Non-destructive testing measuring device, non-destructive testing method, non-destructive testing information processing device and program

Abstract

To facilitate the existence / nonexistence of a damage of an inspection object and the determination of its place by increasing a magnetic field component derived from the inspection object by a new measurement method while following a measurement method with a magnetic field application unit arranged only on one side of a magnetic sensor in nondestructive inspection using magnetism.SOLUTION: In a first measurement step, a magnetic field application unit (3) is arranged at an application position (26L) of one side in a first direction (X) closer than a plurality of positions to be measured by a magnetic sensor (21) to acquire first measurement data by performing measurement, and in a second measurement step, the magnetic field application unit is arranged at an application position (26R) of the other side in the first direction closer than the plurality of positions to be measured by the magnetic sensor to acquire second measurement data by performing measurement. Data for determination is combined on the basis of the first measurement data and the second measurement data.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to measurements and measurement data processing in non-destructive testing using magnetism. [Background technology]

[0002] Applications of non-destructive testing using magnetism include diagnosing fractures caused by corrosion or deterioration of magnetic materials such as reinforcing bars, steel rods, and wires contained within non-magnetic materials such as concrete and rubber, and in particular diagnosing fractures of prestressing steel and reinforcing bars in road and railway bridge girders, piers, and decks. The nondestructive inspection device described in Patent Document 1 has a configuration in which a magnetic field application unit is disposed on only one side of a magnetic sensor, a magnetic field of a first polarity, which is either N or S polarity, is applied to an object to be inspected from the magnetic field application unit such as a magnet, and the magnetic field from the object to be inspected is detected by the magnetic sensor in a state in which a magnetic field distribution is formed in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit. The magnetic field is measured by the magnetic sensor at multiple positions at different distances from the magnetic field application unit along the first direction, so that a magnetic field distribution according to the distance from the magnetic field application unit can be obtained, and an abnormality in the object to be inspected can be determined based on the magnetic field distribution. According to the invention described in Patent Document 1, since it is sufficient to place a magnetic field application unit on only one side of the magnetic sensor, the device can be made small and lightweight, and is also highly portable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 027028 Summary of the Invention [Problem to be solved by the invention]

[0004] As in the invention described in Patent Document 1, a magnetic field is applied to the object being inspected, the magnetic field from the object is measured with a magnetic sensor, and by referring to the measurement data, it is possible to determine whether the object being inspected has been damaged and where the damage is located. However, the measurement data obtained by the magnetic sensor with the magnetic field application unit disposed only on one side of the magnetic sensor has a weak magnetic field component originating from the test object. Therefore, the change in the measurement data due to the presence or absence of damage to the test object is also small. Therefore, it may be difficult to read the change due to the presence or absence of damage to the test object from the measurement data.

[0005] The present invention has been made in consideration of the problems with the conventional technology described above, and has an objective of making it easier to determine whether or not an object is damaged and where it is located in a non-destructive inspection using magnetism by strengthening the magnetic field components originating from the object being inspected using a new measurement method while still following the measurement method in which a magnetic field application unit is placed on only one side of a magnetic sensor. [Means for solving the problem]

[0007] Another aspect of the present invention is a measuring device for non-destructive testing in which a magnetic material contained in a non-magnetic body is an object to be tested, comprising: A magnetic field application unit that applies a magnetic field and a sensor unit that measures the magnetic field, the magnetic field application unit is detachably attached to one end and the other end of the sensor unit along a first direction, The sensor unit is capable of measuring magnetic fields at different positions along at least a first direction. The measurement data by the sensor unit can be output to an external device, First measurement data measured by the sensor unit in a state where the magnetic field application unit is placed at one end and not placed at the other end; Second measurement data measured by the sensor unit in a state where the magnetic field application unit is arranged at the other end and not arranged at the one end; A means for calculating judgment data based on the The judgment data can be output to an external device. It is a non-destructive testing measuring device.

[0008] Another aspect of the present invention is a non-destructive inspection method in which a magnetic material contained in a non-magnetic body is an object to be inspected, comprising the steps of: a measurement data acquisition process in which a magnetic field of a first polarity, which is N polarity or S polarity, is applied from a magnetic field application unit to the test object from a surface of the non-magnetic body, and measurement data is acquired by measuring the magnetic field from the test object in a state in which the magnetic field from the test object forms a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit, at a plurality of positions at different distances from the magnetic field application unit along a first direction away from the magnetic field application unit, using a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit; and a judgment data calculation step of calculating judgment data for judging a state of the inspection object based on the measurement data acquired in the measurement data acquisition step, In the measurement data acquisition step, First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from among the multiple positions measured by the magnetic sensor; and and acquiring second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor; In the determination data calculation step, the nondestructive inspection method synthesizes determination data based on the first measurement data and the second measurement data.

