JP2015145822A - Displacement detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a displacement detection device capable of: appropriately supporting a line sensor against a detection object; enhancing detection accuracy of displacement in each part on a surface of the detection object obtained by analyzing an image captured by the line sensor; and improving attachment workability to the detection object.SOLUTION: Fixing means 30 for fixing a line scanner 10 to a surface of a detection object 80 includes: projecting support leg parts; and fixed foot parts that are fixed to the surface of the detection object 80. The line scanner 10 is fixed to the detection object 80 by engaging the projecting support leg parts with the corresponding fixed foot parts from a direction different from a direction where a load is applied, An image of the surface of the detection object 80 is captured by a line sensor, the captured image is analyzed by analysis means 50, and then displacement or the like in each point on the surface of the detection object 80 is found. As a result, the image of the surface of the detection object 80 can be properly captured and displacement detection accuracy can be improved with the line sensor kept in a stable support state in which the line sensor does not move in a normal direction of the surface of the detection object 80.

Description

  The present invention relates to a displacement detection apparatus that can detect minute displacements and distortions in a detection object from a captured image of the detection object by image analysis.

In the maintenance and management of structures, it is important to detect deterioration of members at an early stage and immediately take appropriate measures. However, among various materials used for structures, brittle materials such as concrete and ceramic cannot be easily identified because even if they are cracked due to applied load or material deterioration, for example, their deformation is extremely small. In order to grasp the deformation state, high-precision measurement was required. For these measurements, strain gauges have been generally used for some time, but in recent years, the surface of an object is imaged with a camera, etc., and displacement (strain) is obtained from the obtained image by image analysis based on the digital image correlation method. A detection method has been proposed.
Examples of conventional displacement detection methods based on image analysis include those disclosed in Japanese Patent Laid-Open Nos. 2005-99012 and 2007-170955.

JP 2005-99012 A JP 2007-170955 A

  Among the conventional methods for detecting displacement by image analysis, the one disclosed in Patent Document 1 performs measurement on the surface of a detection object by performing analysis using an image captured by a camera and obtaining displacement. However, it is difficult to make the imaging environment such as illumination constant every time the camera captures a predetermined part, and the accuracy of the analysis is limited due to the number of pixels of the camera. It is difficult to completely correct the aberration of the lens used in the camera, and the error caused by this is unavoidable. Depending on the camera's imaging position relative to the detection target, the captured image itself may be distorted. There were problems such as the point affecting the analysis.

  On the other hand, in Patent Document 2, it is proposed to perform imaging using a scanner, and it can be expected to solve the problem in the case of imaging with a camera. However, when using a scanner, since the focal length of the line sensor mounted on the scanner is very short, it is necessary to support and fix the scanner so that the line sensor keeps an appropriate minute distance from the surface of the object to be detected. Necessary to secure However, in the above-mentioned Patent Document 2, a specific point is that the scanner is supported in the vicinity of the detection target so that the line sensor can perform imaging with an appropriate positional relationship with respect to the detection target surface and perform displacement detection. Was not shown.

  For this reason, a specific scanner that is arranged in the vicinity of the detection target so that the line sensor can maintain an appropriate positional relationship with the detection target surface and can perform imaging with the line sensor is actually provided. There is a strong need to establish a device structure.

  The present invention has been made in order to solve the above-described problems. Image analysis is performed from a captured image of a line sensor that captures the surface of the detection target with appropriate support of the scanner body including the line sensor for the detection target. An object of the present invention is to provide a displacement detection device that can improve the detection accuracy of the displacement of each part of the surface of the detection target obtained by the above and improve the workability of attachment to the detection target.

  A displacement detection device according to the present invention includes a line scanner that images a surface of a detection target with a line sensor, and an analysis unit that analyzes an image captured by the line scanner and obtains displacement or distortion of the detection target. In the detection device, the line scanner includes a main body that movably supports the line sensor, and fixing means that fixes the main body to a detection target, and the fixing means includes three or more places on the main body. The support leg portion is provided in a partially protruding state at a plurality of locations, and the distal end portion of the protruding portion is formed larger than the other portion in the vicinity of the distal end portion, and the arrangement interval of the support leg portion in the main body portion. A plurality of fixed feet that are fixed to the surface of the object to be detected at predetermined corresponding intervals and that engage with the protruding portion tips of the support legs to support the support legs. Of support legs A notch portion that allows the leading end of the protruding portion to be inserted from a direction other than the normal direction of the surface of the detection target at the fixed foot fixing position, and the other portion in the vicinity of the leading end of the support leg continuously from the notched portion. A groove portion that is insertable and has a size smaller than the tip portion, and that restrains the movement of the detection target surface in the normal direction relative to the fixed foot portion of the support leg tip portion, Each of the fixed foot portions is fixed to the surface of the detection object, and the opening portion of the notch portion is directed to the same one direction.

  As described above, in the present invention, as the fixing means for fixing the main body of the line scanner to the surface of the detection target, the support leg protruding from the main body and the fixed foot attached to the surface of the detection target are provided. Detected after fixing the distance and direction of the line scanner to the object to be detected by engaging the support leg from a direction different from the direction in which the load is applied to the fixed foot fixed to the surface of the object. The line sensor is matched with the imaging direction by capturing a predetermined range on the surface of the object one or more times with a line sensor, analyzing the captured image with an analysis means, and determining the displacement of each point on the surface of the detection object. As a stable support state that does not move in the normal direction of the detected object surface, the imaging of the detected object surface can be appropriately advanced, the captured image can be analyzed accurately, and the displacement detection accuracy can be improved. That. In addition, the tip of each support leg can be inserted into the notch of the fixed foot in the same orientation at a time so that the main body can be easily shifted to the support and fixed state. Efficiency is also greatly improved.

  Further, in the displacement detection device according to the present invention, if necessary, the fixed foot portion of the fixing means is provided with a foot main body portion fixed to the surface of the object to be detected, the notch portion and the groove portion, and the foot main body. And a foot surface portion that is attached to the portion so that the orientation of the notch portion can be adjusted.

  As described above, in the present invention, the fixed foot portion fixed to the detection target surface of the fixing means is a combination structure of the foot main body portion and the foot surface portion, and the orientation of the notch portion of the foot surface portion. Can be adjusted with respect to the foot body so that the notch can be oriented in the same direction between the fixed feet by adjusting the foot surface even after the foot body is fixed to the surface of the object to be detected. While securing the detection accuracy based on stable support, the direction of the notch is aligned with the other fixed feet when attaching the fixed feet to the surface of the object to be detected. The trouble of attaching the fixed foot portion can be saved, and the efficiency of the attaching work can be improved.

