Portable thermal radiation measuring device and thermal diagnostic method

Abstract

To provide a portable heat radiation measuring device and a heat diagnosis method having increased accuracy.SOLUTION: A portable heat radiation measuring device including a cylindrical roller surface part 20 provided rotatably around a rotating shaft 10, and a heat radiation sensor 50 for measuring heat radiation from an inner surface of the roller surface part is used. A heat diagnosis method includes: a first heat conduction process of bringing an outer surface 41 of a first part 21 of a roller surface part into contact with a first part of a target surface, and performing heat conduction of the first part of the roller surface part and the first part of the target surface; a first measurement process of measuring heat radiation from an inner surface of the first part of the roller surface part by the heat radiation sensor; a second heat conduction process of rotating the roller surface part around the rotating shaft, bringing an outer surface 42 of a second part 22 adjacent to the first part of the roller surface part into contact with a second part adjacent to a first part of a target surface, and performing heat conduction of the second part of the roller surface part and the second part of the target surface; and a second measurement process of measuring heat radiation from an inner surface of the second part of the roller surface part by a heat radiation sensor.SELECTED DRAWING: Figure 4B

Description

[Technical Field]

[0001] The present invention relates to a portable thermal radiation measuring device and a thermal diagnostic method. [Background technology]

[0002] Patent Document 1 describes a piping diagnostic method that includes the steps of: applying periodic temperature changes to a fluid flowing through a piping; measuring the temperature of the piping surface at a location through which the temperature-changed fluid passes using a thermograph or the like; and estimating the location of an abnormality in the piping from the temperature change on the piping surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 105142 Summary of the Invention [Problem to be solved by the invention]

[0004] However, for example, when the reflectivity of the pipe surface to be subjected to thermal diagnosis is high (i.e., when the emissivity of the pipe surface is low), the thermal radiation from the pipe surface includes not only thermal radiation originating from the temperature of the pipe surface itself, but also thermal radiation generated when thermal radiation from the atmosphere surrounding the pipe and other equipment is reflected by the pipe surface, making it impossible to perform accurate thermal diagnosis using conventional methods.

[0005] The present invention has been made in view of the above-mentioned problems, and one of its objects is to provide a portable thermal radiation measuring device and a thermal diagnostic method with improved accuracy. [Means for solving the problem]

[0006] A thermal diagnostic method according to one embodiment of the present invention for solving the above-mentioned problems is a thermal diagnostic method for a target surface using a portable thermal radiation measurement device including a rotation axis, a cylindrical roller surface portion rotatable around the rotation axis, and a thermal radiation sensor that measures thermal radiation from the inner surface of the roller surface portion, the method including: a first heat conduction step of bringing the outer surface of a first portion of the roller surface portion into contact with a first portion of the target surface to effect thermal conduction between the first portion of the roller surface portion and the first portion of the target surface; a first measurement step of measuring, with the thermal radiation sensor, thermal radiation from the inner surface of the first portion of the roller surface portion that is in contact with the first portion of the target surface; a second heat conduction step of rotating the roller surface portion around the rotation axis to bring the outer surface of a second portion of the roller surface portion adjacent to the first portion of the target surface into contact with a second portion of the target surface that is adjacent to the first portion of the target surface to effect thermal conduction between the second portion of the roller surface portion and the second portion of the target surface; and a second measurement step of measuring, with the thermal radiation sensor, thermal radiation from the inner surface of the second portion of the roller surface portion that is in contact with the second portion of the target surface. The present invention provides a thermal diagnostic method with improved accuracy.

[0007] In the thermal diagnostic method, the roller surface of the device may be made of a flexible sheet. Also, in the thermal diagnostic method, the target surface may include a metal. Also, in the thermal diagnostic method, the target surface may be the outer surface of a container containing a fluid therein.

[0008] According to one embodiment of the present invention, a portable thermal radiation measuring device for solving the above problem includes a rotation shaft, a cylindrical roller surface portion rotatable around the rotation shaft, and a thermal radiation sensor for measuring thermal radiation from the inner surface of the roller surface portion.

[0009] In the portable thermal radiation measuring device, the roller surface portion may be made of a flexible sheet. [Effects of the Invention]

[0010] The present invention provides a portable thermal radiation measurement device and thermal diagnostic method with improved accuracy. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an explanatory diagram schematically illustrating the exterior of an example of a portable thermal radiation measuring device according to an embodiment of the present invention, as viewed from the side; [Figure 2] 2 is an explanatory diagram schematically illustrating a cross section of the portable thermal radiation measuring device taken along line II-II in FIG. 1. FIG. [Figure 3] 1 is a cross-sectional view illustrating an example of a state in which a thermal diagnosis of a surface to be diagnosed is performed using a portable thermal radiation measuring device according to an embodiment of the present invention; [Figure 4A] 1 is an explanatory diagram illustrating a part of the steps included in a thermal diagnostic method using a portable thermal radiation measuring device according to an embodiment of the present invention. [Figure 4B] FIG. 10 is an explanatory diagram schematically illustrating another part of the steps included in the thermal diagnostic method using the portable thermal radiation measuring device according to one embodiment of the present invention. [Figure 4C] FIG. 10 is an explanatory diagram schematically illustrating still another part of the steps included in the thermal diagnostic method using the portable thermal radiation measuring device according to one embodiment of the present invention. [Figure 5] FIG. 10 is an explanatory diagram schematically illustrating the exterior of another example of a portable thermal radiation measuring device according to an embodiment of the present invention, as viewed from the side. [Figure 6] FIG. 2 is an explanatory diagram showing an example of the results of a thermal diagnosis of a curved target surface using a portable thermal radiation measuring device in Example 1 according to one embodiment of the present invention. [Figure 7] FIG. 10 is an explanatory diagram showing another example of the results of a thermal diagnosis of a curved target surface performed using the portable thermal radiation measuring device in Example 1 according to one embodiment of the present invention. [Figure 8] FIG. 10 is an explanatory diagram showing an example of the results of a thermal diagnosis of a flat target surface using a portable thermal radiation measuring device in Example 2 according to one embodiment of the present invention. [Figure 9]FIG. 10 is an explanatory diagram showing another example of the results of thermal diagnosis of a flat target surface using the portable thermal radiation measuring device in Example 2 according to one embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory diagram showing an example of the results of a thermal diagnosis of a curved target surface using a portable thermal radiation measuring device in Example 3 according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] A portable thermal radiation measuring device (hereinafter referred to as "the device") and a thermal diagnostic method (hereinafter referred to as "the method") according to one embodiment of the present invention will be described below. Note that the present invention is not limited to this embodiment.