[0009] Another aspect of the present invention is an information processing device for non-destructive testing using a computer, the information processing device being configured to detect a magnetic material contained in a non-magnetic body as an object to be tested, the information processing device comprising: The computer includes: a measurement data acquiring means for acquiring measurement data obtained by applying a magnetic field of a first polarity, which is N polarity or S polarity, from a surface of the non-magnetic body to the test object from the magnetic field application unit, the measurement data being obtained by measuring the magnetic field from the test object in a state in which the magnetic field from the test object forms a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit, at a plurality of positions at different distances from the magnetic field application unit along a first direction moving away from the magnetic field application unit, using a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit; a determination data calculation means for calculating determination data for determining a state of the inspection object based on the measurement data acquired by the measurement data acquisition means; The measurement data acquisition means First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from among the multiple positions measured by the magnetic sensor; and It is possible to obtain second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor, The determination data calculation means is an information processing device for non-destructive testing capable of synthesizing determination data based on the first measurement data and the second measurement data.

[0010] Another aspect of the present invention is a computer program for causing a computer to function as an information processing device for non-destructive testing of a magnetic material contained in a non-magnetic body as an object to be tested, comprising: The computer, a measurement data acquiring means for acquiring measurement data obtained by applying a magnetic field of a first polarity, which is N polarity or S polarity, from a surface of the non-magnetic body to the test object from the magnetic field application unit, the measurement data being obtained by measuring the magnetic field from the test object in a state in which the magnetic field from the test object forms a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit, at a plurality of positions at different distances from the magnetic field application unit along a first direction moving away from the magnetic field application unit, using a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit; functioning as a judgment data calculation means for calculating judgment data for judging a state of the inspection object based on the measurement data acquired by the measurement data acquisition means; The measurement data acquisition means First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from among the multiple positions measured by the magnetic sensor; and It is possible to obtain second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor, The judgment data calculation means is an information processing program for non-destructive testing that is capable of synthesizing judgment data based on the first measurement data and the second measurement data. Effect of the Invention

[0011] According to the present invention, in non-destructive testing using magnetism, while following the measurement method in which a magnetic field application unit is placed on only one side of a magnetic sensor, a new measurement method is used to strengthen the magnetic field components originating from the object being tested, making it easier to determine whether the object being tested has been damaged and where the damage is located. [Brief description of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of a non-destructive inspection system according to an embodiment of the present invention. [Diagram 2] 1A and 1B are a front schematic view and a plan schematic view of a nondestructive inspection measuring device according to one embodiment of the present invention, showing a state during a first measurement. [Diagram 3] FIG. 2 is a perspective view of a sensor substrate according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing a measurement state according to the magnetic stream method of the present invention. [Diagram 5] 13 is an example of a measured waveform diagram of a magnetic field distribution along a first direction X of a Z-direction magnetic field component. [Figure 6] This is a two-dimensional distribution map of the magnetic field on the XZ plane measured for the healthy model. [Figure 7] This is a two-dimensional distribution map of the magnetic field on the XZ plane measured for the fracture model. [Figure 8] FIG. 13 is a measurement state diagram when there are intersecting stirrups. [Figure 9] 4 is a flowchart showing measurement and subsequent processing according to an embodiment of the present invention. [Figure 10]1 is a schematic front view of a nondestructive testing measuring device according to an embodiment of the present invention, showing a state during measurement without a magnet. [Figure 11] FIG. 2 is a schematic front view of a nondestructive inspection measuring device according to one embodiment of the present invention, showing a state during a second measurement. [Figure 12] 10 is a graph showing an example of the first measurement data and the second measurement data after the environment removal process, where (a) shows a case where the inspection object is sound, and (b) shows a case where the inspection object is broken. [Figure 13] 13 is a graph corresponding to the data of FIG. 12 after distance correction. [Figure 14] 14 is a graph corresponding to a linear approximation of the data shown in FIG. 13. [Figure 15] 14 is a graph corresponding to a quadratic approximation of the data shown in FIG. 13. [Figure 16] 15 is a graph showing the data shown in FIG. 13 after correction processing using the linear approximation equation shown in FIG. 14. [Figure 17] 16 is a graph showing the data shown in FIG. 13 after correction processing using the quadratic approximation formula shown in FIG. 15. [Figure 18] 17 is a graph of determination data corresponding to a difference between the first measurement data and the second measurement data shown in FIG. 16. [Figure 19] 18 is a graph showing determination data corresponding to a difference between the first measurement data and the second measurement data shown in FIG. 17. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The following is an embodiment of the present invention, and is not intended to limit the present invention.

