JP2022014100A - Data processing device, data processing program, recording medium and data processing method - Google Patents

Abstract

To provide a data processing device, a data processing program, a recording medium and a data processing method that can accurately measure a measurement object.SOLUTION: A data processing device comprises: an acquisition unit that acquires a displacement amount of a first point, on the basis of measurement data indicating a result of remotely measuring the first point on a measurement object from a predetermined installation point by a measuring instrument; and a calculation unit that calculates a displacement amount of a second point which is positioned at a position being different from the first point on the measurement object, on the basis of the acquired displacement amount of the first point and model data indicating a correlation relationship between the position and the displacement amount in the measurement object.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a data processing apparatus, a data processing program, a recording medium, and a data processing method.

From the viewpoint of safety management, structures such as tunnels, bridges, and buildings are inspected for cracks, deformation, vibration, and the like. For the inspection of the structure, for example, an image inspection device for analyzing an image of an inspected object, a measuring device using a laser or an ultrasonic wave, or the like is used. While these image inspection devices and measuring devices have an advantage that the inspection target can be inspected remotely and non-contactly, the inspection accuracy or the measurement accuracy decreases as the distance to the inspection target increases.

As a technique for improving the inspection accuracy or the measurement accuracy, for example, Patent Document 1 discloses a technique for reducing a measurement error by averaging the data of measurement points within a certain range. Patent Document 2 discloses a technique for improving measurement accuracy by measuring a measurement target a plurality of times from a plurality of positions.

Japanese Unexamined Patent Publication No. 2004-325209 Japanese Unexamined Patent Publication No. 2015-102399

In the technique described in Patent Document 1, the measurement error may not always be reduced because the measurement points set within the predetermined range may include the measurement points having low measurement accuracy. Similarly, in the technique described in Patent Document 2, when a measurement target is measured from a plurality of positions, there is a possibility that the plurality of positions include a position where the measurement accuracy is not high, so that the measurement error is not necessarily reduced. Is not always.

One aspect of the present disclosure is to provide a data processing apparatus, a data processing program, a recording medium, and a data processing method capable of accurately measuring a measurement target.

The data processing device according to one aspect of the present disclosure acquires the displacement amount of the first point based on the measurement data showing the result of the measuring device remotely measuring the first point on the measurement target from the predetermined installation point. The first point is different on the measurement target based on the acquisition unit, the displacement amount of the acquired first point, and model data showing the correlation between the position and the displacement amount in the measurement target. It is provided with a calculation unit for calculating the displacement amount of the second point at the position.

It is a figure which shows an example of the whole structure of a measurement system. It is a figure for demonstrating the installation place of a measuring device. It is a side view of a bridge. It is a figure for demonstrating the measurement state of FIG. 3A. It is a side view of a bridge. It is a figure for demonstrating the measurement state of FIG. 4A. It is a figure for demonstrating the amplitude measurement of a bridge girder. It is a figure for demonstrating the amplitude measurement of a bridge girder. It is a flowchart of the main process in 1st Embodiment. It is a graph of model data for analyzing the amplitude of a bridge girder. It is a flowchart of the main process in 2nd Embodiment. It is a side view of the bridge which is the object of measurement. It is a graph of model data for analyzing the amplitude of a bridge girder. It is a side view of a cantilever structure. It is a figure for demonstrating the measurement state of FIG. 10A. It is a side view of a cantilever structure. It is a figure for demonstrating the measurement state of FIG. 11A. It is a side view of a cantilever structure. This is an example of the measurement accuracy screen. This is an example of the measurement accuracy screen.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

<First Embodiment>
[Measurement system configuration]
The first embodiment of the present disclosure will be described. The physical configuration and the electrical configuration of the measurement system 100 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing an example of the overall configuration of the measurement system 100. FIG. 2 is a diagram for explaining an installation location of the measuring device 130.

As shown in FIG. 1, the measurement system 100 includes a data processing device 110 and a measuring device 130. The data processing device 110 is a computer capable of executing various types of data processing. The measuring device 130 is an electronic device capable of remotely measuring a measurement target 150 located at a position away from the measuring device 130. The measuring device 130 is communicably connected to the data processing device 110 by a wired or wireless network. The measuring device 130 transmits the measurement data indicating the measurement result of the measurement target 150 to the data processing device 110.

The measuring device 130 measures the measurement target 150 for a predetermined measurement type (for example, length, area, volume, three-dimensional coordinates, distance to the measurement target 150, etc. of the measurement target 150). The configuration of the measuring device 130 differs depending on the measurement type. For example, the measuring device 130 can apply a laser measuring device including a laser output unit and a laser receiving unit as the measuring unit. The laser output unit outputs a laser to the measurement target 150, and the laser light receiving unit detects the reflection of the laser from the measurement target 150. The control unit of the measuring device 130 analyzes the output and detection of the laser, and generates and outputs measurement data indicating the distance to the measurement target 150.

For example, the measuring device 130 can apply an image measuring device including an image pickup element as a measuring unit. The control unit of the measuring device 130 analyzes the image taken by the image pickup element, and generates and outputs measurement data indicating the length, area, volume, three-dimensional coordinates, or distance to the measurement target 150 of the measurement target 150. do.

The first embodiment illustrates the case where the measuring device 130 is a laser measuring device. The measuring device 130 may be provided in the data processing device 110. In this case, the control unit 111 of the data processing device 110 may generate and output the measurement data by analyzing the measurement result of the measurement target 150 by the measurement unit.

The data processing device 110 includes a control unit 111, a storage unit 112, a communication unit 113, an input unit 114, a display unit 115, and the like. The control unit 111 includes, for example, a CPU, RAM, ROM, etc., and controls the data processing device 110. The control unit 111 may be an MCU, an MPU, or the like. The storage unit 112 is a non-transient storage medium capable of storing programs and data, and is, for example, a non-volatile memory such as a hard disk drive or a flash memory. The communication unit 113 is a communication interface for executing data communication with an external device including the measuring device 130. The input unit 114 is an input interface that accepts user operations, and is, for example, a keyboard, a touch panel, a mouse, or the like. The display unit 115 is a display capable of displaying various information.

The user can use the input unit 114 to perform various operations related to the measurement operation of the measuring device 130 and the data processing of the data processing device 110, and input data necessary for these measurement operations and data processing. Various information related to these measurement operations and data processing (for example, measurement data, setting information described later, analysis results, etc.) is stored in the storage unit 112. The display unit 115 can display various types of information.

By executing the program stored in the storage unit 112 by the control unit 111, each functional block illustrated in FIG. 1 is realized. These functional blocks include an acquisition unit 121, a calculation unit 122, a setting unit 123, and an output unit 124.

The acquisition unit 121 acquires the displacement amount of the first point based on the measurement data showing the result of the measuring device 130 remotely measuring the first point on the measurement target 150 from the predetermined installation point. The calculation unit 122 sets the position on the measurement target 150 different from that of the first point based on the acquired displacement amount of the first point and the model data showing the correlation between the position and the displacement amount in the measurement target 150. The amount of displacement at a certain second point is calculated. The setting unit 123 sets the model data based on the setting information necessary for calculating the displacement amount of the second point. The output unit 124 outputs the displacement amount of the second point calculated by the calculation unit 122 to the display unit 115 or the like. Specific processing modes of these functional blocks will be described later.

[Installation point of measuring equipment]
As shown in FIG. 2, the measurement target 150 of the first embodiment is a bridge that supports the bridge girder 151 with a plurality of piers 152. In FIG. 2, the extending direction of the bridge girder 151 is the x direction of the measuring device 130, the width direction of the bridge girder 151 is the y direction of the measuring device 130, and the extending direction of each pier 152 is the z direction of the measuring device 130.

The measuring device 130 is installed to measure the amplitude, which is the displacement amount of the bridge girder 151 in the z direction, as the displacement amount of the measurement target 150. The direction in which the amount of displacement occurs at the measurement point of the measuring device 130 is called the displacement direction. Therefore, the displacement direction of the measurement point in the bridge girder 151 is the z direction. When vibration occurs in the measurement target 150, vibration of a plurality of standing waves having different wavelengths may occur in the bridge girder 151. In this example, a case of analyzing the vibration of a standing wave in which the center point 212 in the x direction of the bridge girder 151 is the antinode of the vibration and the end points 211 and 213 in the x direction of the bridge girder 151 are the nodes of the vibration will be described.