[0013] FIG. 1 shows a schematic side view of the exterior of an example of this device. FIG. 2 shows a schematic cross-section of this device taken along line II-II in FIG. 1. FIG. 3 shows a schematic cross-sectional view of an example of how this device is used to perform thermal diagnosis of a target surface. FIGS. 4A to 4C show schematic views of some of the steps involved in a thermal diagnosis method using this device. FIG. 5 shows a schematic side view of the exterior of another example of this device. The cross-sectional view of this device shown in FIG. 5 is similar to that shown in FIGS. 2 and 3.

[0014] The device 1 is a portable thermal radiation measurement device that includes a rotating shaft 10, a cylindrical roller surface portion 20 that is rotatable around the rotating shaft 10, and a thermal radiation sensor 50 that measures thermal radiation from the inner surface 30 of the roller surface portion 20.

[0015] This method is a thermal diagnostic method for a target surface 120 using a portable thermal radiation measurement device including a rotation axis 10, a cylindrical roller surface portion 20 rotatably provided around the rotation axis 10, and a thermal radiation sensor 50 for measuring thermal radiation from an inner surface 30 of the roller surface portion 20, and includes a first heat conduction step of bringing an outer surface 41 of a first portion 21 of the roller surface portion 20 into contact with a first portion 121 of the target surface 120 to conduct heat between the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120; The method includes a first measuring step of measuring thermal radiation from the inner surface 32 of the second portion 22 of the roller surface portion 20 that is in contact with the second portion 122 of the target surface 120 that is in contact with the first portion 121 of the target surface 120 using the thermal radiation sensor 50; a second heat conduction step of rotating the roller surface portion 20 around the rotation axis 10 to bring the outer surface 42 of the second portion 22 adjacent to the first portion 21 of the roller surface portion 20 into contact with the second portion 122 of the target surface 120, thereby conducting heat between the second portion 22 of the roller surface portion 20 and the second portion 122 of the target surface 120; and a second measuring step of measuring thermal radiation from the inner surface 32 of the second portion 22 of the roller surface portion 20 that is in contact with the second portion 122 of the target surface 120 using the thermal radiation sensor 50.

[0016] As described above, the device 1 includes the rotating shaft 10, the roller surface unit 20, and the thermal radiation sensor 50. The roller surface unit 20 is a cylindrical body that is rotatable around the rotating shaft 10. The method for rotatably mounting the roller surface unit 20 around the rotating shaft 10 is not particularly limited as long as the effects of the present invention are obtained, but in this embodiment, the roller surface unit 20 is supported by a pair of wheel units 60 that are rotatably mounted on the rotating shaft 10. In other words, the roller surface unit 20 is rotatably mounted around the rotating shaft 10 via the wheel units 60.

[0017] Specifically, the roller surface portion 20 is supported on an outer peripheral surface 61 of the wheel portion 60. More specifically, one and the other of the pair of wheel portions 60 are spaced apart from each other in the longitudinal direction of the rotating shaft 10, and the roller surface portion 20 is provided across from the outer peripheral surface 61 of one of the pair of wheel portions 60 to the outer peripheral surface 61 of the other of the pair of wheel portions 60 in the longitudinal direction of the rotating shaft 10 (FIG. 2).

[0018] The pair of wheel units 60 may include a fixing portion (not shown) that fixes the relative positions of one and the other of the pair of wheel units 60. This fixing portion is not particularly limited as long as the effects of the present invention are obtained, but may be, for example, one or more pillar-shaped bodies extending from one of the pair of wheel units 60 to the other. Specifically, in this case, one end and the other end of each pillar-shaped body are fixed to one and the other of the pair of wheel units 60, respectively. As a result, the relative positions of one and the other of the pair of wheels 60 are fixed.

[0019] The shape of the wheel unit 60 is not particularly limited as long as the effects of the present invention can be obtained, but it is preferably a plate-like body or a frame-like body, for example. In the examples shown in Figures 1 to 5, the wheel unit 60 is a plate-like body.

[0020] The shape of the wheel unit 60 in side view is not particularly limited as long as the effects of the present invention are obtained, but is preferably, for example, circular or polygonal. The polygon is not particularly limited as long as the effects of the present invention are obtained, but is preferably, for example, a triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, decagon, decagonal ...

[0021] The material constituting the wheel portion 60 is not particularly limited as long as it can obtain the effects of the present invention, but is preferably one or more selected from the group consisting of metal, resin, ceramics, and wood, for example.

[0022] The rotating shaft 10 rotatably supports the roller surface portion 20. Specifically, in this embodiment, the rotating shaft 10 rotatably supports the pair of wheel units 60 as described above, thereby rotatably supporting the roller surface portion 20 via the wheel units 60.

[0023] One end 11 and / or the other end 12 of the rotating shaft 10 may be a free end that passes through one and / or the other of the pair of wheel units 60 and protrudes outward from the wheel units 60. In the example shown in Figures 2 and 3, the one end 11 and the other end 12 of the rotating shaft 10 are free ends that protrude outward from the pair of wheel units 60. The one end 11 and / or the other end 12 of the rotating shaft 10 that protrude outward from the wheel units 10 may be used as a handle for a user of the device 1 to grip.

[0024] Meanwhile, the central portion 13 in the longitudinal direction of the rotating shaft 10 is disposed in an internal space 70 of the device 1 surrounded by the roller surface portion 20 (FIG. 2). More specifically, this internal space 70 is a space surrounded by the pair of wheel units 60 and the roller surface portion 20.

[0025] The material constituting the rotating shaft 10 is not particularly limited as long as it can obtain the effects of the present invention, but is preferably one or more selected from the group consisting of metal, resin, and ceramic, for example.

[0026] The roller surface portion 20 is provided so as to cover all or part of the entire circumference in the circumferential direction of the device 1 (for example, the circumferential direction of the wheel portion 60). Specifically, the roller surface portion 20 may cover 50% or more (50% or more, 100% or less) of the entire circumference of the device 1, preferably 60% or more, more preferably 70% or more, even more preferably 80% or more, and particularly preferably 90% or more. In the example shown in Figures 1 to 5, the roller surface portion 20 is provided so as to cover the entire circumference of the device 1.