  In addition, the displacement detection device according to the present invention is centered on a screw shaft where the attachment of the foot surface portion of the fixed foot portion to the foot main body portion coincides with the normal direction of the surface of the detection object, as necessary. When the foot surface portion is screwed and tightened between the foot main body portion and the foot surface portion and tightened, both the foot main body portion and the foot surface portion are in contact with each other. An elastic body is provided.

  As described above, in the present invention, the foot main body part and the foot surface part forming the fixed foot part are integrated by screwing the foot surface part to the foot main body part, and the foot main body part and the foot surface part are An elastic body is disposed between the foot body portion and the foot surface portion, and the elastic body comes into contact with the foot body portion and the foot surface portion in a state where the foot body portion and the foot surface portion are tightened to each other. While adjusting the direction of the notch of the foot surface part to be screwed to match that of the other fixed foot part, if the foot surface part is brought into contact with the elastic body and the elastic body is elastically deformed, the elastic body The surface part can be constrained and the foot surface part can be held in a relaxed state, and the orientation of the notch can be reliably maintained.Once the foot surface is adjusted and the orientation of the notch is aligned with the others, the notch The tip of the support leg on the main body side is inserted into the notch and fixed. Working properly and smoothly performed that is to improve the efficiency of the work of the device fixing.

  In addition, the displacement detecting device according to the present invention can adjust the protruding amount of the protruding portion of the supporting means of the fixing means as needed, and the protruding portion tip portion on the main body side with respect to the main body portion. Urging means for urging in the direction of drawing to the main body, and disposed at three or more locations separated from each other so that the amount of protrusion can be adjusted in a direction parallel to the direction in which the line sensor captures an image. An interval adjustment unit is provided that maintains the distance between the main body and the surface of the detection object so that the end is brought into contact with the surface of the detection object in an engaged state between the body and the fixed foot.

  As described above, in the present invention, the protrusion amount of the support leg can be adjusted with respect to the main body, and the support leg is attached to the main body in a direction in which the tip of the support leg is pulled toward the main body by the urging means. When the support leg and the fixed foot are engaged, the main body receives a biasing force so that the main body relatively moves toward the support leg tip with respect to the fixed support leg. While trying to get closer to the detection object side, the end of the gap adjustment part protruding to the main body part contacts the detection object surface, and the distance between the main body part and the detection object surface is the protrusion of the gap adjustment part. By adjusting the amount according to the amount, the distance between the line sensor of the main unit and the surface of the object to be detected can be adjusted to an appropriate value corresponding to the focal length of the line sensor by adjusting the protrusion amount of each interval adjustment unit. Even if the fixed position of each fixed foot on the surface of the object is not on the same plane, The amount of protrusion of the interval adjustment unit can be adjusted to increase or decrease so that the direction of the line sensor faces the surface of the object to be detected, and the surface of the object to be detected can be clearly imaged by the line sensor to increase the accuracy of detection of displacement, etc. .

  Further, the displacement detection device according to the present invention has a taper surface that tapers as the distance from the surface of the object to be detected, as the groove portion of the fixed foot portion in the fixing means surrounds the groove, if necessary. The tip of the support leg is formed with a tapered surface that tapers as it approaches the main body.

  As described above, in the present invention, the surface surrounding the groove portion of the fixed foot portion is formed as a tapered surface, and the tapered surface is formed near the main body portion of the enlarged tip end portion of the support leg portion. When the taper surfaces of the fixed foot and the support leg are in contact with each other in the engaged state with the leg, the center of the fixed foot and the center of the support leg can be easily aligned with each other, and the taper can be accurately positioned. When the taper angles of the surfaces are different, there is a slight degree of freedom in tilting the support leg from the normal direction of the surface of the detection target in the engaged state of the fixed foot and the support leg, and the surface property of the detection target is not satisfactory. Even if the positional relationship between each support leg and the fixed foot is not uniform due to the transition of the position adjustment of the main body, etc., the moment from the support leg to the fixed foot It is difficult to act and an abnormal force is applied to the fixed foot to detect it. It is not such as to fall off from the object.

  In addition, the displacement detection device according to the present invention can be slidable to a plurality of guide rail portions arranged in parallel with each other at a predetermined interval, and to the guide rail portions, if necessary. A plurality of linear guides, which are arranged and have a plurality of slider portions to which the line sensor is integrally attached, and which support the line sensor so as to be linearly movable in a direction orthogonal to the main scanning direction of the line sensor; And a linear motion mechanism that moves the line sensor along the linear guide, and the linear guides are arranged in a substantially symmetrical manner with respect to the center position of the line sensor in the main scanning direction. A plurality of the linear motion mechanisms that are spaced apart from each other and each movable part that moves together with the line sensor is connected to each Respectively predetermined position of the line sensor as the slider portion near the Agaido coupled, and moves the line sensor in synchronization with each other.

  As described above, in the present invention, a plurality of linear guides that movably support the line sensor are provided, and the plurality of linear guides are spaced apart with a substantially symmetrical positional relationship across the center position of the line sensor in the main scanning direction. In addition, a plurality of linear motion mechanisms are provided corresponding to the linear guides, and a force for movement is applied to each line sensor in the vicinity of each linear guide. The linear guide supports the line sensor in a well-balanced manner, and makes it difficult for the line sensor to shake around the roll axis. The linear motion mechanism also applies force to the line sensor in the vicinity of each linear guide to make it difficult for the yaw axis to oscillate, and in the sub-scanning direction with the line sensor suppressed in each direction. It can move and image, and can improve detection accuracy.

It is use condition explanatory drawing of the displacement detection apparatus which concerns on one Embodiment of this invention. It is a principal part top view of the displacement detection apparatus which concerns on one Embodiment of this invention. It is a principal part bottom view of the displacement detection apparatus which concerns on one Embodiment of this invention. It is a principal part front view of the displacement detection apparatus which concerns on one Embodiment of this invention. It is a principal part right view of the displacement detection apparatus which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a block diagram of the displacement detection apparatus concerning one embodiment of the present invention. It is a top view of the fixed leg part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is separation state explanatory drawing of the foot main-body part of a fixed leg part, and a foot surface part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is position explanatory state explanatory drawing of the foot surface part with respect to the foot main-body part of the fixed foot part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is engagement state explanatory drawing of the support leg front-end | tip part to the fixed leg part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the attachment process to the detection target object surface of the main-body part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the attachment state to the detection target object surface of the main-body part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the pressing state to the detection target object surface of the main-body part in the displacement detection apparatus which concerns on one Embodiment of this invention. It is a space | gap adjustment state explanatory drawing of the main-body part and the detection target object surface in the displacement detection apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of a detection target surface imaging state of the line sensor in the displacement detection apparatus which concerns on one Embodiment of this invention. It is a graph which shows the distortion change of the subscanning direction of the detection target object surface acquired as Example 1 with the displacement detection apparatus in this invention. It is a graph which shows the distortion change of the subscanning direction of the detection target object surface acquired as the comparative example 1 with the displacement detection apparatus different from this invention. It is a graph which shows the distortion | strain change of the diagonal 45 degree direction of the detection target object surface acquired as Example 2 with the displacement detection apparatus in this invention. It is a graph which shows the distortion | strain change of the diagonal 45 degree direction of the detection target object surface acquired as the comparative example 2 with the displacement detection apparatus different from this invention. It is strain distribution image explanatory drawing of the detection target object surface obtained with the displacement detection apparatus of this invention.