In this example, since the measuring device 130 measures the measurement target 150 from below, the measuring device 130 is installed below the measurement target 150. However, when the measurement target 150 hangs on a river or a valley, the position where the measurement device 130 can be physically installed is limited. In the example shown in FIG. 2, of the areas below the measurement target 150, the area below the center point 212 of the bridge girder 151 is the non-installable area 202 in which the measuring device 130 cannot be installed. Of the areas below the measurement target 150, the areas on both sides of the non-installable area 202 are the installable areas 201 in which the measuring device 130 can be installed.

In order to know the maximum amplitude of the bridge girder 151 when the measurement target 150 vibrates, it is preferable to measure the central point 212 which is the antinode of the vibration. On the other hand, in the present embodiment, the installable area 201 is farther from the central point 212 than the non-installable area 202. In the measuring device 130, the closer the measuring point is, the higher the measurement accuracy is usually. Therefore, when the central point 212 is measured from the installable area 201, the measurement error of the measuring device 130 may be larger than when the central point 212 is measured from the non-installable area 202.

[Position relationship between installation point and measurement point]
The influence of the positional relationship between the installation point of the measuring device 130 and the measuring point of the measuring target 150 on the measurement error of the measuring device 130 will be described. FIG. 3A is a side view of the bridge. FIG. 3B is a diagram for explaining the measurement state of FIG. 3A. FIG. 4A is a side view of the bridge. FIG. 4B is a diagram for explaining the measurement state of FIG. 4A. The state in which the measurement target 150 is viewed in the y-axis direction is the side view of the measurement target 150.

In the example shown in FIG. 3A, the measuring device 130 installed at the installation point P0 measures the point 301 in the bridge girder 151 located near the end point 211. The installation point P0 is the position where the distance from the point 301 is the shortest in the installable area 201. For convenience of explanation, the installation point P0 is assumed to be synonymous with the position of the laser ejection port provided at the tip of the measuring instrument 130. The measuring device 130 measures the distance to the point 301 by irradiating the laser from the installation point P0 toward the point 301. At this time, as shown in FIG. 3B, the laser of the measuring device 130 extends the distance D31 from the installation point P0 to the point 301 in the z direction. The laser of the measuring device 130 is irradiated substantially perpendicular to the point 301 on the measurement target surface of the bridge girder 151 in a side view.

In the example shown in FIG. 4A, the measuring device 130 installed at the installation point P0 measures the point 401 of the bridge girder 151 at the same position as the center point 212. That is, the measuring device 130 measures the distance to the point 401 by irradiating the laser from the same installation point P0 as in FIG. 3A toward the point 401. At this time, as shown in FIG. 4B, the laser of the measuring instrument 130 extends the distance D41 from the installation point P0 to the point 401 inclining from the z direction. The distance D41 is larger than the distance D31. The laser of the measuring device 130 irradiates the point 401 on the measurement target surface of the bridge girder 151 at an acute angle with the measurement target surface in a side view.

The direction in which the measuring device 130 measures the measurement target 150 remotely is called the measuring direction of the measuring device 130. The laser measuring device has a characteristic that the error range in the measuring direction, which is the irradiation direction of the laser, is small. Therefore, the measuring device 130 of this example is suitable for measuring the distance from the measuring device 130 to the measurement target 150, and the distances D31 and D41 can be measured with high accuracy. However, the laser of the measuring instrument 130 spreads radially with respect to the optical axis as the distance from the installation point P0 increases. That is, as shown in FIGS. 3B and 4B, the farther the laser is from the installation point P0, the larger the permissible range 131 of the laser. The larger the allowable range 131, the higher the possibility that a measurement error will occur as described below.

For example, since the laser of the measuring instrument 130 has a spread that is inclined by ± θ / 2 in the radial direction from the optical axis, the permissible range 131 becomes larger as the distance from the installation point P0 increases. In the example shown in FIG. 3B, the optical axis of the laser is positioned at the point 301. At this time, the allowable measurement range 131 of the laser irradiates the region including the point 301 in the measurement target surface of the bridge girder 151. At this time, if the measuring device 130 measures the distance to another point included in the permissible range 131 instead of the distance D31 to the point 301, a measurement error may occur.

In the example shown in FIG. 3B, the region irradiated with the allowable range 131 on the measurement target surface includes points 302 and 303 at both ends of the point 301. Points 302 and 303 are the points farthest from the point 301 within the allowable range 131. Points 302 and 303 are farther from the installation point P0 than point 301. That is, the distance D32 between the installation point P0 and the point 302 and the distance D33 between the installation point P0 and the point 303 are both larger than the distance D31.

The point where the distance is actually measured in the allowable range 131 is called the actual measurement point. The farther the measured point is from the point 301 within the allowable measurement range 131, the larger the measurement error with respect to the distance D31. When the actually measured points are points 302 and 303, the measurement error with respect to the distance D31 becomes maximum. The measurement error when the measured point is the point 302 is represented by the difference between the distances D31 and D32. The measurement error when the measured point is the point 303 is represented by the difference between the distances D31 and D33. In this example, the measurement error with respect to the distance D31 is substantially equal regardless of whether the measured points are points 302 and 303.

In the example shown in FIG. 4B, the region irradiated with the allowable range 131 on the measurement target surface includes the point 402 closest to the installation point P0 and the point 403 farthest from the installation point P0. Points 402 and 403 are the points farthest from point 401 within the allowable range 131. Point 402 is closer to the installation point P0 than point 401. That is, the distance D42 between the installation point P0 and the point 402 is smaller than the distance D41. Point 403 is farther from installation point P0 than point 401. That is, the distance D42 between the installation point P0 and the point 402 is larger than the distance D41.

The farther the measured point is from the point 401 within the allowable measurement range 131, the larger the measurement error with respect to the distance D41. When the actually measured points are points 402 and 403, the measurement error with respect to the distance D41 becomes the maximum. The measurement error when the measured point is the point 402 is represented by the difference between the distances D41 and D42. The measurement error when the measured point is the point 403 is represented by the difference between the distances D41 and D43. In this example, the measurement error with respect to the distance D41 is substantially equal regardless of whether the measured points are points 402 and 403.

As shown in FIGS. 3A and 3B, when the measurement target 150 is irradiated with the laser substantially vertically, the difference between the distance D31 and the distance D32 and the difference between the distance D31 and the distance D33 are both relatively small. Therefore, the maximum measurement error that occurs within the permissible range 131 is also relatively small. On the other hand, as shown in FIGS. 4A and 4B, when the measurement target 150 is irradiated with the laser tilted, the difference between the distance D41 and the distance D42 and the difference between the distance D31 and the distance D43 are both relatively relative. Due to its large size, the maximum measurement error that occurs within the permissible range 131 is also relatively large. In order to reduce the measurement error of the laser measuring device, it is necessary to irradiate the measurement target 150 with the laser substantially perpendicularly so that the incident angle of the laser with respect to the measurement target 150 becomes small.

Even when the measuring device 130 can irradiate the laser to only one point of the measurement point, the measurement point generated when the optical axis of the laser is tilted by a predetermined angle as the distance between the installation point P0 and the measurement point increases. The misalignment of is large. Therefore, even with such a measuring device 130, the measurement is performed so that the distance between the installation point P0 and the measurement point becomes smaller and the incident angle of the laser with respect to the measurement target 150 becomes smaller, as described above. It is preferable to irradiate the target 150 with the laser substantially perpendicularly.

[Measurement mode of measurement target]
As described above, it is preferable to measure the center point 212 in order to know the maximum amplitude of the bridge girder 151. In the present embodiment, since the measuring device 130 cannot be installed in the non-installable area 202 close to the central point 212, it is installed at the installation point P0 in the installable area 201 far from the central point 212 (see FIG. 2). In this case, the laser irradiation direction with respect to the bridge girder 151 is slanted, and the distance between the installation point P0 and the center point 212 is relatively large. Therefore, if the measuring device 130 directly measures the center point 212, the measurement error becomes large. There is a possibility (see FIGS. 4A and 4B). Therefore, the measuring device 130 at the installation point P0 irradiates the bridge girder 151 with a laser perpendicularly, and in order to make the distance between the installation point P0 and the measurement point smaller, the point 301 located near the installation point P0. (See FIGS. 3A and 3B).