[0014] [Outline of non-destructive testing] An outline of the non-destructive inspection according to one embodiment of the present invention will now be described. An overall configuration diagram of a non-destructive inspection system according to one embodiment of the present invention is shown in FIG. As shown in FIG. 1, the nondestructive inspection system 10 of this embodiment includes a nondestructive inspection measuring device 1, a cloud computer 9, and a portable computer 4. The measuring device 1 includes a sensor unit 2 and a magnetic field application unit 3. The sensor unit 2 is a block for magnetic measurement, and is equipped with a plurality of magnetic sensors 21. The magnetic sensor 21 may be a uniaxial sensor that detects a magnetic field component in one axis direction from the direction of the object to be inspected, but is more preferably a 3-axis sensor that can detect magnetic fields in three axis directions around the magnetic sensor. When a 3-axis sensor is used as the magnetic sensor 21, a 3-axis sensor that can detect magnetic field components in three axis directions perpendicular to each other is preferable, but it may be composed of a combination of three uniaxial sensors with sensor axes arranged in the three axis directions. Known examples of the magnetic sensor 21 include a Hall element, which is a semiconductor sensor, and a magnetoresistance sensor, such as an MR sensor, an MI sensor, or a TMR sensor. In this measurement device 1, a Hall element sensor is used due to the balance between magnetic sensitivity and dynamic range.

[0015] The voltage generated by the magnetic sensor 21 is converted into a digital value by the A / D section 22 to generate measurement data, which is then transmitted to the outside via the mobile communication unit 23. The sensor unit 2 is equipped with a CPU 24 for overall control, as well as an operation unit 25. The transmitted data is processed for inspection by a cloud computer 9, which is an example of an information processing device of this system. In this way, the measuring device 1 is capable of externally outputting the measurement data obtained by the sensor unit 2. In addition to wired or wireless data communication, the measurement data may be stored in a recording medium that is detachable from the sensor unit 2 in order to enable external output of the measurement data.

[0016] In this embodiment, the magnetic field applying unit 3 includes a permanent magnet. In this embodiment, the magnetic field application unit 3 applies a magnetic field of either N or S polarity to a magnetic material as an inspection object, for example, a steel material contained in a non-magnetic material such as a concrete structure, from an application position on the surface of the non-magnetic material, thereby forming a magnetic flow path in the inspection object. The sensor unit 2 measures the magnetism leaking out from the inspection object with the magnetic sensor 21 while the magnetic flow path is formed. This is called the magnetic stream method. The cloud computer 9 is a web server that immediately processes the measurement data uploaded from the sensor unit 2 so that it can be displayed on the browser app of the portable computer 4.

[0017] 2 and 3 show a mechanism diagram of a non-destructive testing measuring device according to this embodiment of the present invention. As shown in Fig. 2, a sensor array equipped with one or more magnetic sensors 21 (21M, 21R) is arranged close to a measurement surface 26M inside a housing 26. In this embodiment, a case where a sensor array is configured will be mainly described. In the figure, three orthogonal axes XYZ are shown, with the first direction being the X-axis, the second direction being the Y-axis, and the third direction being the Z-axis. As shown in FIG. 2, the magnetic field application unit 3 and the magnetic sensor 21 are arranged in the first direction X. As shown in FIG. 2(b), a plurality of magnetic sensors 21 are arranged in the Y direction. As shown in FIG. 2(a) and FIG. 3, two magnetic sensors 21M, 21R are arranged in the Z direction. The measurement surface 26M is one of the outer surfaces of the housing 26 parallel to the XY plane, and is the side where the magnetic sensor 21 is arranged in close proximity. In the space on the opposite side of the housing 26, the operation unit 25, the A / D unit 22, the mobile communication unit 23, the circuit board mounting the CPU 24, etc. are arranged. The end face of the magnetic field application unit 3, which is the S pole or the N pole, is arranged at approximately the same position on the Z-axis coordinate as the measurement surface 26M, and the magnetic field application unit 3 is attached to the sensor unit 2. A holder 26L is connected to the housing 26 at one end of the sensor unit 2 in the X direction (the left end in the figure). A holder 26R is connected to the housing 26 at the other end of the sensor unit 2 in the X direction (the right end in the figure). The magnetic field application unit 3 can be attached and detached to the holders 26L, 26R. For example, the magnetic field application unit 3 can be attached and detached to one end or the other end of the sensor unit 2 along the first direction X. By mounting the magnetic field application unit 3 to the holder 26L (26R), the magnetic field application unit 3 is accurately positioned at an application position that is determined relatively to the sensor unit 2. This makes it possible to determine the application position accurately and with good reproducibility regardless of the skill of the operator. In addition, because the holder 26L at one end and the holder 26R at the other end have a common attachment / detachment structure, the magnetic field application unit 3 detachable from the holder 26L at one end and the magnetic field application unit 3 detachable from the holder 26R at the other end can be the same. This allows the use of only one magnetic field application unit 3, simplifying the measurement device 1 and improving the efficiency of measurement work and management. Of the two magnetic sensors 21M and 21R arranged in the Z direction, the one closer to the measurement surface 26M is a main sensor 21M, and the one farther away is a reference sensor 21R.