  Hereinafter, a displacement detection apparatus according to an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the detection target is a large structure whose surface is made of concrete, and the part to be detected is a vertical wall that is continuous in the vertical and horizontal directions, and the line scanner is fixed to the vertical wall. An example of detecting displacement and the like will be described.

  In each of the drawings, a displacement detection apparatus 1 according to the present embodiment includes a line scanner 10 that captures a surface image of a detection target with a line sensor 12, and each part of the detection target surface by analyzing the image captured with the line scanner 10. It is the structure provided with the analysis means 50 which calculates | requires the displacement and distortion | strain.

  Among these, the line scanner 10 includes a main body 20 that movably supports the line sensor 12 and a fixing unit 30 that fixes the main body 20 to the detection target 80.

  The main body portion 20 includes a frame-like outer frame 21 to which a plurality of fixing means 30 can be attached, and a substantially box-like mechanism portion 22 that is attached to the outer frame 21 and supports the line sensor 12 movably. It is a configuration.

  The outer frame 21 is a rectangular frame body having a rigid structure capable of supporting the mechanism portion 22 without being deformed even when fixed to the detection target 80 via the fixing means 30, and is formed on two opposite sides of the frame. In this configuration, the end of the mechanism 22 can be attached.

  The mechanism 22 is a linear guide 13 that supports the line sensor 12 so as to be linearly movable, and a linear motion mechanism that rotates the screw shaft parallel to the linear guide 13 to move the line sensor 12 along the linear guide 13. The ball screw mechanism 14, the linear encoder 15 that acquires the position of the moving line sensor 12, the motor 16 that drives the ball screw mechanism 14, and the motor 16 based on the line sensor position acquired by the linear encoder. It is the structure provided with the control part 17 which controls. Among these, the linear guide 13, the ball screw mechanism 14, the linear encoder 15, and the motor 16 are known as mechanisms for linearly moving a predetermined object with high accuracy and are not described in detail.

  The moving line sensor 12 is integrated with a slider portion 13a of the linear guide 13, a nut portion 14a of the ball screw mechanism 14, and a detection portion 15a of the linear encoder 15, and is fixed to the mechanism portion 22. The guide rail portion 13b of the linear guide 13, the screw shaft portion 14b of the ball screw mechanism 14, and the scale portion 15b of the linear encoder 15 are moved together with the line sensor 12.

  In the mechanism unit 22, two linear guides 13 are provided in parallel with a predetermined interval with respect to the moving line sensor 12, so that the line sensor 12 is less likely to shake around the roll axis. Further, the slider portion 13a integrated with the line sensor 12 in the linear guide 13 is longer than usual with respect to the guide rail portion 13b on the fixed side, so that each swing around the yaw axis and the pitch axis is less likely to occur. Yes. Further, two ball screw mechanisms 14 are also provided corresponding to the respective linear guides 13, and the driving force is given to the line sensor 12 in a well-balanced manner so that the vibration around the yaw axis does not easily occur.

  Further, the mechanism unit 22 is attached to the outer frame 21 so that the position can be finely adjusted in the vertical and horizontal directions, and the movement path of the line sensor 12 in a state where the main body unit 20 is fixed to the detection target 80 by the fixing means 30. Can be corrected when the positional relationship with the preset detection range is slightly deviated.

  A cushioning material 22a such as a sponge that fills the space between the mechanism portion 22 and the surface of the detection object without any gap while being elastically deformed is provided on the outer peripheral portion of the mechanism portion 22 that faces the surface of the detection object. The buffer material 22a prevents external light from entering the inside of the mechanism portion where the line sensor 12 is located from the gap between the mechanism portion 22 and the surface of the detection target.

  The line sensor 12 movably provided in the mechanism unit 22 is a publicly known sensor used for a flat bed scanner of a contact sensor (CIS) type in which an optical system, an image sensor, and a light source, which are linearly arranged, are integrated. Since it is a sensor unit, detailed description is abbreviate | omitted. The imaging of the surface of the detection target 80 by the line sensor 12 is performed at each timing before and after the external force is artificially applied to the detection target 80, and information on the image obtained by the line sensor 12 ( Data) is output to the analyzing means 50.

  The fixing means 30 includes a support leg 31 provided in a partially protruding state at a plurality of locations on the main body 20, and a surface of the detection object 80 at a predetermined interval corresponding to the arrangement interval of the support leg 31 in the main body 20. A plurality of fixed foot portions 32 that are fixed to the support leg portion 31 and that support and support the support leg portion 31, and a plurality of fixed leg portions 32 are disposed at the outer peripheral position of the mechanism portion 22 in the main body portion 20. In the engaged state, a part is brought into contact with the surface of the detection object, and a distance adjustment unit 33 that maintains the distance between the main body 20 and the surface of the detection object so as to be adjustable is provided.

  The support leg portion 31 includes a base portion 34 attached to the outer frame 21 of the main body portion 20, a protruding shaft portion 35 that is supported by the base portion 34 so as to be movable within a predetermined range in the imaging direction of the line sensor 12, A spring 36 is provided as an urging means for urging the protruding shaft portion 35 toward the main body portion 20 with respect to the base portion 34.

The protruding shaft portion 35 is formed of an elongated shaft-like member, is supported by each base portion 34, and is in a state of partially protruding from the main body portion 20, and the tip portion 35a of the protruding portion is replaced with the tip portion 35a. It is the structure formed largely with respect to the other part of the vicinity. That is, a portion of the protruding shaft portion 35 closer to the main body portion 20 than the distal end portion 35a is formed as a small diameter portion 35b smaller than the distal end portion 35a.
And the front-end | tip part 35a of the protrusion shaft part 35 is formed with the taper surface which becomes tapered as it approaches the main body part 20.