A mode in which the measuring device 130 measures the measurement target 150 will be described. 5A and 5B are diagrams for explaining the amplitude measurement of the bridge girder 151. In the example shown in FIGS. 5A and 5B, the measuring device 130 irradiates a laser from directly below the bridge girder 151 to a point 301, which is a measurement point above the installation point P0, to perform fixed point measurement, and from the installation point P0. The measurement data indicating the distance to the point 301 is output over time.

When vibration occurs in the bridge which is the measurement target 150, the bridge girder 151 oscillates in the vertical direction according to the vibration. As shown in FIG. 5A, when the bridge girder 151 bends most downward, the point 301 is displaced most downward. The measurement data output from the measuring device 130 at this time indicates the distance D51. The distance D51 is the minimum value from the installation point P0 to the point 301. As shown in FIG. 5B, when the bridge girder 151 bends most upward, the point 301 is displaced most upward. The measurement data output from the measuring device 130 at this time indicates the distance D52. The distance D52 is the maximum value from the installation point P0 to the point 301.

The acquisition unit 121 (see FIG. 1) calculates and acquires the displacement amount of the point 301 based on a plurality of measurement data indicating the values measured by the measuring device 130 at a plurality of different times. Specifically, the acquisition unit 121 acquires the maximum amplitude of the point 301 at the time of vibration of the measurement target 150 by calculating the difference between the distances D51 and D52 specified based on the measurement data.

[Embodiment of main treatment]
With reference to FIGS. 6 and 7, various processes executed by the measurement system 100 of the first embodiment will be described. FIG. 6 is a flowchart of the main process in the first embodiment. FIG. 7 is a graph 700 of model data for analyzing the amplitude of the bridge girder 151. The control unit 111 of the data processing device 110 executes the main processing flow shown in FIG. 6 based on the program stored in the storage unit 112.

As shown in FIG. 6, the acquisition unit 121 acquires the measurement data of the first point (S601). The first point is one point (measurement point) on the measurement target 150 measured by the measuring device 130. The acquisition unit 121 calculates the displacement amount of the first point based on the measurement data of the first point (S603). The setting unit 123 acquires the setting information necessary for analyzing the displacement of the measurement target 150 (S605). For example, the setting unit 123 may acquire the setting information input by the user using the input unit 114 or the setting information previously stored in the storage unit 112.

The setting information includes a specific displacement pattern, structural information of the measurement target 150, a position of a first point, a position of a second point, and the like. The specific displacement pattern is a displacement pattern applicable to the structural features or specifications of the measurement target 150. The displacement pattern is a mathematical formula that expresses the relationship between the position and displacement of a structure in a patterned manner. The structural information of the measurement target 150 is information regarding a specific structure that affects the displacement of the measurement target 150.

For example, the user checks the position of the measurement point on the measuring device 130 in advance and sets the position to the position of the first point. The second point is one point (analysis point) on the measurement target 150 for calculating the displacement amount without measuring with the measuring device 130. The user can arbitrarily set the position of the second point to specify the point at which the data processing device 110 analyzes the displacement. In this example, the positional relationship between the first point and the second point set by the user is that the second point is farther from the installation point P0 than the first point.

The setting unit 123 sets model data showing the correlation between the position and the displacement amount in the measurement target 150 based on the acquired setting information (S607). The model data is generated by applying the structural information of the measurement target 150 and the position and displacement amount of the first point to a specific displacement pattern. That is, the model data is a specific displacement model in which a specific displacement pattern is applied to the measurement target 150.

The calculation unit 122 calculates the displacement amount of the second point based on the set model data (S609). Specifically, the calculation unit 122 calculates the displacement amount corresponding to the position of the set second point based on the model data. The output unit 124 outputs the calculated displacement amount of the second point to the display unit 115 or the like as an analysis result (S611). After that, the main process is terminated.

A specific processing mode of the above-mentioned main processing will be described. The measurement system 100 of this example measures the amplitude of the bridge girder 151 as the displacement of the measurement target 150. For example, the user sets the above-mentioned point 301 as the first point and the center point 212 as the second point. In this case, as shown in FIGS. 5A and 5B, the measuring device 130 measures the point 301 from the installation point P0, but does not measure the center point 212. The data processing device 110 analyzes the amplitude of the center point 212 based on the measurement data of the point 301.

For the first and second points, when the measuring device 130 measures the first and second points from the installation point P0, the measurement error of the displacement amount of the first point is the displacement amount of the second point. They are arranged in a positional relationship that is smaller than the measurement error. For example, the first point and the second point are arranged so that the distance between the first point and the installation point P0 is smaller than the distance between the second point and the installation point P0. Further, for example, the first point and the second point are arranged so that the incident angle of the laser with respect to the first point is smaller than the incident angle of the laser with respect to the second point. In other words, the angle (for example, 90 degrees) that the direction from the installation point P0 toward the first point forms with the surface of the measurement target 150 at the first point is the direction from the installation point P0 toward the second point at the second point. It is larger than the angle formed by the surface of the measurement target 150 (for example, less than 90 degrees). In this example, the distance D31 between the installation point P0 and the point 301 (see FIG. 3B) is smaller than the distance D41 between the installation point P0 and the point 401 (that is, the center point 212) (see FIG. 4B) and with respect to the point 301. The incident angle of the laser is smaller than the incident angle of the laser with respect to the point 401. Therefore, the measurement error of the point 301 is smaller than the measurement error when the center point 212 is measured.

In this case, the acquisition unit 121 acquires the measurement data of the point 301 (S601), and calculates the difference between the distances D51 and D52 as the maximum amplitude of the point 301 as described above (S603). The setting unit 123 inputs setting information including, for example, a specific displacement pattern, structural information of the measurement target 150, a position of a first point (point 301), a position of a second point (center point 212), and the like, which are input by a user. Acquire (S605).

For example, as the specific displacement pattern, as the vibration pattern of the bridge girder 151, a formula of a standing wave having two adjacent nodes as a half cycle and an antinode as a peak is shown. The structural information of the measurement target 150 indicates the positions of the antinodes and nodes when the bridge girder 151 is vibrated. include. The position of the first point is the x-coordinate of the point 301. The position of the second point is the x-coordinate of the center point 212. In this example, the x-coordinate of the end point 211 is "0". The x-coordinates of the end point 213, the center point 212, and the point 301 are larger than "0".

The setting unit 123 sets model data for analyzing the amplitude of the bridge girder 151 based on the acquired setting information (S607). As an example, the set model data is expressed by the following formula.
A (x) = A × sin (π × x / L) ... (Equation 1)
In (Equation 1), the variable x is an arbitrary x coordinate in the bridge girder 151. The variable A (x) is the maximum amplitude corresponding to the variable x. A is the maximum amplitude corresponding to the x-coordinate of the antinode of vibration. L is the length of the bridge girder 151 in the x direction.

The graph 700 shown in FIG. 7 is a two-dimensional graph showing the model data of (Equation 1) with the x-direction as the horizontal axis and the z-direction as the vertical axis. As shown in the graph 700, (Equation 1) corresponds to the structural information of the measurement target 150, and has a wavelength of 2 L (that is, a half cycle L) in which the end points 211 and 213 are the vibration nodes and the center point 212 is the antinode of the vibration. ) Represents a standing wave. The maximum amplitude corresponding to the x-coordinates of the endpoints 211 and 213 is the variable A (x) = 0. The maximum amplitude corresponding to the x-coordinate of the center point 212 is the variable A (x) = A.

The setting unit 123 sets the distance between the two points of the endpoints 211 and 213 to L of (Equation 1) based on the structural information of the measurement target 150. The setting unit 123 substitutes the position of the first point (point 301) included in the setting information into the variable x of (Equation 1). The setting unit 123 substitutes the maximum amplitude of the first point (point 301) calculated in S603 into the variable A (x) of (Equation 1). As a result, in (Equation 1), A, which is the maximum amplitude of the vibration antinode (center point 212), is calculated. The setting unit 123 sets the calculated A to (Equation 1).