[0018] The sensor unit 2 is capable of scanning the magnetic sensor 21 while moving it in the X direction by a sensor scanning mechanism 27 driven by a motor 27M. During actual measurement, scanning is performed by the magnetic sensor 21 with the measurement surface 26M of the housing 26 aligned with the measurement surface (such as a concrete surface) of the measurement target structure that contains the object to be measured. As long as the sensor unit 2 and the magnetic field application unit 3 are not moved from their fixed positions relative to the object to be measured during measurement, the sensor scanning mechanism 27 is configured to be able to perform measurement while scanning the magnetic sensor 21 at any position or to stop the magnetic sensor 21 at any position, and it is possible to repeatedly measure the same position any number of times, and the distance of the measurement position relative to the magnetic field application unit 3 is also reproducible. For example, as described above, the sensor unit 2 is capable of measuring magnetic fields at a plurality of different positions along the first direction X. To achieve this, a sensor array type in which a plurality of magnetic sensors are arranged in the X direction may be configured instead of the scanning type described above. For example, the sensor unit 2 may be configured to have a plurality of magnetic sensors two-dimensionally arranged in the first direction X and the second direction Y perpendicular to the first direction. This also makes it possible to obtain measurement values ​​at each XY coordinate along the measurement surface 26M.

[0019] The measurement principle according to the magnetic stream method of the present invention will be described with reference to FIG. FIG. 4 illustrates a state in which a magnetic flow path according to the measurement principle of the present invention is formed. The object to be inspected 8 is assumed to be a reinforcing steel bar or PC steel, which is a magnetic material, and is assumed to have a fractured portion 8B with a gap of approximately 1 cm in the center (the surrounding non-magnetic material (concrete) is not shown; the same applies below). A magnetic field of N polarity is applied from the magnetic field application unit 3 to the inspection object 8, and a magnetic field flows in the inspection object 8, which is a magnetic body. The magnetic field flowing through the magnetic body is gradually released to the outside and gradually attenuates. The magnetic sensor 21 is configured to be able to scan along the inspection object 8, and is configured to be able to capture leakage magnetic flux in the longitudinal direction of the inspection object 8. The magnetic field applied from the magnetic field application unit 3 to the inspection object 8 may be either N polarity or S polarity. That is, the measurement device 1 of this embodiment has a configuration in which a magnetic field of a first polarity, which is N polarity or S polarity, is applied from the magnetic field application unit 3 to the inspection object 8 adjacent in the third direction Z with respect to the arrangement of the magnetic field application unit 3 and the magnetic sensor 21 in the first direction X, and the magnetic field from the inspection object 8 in a state in which a magnetic field distribution is formed in which the magnetic field attenuates in the range of the first polarity as it moves away from the magnetic field application unit 3 along the first direction X is detected by the magnetic sensor 21. The magnetic field is measured by the magnetic sensor 21 at a plurality of positions at different distances from the magnetic field application unit 3 along the first direction X, so that a magnetic field distribution along the first direction X according to the distance from the magnetic field application unit 3 can be obtained. By making the sensor unit 2 the above-mentioned scanning type or sensor array type, a magnetic field distribution along the first direction X according to the distance from the magnetic field application unit 3 can be obtained. If there is no break in the inspection object 8, the leakage magnetic force gradually weakens as it moves away from the magnetic field application unit 3, but if there is a break 8B in the inspection object 8 as shown in Figure 4, the magnetic flow is cut off at the break 8B, so a lot of magnetic force is released before the break 8B and the magnetic force flowing through the inspection object 8 after the break 8B decreases. The measuring device 1 can capture the difference in the distribution of leakage magnetic flux in the inspection object 8 depending on whether there is a break or not.

[0020] FIG. 5 shows an example of a measured waveform diagram of the magnetic field distribution along the first direction X. Fig. 5 shows the distribution of the Z-direction magnetic field component on the XY plane at a certain distance in the Z direction from the object 8 to be inspected, captured by the magnetic sensor 21, for two conditions: when there is a break in the center of the object to be inspected (break model) as shown in Fig. 4, and when the object to be inspected 8 is healthy and has no breaks (healthy model). In addition, a two-dimensional distribution map (a color heat map converted to grayscale) of the magnetic field on the XZ plane measured separately is shown in Fig. 6 for the healthy model and in Fig. 7 for the broken model. In Figs. 6 and 7, the whiter areas indicate areas with a stronger magnetic field, and the measurement positions of the magnetic sensor 21 are shown with black squares. As mentioned above, if there is no fracture in the object to be inspected 8, the magnetic force applied by the magnetic field application unit 3 arranged on the left side of the object to be inspected 8 in Figure 4 flows inside the object to be inspected 8 in the Y direction and is gradually attenuated before being released to the outside (see the solid line graph in Figure 5 and Figure 6). On the other hand, when there is a break in the center of the test object 8, the magnetic force applied by the magnetic field application unit 3 is gradually attenuated as it flows through the test object 8 up to the break 8B and is released to the outside. However, since the flow path through the test object 8 is cut off at the break 8B, almost no magnetic force flows beyond the break 8B, and the waveform is rapidly attenuated at the break 8B (see the broken line graph in FIG. 5 and FIG. 7). Conversely, since a lot of magnetism is released just before the break 8B, the measurement value with the break in the area on the left side of the figure exceeds the measurement value without the break, which is also a characteristic of the break. The above-mentioned tendency of the magnetic field distribution depending on the presence or absence of a break is also valid for the magnetic field distribution at the measurement position (black square) of the magnetic sensor 21 in FIG. 6 and FIG. 7. When observing the magnetic field distribution at the measurement position (black square) of the magnetic sensor 21 in the X direction away from the magnet, in the healthy model of Fig. 6, the magnetic field decays at a nearly constant rate, but in the broken model of Fig. 7, the magnetic field strengthens before the broken part 8B, and conversely, decays rapidly after passing the broken part 8B. Therefore, it can be seen that the magnetic field distribution shown in Fig. 5 can be measured by the magnetic sensor 21 located away from the inspection object 8 in the Z direction.