  The protruding shaft portion 35 can adjust the amount of protrusion from the main body portion 20, and is biased by the spring 36 to pull the protruding portion distal end portion 35 a toward the main body portion 20 with respect to the main body portion 20. For this reason, in the engaged state of the support leg portion 31 and the fixed foot portion 32, the main body portion 20 is relatively moved by the bias of the spring 36 that tries to draw the tip portion 35a of the protruding shaft portion 35 toward the main body portion side. This is a mechanism that approaches the fixed foot 32 side, that is, the detection object 80 side (see FIG. 16).

  The fixed foot portion 32 is fixed to the surface of the detection object 80 at a predetermined interval corresponding to the arrangement interval of the support leg portions 31 in the main body portion 20, and the protruding portion tip portion 35 a of the protruding shaft portion 35 in the support leg portion 31. It is the structure which supports and supports the support leg part 31.

  The fixed foot 32 is screwed onto the surface of the object 80 to be detected by screwing, anchor driving, adhesion with an adhesive, adsorption by magnetic force, etc. A foot surface portion 38 to be attached and an annular elastic body 39 disposed so as to be sandwiched between the foot main body portion 37 and the foot surface portion 38 are provided.

  The foot main body portion 37 is formed as a substantially dish-like body having an upright portion having a predetermined height on the entire circumference of the outer edge portion of the disk, and is used for screwing at the center of the bottom surface portion serving as a contact surface to the surface of the detection object 80. And a female screw 37b is formed on the inner periphery of the standing portion that is continuous in a ring shape. The female screw 37b has a screw axis direction that coincides with the normal direction of the bottom surface portion of the foot main body portion 37, and is a screw in a direction orthogonal to the surface of the detection object 80 with which the bottom surface portion of the foot main body portion 37 contacts. Yes.

  The foot surface portion 38 is formed as a substantially dish-like body having a standing portion with a predetermined height around the outer periphery of the disc that is smaller than the foot body portion 37, and has an external thread 38a on the outer periphery of the standing portion that is continuous in a ring shape. The male screw 38a is screwed into the female screw 37b of the foot main body 37 with the bottom surface of the plate facing the surface, and is attached to the front surface of the foot main body 37.

  The foot surface portion 38 is a surface of the detection object 80 such that the tip of the protruding portion of the support leg 31 is laterally or upwardly from the bottom surface portion to the standing portion which is the surface side in the attached state to the foot main body portion 37. A notch 38b that can be inserted from a direction other than the normal direction is formed, and a slot 35b smaller than the tip 35a can be inserted into the notch 38b so that the small-diameter portion 35b of the support leg 31 can be inserted. A groove 38c having a width is formed.

  The groove portion 38c of the foot surface portion 38 has a taper surface that tapers away from the bottom surface side of the foot main body portion 37 in a state of the fixed foot portion 32 integrated with the foot main body portion 37 as a surface surrounding the groove. In other words, the tapered surface becomes tapered as the distance from the surface of the detection target object increases with the fixed foot 32 attached to the detection target object 80.

  The foot surface portion 38 is attached to the foot main body portion 37 and is screwed about a screw shaft parallel to the normal direction of the bottom surface portion of the foot main body portion 37. In this configuration, the orientation of the notch 38 b can be adjusted with respect to the portion 37. By adjusting the direction of the foot surface portion 38 in a state where each fixed foot portion 32 is fixed to the surface of the detection object 80 (see FIG. 12), each fixed foot portion 32 has the same opening portion of the notch portion 38b. It is in a state of facing one direction.

  And the notch part 38b makes it possible to insert the protrusion part front-end | tip part of the support leg part 31 from other than the normal direction of the surface of the detection target 80 in the fixed leg 32 fixed position, and continues to the notch part 38b. The groove 38c is a groove smaller than the tip 35a of the protruding shaft portion 35 of the support leg 31 inserted into the groove 38c (see FIG. 13), so that the tip of the support leg 31 is fixed to the fixed foot 32. The movement of the detection target surface in the normal direction can be restricted, and the support leg 31 can be fixed so as not to be detached from the fixed leg 32.

  The elastic body 39 is provided between the foot body portion 37 and the foot surface portion 38, and when the foot surface portion 38 is screwed into the foot body portion 37 and tightened, either the foot body portion 37 or the foot surface portion 38 is secured. It will be in a contact state.

  While adjusting the direction of the notch 38b of the foot surface portion 38 to be screwed to the foot main body portion 37 so as to match that of the other fixed foot portion, the foot surface portion 38 is screwed to sufficiently contact the elastic body 39. When tightened, the elastic body 39 that comes into contact with and restrains the foot main body portion 37 and the foot surface portion 38 is elastically deformed (see FIGS. 9 and 10), and the elastic body 39 is caused by the reaction force accompanying this elastic deformation. Will restrain the foot surface portion 38, and the foot surface portion 38 can be held in a loose state. For this reason, if the direction of the notch part 38b is matched with the other while tightening the foot surface part 38 (see FIG. 12), the direction of the notch part 38b will not be shifted, and the orientation of the notch part 38b will be the whole fixed foot part. Thus, it is possible to appropriately and smoothly perform the operation of inserting and fixing the tip of the support leg on the side of the main body 20 into the notch while reliably maintaining the state of matching.

  The interval adjusting unit 33 is arranged at four locations on the outer periphery of the mechanism unit 22 so that the amount of protrusion can be adjusted in a direction parallel to the direction imaged by the line sensor 12 with respect to the mechanism unit 22 of the main body unit 20. In the engaged state of the support leg portion 31 and the fixed foot portion 32, the end portion is brought into contact with the surface of the detection object, and the distance between the main body portion 20 and the surface of the detection object is maintained to be adjustable.

  That is, in the engaged state of the support leg 31 and the fixed foot 32, the main body 20 is relatively moved by the bias of the spring 36 that tries to draw the protruding portion tip 35a of the support leg 31 toward the main body. Therefore, the end of the distance adjusting unit 33 protruding outside the mechanism unit 22 of the main body unit 20 comes into contact with the surface of the detection target object. Is a mechanism that can keep the surface of the detection object from approaching further.

  And the space | interval of the mechanism part 22 with the line sensor 12 and the detection target object surface can be made appropriate by adjusting the protrusion amount from the main-body part 20 side of this space | interval adjustment part 33. FIG. As a specific adjustment, once the surface of the detection object is imaged by the line sensor 12 and the shift of the focal point (focus) appearing in the obtained captured image is confirmed. A series of steps of correcting the position of the line sensor 12 with respect to the surface of the detection target is corrected several times so as to eliminate the focus shift.

  Since the distance adjusting unit 33 is positioned on the outer periphery of the mechanism unit 22 closer to the line sensor 12 than the outer frame 21 with the support leg 31, a change in the protruding amount of the distance adjusting unit 33 with respect to the detection target surface of the line sensor 12 is detected. The influence on the positional relationship is increased, and the line sensor position can be finely adjusted by adjusting the protrusion amount of the interval adjusting unit 33.