The calculation unit 122 calculates the displacement amount of the second point based on the model data (Equation 1) in which constants are set for A and L (S609). That is, the calculation unit 122 inputs the position of the second point into the variable x of (Equation 1) to obtain the variable A (x) indicating the maximum amplitude of the second point (center point 212). The output unit 124 outputs the calculated maximum amplitude of the center point 212 to the display unit 115 or the like as an analysis result (S611). As a result, the user can recognize the maximum amplitude of the center point 212 that has not been measured by the measuring device 130.

The analysis method using the model data of (Equation 1) described above has a maximum amplitude A (x) at an arbitrary first point (measurement point) and a maximum amplitude A (x) at an arbitrary second point (analysis point). It is synonymous with finding the ratio r with x) and multiplying the maximum amplitude A (x) of the first point by the ratio r to find the maximum amplitude A (x) of the second point. Therefore, in theory, the multiple of the measurement error included in the maximum amplitude A (x) of the first point multiplied by the ratio r is the error between the maximum amplitude A (x) of the second point and the actual maximum amplitude. ..

In this example, as shown in FIGS. 6A and 6B, at the first point of the measuring device 130, the laser is vertically irradiated from the installation point P0 to the measurement target 150, and the distance between the installation point P0 and the first point is It is set to the point 301 closest to the installation point P0 in the bridge girder 151 so as to be small. As described above, the smaller the incident angle of the laser with respect to the measurement target 150 having the measurement point and the smaller the distance between the installation point P0 and the measurement point, the more the measurement error of the measurement point is suppressed. Therefore, even if the measurement error of the first point (measurement point) is multiplied by the ratio r, the error of the second point (analysis point) can be suppressed to the minimum.

As described above, for example, in order to know the maximum amplitude of the bridge girder 151 with the measuring instrument 130, it is desirable to directly measure the center point 212. However, if the measuring device 130 can be installed only at a position far away from the center point 212, the angle of incidence of the laser on the bridge girder 151 where the center point 212 is located is large, and the distance between the measuring device 130 and the center point 212 is large. As mentioned above, the measurement error also increases.

In the first embodiment, the measurement point (point 301) is set at a position of the bridge girder 151 that is closer to the installation point P0 and the angle of incidence of the laser is smaller, and the analysis point (center) is based on the displacement amount of the measurement point. The displacement amount of the point 212) is calculated. As a result, the displacement amount of the second point can be calculated more accurately than in the case of directly measuring an arbitrary second point on the measurement target 150. For example, the maximum amplitude of the bridge girder 141 can be calculated more accurately than in the case of directly measuring the center point 212.

<Second embodiment>
The second embodiment of the present disclosure will be described. In each of the following embodiments, the configurations and processes having substantially the same functions as those of the first embodiment will be referred to by a common reference numeral, and the description thereof will be omitted, and only the points different from those of the first embodiment will be described. FIG. 8 is a flowchart of the main process in the second embodiment. FIG. 9A is a side view of the bridge. FIG. 9B is a graph 900 of model data for analyzing the amplitude of the bridge girder 151.

In the first embodiment described above, the displacement amount of the analysis point is calculated based on the positional relationship between the measurement point (first point) and the analysis point (second point), but the exact position between the measurement point and the analysis point is calculated. The relationship is not always known. Therefore, in the second embodiment, the bridge is measured and analyzed in the same manner as in the first embodiment, but the displacement amount of the analysis point is calculated based on the displacement amount of the plurality of measurement points. For example, among the measurement targets 150, a plurality of measurement points whose measurement error is smaller than the measurement error when the analysis points are measured are set, and the analysis points are set based on the positional relationship and the displacement amount of these measurement points. Calculate the amount of displacement.

The main process executed by the measurement system 100 of the second embodiment will be described with reference to FIG. As shown in FIG. 8, the acquisition unit 121 acquires measurement data of a plurality of first points having different positions from each other (S801). The acquisition unit 121 calculates the displacement amount of the plurality of first points based on the measurement data of the plurality of first points (S803). Subsequent processes (S605 to S611) are the same as those in the first embodiment.

A specific processing mode of the above-mentioned main processing will be described. The measurement system 100 of this example measures the amplitude of the bridge girder 151 as the displacement of the measurement target 150. For example, the user sets three points 901, 902, and 903 located near the end points 211 as the first point, and sets the center point 212 as the second point. In this case, as shown in FIG. 9A, the measuring device 130 measures the points 901, 902, and 903 from the installation point P0, but does not measure the center point 212. The data processing device 110 analyzes the maximum amplitude of the center point 212 based on the measurement data of the points 901, 902, and 903.

As in the first embodiment, when the measuring device 130 measures the first point and the second point from the installation point P0, the measurement error of the displacement amount of the first point is obtained in each of the plurality of first points. Is arranged in a positional relationship that is smaller than the measurement error of the displacement amount at the second point. For example, the points 901, 902, and 903 are all closer to the installation point P0 than the center point 212 so that the incident angle of the laser with respect to the bridge girder 151 is smaller than that of the center point 212, and they are close to each other on the measurement target 150. Placed in different positions.

In this case, the acquisition unit 121 acquires the displacement amounts of the plurality of first points based on the plurality of measurement data indicating the results of remote measurement of the plurality of first points (S801, S803). For example, the acquisition unit 121 acquires the measurement data of the points 901, 902, and 903 and calculates the maximum amplitudes thereof. The setting unit 123 acquires the setting information (S605). For example, the specific displacement pattern included in the setting information indicates a standing wave, which is a vibration pattern of the bridge girder 151, as in the first embodiment (see FIG. 7). The setting unit 123 sets the model data of (Equation 1) based on the setting information (S607).

In this example, since the setting information does not include the structural information of the measurement target 150, the exact positions of the nodes and the abdomen in the vibration of the bridge girder 151 are unknown. That is, the length L of the bridge girder 151 in (Equation 1) cannot be specified. Therefore, it is not possible to realize the method of the first embodiment in which the measurement result of one measurement point is applied to (Equation 1) to calculate the maximum amplitude of the analysis point (for example, the antinode of vibration). Therefore, in the second embodiment, the setting unit 123 sets the model data as follows.

The graph 900 shown in FIG. 9B is a two-dimensional graph showing the model data of (Equation 1) in the same manner as in FIG. 7. As shown in Graph 900, the x-coordinates of the points 901, 902, and 903 are x1, x2, and x3, respectively. The maximum amplitudes of points 901, 902, and 903 calculated in S803 are z1, z2, and z3, respectively. In the graph 900, the length L of the bridge girder 151, the antinodes of vibration, the positions of the nodes, and the like are unknown.

The setting unit 123 substitutes the maximum amplitude of the plurality of first points (points 901, 902, 903) calculated in S803 into (Equation 1). As a result, the following mathematical formulas can be obtained for points 901, 902, and 903.
z1 = A × sin (π × x1 / L) ... (Equation 2)
z2 = A × sin (π × x2 / L) ... (Equation 3)
z3 = A × sin (π × x3 / L) ... (Equation 4)
At this point, A, L, x1, x2, and x3 contained in (Equation 2) to (Equation 4) are unknown.

In (Equation 2) to (Equation 4), for example, if two of the positions (x1, x2, x3) of a plurality of first points are known, there are three unknown variables including A and L. , All unknown variables can be calculated. Therefore, in S605, the setting unit 123 acquires, for example, the positions of at least two first points input by the user and assigns them to at least two of x1, x2, and x3. As a result, the setting unit 123 calculates all unknown variables including A and L, and sets the calculated A and L to (Equation 1).

Similar to the first embodiment, the calculation unit 122 is based on the position of the second point (center point 212) acquired in S605 and the model data in which constants are set for A and L (Equation 1). The maximum amplitude of the two points is calculated (S609). By outputting the calculated maximum amplitude of the center point 212 (S611), the output unit 124 can recognize the maximum amplitude of the center point 212. In this example, since the center point 212 is the antinode of vibration, the user can recognize the maximum amplitude of the bridge girder 151.

If the mutual distance between the plurality of first points is known, one position among the plurality of first points can be used to represent the remaining position. For example, the position of the point 902 can be represented by the position of the point 901 and the distance α between the points 901 and 902 as shown in (Equation 5) below. The position of the point 903 can be represented by the position of the point 901 and the distance β between the points 901 and 903 as shown in (Equation 6) below.
x2 = x1 + α (α is known) ... (Equation 5)
x3 = x1 + β (β is known) ... (Equation 6)

As a result, one unknown variable (x1) can be reduced with respect to the positions of the plurality of first points. In this case, by combining (Equation 2) to (Equation 6), two unknown variables x2 and x3 can be reduced, so that the remaining unknown variables are x1, A, and L. Therefore, the setting unit 123 can calculate all unknown variables including A and L without acquiring the positions of a plurality of first points in S605, and sets the calculated A and L to (Equation 1). can.

