JP2017129502A - Strain sensor, monitoring system and method of manufacturing strain sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strain sensor capable of being inexpensively prepared with a simple structure and easily visually recognizing deformation of an object.SOLUTION: A strain sensor which is installed at an object and detects deformation of the object includes: a frame member which is installed at an object while including a first frame and a second frame connected to the first frame in a dividable manner; a sensor member having a first fixing part fixed to the first frame, a second fixing part fixed to the second frame, and a fracture part which is fractured when stress is applied by deformation of the object arranged between the first fixing part and the second fixing part; and a sensor film whose appearance changes when installed on the surface of the sensor member and the fracture part is fractured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a strain sensor, a monitoring system, and a method for manufacturing a strain sensor.

  For example, when an excessive load is applied to a plant piping facility or mechanical facility, the facility needs to be stopped for safety. In order to reuse equipment that may have been subjected to an excessive load, it is necessary to grasp the deformation or distortion generated in the equipment and evaluate the soundness (see Patent Document 1).

Japanese Patent No. 5192095

  Therefore, it is necessary to constantly monitor in order to determine whether an excessive load is applied to the equipment in operation, such as equipment cost, installation cost, inspection cost, equipment maintenance cost, equipment operating cost, and data processing cost. Expenses are incurred and a heavy burden In addition, it is not cost effective to constantly monitor the equipment in preparation for excessive loads due to earthquakes and accidents.

  Also, when monitoring the load of piping equipment, the load status varies depending on the route shape, piping specifications, support points, etc., so uniform evaluation is difficult, and in order to evaluate the soundness for each route Individual assessment is required.

  Moreover, when evaluating the soundness of piping equipment, since the load of piping itself is not measured conventionally, it evaluates based on the load data regarding installation places, such as a building and a ground. Therefore, it becomes soundness confirmation for every piping route regardless of the system configuration, and it is difficult to partially reuse the system for each system, so that the operation rate of the plant is remarkably deteriorated.

  Since the load on the pipe itself is not measured, detailed inspection and analysis evaluation are required for all the pipes, and the number of steps involved in confirming the soundness of the plant becomes enormous.

  As an inexpensive method for constantly monitoring the load on the facility, there is a method using a disconnection sensor. According to the disconnection sensor, when a load more than expected is applied, the sensor wire is broken, and it is possible to grasp the occurrence of a load greater than the expected value from the break of the sensor wire. However, complicated operations such as energization and reading with a magnifying glass are required for detecting breakage of the sensor line, and the application destination is limited.

  An object of the present invention is to provide a strain sensor, a monitoring system, and a method for manufacturing a strain sensor that can be produced at a low cost with a simple structure and can easily visually recognize deformation of an object such as plant equipment. To do.

  A first aspect of the present invention is a strain sensor that is installed on an object and detects deformation of the object, and includes a first frame and a second frame that is detachably connected to the first frame. A frame member installed on an object; a first fixing portion fixed to the first frame; a second fixing portion fixed to the second frame; and the first fixing portion and the second fixing portion. A sensor member having a rupture portion that is disposed between and ruptured when stress is applied by deformation of the object, and a sensor film that is provided on a surface of the sensor member and changes in appearance when the rupture portion is ruptured. A strain sensor is provided.

  According to the 1st aspect of this invention, since the frame member which can be divided | segmented is installed in a target object, when a target object deform | transforms, a 1st frame and a 2nd frame will be isolate | separated. When the first frame and the second frame are separated, the first fixing portion is fixed to the first frame, and the second fixing portion is fixed to the second frame. Corresponding stress is applied, and the fractured portion breaks. When the rupture portion breaks, the sensor film provided on the surface of the sensor member is distorted and the appearance of the sensor film changes. Therefore, if the appearance of the sensor film is monitored, the deformation of the object can be easily visually confirmed. According to the first aspect of the present invention, the strain sensor can operate without a power source, and can be produced at a low cost with a simple structure.

  In the first aspect of the present invention, it is preferable that the sensor film is provided on at least one of the first fixing portion and the second fixing portion.

  When the sensor film is provided at the break portion, the sensor film is also broken when the break portion is broken, and the visibility is lowered. By providing the sensor film on at least one of the first fixing part and the second fixing part, the appearance of the sensor film can be grasped with good visibility.

  In the first aspect of the present invention, the first fixing portion is fixed to the first frame and the second fixing portion is fixed to the second frame in a state where tension is applied to the sensor member. Is preferred.