  The protrusion amount of the interval adjustment unit 33 that is a measure of the distance between the mechanism unit 22 and the surface of the detection target is measured using a protrusion amount measuring device 25 provided on the outer periphery of the mechanism unit 22 in the vicinity of each interval adjustment unit 33. Therefore, the worker can grasp it. That is, the value indicated by the protrusion amount measuring device 25 when the tip of the protruding portion of the protrusion amount measuring device 25 is brought into contact with the surface of the object to be detected corresponds to the protrusion amount of the interval adjusting unit 33 in the vicinity thereof. . Each time the operator adjusts the amount of protrusion of the distance adjusting unit 33 from the main body 20 side, the tip of the protruding portion of the protrusion amount measuring device 25 is brought into contact with the surface of the object to be detected. While confirming the change in the indicated value and grasping the amount of increase / decrease due to the adjustment, the distance between the mechanism 22 and the surface of the detection target can be precisely adjusted.

  Among the detection objects, the parts where the fixed feet 32 are attached and fixed are not on the same plane, or other parts of the surface of the detection object are inclined with respect to the parts where the fixed legs are attached and fixed. Even when the amount of protrusion of each interval adjustment unit 33 is the same, the line sensor 12 is not in a state of facing the detection target surface, and even in a situation where partial defocusing occurs, a plurality of interval adjustment units By adjusting the adjustment amounts so as to be different from each other, the mechanism unit 22 can be appropriately positioned, and the surface of the detection target can be imaged by the line sensor 12 without defocusing.

With respect to the initial value of the protrusion amount of the interval adjusting unit 33, since the positional relationship between the interval adjusting unit 33 and the line sensor 12 is known, the fixed foot portions 32 are fixed and the interval adjusting units 33 are in contact with each other. When it is assumed that the surface of the detection object is a plane, the line sensor 12 and the surface of the detection object are in an appropriate positional relationship, that is, a state in which the focus of the line sensor is in a positional relationship that allows the imaging to be performed correctly with the detection object surface. It is desirable to set the protruding amount so that
In addition, the space | interval adjustment part itself can add the parameter | index (scale) which can confirm protrusion amount, and it can also make it the space | interval adjustment part serve as a protrusion amount measuring device.

  The analysis means 50 analyzes between the two images for each position in the imaged range from the two images before and after the same object was imaged at a time by analysis using a known digital image correlation method. The generated displacement is obtained, and the strain is obtained from the displacement at each position in the imaged range as necessary. More specifically, from the two captured images of the surface of the detection target 80 obtained before and after a predetermined time obtained by the line sensor 12, the displacement of each position is detected for each position on the detection target surface by the analysis. Or to determine the strain generated.

  The analysis unit 50 is a computer having a CPU, a memory, an input / output interface, and the like as its hardware configuration, and can receive captured image data from the line sensor 12 and stores a program stored in the memory or the like. That is, the displacement at each position on the surface of the detection object is obtained from the two captured images before and after the surface of the detection object obtained by the imaging means 10 by the analysis by the digital image correlation method, and for each position from this displacement. This is a mechanism for operating the computer as the analysis means 50 by a predetermined program for executing the function of acquiring the strain of the above. The computer constituting the analyzing means 50 may be a microcomputer integrally formed with a CPU, a memory, a ROM, and the like.

  If the analyzing means 50 is a small and portable computer, the apparatus can be light and simple, and can be easily carried to the detection work site and set for detection. When the analysis unit 50 is a computer, the line sensor 12 and the control unit 17 are controlled via a predetermined interface, and the operation related to the imaging of the line sensor 12 and the operation of each unit related to the movement of the line sensor 12 are analyzed. The instructions may be adjusted on the means 50 side, and it is possible to improve work efficiency by eliminating the need for individual operation of each part.

  The strain distribution on the surface of the detection object 80 obtained by the analyzing means 50 is, for example, when there is a crack on the surface of the detection object, corresponding to the minute displacement of the cracked portion after applying external force (loading), This includes a group of strains in which strains greatly differing in magnitude and direction from each other are concentrated in a substantially linear shape. The strain distribution is displayed on the display means 55 so that an observer can visually recognize this strain or perform another image analysis. By extracting the substantially linear strain group from the strain distribution image and identifying it as a crack, it is possible to detect the crack.

  For the convenience of analysis by the digital image correlation method of the analysis means 50, the film surface to be imaged needs to be in a surface state in which a random pattern difference exists at a predetermined density, but is not particularly smoothed. An ordinary object, particularly a concrete surface of a structure, which has been exposed to the outside air and has passed a predetermined time since manufacture is in the surface state in the first place, and therefore is imaged by the line sensor 12 without any pre-processing. it can. If necessary, a pattern suitable for image analysis may be added to the surface of the detection target object by applying paint or the like.

  The display means 55 receives the image data of the strain distribution on the surface of the detection object acquired by the analysis means 50, and displays it as an image of a strain distribution diagram associated with the image area on the surface of the detection object. The detailed display will be omitted. The display means 55 may be a display portion of a computer forming the analysis means 50, and is particularly portable when the computer is small, such as a so-called laptop computer (see FIG. 1). It can be made extremely simple, and is suitable for handling at the detection work site.

  Next, installation of the displacement detection device according to the present embodiment and displacement detection using the device will be described. As a premise, it is assumed that the surface of the detection object 80 is in a surface state suitable for image analysis based on the digital image correlation method, naturally or artificially by pre-processing before the installation of the apparatus.

  First, the fixed foot 32 of the fixing means 30 is fixed to the detection target 80. As a procedure, first, the foot main body portion 37 of the fixed foot portion 32 is fixed to the surface of the detection object 80 by screwing or the like at a predetermined interval corresponding to the arrangement interval of the support leg portions 31 in the main body portion 20. Specifically, the foot main body 37 is applied to the surface of the object to be detected while using a guide adapted to the fixing interval of the fixed foot 32 to the object 80 to be detected, and the hole 37a at the center of the bottom surface of the foot main body 37 is inserted. Screws and anchors are inserted and fixed to the detection object 80. Along with this fixing, the bottom surface portion of the foot main body portion 37 comes into close contact with the surface of the detection target object 80, and the normal direction of the bottom surface portion of the foot main body portion 37 and the normal direction of the surface of the detection target object 80 in contact with the bottom surface portion. It becomes a state that matches.

  Subsequently, the male screw 38 a of the foot surface portion 38 is screwed into the female screw 37 b of the foot main body portion 37 to attach the foot surface portion 38 to the surface side of the foot main body portion 37. At this time, the elastic body 39 is sandwiched between the main body portion 37 and the foot surface portion 38.