[0027] The shape of the roller surface portion 20 in side view is not particularly limited as long as the effects of the present invention are obtained, but is preferably, for example, circular or polygonal. The polygon is not particularly limited as long as the effects of the present invention are obtained, but is preferably, for example, a triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, decagon, decagonal, or dodecagonal, and is particularly preferably an equilateral triangle, square, regular pentagon, regular hexagon, regular heptagon, regular octagon, regular nonagon, regular decagon, regular dodecagon, or regular dodecagon. In the example shown in Figures 1 to 4, the shape of the roller surface portion 20 in side view is a regular hexagon. In the example shown in Figure 5, the shape of the roller surface portion 20 in side view is circular.

[0028] When the roller surface portion 20 is supported by a pair of wheel portions 60, the shape of the roller surface portion 20 in a side view may match the shape of the pair of wheel portions 60 in a side view. In the example shown in Figures 1 to 5, the shape of the roller surface portion 20 in a side view matches the shape of the pair of wheel portions 60 in a side view.

[0029] When the shape of the roller surface section 20 in side view is polygonal, the roller surface section 20 includes portions corresponding to all or some of the sides of the polygon. Specifically, in the example shown in Figures 1 to 4, the roller surface section 20 having a hexagonal shape in side view includes a first portion 21, a second portion 22, a third portion 23, a fourth portion 24, a fifth portion 25, and a sixth portion 26, which correspond to all of the sides of the hexagon.

[0030] Furthermore, roller surface portion 20, which has a polygonal shape in side view, includes inner surfaces 30 and outer surfaces 40 corresponding to all or some of the sides of the polygon. Specifically, in the example shown in Figures 1 to 4, inner surface 30 of roller surface portion 20 includes inner surfaces 31 of first portion 21, inner surfaces 32 of second portion 22, inner surfaces 33 of third portion 23, inner surfaces 34 of fourth portion 24, inner surfaces 35 of fifth portion 25, and inner surfaces 36 of sixth portion 26, corresponding to all of the sides of the hexagon. Similarly, outer surface 40 of roller surface portion 20 includes outer surface 41 of first portion 21, outer surface 42 of second portion 22, outer surface 43 of third portion 23, outer surface 44 of fourth portion 24, outer surface 45 of fifth portion 25, and outer surface 46 of sixth portion 26.

[0031] The material constituting the roller surface portion 20 is not particularly limited as long as the effects of the present invention are obtained, but it is preferable that the roller surface portion 20 be made of a flexible sheet. A roller surface portion 20 made of a flexible sheet has the flexibility to deform according to the shape of the target surface 120. In other words, a roller surface portion 20 made of a flexible sheet has the ability to follow the target surface 120.

[0032] The material constituting the flexible sheet is not particularly limited as long as it has flexibility to conform to the target surface 120, and any one or more materials such as organic materials and metallic materials can be used. The flexible sheet may be a non-porous sheet or a porous sheet. The non-porous sheet may be, for example, a resin sheet or a metal sheet (e.g., a metal film or metal foil). The porous sheet may be, for example, a resin sheet or a fiber sheet. The fiber sheet is not particularly limited as long as it contains organic fibers, inorganic fibers, or metal fibers and has flexibility.

[0033] The flexible sheet is preferably a stretchable sheet. The roller surface portion 20 made of a stretchable sheet can be deformed to follow the target surface 120, and then can be released from the target surface 120 to restore its original shape.

[0034] The stretchable sheet is not particularly limited as long as the effects of the present invention can be obtained, but is preferably, for example, an elastomer sheet. That is, in this case, the stretchable sheet is made of an elastomer. The elastomer constituting the stretchable sheet is not particularly limited as long as the effects of the present invention can be obtained, but is preferably, for example, one or more selected from the group consisting of ethylene propylene rubber elastomers, styrene butadiene rubber elastomers, nitrile rubber elastomers, butyl rubber elastomers, chloroprene rubber elastomers, silicone rubber elastomers, urethane rubber elastomers, fluororubber elastomers, and natural rubber elastomers.

[0035] The stretchable sheet may be non-porous (e.g., a non-porous elastomeric sheet) or porous (e.g., a porous elastomeric sheet). A porous stretchable sheet may be, for example, an elastomeric foam sheet or a woven or nonwoven fabric of elastomeric fibers.

[0036] The flexibility of the flexible sheet is not particularly limited as long as the effects of the present invention are obtained, but the Young's modulus (longitudinal elastic modulus) of the flexible sheet may be, for example, 1000 MPa or less, preferably 500 MPa or less, more preferably 200 MPa or less, and particularly preferably 100 MPa or less.

[0037] When the flexible sheet is a stretchable sheet, the Young's modulus of the stretchable sheet may be, for example, 100 MPa or less, preferably 50 MPa or less, more preferably 20 MPa or less, even more preferably 10 MPa or less, even more preferably 5 MPa or less, and particularly preferably 1 MPa or less.

[0038] The Young's modulus of the flexible sheet may be, for example, 0.001 MPa or more, preferably 0.01 MPa or more, and particularly preferably 0.1 MPa or more. A flexible sheet having a Young's modulus equal to or greater than the above-mentioned lower limit has appropriate strength. The Young's modulus of the flexible sheet may be specified by any combination of any of the above-mentioned lower limit values ​​and any of the above-mentioned upper limit values. The Young's modulus is measured by a method appropriate for the material constituting the flexible sheet, for example, a method conforming to JIS K7161 Plastics - Determination of Tensile Properties, JIS K6250 Rubber - General Rules for Physical Testing Methods, or JIS K6251 Vulcanized and Thermoplastic Rubber - Determination of Tensile Properties.

[0039] The thickness of the roller surface portion 20 (specifically, for example, the thickness of the flexible sheet that constitutes the roller surface portion 20) is not particularly limited as long as the effects of the present invention are obtained, but may be, for example, 3.0 mm or less, preferably 2.0 mm or less, more preferably 1.0 mm or less, even more preferably 0.5 mm or less, even more preferably 0.3 mm or less, and particularly preferably 0.1 mm or less. By having the thickness of the roller surface portion 20 be equal to or less than the above upper limit, the heat capacity of the roller surface portion 20 is effectively reduced, and heat conduction to the roller surface portion 20 is made more efficient.