  By fixing the sensor member to the frame member in a state where tension is applied, the difference between the stress applied to the sensor member before the breakage portion breaks and the stress applied to the sensor member after the breakage portion breaks is obtained. Can be bigger. Since the amount of stress change before and after the fracture of the fracture portion can be increased, the appearance of the sensor film changes sufficiently. Therefore, a change in the appearance of the sensor film can be grasped with high visibility.

  In the first aspect of the present invention, the frame member includes a first leg supported by the object, a second leg supported by the object, the first leg, and the second leg. The first frame and the second frame can be divided by the bridge portion, and the first leg portion is fixed to the first fixing portion of the sensor member. Preferably, the second leg portion is fixed to the second fixing portion of the sensor member, and the bridge portion is separated from the sensor member and the object.

  Thus, when the object is deformed, the first frame and the second frame are separated at the bridge portion. Since the bridge portion is away from the object, the first frame and the second frame are smoothly separated. Further, since the bridge portion is separated from the sensor member, the broken portion of the sensor member is smoothly broken when stress is applied.

  1st aspect of this invention WHEREIN: The thickness of the said 1st leg part and the said 2nd leg part is thicker than the thickness of the said bridge part, and the thickness direction WHEREIN: The center of the said 1st leg part and the said 2nd leg part It is preferable that the position of is different from the position of the center of the bridge portion.

  When the first fixing portion is fixed to the first leg portion and the second fixing portion is fixed to the second leg portion in a state where tension is applied to the sensor member, the frame member is caused to warp the frame member. Power is added. Even if a force that causes the frame member to be warped by the sensor member is applied by making the center position of the first leg portion and the second leg portion different from the center position of the bridge portion in the thickness direction, the frame member Warpage and deformation are suppressed.

  1st aspect of this invention WHEREIN: It is preferable that the surface of the said 1st leg part which contacts the said sensor member, and the surface of the said 2nd leg part contain a curved surface.

  The surface of the first leg portion and the surface of the second leg portion that come into contact with the sensor member are rounded, so that tension is easily applied to the sensor member. In addition, when the rupture portion breaks, the tension is smoothly released, so that the appearance of the sensor film changes sufficiently.

  In the first aspect of the present invention, the sensor film preferably includes a brittle film made of a brittle material.

  When the sensor film is formed of a brittle material, when the fracture portion breaks and the brittle film is deformed, the brittle film is cracked or part of the brittle film is peeled off. Therefore, if the appearance of the brittle film is monitored, the deformation of the object can be easily grasped.

  In the first aspect of the present invention, it is preferable that the color of the surface of the sensor member provided with the brittle film is different from the color of the brittle film.

  When a crack occurs in the brittle film or a part of the brittle film is peeled off, a part of the surface of the sensor member that is the base of the brittle film is exposed. Therefore, by making the color of the surface of the sensor member, which is the base, different from the color of the brittle film, it is possible to grasp whether the brittle film has been destroyed with high visibility.

  1st aspect of this invention WHEREIN: It is preferable that the said sensor film | membrane contains the stress luminescent film | membrane formed with the stress luminescent material.

  When the sensor film is formed of a stress luminescent material, the stress luminescent film emits light when the fracture portion is ruptured and the stress luminescent film is deformed. Therefore, if the appearance of the stress-stimulated luminescent film is monitored, the deformation of the object can be easily grasped.

  In the first aspect of the present invention, it is preferable that the sensor film includes a stress color changing film formed of a stress color changing material.

  When the sensor film is formed of a stress-color-changing material, the stress-color-changing film is discolored when the fracture portion is broken and the stress-color-changing film is deformed. Therefore, if the appearance of the stress-stimulated luminescent film is monitored, the deformation of the object can be easily grasped.

  1st aspect of this invention WHEREIN: It is preferable that the surface of the said sensor member contains the uneven | corrugated area | region where several protrusion part was provided at intervals, and the said sensor film | membrane is provided in the said uneven | corrugated area | region.

  By providing the sensor film in the uneven region, when the broken portion breaks and the sensor member is deformed or displaced, the amount of strain deformation of the sensor film provided in the uneven region increases. For this reason, the degree of change in the appearance of the sensor film increases, so that the change in the appearance of the sensor film can be grasped with high visibility.

  In the first aspect of the present invention, the sensor member includes a first sensor member having a first fracture portion that fractures when a first stress is applied, and a first sensor member that fractures when a second stress different from the first stress is applied. It is preferable that the 2nd sensor member which has 2 fracture | rupture parts is included.