As described above, in the second embodiment, a plurality of measurement points (points 901, 902, 903) are set at positions where the incident angle of the laser from the installation point P0 is small and the position closer to the installation point P0 in the bridge girder 151. The displacement amount of the analysis point (center point 212) is calculated based on the displacement amount of these plurality of measurement points. As a result, as in the first embodiment, the displacement amount of the second point (for example, the maximum amplitude of the bridge girder 151) is compared with the case of directly measuring an arbitrary second point (for example, the center point 212) on the measurement target 150. Can be calculated accurately.

The plurality of measurement points is not limited to three, and may be at least two. The positions of the plurality of first points (measurement points) are not limited to the above positions, and may be positions different from each other on the measurement target 150. Therefore, the positions and quantities of the plurality of first points may be any positions and quantities suitable for accurately calculating the displacement amount of the second point (analysis point). When three or more first points are set, for example, even if the position of the second point or the length of the bridge girder 151 is unknown, the maximum amplitude during vibration, the position of the antinode, the wavelength, etc. can be calculated. ..

<Third embodiment>
A third embodiment of the present disclosure will be described. FIG. 10A is a side view of the cantilever structure. FIG. 10B is a diagram for explaining the measurement state of FIG. 10A. FIG. 11A is a side view of the cantilever structure. 11B is a diagram for explaining the measurement state of FIG. 11A.

As shown in FIG. 10A, the measurement target 150 of the third embodiment is a cantilever structure in which the roof 1001 is supported by the columns 1002, and is, for example, a spectator seat in a sports stadium. In FIG. 10A, the direction in which the roof 1001 protrudes from the support column 1002 is the x direction of the measuring device 130, the width direction of the roof 1001 is the y direction of the measuring device 130, and the extending direction of the support column 1002 is the z direction of the measuring device 130. Is. One end of the roof 1001 in the x direction is a fixed end 1011 fixed to the support column 1002. The other end of the roof 1001 in the x direction is the free end 1012. In this example, the lower part of the support column 1002 is the installable area 201, and the lower part of the free end 1012 is the non-installable area 202 (see FIG. 2).

It is known that concrete, which is one of the materials used for buildings, contains a large amount of water immediately after construction, so that it dries and shrinks with the passage of time. Although the shrinkage of concrete itself is an expected change, if the shrinkage progresses more than expected, there may be safety management problems such as cracks in the concrete. By measuring the degree of deformation of concrete, measurement data can be used for safety management, such as predicting the occurrence of danger in advance.

In the present embodiment, the measuring device 130 is installed to measure the shrinkage width, which is the displacement amount in the x direction of the roof 1001, as the displacement amount of the measurement target 150. Therefore, the displacement direction of the measurement point on the roof 1001 is the x direction. As an example, the measuring device 130 is an image measuring device having a stereo camera as a measuring unit. The measurement direction of the stereo camera is the shooting direction in which the measurement target 150 is imaged from the installation point P0. The control unit of the measuring device 130 analyzes the captured image of the stereo camera and generates and outputs measurement data indicating the three-dimensional coordinates of the measurement target 150.

In order to know the contraction width of the roof 1001, it is preferable to measure the free end 1012 having the largest displacement during contraction. On the other hand, in the present embodiment, the installable area 201 is farther from the free end 1012 than the non-installable area 202. Therefore, when the free end 1012 is measured from the installable area 201, the measurement error of the measuring device 130 may be larger than that when the free end 1012 is measured from the non-installable area 202.

The influence of the positional relationship between the installation point of the measuring device 130 and the measuring point of the measuring target 150 on the measurement error of the measuring device 130 will be described. In the example shown in FIG. 10A, a case where the measuring device 130 installed at the installation point P0 measures the point 1000 at the position close to the fixed end 1011 in the roof 1001 is shown. The measuring device 130 measures the three-dimensional coordinates of the point 1000 by photographing the point 1000 from the installation point P0 with a stereo camera. The installation point P0 is the position where the distance from the point 1000 is the shortest in the installable area 201. As shown in FIG. 10B, the photographing range of the measuring device 130 extends in the z direction from the installation point P0 toward the point 1000.

FIG. 11A shows a case where the measuring device 130 installed at the installation point P0 measures the point 1100 in the roof 1001 at the same position as the free end 1012. That is, the measuring device 130 measures the three-dimensional coordinates of the point 1100 by photographing the point 1100 from the same installation point P0 as in FIG. 10A with a stereo camera. As shown in FIG. 11B, the photographing range of the measuring device 130 extends from the installation point P0 toward the point 1100 at an angle from the z direction. The distance D111 between the installation point P0 and the point 1100 is larger than the distance D101 between the installation point P0 and the point 1000 (see FIG. 10A).

The measurement error when measuring 3D coordinates with a stereo camera is affected by the focal length of the lens, the baseline length that is the distance between the cameras, the distance to the measurement target 150, the pixel size of the camera, the image quality of the captured image, etc. .. In the following, a case where the measurement error in the shooting direction of the stereo camera is larger than the measurement error in the direction perpendicular to the shooting direction will be described. As shown in FIGS. 10B and 11B, as the shooting range of the stereo camera is farther from the installation point P0, the target range in which a measurement error occurs with respect to the target measurement point becomes larger along the shooting direction of the stereo camera.

In the example shown in FIGS. 10A and 10B, when the point 1000 is photographed from the installation point P0, the imaging direction and the x direction are perpendicular to each other, and the imaging is performed in the direction in which the measurement error in the x direction is small. On the other hand, in the examples shown in FIGS. 11A and 11B, when shooting the point 1100 from the installation point P0, the shooting direction and the x direction are not perpendicular to each other, so that the measurement in the x direction is performed as compared with the case of shooting in the direction perpendicular to the x direction. The error becomes large. Further, since the distance D101 between the installation point P0 and the point 1000 is smaller than the distance D111 between the installation point P0 and the point 1100, the error range 1020 that causes a measurement error with respect to the point 1000 is a measurement error with respect to the point 1100. It is smaller than the error range 1120 that causes. As a result, the measurement error W2 in the x direction of the error range 1120 is larger than the measurement error W1 in the x direction of the error range 1020. In order to reduce the measurement error, the shooting direction (z direction in this example) and the displacement direction (x direction in this example) are perpendicular to each other, and the distance between the installation point P0 and the measurement point is smaller. It is necessary to arrange the installation point P0 and the measurement point in the positional relationship.

As described above, it is preferable to measure the free end 1012 in order to know the contraction width of the roof 1001. In the present embodiment, since the measuring device 130 cannot be installed in the non-installable area 202 close to the free end 1012, the installation point P0 is installed in the installable area 201 far from the free end 1012. In this case, the shooting direction from the installation point P0 to the free end 1012 is not perpendicular to the x direction, which is the displacement direction of the free end 1012, and the distance between the installation point P0 and the free end 1012 is relatively large. If the measuring device 130 directly measures the free end 1012, the measurement error may increase. Therefore, the measuring device 130 measures the point 1000 at a position close to the installation point P0 in order to make the shooting direction and the displacement direction perpendicular to each other and to reduce the distance between the installation point P0 and the measurement point.

A mode in which the measuring device 130 measures the measurement target 150 will be described. In the example shown in FIGS. 10A and 10B, the measuring device 130 takes a fixed point image of the point 1000 above the installation point P0 with a stereo camera from directly below the roof 1001 for a predetermined period, and obtains the three-dimensional coordinates of the point 1000. The indicated measurement data is output over time. The measuring device 130 may take a fixed point image of the point 1000 diagonally upward from the installation point P0 located at a position deviated from directly below the roof 1001 in the y direction. When the roof 1001 contracts, the three-dimensional coordinates of the point 1000 change according to the contraction.