[0040] Furthermore, the thickness of the roller surface portion 20 is, for example, preferably 0.01 mm or more, more preferably 0.03 mm or more, and particularly preferably 0.05 mm or more. By making the thickness of the roller surface portion 20 equal to or greater than the above-mentioned lower limit, the strength of the roller surface portion 20 is effectively ensured. The thickness of the roller surface portion 20 may be specified by any combination of any of the above-mentioned lower limit values ​​and any of the above-mentioned upper limit values.

[0041] The emissivity of the inner surface 30 of the roller surface portion 20 is not particularly limited as long as the effects of the present invention are obtained, but for example, it is preferably 0.8 or higher, more preferably 0.85 or higher, and particularly preferably 0.9 or higher. The inner surface 30 of the roller surface portion 20 having an emissivity equal to or lower than the above-mentioned upper limit will effectively radiate heat. The emissivity is measured by a method conforming to the simplified method for measuring emissivity using an infrared radiation thermometer specified in JISA1423.

[0042] The method for increasing the emissivity of the inner surface 30 of the roller surface portion 20 is not particularly limited as long as the effects of the present invention are obtained, but for example, the use of paint that increases the emissivity (for example, black paint such as black body paint) (for example, applying paint to the inner surface 30 of the roller surface portion 20 or attaching a film containing paint, and / or adding paint to the material that constitutes the roller surface portion 20) is preferably used.

[0043] The thermal conductivity of the roller surface portion 20 is not particularly limited as long as the effects of the present invention are obtained, but for example, the thermal conductivity of the roller surface portion 20 at 20°C is preferably 0.1 W / (m·K) or more, more preferably 1.0 W / (m·K) or more, and particularly preferably 10.0 W / (m·K) or more. The thermal conductivity is measured using a method in accordance with "JIS A 1412-1:2016 Measurement method for thermal resistance and thermal conductivity of thermal insulating materials - Part 1: Guarded hot plate method (GHP method)."

[0044] The device 1 includes a thermal radiation sensor 50 that measures thermal radiation from the inner surface 30 of the roller surface portion 20. The thermal radiation sensor 50 is not particularly limited as long as it can achieve the effects of the present invention, but is preferably, for example, an infrared sensor. The infrared sensor preferably includes an infrared camera. Furthermore, the thermal radiation sensor 50 preferably includes a thermography camera (e.g., an infrared thermography camera).

[0045] The placement of the thermal radiation sensor 50 in the device 1 is not particularly limited as long as the effects of the present invention can be obtained, but it is preferable that the thermal radiation sensor 50 be placed in the internal space 70 surrounded by the roller surface portion 20. Furthermore, it is preferable that the thermal radiation sensor 50 be held in a position facing the target surface 120 via the roller surface portion 20 while the roller surface portion 20 moves over the target surface 120 while rotating around the rotation axis 10, as described below.

[0046] Specifically, the thermal radiation sensor 50 may be fixed to, for example, the rotating shaft 10. The thermal radiation sensor 50 may be fixed to the rotating shaft 10 directly or indirectly via another member.

[0047] 1 to 5, the thermal radiation sensor 50 is fixed to the rotating shaft 10 (specifically, the central portion 13 of the rotating shaft 10) in the internal space 70 of the device 1. As a result, as shown in FIGS. 4A to 4C, the thermal radiation sensor 50 is held in a position facing the target surface 120 via the roller surface portion 20 while the roller surface portion 20 moves over the target surface 120 while rotating around the rotating shaft 10. However, as described above, the arrangement of the thermal radiation sensor 50 is not limited to the example shown in FIGS. 1 to 5 as long as the effects of the present invention can be obtained.

[0048] The device 1 is portable. That is, the device 1 is configured to be movable among a plurality of target surfaces 120 spaced apart from one another. Specifically, the device 1 is configured to be movable from a first target surface 120 (e.g., the outer surface of a first pipe) to a second target surface 120 spaced apart from the first target surface 120, for use in measuring the thermal radiation of the second target surface 120 (e.g., the outer surface of a second pipe spaced apart from the first pipe). The device 1 may be a portable device that can be carried by a user.

[0049] In this method, the device 1 is used to perform thermal diagnosis of the target surface 120. The target surface 120 is not particularly limited as long as it is a surface that is the target of thermal diagnosis, but a preferred example is the outer surface of a container (e.g., a container through which a fluid flows and / or a container that stores a fluid) that contains a fluid (e.g., a heated or cooled fluid) therein. The container that contains a fluid therein is not particularly limited as long as the effects of the present invention can be obtained, but it may be, for example, a pipe or a tank. Furthermore, the outer surface of a container that contains a fluid therein may be, for example, the outer surface of the container itself, the outer surface of an insulating material (heat-insulating material or cold-insulating material) that covers the outer surface of the container itself, or the outer surface of an exterior material (e.g., an exterior plate) that covers the outer surface of the container itself or the outer surface of the insulating material.

[0050] In the examples shown in Figures 3 and 4 (Figures 4A to 4C), the target surface 120 is the outer surface (outer surface of the cylindrical body 110) of a pipe 100 consisting of a cylindrical body 110 through whose internal space 130 a fluid (liquid or gas) flows.

[0051] The shape of target surface 120 is not particularly limited as long as the effects of the present invention can be obtained, and may be, for example, a curved surface (for example, a cylindrical outer surface such as the outer surface of pipe 100) or a flat surface. In the example shown in Figures 3 and 4, target surface 120 is the curved outer surface of pipe 100.

[0052] The length of the target surface 120 is not particularly limited as long as the effect of the present invention is obtained, but for example, it may be longer than the overall circumferential length of the roller surface portion 20 of the device 1 (the overall circumferential length of the outer surface 40 of the roller surface portion 20), or it may be at least two, three, four, or five times the overall circumferential length of the roller surface portion 20.

[0053] The temperature of the target surface 120 is not particularly limited as long as the effects of the present invention are obtained, and may be, for example, higher than the temperature (e.g., room temperature) of the space (e.g., atmosphere) in which the target surface 120 is held, or may be lower than that temperature.

[0054] In the examples shown in Figures 3 and 4, the temperature of the target surface 120, which is the outer surface of the pipe 100, may be a temperature corresponding to the temperature of the fluid flowing through the internal space 130 of the pipe 100, or may be a temperature that has been pre-adjusted by heating or cooling.