  By providing a plurality of sensor members each having a rupture part with different rupture stress, it is possible to grasp how much load is applied to the object and how much the object has been deformed by monitoring the sensor member having the rupture part. Can do.

  According to the second aspect of the present invention, an image data acquisition unit that acquires image data of the strain sensor according to the first aspect installed on an object, and a display device that displays the image data acquired by the image data acquisition unit And a display control unit that outputs a control signal for display on the monitoring system.

  According to the second aspect of the present invention, the deformation of the object can be monitored at a low cost with a simple structure.

  In the second aspect of the present invention, it is preferable that image data of the strain sensor is acquired by a camera, and the image data acquisition unit acquires the image data acquired by the camera by wireless communication.

  Thereby, the deformation | transformation of a target object can be monitored remotely.

  According to a third aspect of the present invention, there is provided a method for manufacturing a strain sensor that is installed on an object and detects deformation of the object, wherein the frame member is formed by connecting the first frame and the second frame in a detachable manner. A first fixing portion, a second fixing portion, and a breaking portion that is disposed between the first fixing portion and the second fixing portion and breaks when stress is applied by deformation of the object. In a state where tension is applied to the sensor member, the first fixing portion is fixed to the first frame, the second fixing portion is fixed to the second frame, and the sensor member to which the tension is applied A method of manufacturing a strain sensor is provided that includes providing a sensor film whose appearance changes when the fracture portion is fractured on a surface.

  According to the 3rd aspect of this invention, the distortion sensor which can visually recognize the deformation | transformation of a target object can be manufactured cheaply with a simple structure.

  According to the present invention, there are provided a strain sensor, a monitoring system, and a strain sensor manufacturing method, which can be created with a simple structure at low cost and can easily recognize deformation of an object such as plant equipment.

FIG. 1 is a side view showing an example of a strain sensor according to the first embodiment. FIG. 2 is a plan view illustrating an example of the strain sensor according to the first embodiment. FIG. 3 is a side view showing an example of the frame member according to the first embodiment. FIG. 4 is a plan view showing an example of a frame member according to the first embodiment. FIG. 5 is a plan view illustrating an example of a sensor member according to the first embodiment. FIG. 6 is a flowchart illustrating an example of a manufacturing method of the strain sensor according to the first embodiment. FIG. 7 is a side view showing a state in which the strain sensor according to the first embodiment is installed on an object. FIG. 8 is a side view showing a state in which the fracture portion of the sensor member of the strain sensor according to the first embodiment is broken. FIG. 9 is a plan view showing a state in which the fracture portion of the sensor member of the strain sensor according to the first embodiment is fractured. FIG. 10 is a diagram schematically illustrating an example of a monitoring system according to the first embodiment. FIG. 11 is a plan view illustrating a state in which the fracture portion of the sensor member of the strain sensor according to the second embodiment is fractured. FIG. 12 is a plan view showing a state in which the fracture portion of the sensor member of the strain sensor according to the third embodiment is fractured. FIG. 13 is an enlarged view of a part of the strain sensor according to the fourth embodiment. FIG. 14 is a plan view illustrating an example of a strain sensor according to the fifth embodiment.

  Embodiments according to the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. Some components may not be used.

  In the following description, a three-dimensional orthogonal coordinate system is set, and the positional relationship of each part will be described with reference to this three-dimensional orthogonal coordinate system. The direction parallel to the first axis in the horizontal plane is the X-axis direction, the direction parallel to the second axis in the horizontal plane orthogonal to the first axis is the Y-axis direction, and the direction parallel to the third axis orthogonal to the horizontal plane is The Z axis direction.

<First Embodiment>
A first embodiment will be described. FIG. 1 is a side view showing an example of a strain sensor 1 according to the present embodiment. FIG. 2 is a plan view illustrating an example of the strain sensor 1 according to the present embodiment. The strain sensor 1 is installed on an object and detects deformation (distortion deformation) of the object. The object is, for example, plant equipment, and examples thereof include piping equipment or mechanical equipment.

  As shown in FIGS. 1 and 2, the strain sensor 1 includes a frame member 10 installed on an object, a sensor member 20 fixed to the frame member 10, and a sensor film 30 provided on the surface of the sensor member 20. With.

  FIG. 3 is a side view showing an example of the frame member 10 according to the present embodiment. FIG. 4 is a plan view showing an example of the frame member 10 according to the present embodiment. The frame member 10 may be made of metal or plastic. As shown in FIGS. 1, 2, 3, and 4, the frame member 10 includes a first frame 11 and a second frame 12 that is detachably connected to the first frame 11. The first frame 11 and the second frame 12 are arranged in the X-axis direction.