In a state where the foot surface portion 38 is screwed to the foot body portion 37, the foot surface portion 38 is the same as the foot body portion 37, and the opening portions of the notch portions 38b are finally the same in all the fixed foot portions 32. The foot surface portion 38 is screwed and tightened until it is in sufficient contact with the elastic body 39 while being in a state of being directed in one direction. Thereby, the elastic body 39 restrained by contact with the foot main body portion 37 and the foot surface portion 38 is elastically deformed, and the elastic body 39 restrains the foot surface portion 38 by the reaction force accompanying this elastic deformation, The foot surface portion 38 can be held in an unloosened state. Due to the restraint of the foot surface portion 38, the direction of the cutout portion 38b is not easily displaced, and the state in which the orientation of the cutout portion 38b is consistent with the entire fixed foot portion can be reliably maintained.
The fixing leg 32 is engaged and fixed by inserting the tip of the support leg 31 on the main body 20 side into the notch 38b (see FIG. 14).

  When the support leg 31 is not particularly restricted, the tip 35a is moved closer to the outer frame 21 due to the urging force of the spring 36, so that the protrusion shaft 35 of the support leg 31 is pushed sufficiently against the repulsive force of the spring 36. Then, the shaft fixing screw 31a is tightened to maintain the protrusion.

  And the front-end | tip part 35a which the corresponding support leg part 31 protrudes into the notch part 38b of the foot | leg surface part 38 in all the fixed leg | foot parts 32, Furthermore, this front-end | tip part 35a is inserted into the inside of the fixed leg | foot part 32. The small-diameter portion 31b of the support leg portion 31 is inserted into the groove portion 38c continuous with the notch portion 38b (see FIG. 13).

  The groove portion 38c of the foot surface portion 38 has a tapered surface that tapers away from the bottom surface portion side of the foot main body portion 37 as a surface surrounding the groove, and this is the main body of the main body portion of the support leg portion 31. The closer to the portion 20, the closer to the tapered surface that tapers. Thereby, the center of the fixed leg part 32 and the center of the support leg part 31 can be easily aligned, and can be positioned accurately. And when the taper angle of each taper surface is different, there is a slight degree of freedom in tilting the support leg 31 from the normal direction of the surface of the object to be detected while the fixed leg 32 and the support leg 31 are engaged. Even when the positional relationship between each support leg 31 and the fixed foot 32 is not uniform, such as uneven surface properties of the detection target, a moment is generated from the support leg 31 to the fixed foot 32. It is difficult to act, and an abnormal force is applied to the fixed foot portion 32 so that the fixation to the detection target is not released, and the fixed foot portion 32 does not fall off the detection target.

  In the fixed foot portion 32 engaged with the support leg portion 31, the opening position of the notch portion 38b is other than the normal direction of the surface of the detection target 80 such as the side or the upper side, and the groove portion 38c supports the notch portion 38b. By being smaller than the tip part 35 a of the leg part 31, the movement of the support leg part 31 in the normal direction of the surface of the detection target with respect to the fixed leg part 32 is restricted, and the main body part 20 is supported by the support leg part 31. Even if the load is applied, the support leg portion 31 does not come off the fixed foot portion 32. In this way, the support leg portion 31 and the fixed foot portion 32 as the fixing means 30 provide a state in which the main body portion 20 is attached to and supported by the detection target surface (see FIG. 15).

  When the support leg portion 31 and the fixed foot portion 32 are engaged to support the main body portion 20, when the shaft fixing screw 31 a in each support leg portion 31 is loosened little by little, the protruding shaft portion in the support leg portion 31. The main body portion 20 relatively approaches the fixed foot portion 32 side, that is, the detection object 80 side, by the bias of the spring 36 that tries to draw the tip end portion 35a of the 35 toward the main body portion side. And the position of the main-body part 20 with respect to the detection target object surface is decided because the edge part of the space | interval adjustment part 33 which protrudes on the mechanism part 22 outer side of the main-body part 20 contacts a detection target object surface (refer FIG. 16). That is, the main body 20 is fixed to the surface of the detection target, and the entire line scanner 10 is installed on the surface of the detection target.

  Thereafter, the output portion of the line scanner 10 is connected to the analysis means 50 installed near the detection target with a cable or the like. In addition, the line scanner 10 and the analyzing means 50 are appropriately connected to a power source to be operable.

Then, as a final adjustment, the line sensor 12 takes a trial image of a portion corresponding to the moving range of the line sensor on the surface of the detection target, and confirms a focus shift appearing in the obtained captured image. Thus, the operator also brings the tip of the protruding portion of the protrusion amount measuring device 25 corresponding to each interval adjusting portion 33 together with the interval adjusting portion 33 into contact with the surface of the object to be detected, and adjusts the interval from the indicated value of the protrusion amount measuring device 25. The amount of protrusion from the main body 20 side of each interval adjusting unit 33 is adjusted so as to eliminate the focus shift while making it possible to grasp the increase / decrease amount of the protrusion amount of the portion 33 (see FIG. 17). A series of procedures of correcting the position of the line sensor 12 with respect to the surface is repeated several times.
By adjusting the interval adjustment unit 33 a plurality of times, the main body unit 20 is appropriately positioned so that the surface of the detection target can be imaged by the line sensor 12 without defocusing.

  If the positional relationship between the movement path of the line sensor 12 and the preset detection range is slightly shifted based on the captured image obtained by the line sensor 12, the fixing screw 21a is used. To loosen the fixing of the mechanism portion 22 to the outer frame 21 and finely adjust the position of the mechanism portion 22 with respect to the outer frame 21 so that the positional relationship between the line sensor 12 and its detection range is appropriate. To do. Even when the line scanner 10 is installed on the surface of the object to be detected, the position of the mechanism portion 22 can be corrected, so that the engagement between the support leg portion 31 and the fixed foot portion 32 of the fixing means 30 is released for position adjustment. Thus, it is not necessary to move the main body 20 away from the detection object 80 and to start again from fixing the fixed foot part 32 to the surface of the detection object, and work can be carried out efficiently.

  When the prior adjustment is completed, as the actual displacement detection, the line sensor 12 images the surface of the detection target 80 while moving linearly based on the control of the control unit 17, and the data of the captured image forms the analysis unit 50. Input to the computer. After the imaging, when a predetermined time after which it can be considered that the strain state of the detection target has changed has passed, the line sensor 12 moves to take another image of the surface of the detection target 80 as described above, and the data of the captured image forms the analysis means 50 Input to the computer. Then, the analysis means 50 performs image analysis by the digital image correlation method on the two front and rear captured images, acquires the displacement of each part of the detection target surface, and further obtains the distortion of each part based on the displacement as necessary. If an image of the strain distribution is generated and displayed on the display constituting the display means 55, the observer sees the display means 55, recognizes the strain distribution on the surface of the detection object, and has a characteristic strain change different from the surroundings. It will be possible to discriminate the cracked portion that appears.