[0055] The emissivity of the target surface 120 is not particularly limited as long as the effects of the present invention are obtained, but may be, for example, 0.60 or less, 0.50 or less, 0.40 or less, 0.30 or less, 0.20 or less, or 0.10 or less. The lower the emissivity of the target surface 120, the greater the significance of the present invention. The emissivity is measured by a method conforming to the simplified method for measuring emissivity using an infrared thermometer specified in JISA1423.

[0056] The material constituting the target surface 120 is not particularly limited as long as the effects of the present invention can be obtained. However, for example, the target surface 120 preferably contains a metal. Specifically, the target surface 120 may be, for example, a metal surface (e.g., the metal surface of a metal container itself, or the surface of a metal film (e.g., metal foil) covering a non-metallic surface such as resin), the surface of a paint containing metal powder (e.g., the surface of a metal-containing paint applied to a metal surface or a non-metallic surface), or the surface of a film containing metal powder (e.g., the surface of a metal-containing film covering a metal surface or a non-metallic surface). In the example shown in FIGS. 3 and 4, the target surface 120 is the metallic outer surface of the pipe 100. Because metals generally have low emissivity, the present invention is particularly significant when the target surface 120 is made of metal (especially when the target surface 120 is unpainted and has a metallic luster).

[0057] In this method, first, in a first heat conduction step, outer surface 41 of first portion 21 of roller surface portion 20 of this device 1 is brought into contact with first portion 121 of target surface 120 to effect heat conduction between said first portion 21 of roller surface portion 20 and said first portion 121 of target surface 120 (FIG. 4A). That is, heat conduction is effected by pressing and holding outer surface 41 of first portion 21 of roller surface portion 20 against first portion 121 of target surface 120.

[0058] Specifically, when the shape of the roller surface portion 20 in a side view is polygonal, the outer surface 41 of the first portion 21 corresponding to one side of the polygon of the roller surface portion 20 is brought into contact with the first portion 121 of the target surface 120.

[0059] Also, as shown in Figure 5, when the shape of the roller surface portion 20 is circular when viewed from the side, the outer surface 41 of the first portion 21 corresponding to a part of the circumference of the roller surface portion 20 is brought into contact with the first portion 121 of the target surface 120.

[0060] On the other hand, the first portion 121 of the target surface 120 that is to come into contact with the first portion 21 of the roller surface portion 20 is not particularly limited as long as it is a part of the target surface 120. In the example shown in Figures 3 and 4, the first portion 121, which is a part in the longitudinal direction of the target surface 120 that is the outer surface of the pipe 100, is brought into contact with the first portion 21 of the roller surface portion 20 (Figure 4A).

[0061] When the roller surface portion 20 is made of a flexible sheet, heat conduction between the roller surface portion 20 and the target surface 120 can be effectively achieved. That is, for example, if the target surface 120 is a curved surface or has undulations, pressing the roller surface portion 20 made of a flexible sheet against the target surface 120 causes the roller surface portion 20 to deform along the curved shape or undulations of the target surface 120 (i.e., the roller surface portion 20 follows the shape of the target surface 120), thereby achieving effective contact between the roller surface portion 20 and the target surface 120. Furthermore, pressing the roller surface portion 20 made of a flexible sheet against the target surface 120 reduces the thickness of all or part of the roller surface portion 20, thereby reducing the heat capacity of the roller surface portion 20. As a result, heat conduction between the roller surface portion 20 made of a flexible sheet and the target surface 120 can be efficiently achieved.

[0062] Heat conduction due to contact between the outer surface 41 of the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120 continues until the temperature of the inner surface 31 of the first portion 21 of the roller surface portion 20 converges to a temperature corresponding to the temperature of the first portion 121 of the target surface 120.

[0063] Here, the convergence temperature of the inner surface 30 of the part of the roller surface portion 20 that is in contact with a part of the target surface 120 is preferably the same as the temperature of that part of the target surface 120, but may be a different temperature from the temperature of that part of the target surface 120 as long as it is a temperature that has converged due to thermal conduction. Note that if the amount of change in the temperature of the inner surface 30 of the roller surface portion 20 measured by the thermal radiation sensor 50 within a predetermined time period is less than a predetermined value (for example, a temperature where the temperature change over 5 seconds is 0.1°C or less), the temperature of the inner surface 30 is determined to have converged. Furthermore, the difference between the convergence temperature of the inner surface 30 of the roller surface portion 20 and the temperature of the target surface 120 can be confirmed, for example, by a prior measurement.

[0064] Next, in the first measurement step, the thermal radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20 in contact with the first portion 121 of the target surface 120 is measured by the thermal radiation sensor 50 (FIG. 4A).

[0065] That is, the thermal radiation sensor 50 measures the thermal radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20, whose temperature has reached a convergence temperature corresponding to the temperature of the first portion 121 of the target surface 120 due to the above-mentioned thermal conduction.

[0066] Furthermore, the thermal radiation measurement in the first measurement step may be performed in parallel with the first heat conduction step. That is, for example, the thermal radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20 may be measured over time by the thermal radiation sensor 50, before the temperature of the first portion 21 of the roller surface portion 20 converges (for example, after contact (thermal conduction) between the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120 begins).

[0067] If the thermal radiation sensor 50 includes a thermographic camera (for example, an infrared thermographic camera), it can acquire a thermographic image of the inner surface 30 of the roller surface portion 20. In this case, the thermal radiation sensor 50 may display the thermographic image on a display device (for example, a liquid crystal display device) installed outside the device 1, either wired or wirelessly.

[0068] Furthermore, in the present device 1, the thermal radiation sensor 50 is disposed at a position appropriate for measuring thermal radiation from the inner surface 30 of the roller surface portion 20. Specifically, for example, the thermal radiation sensor 50 is disposed so as to face the inner surface 30 of a portion of the roller surface portion 20 that is in contact with a portion of the target surface 120. In other words, the thermal radiation sensor 50 is disposed so as to face the target surface 120 across the roller surface portion 20.

[0069] Specifically, the thermal radiation sensor 50 is held facing the target surface 120 via the roller surface portion 20 so as to continuously measure thermal radiation from the inner surface 30 of the portion of the roller surface portion 20 that is in contact with the target surface 120 while the roller surface portion 20 rotates around the rotation axis 10 and moves over the target surface 120.