  The frame member 10 includes a first leg portion 13 supported by the object, a second leg portion supported by the object, and a bridge portion 15 connecting the first leg portion 13 and the second leg portion 14. Have. The 1st leg part 13 and the 2nd leg part 14 are arrange | positioned away in the X-axis direction. The bridge portion 15 is disposed between the first leg portion 13 and the second leg portion 14. Two bridge portions 15 are provided in the Y-axis direction.

  The first leg 13 is provided on the first frame 11. The second leg portion 14 is provided on the second frame 12. The first frame 11 and the second frame 12 can be divided by the bridge unit 15. A first bridge 15A is provided on the first frame 11, and a second bridge 15B is provided on the second frame 12. The first bridge 15A is provided so as to protrude from the first leg portion 13 in the + X direction. The second bridge 15B is provided so as to protrude from the second leg 14 in the −X direction. The first frame 11 and the second frame 12 are connected by connecting the + X side end of the first bridge 15A and the −X side end of the second bridge 15B.

  The surface of the first leg 13 and the surface of the second leg 14 include curved surfaces. In the XZ plane, at least part of the surface of the first leg 13 and at least part of the surface of the second leg 14 are arcuate.

  As shown in FIG. 1, the thickness Ha that is the dimension in the Z-axis direction of the first leg portion 13 and the second leg portion 14 is thicker than the thickness Hb of the bridge portion 15. In the thickness direction (Z-axis direction), the center position Ca of the first leg portion 13 and the second leg portion 14 is different from the center position Cb of the bridge portion 15. The position Cb is arranged on the + Z side (upper side) than the position Ca.

  In the Z-axis direction, the position of the upper end portion 13T of the first leg portion 13 and the position of the upper end portion 14T of the second leg portion 14 are equal. The position of the upper surface 15T of the bridge portion 15 is arranged on the −Z side (lower side) with respect to the position of the upper end portion 13T and the position of the upper end portion 14T.

  In the Z-axis direction, the position of the lower end 13U of the first leg 13 and the position of the lower end 14U of the second leg 14 are equal. The position of the lower surface 15U of the bridge portion 15 is arranged on the + Z side (upper side) than the position of the lower end portion 13U and the position of the lower end portion 14U.

  The upper end portion 13T and the upper end portion 14T are the upper end portions of the curved surface. The lower end 13U and the lower end 14U are flat surfaces.

  FIG. 5 is a plan view showing an example of the sensor member 20 according to the present embodiment. As shown in FIGS. 1, 2, and 5, the sensor member 20 includes a first fixing portion 21 fixed to the first frame 11, a second fixing portion 22 fixed to the second frame 12, It has the fracture | rupture part 23 which is arrange | positioned between the 1 fixing | fixed part 21 and the 2nd fixed part 22, and fractures | ruptures when stress is added by the deformation | transformation of a target object.

  The sensor member 20 is a metal film member. The sensor member 20 may be a plastic film member.

  In the Y-axis direction, the dimension of the first fixing part 21 and the dimension of the second fixing part 22 are equal. In the Y-axis direction, the dimension of the fracture part 23 is smaller than the dimension of the first fixing part 21 and the dimension of the second fixing part 22. The fracture portion 23 is a constricted portion of the sensor member 20.

  The first leg portion 13 is fixed to the first fixing portion 21 of the sensor member 20. The second leg portion 14 is fixed to the second fixing portion 22 of the sensor member 20. The first fixing portion 21 of the sensor member 20 is fixed to at least the upper end portion 13T of the first leg portion 13. The second fixing portion 22 of the sensor member 20 is fixed to at least the upper end portion 14T of the second leg portion 14. The surface of the 1st leg part 13 and the surface of the 2nd leg part 14 which contact the sensor member 20 are curved surfaces. In the present embodiment, the first fixing portion 21 is fixed not only to the upper end portion 13T of the first leg portion 13 but also to the side surface and the lower end portion 13U of the first leg portion 13. The second fixing portion 22 is fixed not only to the upper end portion 14T of the second leg portion 14 but also to the side surface and the lower end portion 14U of the second leg portion 14.

  The sensor member 20 is supported by the first leg portion 13 and the second leg portion 14. The bridge portion 15 is separated from the sensor member 20. The first fixing portion 21 and the second fixing portion 22 of the sensor member 20 are connected to the frame member 10, and the breaking portion 23 of the sensor member 20 is separated from the frame member 10.

