly measure gas with an infrared camera. Therefore, a method of detecting a temperature distribution in the space by installing a medium to which the heat of the gas is transmitted in the space and measuring infrared rays emitted from the medium with an infrared camera may be used.

  As a method for detecting the temperature distribution of a space using such a medium as a heat receptor, for example, Patent Document 1 discloses a plurality of detections formed in a material having a small heat capacity and installed in a space where the temperature distribution is to be measured. A temperature distribution measuring device inside a building or the like, which includes a plate and an infrared radiation thermometer that measures the temperature of the detection plate, is disclosed. According to such an apparatus, the temperature distribution in the space can be easily and quickly measured without reading error.

  Similarly, as a method for detecting a temperature distribution in a space using a medium as a heat receptor, Patent Document 2 arranges a heat receiving material having a shape that can be inserted into a space with a temperature change and can ignore the influence of heat flow. However, in a temperature field temperature measurement device that measures the temperature of the heat receiving material with an infrared camera, a temperature field temperature measuring device in which the surface of the heat receiving material inserted into the space is a black thin line is disclosed. According to such an apparatus, it is possible to measure extremely rapidly and simply than the measurement of the temperature field conventionally measured by the temperature sensor.

Japanese Patent Laid-Open No. Sho 63-1003000 Japanese Patent Laid-Open No. 11-6770

  However, the arrangement of the detection plate of Patent Document 1 and the heat receiving material of Patent Document 2 is fixed in advance, and the arrangement cannot be changed. Therefore, for example, when detecting the temperature distribution of a space having a non-simple shape, such as detecting the temperature distribution of the front surface of a refrigerated showcase, the detection plate and the heat receiving material are matched to the shape of the space to be detected. There was a problem that the arrangement could not be adjusted flexibly and accurate measurement could not be performed.

  In view of such problems, an object of the present invention is to provide a temperature distribution detection system capable of detecting a temperature distribution in a space having a non-simple shape and a detection body used in such a detection system.

  In order to solve the above-described problems, a typical configuration of a detection body used in the temperature distribution detection system according to the present invention includes a guide rail that holds the movable body movably and a guide rail that is connected and closed together with the guide rail. A connecting part that sets the angle between the guide rails connected to both sides of the guide rail to a predetermined angle, and both ends are connected to different moving bodies, and radiates infrared rays according to temperature. And a string-like heat receptor.

  According to the above configuration, the shape of the frame can be changed in accordance with the shape of the space in which the temperature distribution is to be detected by adjusting the angle between the guide rails connected to both sides of the connecting portion as the center. . Furthermore, by moving the moving body, changing the position of the string-like heat receptor connected to the moving body, and adjusting the distance between the heat receptors and the inclination of the heat receptor flexibly, the temperature distribution The heat acceptor can be accurately arranged according to the shape of the space in which to detect. Therefore, even in a space having a non-simple shape, the temperature distribution can be accurately detected.

  Here, the moving body is a member that moves along the guide rail, and the moving method includes, for example, sliding and turning, but is not limited thereto. In addition, the reason why the heat receptor is formed in a string shape is that, for example, the heat transfer path from the periphery of the heat receptor is reduced and the characteristics of the temperature distribution in the space can be easily grasped compared with the case where the heat receptor is formed in a plane shape. It is. If it is a string shape, the influence of the detection body in the detection of the temperature distribution can be reduced as much as possible without inhibiting the flow of the airflow in the space to be detected.

  The heat receptor is preferably silicon rubber containing carbon. Carbon can be contained in silicon rubber, for example, in the form of carbon powder or carbon nanotubes. Since silicon rubber has high elasticity, by using silicon rubber for the heat receptor, the flexibility of the heat receptor can be increased and the heat receptor can be expanded and contracted. For this reason, according to the shape of the frame formed by the guide rail and the connecting portion, it is possible to change the length in the longitudinal direction of the heat receptor while keeping the heat receptor in a string shape. The heat receptor can be more accurately arranged in the space where the temperature distribution is to be detected.