[0070] Furthermore, in the second heat conduction process, the roller surface portion 20 is rotated around the rotation axis 10, so that the outer surface 42 of the second portion 22 adjacent to the first portion 21 of the roller surface portion 20 is brought into contact with the second portion 122 adjacent to the first portion 121 of the target surface 120, instead of the outer surface 41 of the first portion 21 of the roller surface portion 20, thereby conducting heat between the second portion 22 of the roller surface portion 20 and the second portion 122 of the target surface 120 (Figure 4B).

[0071] That is, from a state in which the outer surface 41 of the first portion 21 of the roller surface portion 20 of the device 1 is in contact with the first portion 121 of the target surface 120 (FIG. 4A), the roller surface portion 20 is rotated around the rotation axis 10 (i.e., the roller surface portion 20 is rolled on the target surface 120), whereby the outer surface 41 of the first portion 21 of the roller surface portion 20 is separated from the first portion 121 of the target surface 120 and the outer surface 42 of the second portion 22 of the roller surface portion 20 is brought into contact with the second portion 122 of the target surface 120. Then, the outer surface 42 of the second portion 22 of the roller surface portion 20 is pressed against and held against the second portion 122 of the target surface 120, thereby conducting heat.

[0072] Specifically, when the shape of the roller surface portion 20 in a side view is polygonal, by rotating the roller surface portion 20 around the rotation axis 10 on the target surface 120, instead of the outer surface 41 of the first portion 21 corresponding to one side of the polygon of the roller surface portion 20, the outer surface 42 of the second portion 22 of the roller surface portion 20 corresponding to the other side adjacent to the one side of the polygon of the roller surface portion 20 is brought into contact with the second portion 122 of the target surface 120.

[0073] Furthermore, as shown in Figure 5, when the shape of the roller surface portion 20 in side view is circular, by rotating the roller surface portion 20 around the rotation axis 10 on the target surface 120, instead of the outer surface 41 of the first portion 21 corresponding to a part of the circumference of the roller surface portion 20, the outer surface 42 of the second portion 22 of the roller surface portion 20, which corresponds to another part adjacent to the part of the circumference of the roller surface portion 20, is brought into contact with the second portion 122 of the target surface 120.

[0074] The second portion 22 of the circular roller surface portion 20 may not overlap with the first portion 21, but is not particularly limited as long as it includes a portion that is not included in the first portion 21, and a portion of the second portion 22 may overlap with a portion of the first portion 21.

[0075] On the other hand, the second portion 122 of the target surface 120 that is brought into contact with the second portion 22 of the roller surface portion 20 is a portion adjacent to the first portion 121 of the target surface 120. In the example shown in FIG. 4B , the second portion 122 that is adjacent to the first portion 121 in the longitudinal direction of the target surface 120, which is the outer surface of the pipe 100, is brought into contact with the second portion 22 of the roller surface portion 20.

[0076] The second portion 122 of the target surface 120 may not overlap with the first portion 121, but is not particularly limited as long as it includes a portion that is not included in the first portion 121, and a portion of the second portion 122 may overlap with a portion of the first portion 121.

[0077] Heat conduction due to contact between the outer surface 42 of the second portion 22 of the roller surface portion 20 and the second portion 122 of the target surface 120 continues until the temperature of the inner surface 32 of the second portion 22 of the roller surface portion 20 converges to a temperature corresponding to the temperature of the second portion 122 of the target surface 120.

[0078] Next, in the second measurement step, the thermal radiation from the inner surface 31 of the second portion 22 of the roller surface portion 20 that is in contact with the second portion 122 of the target surface 120 is measured by the thermal radiation sensor 50 (FIG. 4B).

[0079] That is, the thermal radiation sensor 50 measures the thermal radiation from the inner surface 32 of the second portion 22 of the roller surface portion 20, whose temperature has reached a convergence temperature corresponding to the temperature of the second portion 122 of the target surface 120 due to the above-mentioned thermal conduction.

[0080] Furthermore, the thermal radiation measurement in the second measurement step may be performed in parallel with the second heat conduction step. That is, for example, the thermal radiation from the inner surface 32 of the second portion 22 of the roller surface portion 20 may be measured over time by the thermal radiation sensor 50, starting before the temperature of the second portion 22 of the roller surface portion 20 converges (for example, after contact (thermal conduction) between the second portion 22 of the roller surface portion 20 and the second portion 122 of the target surface 120 begins).

[0081] In this method, a heat conduction step and a measurement step similar to the second heat conduction step and the second measurement step may be performed one or more times for one or more other portions of the roller surface portion 20 and one or more other portions of the target surface 120.

[0082] That is, for example, when the heat conduction process and the measurement process are performed for the third portion 23 of the roller surface portion 20 and the third portion 123 of the target surface 120, after the second measurement process, the roller surface portion 20 is further rotated around the rotation axis 10, so that the outer surface 43 of the third portion 23 adjacent to the second portion 22 of the roller surface portion 20 is brought into contact with the third portion 123 adjacent to the second portion 122 of the target surface 120, instead of the outer surface 42 of the second portion 22 of the roller surface portion 20, thereby performing a third heat conduction process in which heat is conducted between the third portion 23 of the roller surface portion 20 and the third portion 123 of the target surface 120, and a third heat conduction process in which heat radiation from the inner surface 33 of the third portion 23 of the roller surface portion 20, which is in contact with the third portion 123 of the target surface 120, is measured by a thermal radiation sensor 50 (Figure 4C).

[0083] In this method, the number of times the heat conduction process and the measurement process are repeated is not particularly limited as long as the effects of the present invention are obtained, but for example, if the length of the target surface 120 is longer than the length of the entire circumference of the roller surface portion 20, the heat conduction process and the measurement process may be performed until the roller surface portion 20 has rotated one or more times.

[0084] Specifically, for example, if the shape of the roller surface portion 20 in side view is polygonal, the heat conduction process and the measurement process may be performed one or more times for all of the parts corresponding to the sides of the polygon (for example, if the shape of the roller surface portion 20 in side view is hexagonal, as shown in Figures 1 and 4, all of the first part 21, second part 22, third part 23, fourth part 24, fifth part 25 and sixth part 26 corresponding to the sides of the hexagon).