  The breaking portion 23 is broken when a prescribed stress is applied. The breaking stress when the breaking portion 23 is broken includes, for example, at least a part of the dimension of the breaking portion 23 in the Y-axis direction, the thickness of the breaking portion 23 (dimension in the Z-axis direction), and the material properties of the breaking portion 23. It can be adjusted by being adjusted.

  As shown in FIG. 5, a colored region 25 is provided on the surface of the first fixing portion 21. A colored region 26 is provided on the surface of the second fixing portion 22. The colored regions 25 and 26 may be formed by applying a paint to a part of a metal film member that is a base material of the sensor member 20. If the base material of the sensor member 20 is an opaque member, the colored regions 25 and 26 may be set using the color of the base material itself without using paint.

  The sensor film 30 is provided on the surface of the sensor member 20. When the broken portion 30 of the sensor member 20 breaks and the sensor member 20 is displaced or deformed, the appearance of the sensor film 30 changes.

  In the present embodiment, the sensor film 30 is a brittle film formed of a brittle material. A brittle material is a material that has a small strain to break. Examples of the brittle film include a ceramic film or a metal film.

  The sensor film 30 is provided on at least one of the surface of the first fixing portion 21 and the surface of the second fixing portion 22 among the surfaces of the sensor member 20. In the present embodiment, the sensor film 30 is provided on both the surface of the first fixing portion 21 and the surface of the second fixing portion 22.

  In the present embodiment, the sensor film 30 is provided so as to cover the colored regions 25 and 26 in the surface of the sensor member 20. The colored regions 25 and 26 are covered with the sensor film 30.

  In this embodiment, the color of the colored regions 25 and 26 on the surface of the sensor member 20 provided with the sensor film 30 (brittle film) is different from the color of the sensor film 30. When the colored regions 25 and 26 are red, a blue brittle film is employed as the sensor film 30.

  Next, an example of a method for manufacturing the strain sensor 1 according to this embodiment will be described. FIG. 6 is a flowchart showing an example of a method for manufacturing the strain sensor 1 according to the present embodiment.

  First, the first frame 11 and the second frame 12 are connected so as to be splittable. Thereby, the frame member 10 is created (step SP1).

  Next, with the tension applied to the sensor member 20, the first fixing portion 21 of the sensor member 20 is fixed to the first leg portion 13 of the first frame 11 of the frame member 10, and the second fixing portion of the sensor member 20. 22 is fixed to the second leg portion 14 of the second frame 12 of the frame member 10 (step SP2).

  After the sensor member 20 is fixed to the frame member 10, a brittle material is applied to the surface of the sensor member 20 so as to cover the colored regions 25 and 26 of the sensor member 20. Thereby, the sensor film 30 is formed on the surface of the sensor member 20 (step SP3).

  FIG. 7 is a side view showing a state in which the strain sensor 1 according to the present embodiment is installed in a pipe that is the object P. FIG. As shown in FIG. 7, the lower end 13U of the first leg 13 and the lower end 14U of the second leg 14 are connected to the object P via the sensor member 20. The bridge portion 15 is separated from the sensor member 20 and the object P.

  For example, when the object P is distorted and deformed due to an earthquake or the like, a force is applied to the strain sensor 1 installed on the object P. When a force is applied to the strain sensor 1, the first frame 11 and the second frame 12 are relatively displaced, and the first frame 11 and the second frame 12 are separated. When the first frame 11 and the second frame 12 are separated, the first fixing portion 21 is fixed to the first leg portion 13 of the first frame 11, and the second fixing portion 22 is the second leg of the second frame 12. Stress corresponding to the deformation of the object P is applied to the fractured portion 23 of the sensor member 20 fixed to the portion 14. As a result, the breaking portion 23 of the sensor member 20 is broken.

  FIG. 8 is a side view showing a state in which the fracture portion 23 of the sensor member 20 of the strain sensor 1 according to the present embodiment is fractured. FIG. 9 is a plan view showing a state in which the fracture portion 23 of the sensor member 20 of the strain sensor 1 according to the present embodiment is fractured.

  As shown in FIGS. 8 and 9, when the fracture portion 23 breaks, the sensor film 30 provided on the surface of the sensor member 20 is deformed and the appearance of the sensor film 30 changes. In the present embodiment, the sensor film 30 is a brittle film, and when the sensor film 30 is strained and deformed, as shown in FIG. 9, the sensor film 30 is cracked or part of the sensor film 30 is peeled off. Or As a result, a part of the surface of the sensor member 20 that is the base of the sensor film 30 is exposed.