  Further, since silicon rubber has a low thermal conductivity, when it is used for a string-like heat receptor, heat conduction in the longitudinal direction of the heat receptor is reduced. Therefore, the temperature at each position in the space can be expressed more accurately. Furthermore, silicon rubber is suitable as a heat receptor material because of its excellent heat resistance and easy availability.

  Carbon is excellent in thermal radiation, and when taken with an infrared camera, the temperature distribution in the space can be captured more accurately. Therefore, by including carbon in silicon rubber, it becomes possible to detect the temperature distribution of the space more accurately in combination with the small thermal conductivity of silicon rubber.

  The heat receptor is preferably stretched on the moving body via an elastic body. By using the elastic body, the tension of the heat receptor can be appropriately maintained, and the slackness of the heat receptor can be suppressed. Accordingly, since the temperature distribution of the space can be measured linearly in the longitudinal direction of the heat receptor, the temperature distribution can be easily grasped.

  It is preferable that the heat receiving body is stored in a winding unit connected to the moving body so as to be freely wound, and is drawn out from the winding unit and connected to the moving body. When measuring the temperature distribution in the space, the heat receptor is unwound from the winding unit, and at the end of the measurement, the heat receptor is stored in the winding unit. Handling becomes easy.

  You may comprise as a temperature distribution detection system provided with the detection body concerning this invention. A typical configuration of such a temperature distribution detection system includes a camera system including an infrared camera capable of photographing infrared rays, and a detection body used for simplifying photographing with the infrared camera, and the detection body moves. A guide rail that holds the body movably and a linkage that connects the guide rail to form a closed frame together with the guide rail, and sets the angle between the guide rails connected to both sides of the guide rail to a predetermined angle. And a string-shaped heat receptor that is connected to a moving body whose ends are connected to each other, are arranged in a space where temperature distribution is to be detected, and emits infrared rays according to temperature, and the camera system is an infrared camera Thus, the gas temperature distribution detection system can be obtained.

  According to such a configuration, the temperature distribution is detected even in a space having a non-simple shape by photographing the heat receptor arranged in the space with the infrared camera in accordance with the shape of the space in which the temperature distribution is to be detected. It can be detected accurately.

  According to the present invention, it is possible to accurately detect the temperature distribution of a space having a non-simple shape.

(A) is a schematic external view of the detection body for temperature distribution detection systems in the embodiment of the present invention. (B) is a side view of the detection body for temperature distribution detection systems, and is a view on arrow A in (a). (C) is a figure explaining the state which the detection object for temperature distribution detection systems was folded. It is a figure explaining the structure of a guide rail and a connection part. It is a figure explaining the structure of a guide rail and a moving body. It is a figure explaining the connection part of a heat receptor and a moving body. It is a figure explaining a winding-up part. It is a figure explaining the application example of the temperature distribution detection system in embodiment of this invention. It is a figure explaining the relationship between the diameter of a heat receptor, and the picked-up image by an infrared camera.

  Exemplary embodiments of a temperature distribution detection system according to the present invention and a detector used in the detection system will be described below in detail with reference to the accompanying drawings.

  Fig.1 (a) is a schematic external view of the detection body for temperature distribution detection systems in embodiment of this invention. FIG.1 (b) is a side view of the detection body for temperature distribution detection systems, and is an A arrow view of (a). A temperature distribution detection system detection body (hereinafter referred to as “detection body” as appropriate) 10 includes a moving body 11, a guide rail 12 on which the moving body 11 moves, a connecting portion 13 that connects and connects the guide rails 12, and a movement. A heat receptor 14 is connected to the body 11 at both ends.

  The temperature distribution detection system detection body 10 has a closed frame formed by a guide rail 12 and a connecting portion 13 that connects the guide rail 12. The guide rails 12 that are adjacent to each other via the connecting portion 13 are set to have a predetermined angle with respect to the connecting portion 13. For example, as shown by the solid line in FIG. 1A, the entire frame can be formed to protrude outward from the frame, or a part of the frame protrudes to the inside of the frame as shown by the dotted line. It can also be formed.