[0085] Furthermore, if the length of the target surface 120 is two or more, three or more, four or more, or five or more times the length of the entire circumference of the roller surface portion 20, the heat conduction process and the measurement process may be performed until the roller surface portion 20 has rotated two or more, three or more, four or more, or five or more times, respectively.

[0086] In this method, a thermal diagnosis of the target surface 120 is performed based on the thermal radiation measurement results of the inner surface 30 of the roller surface portion 20 obtained as described above. That is, for example, the thermal radiation measurement results of the inner surface 30 of the roller surface portion 20 are compared with a predetermined standard to determine whether there is a problem with the target surface 120.

[0087] Specifically, for example, the temperature of the inner surface 30 of multiple parts of the roller surface portion 20 (for example, multiple parts including the first part 21 and the second part 22) is compared with a predetermined temperature range to determine whether the temperature of the inner surface 30 of all or part of the multiple parts of the roller surface portion 20 is within the predetermined temperature range, and based on the determination result, it is determined whether there is a problem with the target surface 120.

[0088] More specifically, for example, if the temperature of the target surface 120 should be maintained within a predetermined temperature range, the temperature of the inner surfaces 30 of the multiple parts of the roller surface portion 20 is compared with the predetermined temperature range, and if the temperature of the inner surfaces 30 of all of the multiple parts is within the predetermined temperature range, it is determined that there is no problem, and if the temperature of the inner surfaces 30 of all or some of the multiple parts is outside the predetermined temperature range, it is determined that there is a problem.

[0089] This method makes it possible to realize thermal diagnosis with improved accuracy compared to conventional methods. That is, this method measures the thermal radiation of the inner surface 30 of the roller surface portion 20 that has reached a temperature corresponding to the temperature of the target surface 120 due to thermal conduction caused by contact between the outer surface 40 of the roller surface portion 20 of the device 1 and the target surface 120. Therefore, even if the reflectance of the target surface 120 is high (the emissivity is low), it is possible to selectively measure only the thermal radiation corresponding to the temperature of the target surface 120, and accurately perform thermal diagnosis of the target surface 120.

[0090] In addition, in this method, by using a roller surface portion 20 that moves while rotating on the target surface 120, effective thermal diagnosis can be performed on a desired range of the target surface 120, even if the target surface 120 extends over a long distance, such as the outer surface of a pipe 100.

[0091] Furthermore, in this method, by using the portable device 1, effective thermal diagnosis can be performed on multiple target surfaces 120 installed at a distance from each other (for example, the outer surfaces of multiple pipes installed in different locations within the same facility, or the outer surfaces of multiple pipes in different facilities).

[0092] Next, a specific example according to this embodiment will be described. [Example]

[0093] The present device 1 was fabricated having a roller surface portion 20 that has a hexagonal shape in side view as shown in Fig. 1. Wooden plates were used as the pair of wheel portions 60. The relative positions of one and the other of the pair of wheel portions 60 were fixed by six metal rods that connected them at positions corresponding to the vertices of the hexagon (one end and the other end of each rod was connected to one and the other of the pair of wheel portions 60, respectively).

[0094] An elastomer sheet (thickness: 0.2 mm) made of EPDM (ethylene propylene diene rubber) was used as the roller surface portion 20. In order to increase the emissivity of the roller surface portion 20, a black paint was applied to the surface of the elastomer sheet.

[0095] A metal rod was used as the rotating shaft 10. One end 11 and the other end 12, which are the free ends of the rotating shaft 10, protruded outward from one and the other of the pair of wheel units 60, respectively. One end 11 and the other end 12 of the rotating shaft 10 protruding outward from the wheel units 60 were used as handles to be gripped by the user of the device 1.

[0096] An infrared sensor including an infrared thermography camera was used as the thermal radiation sensor 50. The infrared thermography camera was fixed to the rotation shaft 10 so as to face the target surface 120 via the roller surface portion 20 while the roller surface portion 20 moved over the target surface 120.

[0097] Then, using this device 1, a thermal diagnosis was performed on the target surface 120, which is the outer surface of a preheated metal pipe 100. That is, first, the outer surface 41 of the first portion 21 corresponding to one side of the hexagon of the roller surface portion 20 of this device 1 was brought into contact with the first portion 121 of the target surface 120, and thermal conduction was performed between the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120.

[0098] Specifically, by pressing the outer surface 41 of the first portion 21 of the roller surface portion 20 against the first portion 121 of the target surface 120, the first portion 21 of the roller surface portion 20 was stretched and adhered along the curved target surface 120 of the piping 100 (Figures 3 and 4A).

[0099] Furthermore, by holding the outer surface 41 of the first portion 21 of the roller surface portion 20 in a pressed state against the first portion 121 of the target surface 120, heat was conducted from the first portion 121 of the target surface 120 to the first portion 21 of the roller surface portion 20. Then, the heat radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20, which was in contact with the first portion 121 of the target surface 120, was measured by the thermal radiation sensor 50.

[0100] Figure 6 shows the results of measuring thermal radiation. In Figure 6, the horizontal axis represents the time (seconds) elapsed since contact between the outer surface 41 of the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120 began, and the vertical axis represents the measured temperature (°C) of the inner surface 31 of the first portion 21 of the roller surface portion 20, with n1 (solid line), n2 (dashed line), and n3 (dotted line) representing the results of three measurements. As shown in Figure 6, after approximately 180 seconds of contact (thermal conduction), the measured temperature of the inner surface 31 of the first portion 21 of the roller surface portion 20 converged to a substantially constant value.

[0101] 7 shows thermographic images of the inner surface 31 of the first portion 21 of the roller surface portion 20 taken 3 seconds, 15 seconds, and 180 seconds after the outer surface 41 of the first portion 21 of the roller surface portion 20 started to contact the first portion 121 of the target surface 120. As shown in FIG. 7, thermographic images were taken that show the temperature of the inner surface 31 of the first portion 21 of the roller surface portion 20 increasing with the passage of the contact (thermal conduction) time. [Example]

[0102] Using the device 1 used in Example 1 described above, a thermal diagnosis was carried out on the target surface 120, which was the surface of a preheated metal plate. That is, first, the outer surface 41 of the first portion 21 corresponding to one side of the hexagon of the roller surface portion 20 of the device 1 was brought into contact with the first portion 121 of the target surface 120, and thermal conduction was carried out between the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120.