  Therefore, by monitoring the appearance of the sensor film 30, it is possible to grasp whether or not the object P has been distorted and deformed.

  In the present embodiment, the color of the colored regions 25 and 26 of the sensor member 20 provided with the sensor film 30 is different from the color of the sensor film 30. Therefore, when a crack occurs in the sensor film 30 or a part of the sensor film 30 is peeled off, and at least a part of the colored regions 25 and 26 of the sensor member 20 that is the base of the sensor film 30 is exposed, Based on the color difference between the colored regions 25 and 26 and the sensor film 30, it is possible to grasp whether or not the sensor film 30 is broken with high visibility.

  FIG. 10 is a diagram schematically illustrating an example of the monitoring system 100 according to the present embodiment. The monitoring system 100 acquires the image data of the strain sensor 1 and monitors whether or not the object P is distorted. As shown in FIG. 10, the monitoring system 100 includes a computer system 101. The computer system 101 acquires an image data acquisition unit 102 that acquires image data of the strain sensor 1 installed on the object P, and a control signal for causing the display device 104 to display the image data acquired by the image data acquisition unit 102. And a display control unit 103 that outputs.

  Image data of the strain sensor 1 is acquired by the camera 105. The camera 105 may be installed on a monitoring stand provided in the plant, or may be mounted on a moving body such as a traveling robot. The camera 105 acquires image data of the strain sensor 1. The camera 105 can acquire the image data of the strain sensor 1 regardless of the height or the narrow portion.

  The image data of the strain sensor 1 acquired by the camera 105 is transmitted to the computer system 101 via the wireless communication system 106. The wireless communication system 106 includes a transmitter 106 </ b> A connected to the camera 105 and a receiver 106 </ b> B connected to the computer system 101. The image data acquisition unit 102 acquires the image data of the distortion sensor 1 acquired by the camera 105 by wireless communication.

  The display control unit 103 performs image processing on the image data acquired by the image data acquisition unit 102 and causes the display device 104 to display the image data. The display device 104 includes, for example, a flat panel display, and displays image data of the strain sensor 1.

  When it is determined based on the image data displayed on the display device 104 that the strain sensor 1 is not operating, that is, the fracture portion 23 is not fractured and the sensor film 30 is not destroyed, the object P Can be confirmed to be in a healthy state without being deformed. If the rupture stress value of the rupture portion 23 of the sensor member 20 is adjusted to the design assumed maximum load, it can be confirmed that the range where the strain sensor 1 is not operating in the plant is within the design supposition range and is sound. On the other hand, when it is determined that the strain sensor 1 is operating, that is, the fracture portion 23 is fractured and the sensor film 30 is destroyed, the object P may be deformed and not in a healthy state. Can be confirmed to be high. Measures such as inspecting or repairing such an object P can be taken.

  As described above, according to the present embodiment, the soundness of the object P can be confirmed by the strain sensor 1 having an inexpensive and simple structure that operates without a power source.

  In the present embodiment, the sensor film 30 is provided on at least one of the first fixed portion 21 and the second fixed portion 22. When the sensor film 30 is provided in the breakage part 23, when the breakage part 23 breaks, the sensor film 30 is also damaged, and the visibility is lowered. By providing the sensor film 30 on at least one of the first fixing part 21 and the second fixing part 22, the appearance of the sensor film 30 can be grasped with good visibility.

  In the present embodiment, the first fixing portion 21 is fixed to the first frame 11 and the second fixing portion 22 is fixed to the second frame 12 in a state where tension is applied to the sensor member 20. The sensor member 20 is fixed to the frame member 10 in a state where tension is applied, so that the stress (tension) applied to the sensor member 20 before the breakage portion 23 breaks and the sensor after the breakage portion 23 breaks. The difference from the stress applied to the member 20 (stress after the tension is released) can be increased. Since the amount of stress change before and after the fracture of the fracture portion 23 can be increased, the appearance of the sensor film 30 changes sufficiently. Therefore, a change in the appearance of the sensor film 30 can be grasped with high visibility.

  In the present embodiment, the first frame 11 and the second frame 12 are separated at the bridge portion 15 when the object P is deformed and deformed. Since the bridge portion 15 is away from the object P, the first frame 11 and the second frame 12 are smoothly separated. Further, since the bridge portion 15 is separated from the sensor member 20, the broken portion 23 of the sensor member 20 is smoothly broken when stress is applied.