[0021] [Measurement and subsequent processing] Here, the conditions for measurement are assumed to be the elements shown in FIG. An inspection object 8 such as a PC steel member and intersecting stirrups 5 are contained in a non-magnetic material such as concrete. The intersecting stirrups 5 correspond to the magnetic material other than the inspection object 8. A magnetic field application unit 3 is installed on the surface of a non-magnetic material, and a magnetic field (H1) is applied to the inspection object 8. Measurements are performed by a magnetic sensor 21 along the longitudinal direction (X direction) of the inspection object 8, away from the magnetic field application unit 3. For example, as shown in the figure, a configuration is adopted in which five magnetic sensors (21-1 to 21-5) are arranged in the Y direction, but the number is arbitrary. The intersecting stirrups 5 are located between the surface of the non-magnetic material on which the measurement surface 26M is provided and the test object 8, extend in the Y direction, and a plurality of them are lined up in the X direction.

[0022] For the measurement and subsequent processing, please refer to the flowchart in Figure 9. (Measurement stage) First, a first measurement step S11 is performed. In the first measurement step S11, measurement is performed by the measurement device 1 having the magnetic field application unit 3 attached to the holder 26L as shown in FIG. In the first measurement step S11, the magnetic field application unit 3 is placed at an application position (holder 26L) on one side in the X direction among a plurality of positions in the X direction measured by the magnetic sensor 21, and measurement is performed. The data acquired in this way is set as first measurement data. Two-dimensional distribution data on the XY plane can be obtained by the measurement device 1. At each coordinate, the measurement values ​​of the X-direction magnetic field component, the Y-direction magnetic field component, and the Z-direction magnetic field component can be obtained. 12(a) corresponds to the first measurement data, is a distribution graph of the Z-direction magnetic field component with the horizontal axis being the X-axis, and shows a case where the inspection target 8 is healthy. However, the data shown is after the environment removal step S13 described later. 12(b) corresponds to the first measurement data, is a distribution graph of the Z-direction magnetic field component with the horizontal axis as the X-axis, and shows a case where there is a break in the inspection target 8. However, the data shown is after the environment removal step S13 described later.

[0023] Next, a measurement step S12 without a magnet is performed. In the magnet-free measurement step S12, as shown in Fig. 10, the magnetic field application unit 3 in the first measurement step S11 is detached from the holder 26L and removed, and measurement is performed under conditions in which the magnetic field applied to the inspection object 8 by the magnetic field application unit 3 is removed. This results in measurement conditions in which the influence of the magnetic field applied by the magnetic field application unit 3 in the first measurement step S11 remains. The measurement data measured in this way is used as complementary measurement data. The complementary measurement data measured in the magnet-free measurement step S12 corresponds to measurement data measured in a state where the magnetic field application unit 3 is removed from the application position on one side (holder 26L) after the first measurement data is measured.

[0024] On the other hand, a second measurement step S21 is performed. In the second measurement step S21, measurement is performed by the measuring device 1 with the magnetic field application unit 3 attached to the holder 26R as shown in Fig. 11. It does not matter whether the first measurement step S11 and the second measurement step S21 are performed first or second. The sensor unit 2 is not moved relative to the inspection object 8 in the first measurement step S11, the second measurement step S21, and the magnet-less measurement steps S12 and S22. This is to obtain measurement data at the same position. In the second measurement step S21, the magnetic field application unit 3 is placed at an application position (holder 26R) on the other side in the X direction from the multiple positions in the X direction measured by the magnetic sensor 21, and measurement is performed. The data acquired in this way is set as second measurement data. 12(a) corresponds to the second measurement data, is a distribution graph of the Z-direction magnetic field component with the horizontal axis being the X-axis, and shows a case where the inspection target 8 is healthy. However, the data shown is after the environment removal step S23 described later. 12(b) corresponds to the second measurement data, is a distribution graph of the Z-direction magnetic field component with the horizontal axis as the X-axis, and shows a case where there is a break in the inspection target 8. However, the data shown is after the environment removal step S23 described later.