  FIG.1 (c) is a figure explaining the folded state of the detection body for temperature distribution detection systems. Since the angle formed between the guide rails 12 connected to both sides of the connecting portion 13 can be set to a predetermined angle, the frame body can be folded compactly as shown in FIG. At this time, the moving body 11 and the heat receiving body 14 may remain attached to the frame body, or may be removed from the frame body.

  FIG. 2 is a diagram illustrating the structure of the guide rail and the connecting portion. FIG. 2A is a schematic enlarged view of the end portion of the guide rail 12 and the connecting portion 13, and FIG. 2B is a view taken in the direction of arrow B in FIG. As shown in FIG. 2, the guide rails 12 are connected to each other by, for example, making holes in the end portions of the respective guide rails 12 and overlapping the end portions with each other. By fitting the cylindrical fastener as the connecting portion 13, the angle between the guide rails 12 can be fixed to a predetermined angle. When the guide rail 12 and the connecting portion 13 are made of, for example, an aluminum material, the guide rail 12 and the connecting portion 13 are light and easy to handle. The guide rails 12 may all have the same length or different lengths. Making them all the same length makes it easier to manufacture. For example, when the length of the guide rail 12 is about 30 cm to 50 cm, it is suitable for detecting a temperature distribution in a relatively large space.

  FIG. 3 is a diagram illustrating the structure of the guide rail and the moving body. FIGS. 3A and 3B are cross-sectional views of the guide rail 12 cut along a plane orthogonal to the longitudinal direction of the guide rail 12. As shown in FIG. 3A, the guide rail 12 is formed with a groove along the longitudinal direction on the surface facing the inner side of the frame, for example, and the guide rail 12 is moved along the groove in the longitudinal direction. A movable body 11 that is freely movable is held. As illustrated in FIG. 3A, the moving body 11 has a cross-sectional shape in which, for example, two quadrangles are arranged in contact with each other, and can slide in the groove of the guide rail 12. The movable body 11 may include wheels so as to be movable along the guide rail 12. The moving body 11 may be provided with a stopper so as to be fixed at an arbitrary position on the guide rail 12. The stopper has, for example, a mechanism for pressing the moving body 11 against the guide rail 12 or a pin-shaped member that is inserted before and after the moving body 11 on the guide rail 12 to prevent the moving body 11 from moving. Can do.

  As shown in FIG. 3 (b), the guide rail 12 is made of a magnetic material, the moving body 11 is made of a magnet, and the magnetic material is magnetically adsorbed to the magnet. It may be possible to arrange at any position on the guide rail 12. According to such a configuration, it is not necessary to separately provide a member such as a stopper for preventing the movement of the moving body 11, and thus the structure of the detection body 10 can be simplified. 3 (a) and 3 (b), the heat receptor 14 is directly connected to the moving body 11, but the connection of the heat receptor 14 to the moving body 11 is as described later. It may be through.

  FIG. 4 is a diagram for explaining a connection portion between the heat receptor and the moving body. As shown in FIG. 4, the heat receptor 14 has, for example, a heat receptor connection portion 42 whose tip is an annular shape at the end, and this heat receptor connection portion 42 is one hook of the elastic body 15. The other hook-shaped tip portion of the elastic body 15 is connected to a handle-shaped moving body connecting portion 41 provided on the moving body 11. The movable body connecting portion 41 may have a shape in which a hole is provided, and the elastic body 15 may be connected to the movable body connecting portion 41 by engaging a hook-shaped tip portion of the elastic body 15 in the hole. The movable body connecting portion 41 may be connected to the elastic body 15 by forming the moving body connecting portion 41 in the shape of a saddle screw. By using the elastic body 15 at the connection portion between the heat receptor 14 and the moving body 11, the slackness of the heat receptor 14 can be suppressed using the tension of the elastic body 15, and the longitudinal direction of the heat receptor 14 can be suppressed. A linear temperature distribution in the space can be measured.