Therefore, based on the measurement data output from the measuring device 130, the displacement amount of the point 1000 in the x direction (hereinafter referred to as the contraction width of the point 1000) in a predetermined period can be calculated. For example, the contraction width of the point 1000 is the difference between the x-coordinate of the point 1000 at the start of the predetermined period and the x-coordinate of the point 1000 at the end of the predetermined period.

When the measuring device 130 is an image measuring device, it is preferable to measure feature points suitable for image measurement on the measurement target 150. The feature points suitable for image measurement are, for example, the intersections of edges, corners, and straight lines on the measurement target 150. As a feature point suitable for image measurement, an index such as a measurement marker installed on the measurement target 150 is also suitable because it is easy to detect an image feature.

The main process executed by the measurement system 100 of the third embodiment is the same as the main process of the first embodiment (see FIG. 6), and a specific process mode thereof will be described. The measurement system 100 of this example measures the contraction width of the roof 1001 as the displacement of the measurement target 150. For example, the user sets the above-mentioned point 1000 as the first point and the free end 1012 as the second point. The fixed end 1011 which is the reference point for the displacement of the roof 1001 is set as the third point. In this case, as shown in FIGS. 10A and 10B, the measuring device 130 measures the point 1000 from the installation point P0, but does not measure the free end 1012. In the data processing device 110, the shrinkage width of the point 1000 is analyzed based on the measurement data of the point 1000.

In this case, the acquisition unit 121 acquires the measurement data of the point 1000 and calculates the contraction width of the point 1000 (S601, S603). The setting unit 123 acquires setting information including a specific displacement pattern, structural information of the measurement target 150, a position of a first point, a position of a second point, and the like (S605). For example, the specific displacement pattern shows a proportional expression as a contraction pattern of the roof 1001 that expands and contracts uniformly. The structural information of the measurement target 150 includes the position of the third point and the position of the free end 1012. In this example, the position of the third point is the x-coordinate of the fixed end 1011 and the coordinate value is 0. The position of the free end 1012 is the x-coordinate of the free end 1012 with respect to the third point. The position of the first point is the x-coordinate of the point 1000 with respect to the third point. The position of the second point is the x-coordinate of the free end 1012 with respect to the third point.

The setting unit 123 sets model data for analyzing the contraction width of the roof 1001 based on the acquired setting information (S607). As an example, the set model data is expressed by the following formula.
ΔN = ΔM × N / M ... (Equation 7)

In (Equation 7), N is the distance in the x direction from the third point to the second point. M is the distance in the x direction from the third point to the first point. ΔN is the amount of displacement (shrinkage width) of the second point on the roof 1001, and in this example, the amount of change in the distance between the second point and the third point. ΔM is the amount of displacement (shrinkage width) of the first point on the roof 1001, and in this example, the amount of change in the distance between the first point and the third point. In this example, since the second point is the free end 1012 and the third point is the fixed end 1011, N is substantially equal to the length of the entire roof 1001 in the x direction, and ΔN is the entire roof 1001. Equal to contraction in the x direction.

The calculation unit 122 calculates ΔN, which is the displacement amount of the second point, based on ΔM, which is the displacement amount of the first point, and the model data of (Equation 7) (S609). For example, the calculation unit 122 assigns a numerical value to the variable (Equation 7) based on the setting information. The distance between the fixed end 1011 and the free end 1012 in the x direction is substituted for N in (Equation 7). The distance between the fixed end 1011 and the point 1000 in the x direction is substituted for M in (Equation 7). The contraction width of the point 1000 calculated in S603 is substituted into ΔM of (Equation 7).

As a result, the calculation unit 122 obtains ΔN indicating the contraction width of the free end 1012. By outputting the maximum amplitude of the calculated center point 212 by the output unit 124 (S611), the user can recognize the contraction width of the free end 1012. In this example, since the contraction width of the free end 1012 is the contraction width from the fixed end 1011 to the free end 1012, the user can recognize the contraction width of the entire roof 1001.

As described above, in the third embodiment, the measurement points (points 1000) are set at the positions of the roof 1001 that are closer to the installation point P0 and the shooting direction is close to perpendicular to the displacement direction, and the measurement points are set. The displacement amount of the analysis point (free end 1012) is calculated based on the displacement amount of. For example, the angle between the displacement direction (x direction) of the displacement amount of the first point (point 1000) and the direction toward the first point (z direction) from the installation point P0 is 90 degrees. The angle between the displacement direction of the displacement amount of the second point (free end 1012) and the direction from the installation point P0 toward the second point is less than 90 degrees. Therefore, the angle between the displacement direction of the displacement amount of the first point and the direction from the installation point P0 toward the first point is the displacement direction of the displacement amount of the second point and the direction from the installation point P0 toward the second point. It is larger than the suspended angle. As a result, as in the first embodiment, the displacement amount of the second point (for example, the contraction width of the roof 1001) is compared with the case of directly measuring an arbitrary second point (for example, the free end 1012) on the measurement target 150. Can be calculated accurately.

In the above embodiment, the case of measuring and analyzing the contraction of the measurement target 150 has been exemplified, but the same applies to the case of measuring and analyzing the expansion of the measurement target 150, and both the contraction and the expansion of the measurement target 150 (that is, expansion and contraction). May be measured and analyzed. For example, since the expansion and contraction of concrete is likely to occur continuously, measurement data may be continuously acquired and its change over time may be observed. In this case, not only the expansion / contraction width within the measurement period can be specified, but also the future expansion / contraction width can be predicted based on the change over time of the measurement data, which can be utilized for further safety management.

<Fourth Embodiment>
A fourth embodiment of the present disclosure will be described. FIG. 12 is a side view of the cantilever structure. In the third embodiment described above, the case where the displacement amount of the analysis point is calculated based on the displacement amount of one measurement point without assuming the displacement of the fixed end 1011 is illustrated, but the fixed end 1011 is also the roof 1001. May change in response to contraction. Therefore, in the fourth embodiment, the cantilever structure is measured and analyzed in the same manner as in the third embodiment, but the displacement amount of the analysis point is calculated based on the displacement amount of the plurality of measurement points.

The main process executed by the measurement system 100 of the fourth embodiment is the same as the main process of the third embodiment (see FIG. 8), and a specific process mode thereof will be described. For example, the user sets the point 1000 and the fixed end 1011 as the first point, and sets the free end 1012 as the second point. In this case, as shown in FIG. 12, the measuring device 130 measures the point 1000 and the fixed end 1011 from the installation point P0, respectively, but does not measure the free end 1012. In the data processing apparatus 110, the contraction width of the free end 1012 is analyzed based on the measurement data of the point 1000 and the fixed end 1011.

In this case, the acquisition unit 121 acquires the measurement data of the point 1000 and the fixed end 1011 and calculates the contraction width thereof (S801, S803). The setting unit 123 acquires the setting information (S605). For example, the specific displacement pattern included in the setting information shows a proportional expression which is a contraction pattern of the roof 1001 as in the third embodiment. The setting unit 123 sets the model data (Equation 7) based on the setting information (S607).

The calculation unit 122 calculates the displacement amount of the free end 1012 as follows based on the model data of (Equation 7) (S609). The x-coordinates of the fixed end 1011 and the point 1000 at the start of measurement (time t0) are set to x0 (t0) and x1 (t0), respectively. The x-coordinates of the fixed end 1011 and the point 1000 at the start of measurement (time t1) are set to x0 (t1) and x1 (t1), respectively. In this case, the contraction width of the distance from the fixed end 1011 to the point 1000 in the measurement period from the time t0 to the time t1 is ΔM (t0 → t1). In this case, ΔM (t0 → t1) is expressed by the following mathematical formula.
ΔM (t0 → t1) = (x1 (t1) -x0 (t1))-(x1 (t0) -x0 (t0)) ... (Equation 8)

In the present embodiment, the fixed end 1011 and the point 1000 are closer to the installation point P0 than the free end 1012, and the photographing direction from the installation point P0 is closer to perpendicular to the x direction which is the displacement direction. It becomes the direction. Therefore, the measurement error of the measuring device 130 is smaller when the fixed end 1011 and the point 1000 are measured than when the free end 1012 is measured. That is, the distance between the two points of the fixed end 1011 and the point 1000, that is, x1 (t1) -x0 (t1) and x1 (t0) -x0 (t0), both have a small measurement error. Therefore, the calculation unit 122 can accurately calculate ΔM (t0 → t1), which is the contraction width of the distance between two points in the measurement period, based on (Equation 8).