[0025] Next, a measurement step S22 without a magnet is performed. In the magnet-free measurement step S22, as shown in Fig. 10, the magnetic field application unit 3 in the second measurement step S21 is detached from the holder 26R and removed, and measurement is performed under conditions in which the magnetic field applied to the inspection object 8 by the magnetic field application unit 3 is removed. This results in measurement conditions in which the influence of the magnetic field applied by the magnetic field application unit 3 in the second measurement step S21 remains. The measurement data measured in this way is used as complementary measurement data. The complementary measurement data measured in the magnet-free measurement process S22 corresponds to the measurement data measured in a state where the magnetic field application unit 3 is removed from the application position on the other side (holder 26R) after the second measurement data is measured. Note that it is arbitrary whether the application position on one side and the application position on the other side correspond to holder 26L or holder 26R.

[0026] Regardless of the above description of steps S11, S12, S21, and S22, the magnet-free measurement steps S12 and S22 may be integrated and carried out before or after steps S11 and S21.

[0027] The first measurement data, the second measurement data, and the complementary measurement data measured by the measurement device 1 as described above are output to the outside and acquired by the cloud computer 9. In other words, the measurement device 1 is capable of externally outputting first measurement data measured by the sensor unit 2 with the magnetic field application unit 3 placed at one end in the X direction and not placed at the other end, second measurement data measured by the sensor unit 2 with the magnetic field application unit 3 placed at the other end and not placed at one end, and complementary measurement data measured with the magnetic field application unit 3 removed.

[0028] (Post-measurement processing stage) The cloud computer 9 functions as a measurement data acquisition means and a judgment data calculation means based on an information processing program for non-destructive testing, and executes a measurement data acquisition step and a judgment data calculation step. First, the cloud computer 9 functions as a measurement data acquiring means, and receives the first measurement data, the second measurement data, and the complementary measurement data, thereby completing the measurement data acquiring process.

[0029] Next, the cloud computer 9 functions as a judgment data calculation means and executes a judgment data calculation process (S13-16, S23-26, S30) to calculate judgment data for judging the state of the inspection object 8 based on the measurement data acquired in the measurement data acquisition process. As the judgment data calculation step, first, the environment removal steps S13 and S23 are executed. In the environment removal step S13, the complementary measurement data measured in the magnet-free measurement step S12 is subtracted from the first measurement data. In the environment removal step S23, the complementary measurement data measured in the magnet-free measurement step S22 is subtracted from the second measurement data. Here, if the magnet-free measurement steps S12 and S22 are a common step, the complementary measurement data subtracted from the first measurement data and the complementary measurement data subtracted from the second measurement data are the same. By the environmental removal steps S13 and S23, noise components originating from the environmental magnetic field and not caused by the magnetic field application unit 3 can be removed from the measurement data, making it easier to read signal components that change depending on the state of the inspection object 8.

[0030] Next, distance correction steps S14 and S24 are executed. In the distance correction step S14, the first measurement data is subjected to distance correction to reduce the decrease in the magnetic field depending on the distance from the magnetic field application unit 3 on one side (holder 26L). In the distance correction step S24, the second measurement data is subjected to distance correction to reduce the decrease in the magnetic field depending on the distance from the magnetic field application unit 3 on the other side (holder 26R). That is, the signal is corrected to be stronger as the distance increases. One method for this is to multiply the measured value at the distance by the Nth power of the distance. In this case, N is preferably in the range of 1.0 to 4.0. The amount of correction is increased as the distance from the magnetic field application unit 3 increases. For example, when the X coordinate of the magnetic field application unit 3 is the origin 0, the X coordinate of the measurement position closest to the magnetic field application unit 3 is x1, and the X coordinate of each measurement position is x, the correction magnification P is a function of x, and is expressed as P(x)=(X / X1). NIn this case, the distance correction is performed by multiplying the measured value of each X coordinate by P(x). The graphs after the distance correction steps S14 and S24 are shown in Fig. 13. Due to the distance correction, the graph G11h has changed to the graph G12h, the graph G21h has changed to the graph G22h, the graph G11d has changed to the graph G12d, and the graph G21d has changed to the graph G22d. As shown in FIG. 13, the signal degradation is mitigated with distance. By the distance correction steps S14 and S24, the variation components due to the distance from the magnetic field application unit 3 are mitigated, and the signal components that vary depending on the state of the inspection object 8 can be easily read.