  FIG. 5 is a diagram illustrating the winding unit. As shown in FIG. 5, the heat receptor 14 may be accommodated in the winding unit 16 so as to be freely wound. The heat receptor 14 is unwound from the winding unit 16 when the temperature distribution of the space is measured, and is connected to the moving body connection unit 41 by the heat receptor connection unit 42. The winding unit 16 is connected to the moving body connection unit 41 by the winding unit connection unit 43. At the end of the measurement, the heat receptor 14 is wound around the central axis of the winding unit and stored.

  The winding portion 16 has a biasing member in a winding direction such as a spring, so that the heat receiving body 14 can be easily wound or a winding braking member is provided. The feeding can be stopped at a predetermined position. With this configuration, the heat receptor 14 can be stored in a compact manner, so that handling such as transport of the heat receptor 14 can be facilitated. Moreover, the connection of the heat receptor 14 to the moving body 11 can be facilitated. In addition, the winding part connection part 43 may be connected to the mobile body connection part 41 via the elastic body 15. The slackness of the heat receptor 14 can be suppressed through the elastic body 15.

  The moving body 11 to which the heat receptor 14 is connected is arbitrary, and an appropriate connection may be selected in order to accurately arrange the heat receiver 14 in accordance with the shape of the space in which the temperature distribution is to be detected. it can. The heat receptor 14 is preferably in the form of a string and has a round cross section. The string-like shape can reduce the heat transfer path from the periphery of the heat receptor 14, and can easily capture the characteristics of the temperature distribution in the space. Moreover, since the flow of the surrounding air current is not obstructed, the influence of the heat receptor 14 in detecting the temperature distribution can be minimized. The reason why the cross section is round is that the heat transfer rate from the surroundings to the heat receptor 14 is increased, and thus the characteristics of the temperature distribution in the space can be expressed more accurately. The heat receptor 14 may have a shape other than the string shape because the temperature distribution can be detected as long as it can maintain a certain shape during the measurement of the temperature distribution in the space.

  The heat receptor 14 is preferably made of a material having a low thermal conductivity, and for example, silicon rubber or nylon is used. This is because the heat conductivity in the longitudinal direction of the heat receptor 14 is less when the thermal conductivity is smaller, and thus the characteristics of the temperature distribution in the space can be expressed more accurately. Silicon rubber and nylon are suitable for the heat receptor 14 because of their high heat resistance.

  Since silicon rubber has high elasticity, when used as the heat receptor 14, it is excellent in that the slackness of the heat receptor 14 can be suppressed by the tension of the silicon rubber itself. Thereby, the temperature distribution of the space can be measured linearly in the longitudinal direction of the heat receptor 14. When nylon or a material with insufficient elasticity is used for the heat receptor 14, an elastic body such as rubber or a spring is connected to the end of the heat receptor 14 and stretched on the moving body 11, so that it is the same as silicon rubber. Thus, it becomes possible to measure the linear temperature distribution of the space.

  The heat receptor 14 is further preferable if carbon powder or carbon nanotubes are contained in silicon rubber. Carbon is excellent in thermal radiation. By incorporating this into silicon rubber in the form of powder or carbon nanotubes, carbon is scattered in the silicon rubber, taking advantage of both the low thermal conductivity of silicon rubber and the high thermal emissivity of carbon. Can do. By photographing the heat-receiving body 14 of silicon rubber containing carbon with the infrared camera 21, the characteristics of the temperature distribution in the space can be captured more accurately. A material suitable for the heat receptor 14 can be selected according to physical characteristics such as infrared emissivity and availability.

  The temperature distribution detection system detection body 10 folded in a compact manner is carried to a space in which the temperature distribution is to be detected, where the guide rails 12 connected to both sides of the connection portion 13 are formed at an angle between them. By adjusting and setting to a predetermined angle, the shape of the frame body is formed in accordance with the shape of the space. Then, the moving body 11 is moved along the guide rail 12, and the moving body is fixed at an appropriate position using a stopper as necessary, so that the heat receptor 14 is placed at a position suitable for the temperature distribution in the space. Deploy. Thereby, even if it is the space which has a non-simple shape, the heat receptor 14 can be arrange | positioned in the position suitable for the detection of the temperature distribution of the space.