By substituting the calculated ΔM (t0 → t1) into the ΔM of (Equation 7), the calculation unit 122 can calculate ΔN so that the displacement of the fixed end 1011 generated when the roof 1001 contracts is reflected. The output unit 124 outputs the calculated contraction width ΔN to the display unit 115 or the like as an analysis result (S611).

When the roof 1001 expands and contracts, the numerical values of L and M in (Equation 7) may also change. However, the expansion / contraction width ΔN of the roof 1001 is usually extremely small as compared with the length N of the roof 1001. Therefore, even if the influence of the expansion and contraction of the roof 1001 on the numerical values of L and M is ignored, the displacement amount of the second point (free end 1012) can be accurately calculated based on the model data of (Equation 7).

Here, if the installation point P0 or the measurement direction deviates during the measurement of the measuring device 130, the position of the measuring point as seen from the measuring device 130 also deviates, so that the amount of change indicated by the measurement data may change unexpectedly. be. For example, when the measuring device 130 rotates about the y-axis, the x-coordinate and z-coordinate of the fixed end 1011 change when viewed from the measuring device 130, and the x-coordinate and z-coordinate of the point 1000 when viewed from the measuring device 130 change. Change. However, since the positional relationship between the fixed end 1011 and the point 1000 does not change, the distance between the two points between the fixed end 1011 and the point 1000 does not change either. Therefore, according to the present embodiment, even if the installation point P0 or the measurement direction is deviated as described above, the displacement amount of the analysis point can be accurately calculated based on the distance between the two measurement points. ..

As described above, in the fourth embodiment, the shooting direction from the installation point P0 in the roof 1001 is a direction close to perpendicular to the displacement direction, and a plurality of measurement points (fixed end 1011) are located closer to the installation point P0. And points 1000) are set, and the displacement amount of the analysis point (free end 1012) is calculated based on the displacement amounts of these plurality of measurement points. As a result, as in the third embodiment, the displacement amount of the second point (for example, the contraction width of the roof 1001) is compared with the case of directly measuring an arbitrary second point (for example, the free end 1012) on the measurement target 150. Can be calculated accurately. As in the second embodiment, the quantity and position of a plurality of measurement points can be freely set.

<Fifth Embodiment>
A fifth embodiment of the present disclosure will be described. As mentioned above, concrete shrinks due to drying, but it is also known that thermal expansion due to temperature occurs. In this embodiment, the displacement of concrete used in large buildings such as tunnels, bridges, and buildings is measured, and the measurement data is analyzed in consideration of the influence of thermal expansion for more suitable safety management. Realize.

The fifth embodiment is the same as the third embodiment. However, the calculation unit 122 calculates the displacement amount of the second point based on at least one of the humidity, the temperature, and the illuminance at the time when the measuring device 130 measures the first point. In the following, a case where the displacement amount of the second point is calculated based on the humidity (drying) and the temperature at the time when the first point is measured will be illustrated.

In the main process (see FIG. 6), the calculation unit 122 calculates the displacement amount of the second point as follows based on the model data of (Equation 7) (S609). Let M be the distance in the x direction from the third point (fixed end 1011) to the first point (point 1000). Let L be the distance in the x direction from the third point to the second point (free end 1012). Let the magnitude of M at the time t0 and the temperature th0 be M (t0, th0). Let the magnitude of M at the time t1 and the temperature th1 be M (t1, th1).

In this case, the contraction width of the distance from the third point to the first point in the measurement period from the time t0 to the time t1 is ΔM (t0 → t1, th0 → th1). In this case, ΔM (t0 → t1) is expressed by the following mathematical formula.
ΔM (t0 → t1, th0 → th1) = M (t1, th1) -M (t0, th0) ... (Equation 9)

Here, ΔM (t0 → t1, th0 → th1) of (Equation 9) is a value affected by expansion and contraction (that is, thermal expansion) due to temperature change in addition to the influence of shrinkage due to drying of concrete. .. In order to evaluate the displacement of the measurement target 150 due to drying, it is necessary to consider the influence of thermal expansion. Assuming that the coefficient of thermal expansion of concrete is γ, ΔM (th0 → th1), which is the amount of displacement due to thermal expansion, is expressed by the following mathematical formula.
ΔM (th0 → th1) = M (t0, th0) × γ × (th1-th0) ... (Equation 10)

Therefore, ΔM (t0 → t1), which is a displacement amount excluding the influence of thermal expansion, is expressed by the following mathematical formula.
ΔM (t0 → t1) = ΔM (t0 → t1, th0 → th1) −ΔM (th0 → th1) ... (Equation 11)

For example, when the roof 1001 expands and contracts uniformly due to drying and thermal expansion, the calculation unit 122 sets ΔN, which is the displacement amount of the entire roof 1001 excluding the influence of thermal expansion, based on (Equation 7) to (Equation 11). Can be calculated. It should be noted that M, which is the distance in the x direction from the third point to the first point, should be large enough to accurately measure ΔM, which is the amount of change, so that ΔN, which is the displacement amount of the entire roof 1001, can be calculated accurately. can.

In the above embodiment, the case of analyzing the shrinkage caused by drying by excluding the influence of temperature such as thermal expansion has been described, but the expansion and contraction caused by temperature may be analyzed by excluding the influence of drying. For example, by the same method as the above embodiment, the expansion and contraction width assumed when the temperature changes by a predetermined amount can be calculated based on the coefficient of thermal expansion and N which is the length of the roof 1001. Therefore, it is possible to estimate the amount of displacement of the roof 1001 when a temperature change occurs, calculate the temperature at which the displacement that causes a problem in safety management occurs, and estimate the time when the amount of displacement that causes a problem in safety management is reached. By estimating the safety management problem in advance in this way, it is possible to warn the user before the problem occurs, for example.

As described above, in the fifth embodiment, as in the third embodiment, the displacement amount of the second point can be calculated more accurately than in the case of directly measuring an arbitrary second point on the measurement target 150. Furthermore, by analyzing the displacement amount of the measurement target 150 (for example, the shrinkage width of the roof 1001) excluding the expansion and contraction due to the temperature change, only the displacement amount due to drying can be accurately calculated, which is caused by a plurality of factors. The measurement target 150 that is displaced can be suitably analyzed.

In the above embodiment, a case where the measurement target 150 displaced due to two factors of drying and temperature is measured and analyzed is illustrated. However, the factor of displacement of the measurement target 150 may be other factors (for example, humidity, amount of sunshine, etc.) different from drying and temperature. The number of factors that cause the measurement target 150 to be displaced may be three or more. Even in such a case, the measurement target 150 can be measured and analyzed in the same manner as in the above embodiment by calculating the displacement amount caused by each factor in consideration of the characteristics of each factor (for example, the coefficient of thermal expansion).

<Remarks>
The present disclosure is not limited to the above embodiment, but is replaced with a configuration that is substantially the same as the configuration shown in the above embodiment, a configuration that exhibits the same action and effect, or a configuration that can achieve the same purpose. You may.

For example, the control unit 111 may display the captured image of the measurement target 150 on the display unit 115 and display the measurement error of each position on the captured image. The measurement accuracy of each position was calculated based on, for example, the distance between the two points of the installation point P0 and each position, the measurement direction of the measuring device 130 (for example, the laser direction and the photographing direction), the specifications of the measuring device, and the like. It is a theoretical value or an estimated value of the measurement error. In this case, the control unit 111 may display a captured image including the first point and the second point, and display each measurement error of the first point and the second point on the captured image. As a result, the user can confirm the difference in the measurement error between the first point and the second point by referring to the captured image. The control unit 111 may display the measurement error in a manner that makes it easy to set the first point as follows.

As described above, the measurement error of the measuring device 130 changes depending on the positional relationship between the installation point P0 and the measurement point. If the user does not fully understand the characteristics of the measuring device 130, it may be difficult to set a position having a small measurement error in the measurement target 150 as the first point. Therefore, the measurement system 100 may specify the measurement accuracy of each position on the measurement target 150, for example, when the user sets the first point.

For example, the control unit 111 displays a measurement accuracy screen for the user to set as the first point on the display unit 115 or the like. FIG. 13 is an example of the measurement accuracy screen 1300. FIG. 14 is an example of the measurement accuracy screen 1400.