  In addition, when the sensor member 20 is fixed to the frame member 10 in a state where tension is applied to the sensor member 20, a force that causes warping is applied to the frame member 10. The center position Cb of the bridge portion 15 is disposed above the center position Ca of the first leg portion 13 and the second leg portion 14, and the upper end portion 13T side of the first leg portion 13 and the upper end of the second leg portion 14 are disposed. By disposing the sensor member 20 on the side of the portion 14T, even if a force that causes the frame member 10 to warp is applied by the sensor member 20, warping deformation of the frame member 10 is suppressed.

  Moreover, in this embodiment, the surface of the 1st leg part 13 and the surface of the 2nd leg part 14 which contact the sensor member 20 contain a curved surface. When the surface of the first leg portion 13 and the surface of the second leg portion 14 that come into contact with the sensor member 20 are rounded, tension can be applied to the sensor member 20 smoothly. Further, since the surface of the first leg portion 13 and the surface of the second leg portion 14 are rounded, the tension is smoothly released when the breaking portion 23 is broken, so that the appearance of the sensor film 30 changes sufficiently. To do.

Second Embodiment
A second embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 11 is a plan view showing a state in which the fracture portion 23 of the sensor member 20 of the strain sensor 1 according to the present embodiment is fractured. In the present embodiment, the sensor film 30B is a stress luminescent film formed of a stress luminescent material. Stress-stimulated luminescent materials have the advantage that their mechanical properties are more stable than brittle paints.

  When the fracture portion 23 breaks, the tension is released, and a difference occurs between the stress applied to the sensor member 20 before the fracture portion 23 breaks and the stress applied to the sensor member 20 after the fracture portion 23 breaks, The film 30B emits light.

  As described above, when the sensor film 30B is formed of a stress-stimulated luminescent material, the sensor film 30B emits light when the fractured portion 23 breaks and the sensor film 30B undergoes strain deformation. Therefore, if the appearance of the sensor film 30B is monitored, the deformation of the object P can be easily grasped. Further, according to the present embodiment, the colored regions 25 and 26 may not be provided in the sensor member 20.

<Third Embodiment>
A third embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 12 is a plan view showing a state in which the fracture portion 23 of the sensor member 20 of the strain sensor 1 according to the present embodiment is fractured. In the present embodiment, the sensor film 30C is a stress color changing film formed of a stress color changing material. The stress discoloration material is a material that changes color in a stress deformation state, such as a photoelastic material. Stress discoloration materials also have the advantage of more stable mechanical properties than brittle paints.

  When the fracture portion 23 breaks, the tension is released, and a difference occurs between the stress applied to the sensor member 20 before the fracture portion 23 breaks and the stress applied to the sensor member 20 after the fracture portion 23 breaks, At least a part of the film 30C changes color.

  As described above, when the sensor film 30C is formed of the stress discoloring material, the sensor film 30C is discolored when the fractured portion 23 breaks and the sensor film 30C is strain-deformed. Therefore, if the appearance of the sensor film 30C is monitored, the deformation of the object P can be easily grasped. Further, according to the present embodiment, the colored regions 25 and 26 may not be provided in the sensor member 20.

<Fourth embodiment>
A fourth embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 13 is an enlarged view of a part of the strain sensor 1 according to the present embodiment. As shown in FIG. 13, the surface of the sensor member 20 includes an uneven region 40 in which a plurality of protrusions are provided at intervals. The sensor film 30 is provided in the uneven area 40.

  By providing the sensor film 30 in the uneven region 40, when the broken portion 23 is broken and the sensor member 20 is deformed or displaced, the strain deformation amount of the sensor film 30 provided in the uneven region 40 increases. For this reason, the degree of change in the appearance of the sensor film 30 increases, so that the change in the appearance of the sensor film 30 can be grasped with high visibility.

<Fifth Embodiment>
A fifth embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 14 is a plan view illustrating an example of the strain sensor 1 according to the present embodiment. As shown in FIG. 14, the strain sensor 1 includes a first sensor member 20 </ b> A having a first breaking portion 23 </ b> A that breaks when a first stress is applied, and a second sensor that breaks when a second stress different from the first stress is applied. It has the 2nd sensor member 23B which has the fracture | rupture part 23B, and the 3rd sensor member 23C which has the 3rd fracture | rupture part 23C which fractures when the 3rd stress different from a 1st stress and a 2nd stress is added. The first sensor member 20A, the second sensor member 20B, and the third sensor member 20C are fixed to the same frame member 10.