  FIG. 6 is a diagram for explaining an application example of the temperature distribution detection system in the embodiment of the present invention. The example which detects the temperature distribution of the space ahead of a refrigerated showcase is shown. The temperature distribution detection system 30 includes a detection body 10 and a camera system 20. The camera system 20 includes an infrared camera 21 that can capture infrared rays, and a display device 22 that is connected to the infrared camera 21 and displays an image captured by the infrared camera 21. For example, a personal computer (PC) can be used as the display device 22, but it may be incorporated in the infrared camera 21.

  As shown in FIG. 6, the refrigerated showcase 40 may have a U-shaped cross section. In order to detect the temperature distribution in the space in front of the refrigerated showcase 40, the temperature distribution detection system detector 10 has a frame shape that is suitable for detecting the temperature distribution in the space in front of the refrigerated showcase 40. Are formed and arranged. By appropriately moving the moving body 11 held by the guide rail 12 and flexibly adjusting the interval between the heat receiving bodies 14 connected to the moving body 11 and the inclination of the heat receiving body 14, the heat receiving body 14. Is arranged at a position suitable for detecting the temperature distribution of the space. The detection body 10 can be made self-supporting by appropriately selecting the material of the guide rail 12, and the detection body 10 can be arranged vertically by providing a support member and supporting the frame body. You can also.

  The cold air flowing out of the refrigerated showcase 40 cools the heat receptor 14 provided in the detection body 10, and the heat receptor 14 emits infrared rays according to its temperature. The heat receptor 14 is photographed by an infrared camera 21 arranged so that the heat receptor 14 can be photographed, and an image by the infrared camera 21 is sent to the display device 22. The temperature distribution in the space in front of the refrigerated showcase 40 can be detected from the image displayed on the display device 22. Therefore, even in a non-simple shape space such as a space in front of the refrigerated showcase 40, the temperature distribution can be accurately detected.

  FIG. 7 is a diagram illustrating the relationship between the diameter of the heat receptor and the image captured by the infrared camera. FIG. 7 shows an imaging surface of the infrared camera 21, and one square of K (μm) on one side corresponds to one pixel of the infrared camera 21, and a plurality of pixels are arranged in the row direction and the column direction. . The hatched portion is an image of the heat receptor 14 taken by the infrared camera 21. The size of the pixel is generally about 9 μm. Depending on the distance between the lens of the infrared camera 21 and the heat receptor 14 to be used, the focal length of the infrared camera 21, etc., the heat receptor 14 as the subject is the lens of the infrared camera 21. The size of the image is determined.

  As shown in FIG. 7, when the size of one pixel is K (μm / pixel), the diameter of the string-like heat receptor 14 is D, and the diameter d of the heat receptor 14 on the imaging surface of the infrared camera 21 is d. When (μm) is expressed by d = nK (μm), it is preferable to determine the diameter of the heat receptor 14 so that n is 2 or more. In general, in one pixel, when the image of the heat receptor 14 does not occupy the entire pixel, a sufficient light receiving area in the unit pixel cannot be secured. Therefore, the infrared camera 21 sets the temperature of the heat receptor 14 to the actual temperature. The temperature distribution in the space becomes inaccurate.

  That is, in each pixel, the entire pixel is occupied by the image of the heat receptor 14 as shown in the row C of FIG. 7, or the image of the heat receptor 14 exists at the pixel as in the pixel A. If not, there is no problem because the infrared camera 21 accurately captures the temperature of the heat receptor 14, but the pixels are partially occupied by the image of the heat receptor 14, such as the pixels in row A and row D. If so, the infrared camera 21 captures the temperature of the heat receptor 14 lower than the actual temperature.

  As shown in FIG. 7, when the longitudinal direction of the heat receptor 14 and one side of the pixel are parallel to each other, if n is less than 2, the image of the imaged heat receptor 14 occupies the entire pixel. In some cases, there is no pixel at all, and detection of the temperature distribution in the space may be inaccurate. Therefore, in order to accurately detect the temperature distribution, the diameter d of the image of the heat receptor 14 is preferably sufficiently larger than the length K of one side of the pixel, and at least n needs to be 2 or more. .