[0031] Next, approximate equation generating steps S15 and S25 are executed. In the approximation formula creation step S15, a linear approximation formula or a quadratic approximation formula is found for the first measurement data. Here, this is performed for the first measurement data after the environment removal process and distance correction. Fig. 14 shows graphs of the found linear approximation formula. Graph G13h is a graph of the linear approximation formula for graph G12h. Graph G13d is a graph of the linear approximation formula for graph G12d. Fig. 15 shows graphs of the found quadratic approximation formula. Graph G14h is a graph of the quadratic approximation formula for graph G12h. Graph G14d is a graph of the quadratic approximation formula for graph G12d. In the approximation formula creation step S25, a linear approximation formula or a quadratic approximation formula is found for the second measurement data. Here, this is performed for the second measurement data after the environment removal process and distance correction. Fig. 14 shows a graph of the found linear approximation formula. Graph G23h is a graph of the linear approximation formula for graph G22h. Graph G23d is a graph of the linear approximation formula for graph G22d. Fig. 15 shows a graph of the found quadratic approximation formula. Graph G24h is a graph of the quadratic approximation formula for graph G22h. Graph G24d is a graph of the quadratic approximation formula for graph G22d. It should be noted that whether to obtain a linear approximation formula or a quadratic approximation formula may be selected.

[0032] Next, approximate equation correction steps S16 and S26 are executed. In the approximate equation correcting step S16, the value of the approximate equation obtained in the approximate equation creating step S15 is subtracted from the first measurement data. In the case of a linear approximation equation, the measurement value of the same X coordinate of graph G13h is subtracted from the measurement value of graph G12h to obtain graph G15h shown in Fig. 16. Similarly, the measurement value of the same X coordinate of graph G13d is subtracted from the measurement value of graph G12d to obtain graph G15d shown in Fig. 16. In the case of a quadratic approximation equation, the measurement value of the same X coordinate of graph G14h is subtracted from the measurement value of graph G12h to obtain graph G16h shown in Fig. 17. Similarly, the measurement value of the same X coordinate of graph G14d is subtracted from the measurement value of graph G12d to obtain graph G16d shown in Fig. 17. In the approximate equation correcting step S26, the value of the approximate equation obtained in the approximate equation creating step S25 is subtracted from the second measurement data. In the case of a linear approximation equation, the measurement value of the same X coordinate of graph G23h is subtracted from the measurement value of graph G22h to obtain graph G25h shown in Fig. 16. Similarly, the measurement value of the same X coordinate of graph G23d is subtracted from the measurement value of graph G22d to obtain graph G25d shown in Fig. 16. In the case of a quadratic approximation equation, the measurement value of the same X coordinate of graph G24h is subtracted from the measurement value of graph G22h to obtain graph G26h shown in Fig. 17. Similarly, the measurement value of the same X coordinate of graph G24d is subtracted from the measurement value of graph G22d to obtain graph G26d shown in Fig. 17. 16 and 17, the approximate formula correction steps S16 and S26 eliminate the upward or upward slope of the entire graph, making it easier to read signal components that change depending on the state of the inspection target 8. It is possible to eliminate the overall slope of the graph that could not be completely eliminated by the distance correction described above.

[0033] Next, the waveform synthesis step S30 is executed. In the waveform synthesis step S30, the judgment data is synthesized based on the first measurement data after the approximate equation correction step S16 and the second measurement data after the approximate equation correction step S26. Here, a difference calculation is performed as the synthesis operation. When the linear approximation equation is adopted, the measurement value of the same X coordinate of graph G25h is subtracted from the measurement value of graph G15h to obtain graph G31h shown in Fig. 18. Similarly, the measurement value of the same X coordinate of graph G25d is subtracted from the measurement value of graph G15d to obtain graph G31d shown in Fig. 18. When the quadratic approximation formula is adopted, the measurement value of the same X coordinate of graph G26h is subtracted from the measurement value of graph G16h to obtain graph G32h shown in Fig. 19. Similarly, the measurement value of the same X coordinate of graph G26d is subtracted from the measurement value of graph G16d to obtain graph G32d shown in Fig. 19.

[0034] Next, a determination step S31 is executed. In the determination step S31, the presence or absence of an abnormality in the inspection object and, if an abnormality is present, the location of the abnormality are determined. First, the judgment data at the time of the inspection is compared with the judgment data (graph G31h or G32h) when the inspection target 8 is healthy to judge whether or not the inspection target 8 is abnormal. For example, assume that the graph displaying the judgment data at the time of the inspection is graph G31d (or G32d). As shown in FIG. 18 (FIG. 19), the graph G31d (G32d) is significantly separated from the graph G31h (G32h) when the inspection target 8 is healthy. This is evaluated quantitatively to judge that the inspection target 8 is abnormal. Looking more closely, the positive peak P1 and the negative peak P2 of the graph G31h (G32h) appear significantly separated from the graph G31h (G32h) when the inspection target 8 is healthy. This is evaluated quantitatively to judge that the inspection target 8 is abnormal. In addition, the position P0 between the positive peak P1 and the negative peak P2 of the judgment data at the time of the inspection, which is 0 value, is judged to be the abnormal part of the inspection target 8. This allows the location of an abnormality in the inspection object 8 to be determined accurately.

[0035] The judgment step S31 may be executed by the cloud computer 9 itself, functioning as the judgment means and calculating it (automatic judgment function). In this case, the judgment result (presence or absence of anomaly and its location) is displayed to the user via the portable computer 4 or the like. Alternatively, the data for determination may be displayed (eg, displayed as a graph) to the user via the portable computer 4 or the like, and the user may execute the determination step S31 by viewing the data for determination. Of course, the result of the automatic determination function and the data for determination may be displayed.