[0103] Specifically, the outer surface 41 of the first portion 21 of the roller surface portion 20 was pressed against the first portion 121 of the target surface 120 so as to reduce the thickness of the first portion 21, thereby bringing the first portion 21 of the roller surface portion 20 into close contact with the target surface 120. Then, the thermal radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20, which was in contact with the first portion 121 of the target surface 120, was measured by the thermal radiation sensor 50.

[0104] Figure 8 shows the results of measuring thermal radiation. In Figure 8, the horizontal axis represents the time (seconds) elapsed since contact between the outer surface 41 of the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120 began, and the vertical axis represents the measured temperature (°C) of the inner surface 31 of the first portion 21 of the roller surface portion 20, with n1 (solid line), n2 (dashed line), and n3 (dotted line) representing the results of three measurements. As shown in Figure 8, after approximately 180 seconds of contact (thermal conduction), the measured temperature of the inner surface 31 of the first portion 21 of the roller surface portion 20 converged to a substantially constant value.

[0105] 9 shows thermographic images of the inner surface 31 of the first portion 21 of the roller surface portion 20, taken 3 seconds, 15 seconds, and 180 seconds after the outer surface 41 of the first portion 21 of the roller surface portion 20 started to contact the first portion 121 of the target surface 120. As shown in FIG. 9, thermographic images were taken that show the temperature of the inner surface 31 of the first portion 21 of the roller surface portion 20 increasing with the passage of the contact (thermal conduction) time. [Example]

[0106] Using the device 1 used in Example 1 described above, thermal diagnosis was performed on multiple portions in the longitudinal direction of the target surface 120, which is the outer surface of a preheated metal pipe 100. That is, first, the outer surface 41 of the first portion 21 corresponding to one side of the hexagon of the roller surface portion 20 of the device 1 was brought into contact with the first portion 121 of the target surface 120, and thermal conduction was performed between the first portion 21 of the roller surface portion 20 and the first portion 121 of the target surface 120 (FIG. 4A). Then, thermal radiation from the inner surface 31 of the first portion 21 of the roller surface portion 20, which was in contact with the first portion 121 of the target surface 120, was measured with the thermal radiation sensor 50.

[0107] Next, by rotating roller surface portion 20 around rotation axis 10 on target surface 120, first portion 21 of the roller surface portion was separated from first portion 121 of target surface 120, and outer surface 42 of second portion 22 adjacent to first portion 21 of roller surface portion 20 was brought into contact with second portion 122 adjacent to first portion 121 of target surface 120, thereby conducting heat between second portion 22 of roller surface portion 20 and second portion 122 of target surface 120 ( FIG. 4B ). Then, thermal radiation from inner surface 32 of second portion 22 of roller surface portion 20 in contact with second portion 122 of target surface 120 was measured by thermal radiation sensor 50.

[0108] Similarly, by further rotating the roller surface portion 20 around the rotation axis 10 on the target surface 120, thermal conduction was performed between the third portion 23 of the roller surface portion 20 and the third portion 123 of the target surface 120, and the thermal radiation from the inner surface 33 of the third portion 23 of the roller surface portion 20, which was in contact with the third portion 123 of the target surface 120, was measured by the thermal radiation sensor 50 (Figure 4C).

[0109] Similarly, by further rotating the roller surface portion 20 around the rotation axis 10 on the target surface 120, thermal conduction was carried out between the fourth portion 24 of the roller surface portion 20 and the fourth portion 124 of the target surface 120, and the thermal radiation from the inner surface 34 of the fourth portion 24 of the roller surface portion 20, which was in contact with the fourth portion 124 of the target surface 120, was measured by the thermal radiation sensor 50.

[0110] 10 shows thermography images of the inner surface 31 of the first portion 21, the inner surface 32 of the second portion 22, the inner surface 33 of the third portion 23, and the inner surface 34 of the fourth portion 24 of the roller surface portion 20. As shown in FIG. 10, by continuously measuring the heat radiation from the inner surface 30 of the roller surface portion 20 while rolling the roller surface portion 20 over the target surface 120, it was possible to effectively perform thermal diagnosis of the target surface 120, which is the outer surface of the pipe 100 extending long in the longitudinal direction.

Claims

1. A rotation axis; a cylindrical roller surface portion rotatable around the rotation axis; a thermal radiation sensor for measuring thermal radiation from the inner surface of the roller surface; A method for thermal diagnosis of a stationary target surface using a portable thermal radiation measurement device, comprising: a first heat conduction step of contacting an outer surface of a first portion of the roller surface portion with a first portion of the target surface to conduct heat between the first portion of the roller surface portion and the first portion of the target surface; a first measuring step of measuring, with the thermal radiation sensor, thermal radiation from an inner surface of the first portion of the roller surface portion that is in contact with the first portion of the target surface; a second heat conduction step of rotating the roller surface unit around the rotation axis to bring an outer surface of a second portion of the roller surface unit adjacent to the first portion into contact with a second portion of the target surface adjacent to the first portion, thereby conducting heat between the second portion of the roller surface unit and the second portion of the target surface; a second measuring step of measuring, with the thermal radiation sensor, thermal radiation from an inner surface of the second portion of the roller surface portion that is in contact with the second portion of the target surface; A thermal diagnostic method comprising:

2. The roller surface portion of the portable thermal radiation measuring device is made of a flexible sheet. The thermal diagnostic method of claim 1 .

3. the target surface comprises a metal; The thermal diagnostic method according to claim 1 or 2.

4. The target surface is an outer surface of a container containing a fluid therein. The thermal diagnostic method according to any one of claims 1 to 3.

5. the target surface is an outer surface of a pipe; In a second heat conduction step, the roller surface portion is rotated around the rotation axis, so that an outer surface of a second portion of the roller surface portion adjacent to the first portion in the longitudinal direction of the pipe is brought into contact with a second portion of the target surface adjacent to the first portion, thereby conducting heat between the second portion of the roller surface portion and the second portion of the target surface.

5. A thermal diagnostic method according to claim 1.

6. A rotation axis; a cylindrical roller surface portion rotatable around the rotation axis; a thermal radiation sensor for measuring thermal radiation from the inner surface of the roller surface; Including, A thermal diagnostic method according to any one of claims 1 to 5, Portable thermal radiation measuring device for thermal diagnostics.

7. The roller surface portion is made of a flexible sheet.

7. A portable thermal radiation measuring device for thermal diagnostics according to claim 6.

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