The measurement accuracy screen 1300 is a screen on which a gradation showing the measurement accuracy of each position on the measurement target 150 is superimposed on the captured image 1310 of the measurement target 150. For example, the control unit 111 displays a gradation of light and dark on the captured image 1310 so that the smaller the distance from the installation point P0, the higher the measurement accuracy. For example, the light-dark gradation indicates that the measurement accuracy decreases from the left side of the screen corresponding to the area near the installation point P0 to the right side of the screen corresponding to the area far from the installation point P0. In this example, the measurement accuracy is shown by the gradation of light and dark, but the measurement accuracy may be shown by the gradation of hue and saturation.

The user can operate the pointer 1301 displayed on the measurement accuracy screen 1300 by using the input unit 114. When any position of the captured image 1310 is selected by the pointer 1301, the control unit 111 sets the position on the measurement target 150 corresponding to the selected position as the first point. Therefore, even a user who does not fully understand the characteristics of the measuring device 130 can set an arbitrary position with high measurement accuracy as the first point by referring to the measurement accuracy screen 1300.

The measurement accuracy screen 1400 is a screen on which a numerical value indicating the measurement accuracy of each position on the measurement target 150 is superimposed on the captured image 1410 of the measurement target 150. For example, the control unit 111 extracts a plurality of feature points from the measurement target 150 and displays the numerical value of the measurement accuracy corresponding to each feature point on the captured image 1410. Similar to the above, the user can operate the pointer 1401 displayed on the measurement accuracy screen 1400 to set an arbitrary position with high measurement accuracy as the first point. In this example, if the combination of the measured value and the measurement error (for example, 1500 mm ± 10 mm) is displayed as the measurement accuracy corresponding to each feature point, the measured value and the measurement accuracy can be confirmed at the same time, which is preferable. If the measurement accuracy corresponding to each feature point is displayed at the position pointed to by the pointer 1401, the user can specify an arbitrary position, check the measurement accuracy at that position, and then set the measurement accuracy. Is.

As the measuring device 130, various types of devices such as a laser measuring device, a two-dimensional laser scanner, a three-dimensional laser scanner, an ultrasonic measuring device, and an image measuring device can be applied. Regardless of the device type, the measuring device 130 directly measures the analysis point (second point) based on the positional relationship between the installation point P0 of the measuring device 130 and the measurement point of the measurement target 150. The measurement point (first point) may be set at a position where the measurement error becomes small.

When the reflected light of the laser irradiated to the measurement target 150 is visible, the user can confirm the position of the measurement point based on the reflected light. In this case, the user may set the measurement point at a position where the reflected light can be easily visually recognized, or may install a measurement marker on the measurement target 150 so that the reflected light can be easily visually recognized. In this case, not only the measurement error of the measuring device 130 can be suppressed, but also the accuracy of the position setting of the installation point P0 can be improved.

The analysis point (second point) may be arranged outside the measurable range of the measuring device 130. The outside of the measurable range is, for example, a remote area where the laser of the measuring device 130 does not reach, or a remote area where the second point cannot be identified on the captured image of the measuring device 130. The second point may be arranged in a blind spot where the measuring device 130 cannot optically measure the second point. The blind spot is, for example, a position where the second point is hidden behind a building or the like when viewed from the measuring device 130. In these cases, the measuring device 130 cannot effectively measure the second point, but the data processing device 110 can calculate the displacement amount of the second point based on the measurement result of the first point by the measuring device 130.

When the second point is in the blind spot of the measuring device 130, if the position of the installation point P0 is changed, the second point may come out of the blind spot. Even in such a case, if the first point satisfying a predetermined condition can be set, it is desirable to set and measure the first point without changing the position of the installation point P0. The predetermined condition is that the measurement error when measuring the first point from the installation point P0 before the change and calculating the measurement value of the second point from the measured value directly measures the second point from the installation point P0 after the change. It is smaller than the measurement error in the case of. As a result, it is possible to obtain the displacement amount of the second point with a smaller measurement error by measuring the first point from the installation point P0 before the change than by directly measuring the second point from the installation point P0 after the change.

The control block (particularly the data processing device 110) of the measurement system 100 is provided by a logic circuit (hardware) formed in an integrated circuit (IC chip) such as an ASIC (Application Specific Integrated Circuit) and an FPGA (Field Programmable Gate Array). It may be realized by software using a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit).

In the latter case, the data processing device 110 is a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the above program and various data are readablely recorded by a computer (or CPU). Alternatively, it is provided with a storage device (referred to as a "recording medium"), a RAM (Random Access Memory) for developing the above program, and the like. The present disclosure is achieved by a computer (or CPU) reading and executing the program from the recording medium. As the recording medium, a "non-temporary tangible medium" such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be applied. The program may be supplied to the computer via any transmission medium (such as a communication network or broadcast wave) capable of transmitting the program. One aspect of the present disclosure may also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

The present disclosure is not limited to each of the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in each of the different embodiments. Is also included in the technical scope of the present invention. Further, by combining the technical means disclosed in each embodiment, new technical features can be formed.

110 data processing device, 130 measuring device, 150 measurement target, 121 acquisition unit, 122 calculation unit

Claims (15)

An acquisition unit that acquires the displacement amount of the first point based on the measurement data showing the result of the measuring device remotely measuring the first point on the measurement target from the predetermined installation point.
Based on the acquired displacement amount of the first point and model data showing the correlation between the position and the displacement amount in the measurement target, the second position on the measurement target different from the first point. A calculation unit that calculates the amount of displacement of a point, and
A data processing device equipped with. At the first point and the second point, when the measuring device measures the first point and the second point from the installation point, the measurement error of the displacement amount of the first point is the second point. Arranged in a positional relationship that is smaller than the measurement error of the displacement amount of
The data processing apparatus according to claim 1. The angle formed by the displacement direction of the displacement amount of the first point and the direction from the installation point toward the first point is the displacement direction of the displacement amount of the second point and the direction from the installation point toward the second point. Larger than the angle between
The data processing apparatus according to claim 2. The angle from the installation point toward the first point is the angle formed by the surface of the measurement target at the first point, and the direction from the installation point toward the second point is the measurement target at the second point. Larger than the angle formed by the surface,
The data processing apparatus according to claim 2. The distance between the first point and the installation point is smaller than the distance between the second point and the installation point.
The data processing apparatus according to claim 2. The second point is arranged outside the measurable range of the measuring device.
The data processing apparatus according to any one of claims 1 to 5. The second point is arranged in a blind spot where the measuring device cannot optically measure the second point.
The data processing apparatus according to any one of claims 1 to 6. The acquisition unit acquires the displacement amounts of the plurality of first points based on the plurality of measurement data showing the results of remote measurement of the plurality of the first points.
The calculation unit calculates the displacement amount of the second point based on the acquired displacement amount of the first point and the model data.
The data processing apparatus according to any one of claims 1 to 7. The displacement amount of the first point is the amplitude of the first point.
The calculation unit calculates the displacement amount of the second point, which is the amplitude of the second point, based on the displacement amount of the first point and the model data.
The data processing apparatus according to any one of claims 1 to 8. The acquisition unit calculates and acquires the displacement amount of the first point based on a plurality of the measurement data indicating the values measured by the measuring device at a plurality of different times.
The data processing apparatus according to any one of claims 1 to 9. The displacement amount of the first point is the amount of change in the distance between the first point and the third point located at a position different from the first point and the second point on the measurement target.
The calculation unit calculates the displacement amount of the second point, which is the change amount of the distance between the second point and the third point, based on the displacement amount of the first point and the model data.
The data processing apparatus according to any one of claims 1 to 10. The calculation unit calculates the displacement amount of the second point based on at least one of humidity, temperature, and illuminance at the time when the measuring device measures the first point.
The data processing apparatus according to any one of claims 1 to 11. A data processing program for causing a computer to function as the data processing device according to any one of claims 1 to 12. A computer-readable recording medium on which the program according to claim 13 is recorded. Based on the measurement data showing the result of the measuring device remotely measuring the first point on the measurement target from the predetermined installation point, the displacement amount of the first point is acquired.
Based on the acquired displacement amount of the first point and the model data showing the correlation between the position and the displacement amount in the measurement target, the second position on the measurement target different from the first point. Calculate the displacement of a point,
Data processing method with.

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