  As described above, in the displacement detection device according to the present embodiment, as the fixing means 30 for fixing the main body 20 of the line scanner 10 to the surface of the detection target 80, the support leg 31 protruding from the main body 20, and the detection target A fixed foot 32 attached to the object surface is provided, and the line scanner 10 is detected by engaging the support leg 31 from a direction different from the direction in which the load is applied to the fixed foot 32 fixed to the surface of the object to be detected. With the interval and orientation fixed with respect to the object 80, the surface of the detection object 80 is imaged twice by the line sensor 12, and the captured image is analyzed by the analysis means 50 using the digital image correlation method. Since the displacement of each point on the surface of the detection object is obtained, the imaging of the surface of the detection object can be appropriately advanced in a stable support state in which the line sensor 12 does not move in the imaging direction, and the solution of the captured image is solved. The can be performed accurately, it enhanced the accuracy of displacement detection. Further, the front end portion 35a of each support leg 31 can be inserted into the cutout portion 38b of the fixed foot portion 32 in the same direction at a time so that the main body portion 20 can be easily shifted to the support fixed state. The work efficiency related to the installation of 10 is also greatly improved.

  In the displacement detection device according to the above-described embodiment, the protrusion amount adjustment of the interval adjusting unit 33 is a manual type, and the protrusion amount measuring device 25 whose tip is brought into contact with the surface of the detection object in the same manner as the interval adjusting unit 33. The operator adjusts the protruding amount of each interval adjusting unit 33 while checking the indicated value. However, the present invention is not limited to this, and the interval adjusting unit automatically adjusts the protruding amount with respect to the main body unit with predetermined control. The control unit of the main body unit controls the adjustment mechanism of each interval adjustment unit to reduce the deviation by identifying the deviation of the focal length by performing a test image of the surface of the detection target with a line sensor. Thus, it is possible to automatically repeat the adjustment of the positional relationship between the main body and the surface of the detection object, and the surface of the detection object can be imaged by the line sensor without defocusing as in the above embodiment. As the state The detection accuracy can be ensured.

  Furthermore, if another measurement means for measuring the distance between the line sensor and the surface of the detection target is provided and the value of the distance at each part is acquired during test imaging, imaging with scanning of the line sensor in the main scanning direction is performed. At this time, and when moving in the sub-scanning direction, the adjustment mechanism of the interval adjustment unit is operated so that the adjustment that always optimizes the interval between the line sensor and the imaging position of the detection target is executed. It is also possible to cope with a case where the change in the distance between the line sensor and the surface of the detection object is significant due to the unevenness of the surface of the detection object.

  Further, in the displacement detection device according to the embodiment, the main body portion 20 is formed in a substantially rectangular shape so as to have a small difference in the size of each side. In order to widen the image sensor, the main body can be configured in another rectangular shape that is elongated in the sub-scanning direction of the line sensor to widen the movement range of the line sensor and increase the imaging range of the line sensor as it is. Detection area can be efficiently advanced by enlarging the possible surface area of the detection object.

  In the displacement detection apparatus according to the embodiment, the image captured by the line sensor 12 is analyzed using the analysis unit 50 that is separate from the line scanner 10, and displacement detection of each part of the surface of the detection target is executed. Although it is configured, not limited to this, if it is applied to a detection target that can be easily approached by an operator, the line scanner and analysis means can be combined together and supported and fixed together on the detection target It is also possible to adopt a configuration that is used as a single device, and the entire device can be made compact and easy to handle.

With the displacement detection apparatus of the present invention, detection was performed on a specimen that generated strain, and the obtained strain was compared with the value obtained with a strain gauge to evaluate the detection accuracy.
As the displacement detection apparatus of the present invention, the line scanner shown in the above embodiment and a personal computer that executes a digital image correlation method program as analysis means are used. The test object as a detection target was a square column of unreinforced concrete, and strain was generated by compressive loading with the line scanner fixed to the side surface. The compression loading is controlled based on the strain value obtained by the strain gauge attached to the surface of the test body, and the loading axial strain changes from 0 to 500 × 10 ⁻⁶ at 100 × 10 ⁻⁶ pitch, Furthermore, unloading was performed so that the strain would be the opposite change.
Then, at each stage of strain change, a surface image was obtained with a line scanner fixed to the specimen, and image analysis was performed with a computer as an analysis means to obtain a strain value.

  In order to compare differences in detection accuracy due to differences in support and movement mechanism of the line sensor, as another line scanner, there is one ball screw mechanism that moves the line sensor along the linear guide between two linear guides. The surface image of the test specimen was obtained in the same manner using a linear guide having a moving slider portion shorter than that of the apparatus of the present invention, and the strain value was obtained by image analysis.

First, an example (Example 1) in which distortion in the sub-scanning direction is detected by the apparatus of the present invention is compared with an example in which another line scanner is used as a comparative example (Comparative Example 1). Thus, the difference due to the difference in mechanism was evaluated.
The graph which shows the change of the distortion | strain obtained by analysis about Example 1 and Comparative Example 1 is shown in FIG. 19, FIG. 20, respectively.

In the example 1 detected by the apparatus of the present invention, the average error with the value (gauge value) obtained with the strain gauge is 6 × 10 ⁻⁶ and the maximum error is 18 × 10 ^−6. ing.
On the other hand, in Comparative Example 1, the average error with the value (gauge value) obtained with the strain gauge at the same time is 8 × 10 ⁻⁶ , and the maximum error is 24 × 10 ⁻⁶ .

  From the above, it can be said that the strain obtained by the apparatus of the present invention is a value that has no practical problem at both the loading stage and the unloading stage as compared with the gauge value. It can be seen that the distortion in the scanning direction can also be detected appropriately. In addition, it can be seen that the average error and the maximum error of Example 1 are both smaller than those of Comparative Example 1 and that the apparatus of the present invention having a structure in which the shake of the line sensor is less likely to occur can achieve high detection accuracy.

Next, an example (Example 2) in which the apparatus of the present invention is used to detect the distortion in the oblique 45 ° direction, which is a combined distortion of the distortion in the main scanning direction and the distortion in the sub-scanning direction, and the comparative example is described above. The difference was evaluated in the same manner as described above by comparing with an example (Comparative Example 2) in which detection was performed using another line scanner.
The graph which shows the change of the distortion | strain obtained by the analysis about Example 2 and the comparative example 2 is shown in FIG. 21, FIG.