  By providing a plurality of sensor members 20 (20A, 20B, 20C) each having a rupture portion 23 (23A, 23B, 23C) having different rupture stresses, by monitoring the sensor member 20 having a rupture portion 23 It is possible to grasp how much load is applied to the object P and how much distortion is deformed.

DESCRIPTION OF SYMBOLS 1 Strain sensor 10 Frame member 11 1st frame 12 2nd frame 13 1st leg part 13T Upper end part 13U Lower end part 14 Second leg part 14T Upper end part 14U Lower end part 15 Bridge part 15A 1st bridge 15B 2nd bridge 15T Upper surface 15U Lower surface 20 Sensor member 20A First sensor member 20B Second sensor member 20C Third sensor member 21 First fixing portion 22 Second fixing portion 23 Breaking portion 23A First breaking portion 23B Second breaking portion 23C Third breaking portion 25 Colored region 26 Colored area 30 Sensor film 30B Sensor film 30C Sensor film 40 Concavity and convexity area 100 Monitoring system 101 Computer system 102 Image data acquisition unit 103 Display control unit 104 Display device 105 Camera 106 Wireless communication system 106A Transmitter 106B Receiver P Object

Claims (15)

A strain sensor that is installed on an object and detects deformation of the object,
A frame member installed on the object including a first frame and a second frame that is detachably connected to the first frame;
The first fixing part fixed to the first frame, the second fixing part fixed to the second frame, and the deformation of the object disposed between the first fixing part and the second fixing part. A sensor member having a rupture portion that breaks when stress is applied,
A sensor film that is provided on the surface of the sensor member and whose appearance changes when the fracture portion is fractured;
A strain sensor. The sensor film is provided on at least one of the first fixing portion and the second fixing portion.
The strain sensor according to claim 1. In a state where tension is applied to the sensor member, the first fixing portion is fixed to the first frame, and the second fixing portion is fixed to the second frame.
The strain sensor according to claim 1 or 2. The frame member includes a first leg part supported by the object, a second leg part supported by the object, and a bridge part connecting the first leg part and the second leg part. Have
The first frame and the second frame can be divided by the bridge unit;
The first leg is fixed to the first fixing portion of the sensor member;
The second leg portion is fixed to the second fixing portion of the sensor member,
The bridge portion is separated from the sensor member and the object.
The strain sensor according to claim 3. The thickness of the first leg portion and the second leg portion is greater than the thickness of the bridge portion,
In the thickness direction, the center position of the first leg part and the second leg part and the center position of the bridge part are different.
The strain sensor according to claim 3 or 4.   The strain sensor according to claim 5, wherein a surface of the first leg portion and a surface of the second leg portion that are in contact with the sensor member include curved surfaces. The sensor film includes a brittle film formed of a brittle material,
The strain sensor according to any one of claims 1 to 6. The color of the surface of the sensor member provided with the brittle film is different from the color of the brittle film,
The strain sensor according to claim 7. The sensor film includes a stress luminescent film formed of a stress luminescent material,
The strain sensor according to any one of claims 1 to 8. The sensor film includes a stress discoloration film formed of a stress discoloration material.
The strain sensor according to any one of claims 1 to 8. The surface of the sensor member includes an uneven area provided with a plurality of protrusions at intervals,
The sensor film is provided in the uneven region,
The strain sensor according to any one of claims 1 to 10. The sensor member includes a first sensor member having a first fracture portion that is fractured when a first stress is applied, and a second sensor member having a second fracture portion that is fractured when a second stress different from the first stress is applied. Including
The strain sensor according to any one of claims 1 to 11. An image data acquisition unit that acquires image data of the strain sensor according to any one of claims 1 to 12 installed on an object;
A display control unit that outputs a control signal to cause the display device to display the image data acquired by the image data acquisition unit;
A monitoring system comprising: Image data of the strain sensor is acquired by a camera,
The image data acquisition unit acquires the image data acquired by the camera by wireless communication.
The monitoring system according to claim 13. A strain sensor manufacturing method for detecting deformation of an object installed on an object,
Creating a frame member by connecting the first frame and the second frame in a splittable manner;
Tension is applied to the sensor member having a first fixing portion, a second fixing portion, and a breaking portion that is disposed between the first fixing portion and the second fixing portion and breaks when stress is applied by deformation of the object. Fixing the first fixing part to the first frame and fixing the second fixing part to the second frame,
On the surface of the sensor member to which the tension is applied, providing a sensor film whose appearance changes when the rupture portion breaks;
A method for manufacturing a strain sensor including:

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