  In order to convert the diameter d of the heat receptor 14 on the imaging surface of the infrared camera 21 into the actual diameter D of the heat receptor 14, for example, a predetermined object at a predetermined distance from the infrared camera 21 is photographed in advance. Thus, a conversion table representing the relationship between the distance from the infrared camera 21 and the size of the object may be created and converted using this table.

  On the other hand, if the diameter of the heat receptor 14 is large, the ratio of the surface area to the volume of the heat receptor 14 is reduced, and the heat capacity of the heat receptor 14 is increased. Therefore, the response of the heat receptor 14 to the temperature change of the space. Decreases. In addition, the larger the diameter of the heat receptor 14, the more the heat receptor 14 hinders the airflow in the space, and the original temperature distribution in the space cannot be measured. Therefore, it is desirable that the diameter of the heat receptor 14 is small from the viewpoint of ensuring responsiveness and measuring the original temperature distribution of the space.

  As described above, n is preferably set to 2 or more in consideration of detection accuracy and responsiveness to a temperature change. FIG. 7 shows a case where n is 2. That is, when the diameter of the heat receptor 14 is twice the length of one side of one pixel, when the longitudinal direction of the heat receptor 14 and one side of the pixel are in a parallel relationship as shown in FIG. Since there is always a pixel that the heat receptor 14 occupies as a whole pixel, such as a row of pixels, the temperature distribution in the space can be detected sufficiently accurately. When a highly elastic material such as silicon rubber is used for the heat receptor 14, when the heat receptor 14 expands and the actual diameter D of the heat receptor 14 becomes the smallest, n is equal to or greater than a predetermined value. Then, the diameter of the heat receptor 14 is determined.

  If n is √5 or more, a pixel occupying all one pixel is always present regardless of the positional relationship between the longitudinal direction of the heat receptor 14 and the direction of one side of the pixel. The accuracy of temperature distribution detection can be increased.

  INDUSTRIAL APPLICABILITY The present invention can be used as a temperature distribution detection system that detects a temperature distribution in a space based on an image captured by an infrared camera and a detection body used in the detection system.

DESCRIPTION OF SYMBOLS 10 ... Temperature distribution detection system detection body 11 ... Moving body 12 ... Guide rail 13 ... Connection part 14 ... Heat receiving body 15 ... Elastic body 16 ... Winding part 20 ... Camera system 21 ... Infrared camera 22 ... Display apparatus 30 ... Temperature Distribution detection system 41 ... moving body connecting portion 42 ... heat receptor connecting portion 43 ... winding portion connecting portion

Claims (5)

A guide rail that holds the movable body freely,
A connecting part that connects the guide rails to form a closed frame together with the guide rails, and sets a predetermined angle between the guide rails connected to both sides of the guide rails;
A string-like heat receptor that is connected to the moving bodies at different ends and emits infrared rays according to temperature,
A detector for a temperature distribution detection system, comprising:   2. The temperature distribution detection system detector according to claim 1, wherein the heat receptor is silicon rubber containing carbon.   The temperature distribution detection system detection body according to claim 1, wherein the heat receptor is stretched over the moving body via an elastic body.   The heat receiving body is retractably accommodated in a winding portion connected to the moving body, and is drawn out from the winding portion and connected to the moving body. 4. The temperature distribution detection system detection body according to any one of 3 above. A camera system equipped with an infrared camera capable of photographing infrared rays, and a detector used to simplify photographing with the infrared camera,
The detection body includes a guide rail that holds the movable body movably, and
A connecting part that connects the guide rails to form a closed frame together with the guide rails, and sets a predetermined angle between the guide rails connected to both sides of the guide rails;
Both ends are connected to different moving bodies, arranged in a space in which a temperature distribution is to be detected, and a string-like heat receptor that emits infrared rays according to temperature,
The temperature distribution detection system, wherein the camera system is capable of photographing the heat receptor with the infrared camera.

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