In the example 2 detected by the apparatus of the present invention, the average error with the value (gauge value) obtained by the strain gauge at the same time is 10 × 10 ⁻⁶ and the maximum error is 34 × 10 ^−6. ing. On the other hand, in Comparative Example 2, the average error with the value (gauge value) obtained with the strain gauge at the same time is 19 × 10 ⁻⁶ and the maximum error is 35 × 10 ⁻⁶ .

  As in the case of the sub-scanning direction, the strain obtained by the apparatus of the present invention is a value that has no practical problem at both the loading stage and the unloading stage as compared to the gauge value, and the strain can be acquired appropriately. Recognize. In addition, both the average error and the maximum error of Example 2 are smaller than those of Comparative Example 2, and, as described above, high detection accuracy can be obtained with the apparatus of the present invention having a structure in which the line sensor is less likely to shake. I understand.

  Subsequently, in a loading test on a post-tensioned prestressed concrete (PC) T-girder removed from an actual bridge, the strain was obtained using the displacement detection device of the present invention, and the main strain distribution was calculated. A contour diagram of the main strain distribution was created. The obtained strain distribution diagram is shown in FIG.

  From the strain distribution diagram of FIG. 23, it can be said that the region where the strain is concentrated can be identified, and the crack occurrence position can be identified from the coincidence with the crack position on the actual detection target surface. For this reason, it turns out that it is fully applicable as an apparatus for the maintenance of a structure.

  As described above, the error from the strain gauge value obtained by the displacement detection device of the present invention is clearly smaller than that of the comparative example in which the line sensor is more likely to be shaken. It can be seen that when the mechanism has sufficient accuracy, strain can be obtained accurately, comparable to a strain gauge. Therefore, the displacement detection apparatus of the present invention that can stabilize the positional relationship between the line sensor and the surface of the detection object by appropriately fixing the line scanner to the detection object can accurately move the line sensor in the sub-scanning direction. It is clear that if it has a configuration that can be used, it can be easily acquired with the same accuracy as a strain gauge, and can be used for identification of crack positions, etc. .

DESCRIPTION OF SYMBOLS 1 Displacement detection apparatus 10 Line scanner 12 Line sensor 13 Linear guide 13a Slider part 13b Guide rail part 14 Ball screw mechanism 14a Nut part 14b Screw shaft part 15 Linear encoder 15a Detection part 15b Scale part 16 Motor 17 Control part 20 Main part 21 Outer Frame 21a Fixing screw 22 Mechanism part 22a Buffer material 25 Projection amount measuring device 30 Fixing means 31 Support leg part 31a Shaft fixing screw 32 Fixing foot part 33 Spacing adjustment part 35 Projection shaft part 35a Tip part 35b Small diameter part 36 Spring 37 Foot body Part 37a hole 37b female screw 38 foot surface part 38a male screw 38b notch part 38c groove part 39 elastic body 50 analysis means 55 display means 80 detection object

Claims (6)

In a displacement detection apparatus comprising: a line scanner that images a surface of a detection object with a line sensor; and an analysis unit that analyzes an image captured by the line scanner to obtain displacement or distortion of the detection object.
The line scanner has a main body part that supports the line sensor so as to be movable, and a fixing unit that fixes the main body part to the detection target.
The fixing means is
A support leg that is provided in a partially protruding state at a plurality of three or more locations of the main body, and is formed so that the tip of the protruding portion is larger than the other portions near the tip,
A plurality of fixed feet that are fixed to the surface of the object to be detected at a predetermined interval corresponding to the arrangement interval of the support legs in the main body, and that support the support legs by engaging with the protruding portion tips of the support legs. And
The fixed foot portion includes a notch portion that allows the protruding portion tip portion of the support leg portion to be inserted from other than the normal direction of the detection target surface at the fixed foot portion fixing position, and the notch portion. The other part in the vicinity of the front end of the support leg can be inserted and is smaller than the front end, and restrains the movement of the surface of the detection target in the normal direction relative to the fixed foot of the front end of the support leg. A groove and a hole,
The displacement detecting device, wherein the fixed foot portions are respectively fixed to the surface of the detection object, and the opening portions of the notches are directed in the same direction. The displacement detection device according to claim 1,
The fixed foot portion of the fixing means is provided with a foot main body portion fixed to the surface of the object to be detected, the notch portion and the groove portion, and is attached to the foot main body portion so that the orientation of the notch portion can be adjusted. A displacement detection device comprising a foot surface portion. In the displacement detection device according to claim 2,
The attachment of the foot surface portion of the fixed foot portion to the foot main body portion is by screwing around a screw shaft that coincides with the normal direction of the surface of the detection object,
An elastic body is provided between the foot main body portion and the foot surface portion so as to be in contact with both the foot main body portion and the foot surface portion when the foot surface portion is screwed into the foot main body portion and tightened. Displacement detection device. In the displacement detection device according to any one of claims 1 to 3,
The support leg portion of the fixing means has an urging means that urges the protruding portion tip portion in a direction to be pulled toward the main body portion side with respect to the main body portion, while being able to adjust the protruding amount of the protruding portion.
It is arranged at three or more places separated from each other so that the amount of protrusion can be adjusted in a direction parallel to the direction in which the line sensor images with respect to the main body, and the detection target is in the engaged state of the support leg and the fixed leg. A displacement detection device comprising: an interval adjustment unit that adjusts an interval between the main body unit and the detection target object surface by bringing an end portion into contact with the object surface. In the displacement detection device according to any one of claims 1 to 4,
The groove portion of the fixed foot portion in the fixing means has a tapered surface that tapers away from the surface of the detection object as a surface surrounding the groove,
The tip of the support leg is formed with a tapered surface that tapers as it approaches the main body. In the displacement detection device according to any one of claims 1 to 5,
The main body of the line scanner is
A line sensor comprising a plurality of guide rail portions arranged parallel to each other at a predetermined interval, and a plurality of slider portions that are slidably disposed on the guide rail portions and to which the line sensor is integrally attached. A plurality of linear guides that support linear movement in a direction perpendicular to the main scanning direction of the line sensor;
A linear motion mechanism that is integrally attached to the line sensor and moves the line sensor along a linear guide; and
The linear guides are arranged so as to be spaced apart from each other in a substantially symmetric arrangement across the center position in the main scanning direction of the line sensor,
A plurality of the linear motion mechanisms are arranged, and each movable part that moves together with the line sensor is connected to a predetermined position of the line sensor near the slider portion of each linear guide, and the line sensor is moved in synchronization with each other. Displacement detector characterized by