[0036] The measuring device 1 may also have a means for executing the above-mentioned judgment data calculation steps (S13-16, S23-26, S30), and may be capable of externally outputting the judgment data calculated by the measuring device 1 itself. Furthermore, the measuring device 1 may also have a judgment means, and may be capable of externally outputting the judgment results. This external output may be displayed on a display device provided in the measuring device 1 itself, may be to the cloud computer 9, or may be to a portable computer directly connected without going through the cloud computer 9. In any case, this is because the user can refer to the judgment data and the judgment results.

[0037] [Actions, Effects, and Others] According to the embodiment of the present invention described above, in non-destructive testing using magnetism, while following the measurement method in which a magnetic field application unit is placed on only one side of a magnetic sensor, a new measurement method is used in which a magnetic field application unit 3 is placed on one side of a sensor unit 2 for measurement, and a magnetic field application unit 3 is placed on the other side of the sensor unit 2 for measurement. This strengthens the magnetic field component originating from the object to be inspected 8, making it easier to determine whether or not the object to be inspected 8 is damaged and where the damage is located. As shown in the graphs of Fig. 16 or 17, the magnetic field H2 that rises in the center is the magnetic field leaking from the test object 8 between the cross stirrups 5L, 5R. The magnetic fields H3L, H3R that are convex downward on both sides of the magnetic field H2 are the changed parts due to the influence of the cross stirrups 5L, 5R. Since the change caused by the break occurs symmetrically as shown in Fig. 16(b) or Fig. 17(b), this change appears prominently by acquiring the first measurement data applied to one side and the second measurement data applied to the other side. Therefore, as shown in Fig. 18 or Fig. 19, the signal components that change depending on the state of the test object 8 can be clearly extracted, making it easy to determine whether the test object is damaged and where the damage is located. Furthermore, as shown in FIG. 18 or 19, the magnetic fields H3L, H3R of the changing portions due to the influence of the intersecting stirrups 5L, 5R are cancelled out, making it easier to read the signal components that change depending on the state of the inspection object 8. For example, as can be seen by only looking at the graph G11d with a break shown in Fig. 12(b), the characteristics of the waveform change (H3R) due to the absorption of magnetic force by the crossing rebars (5) and the waveform change due to a break are similar, making it difficult to determine a break based on the waveform change. For example, there is a risk of misjudging that a break exists at the position of H3R by looking at the graph G11h for a healthy state shown in Fig. 12(a), or misjudging the judgment point of the graph G11d with a break shown in Fig. 12(b) as the position of H3R. In contrast, according to the embodiment of the present invention described above, it is easy to determine whether or not the inspection object 8 is damaged and where the damage is located, as in the example where the determination is made with reference to the graph shown in FIG. 18 or FIG. As described above, the determination accuracy of non-destructive testing can be improved.

[0038] In the above embodiment, measurements have been described when there is an intersecting rebar (5) between the object to be inspected 8 and the sensor unit 2, but the present invention can also be implemented when there is no such intersecting rebar, and the effect of strengthening the magnetic field component originating from the object to be inspected can be obtained based on the first measurement data and the second measurement data. The above measurement data may be measurement data obtained by the main sensor 21M, or may be data constructed by performing correction calculations based on the measurement data obtained by the main sensor 21M and the measurement data obtained by the reference sensor 21R.

[0039] Regardless of the above embodiment, the information processing device that performs the process of making the magnetic field components derived from the test object visible is not limited to the cloud computer 9, and may be any hardware configuration, such as a computer connected one-to-one to the measurement device 1 or a computer integrated into the measurement device 1. Processing at a single station on the cloud computer 9 is advantageous in terms of information accumulation, uniform processing, utilization, etc. In the above embodiment, the magnetic sensor 21 is of the scanning type in the X direction and of the sensor array type in the Y direction. However, the sensor unit 2 may also be configured of a sensor array type in the X direction, that is, the sensor unit 2 may be configured such that a magnetic field distribution along the first direction X according to the distance from the magnetic field application unit 3 is obtained by configuring a plurality of magnetic sensors 21 arranged in the first direction X on the housing 26. Furthermore, the sensor unit 2 may be configured to scan in both the X and Y directions. Furthermore, in the above embodiment, a configuration is used in which two-dimensional distribution data having a plurality of rows in the X direction and the Y direction is acquired, but it may also be implemented as a configuration in which one-dimensional distribution data having one row in the X direction is acquired. Also, instead of arranging two magnetic sensors 21 in the Z direction, only a single magnetic sensor (main sensor) may be used in the Z direction. [Explanation of symbols]

[0040] 1. Non-destructive testing measuring equipment 2 Sensor Unit 3 Magnetic field application unit 5 Cross Stirrup 8. Inspection subject 8B Breaking part 9. Cloud Computer (Information Processing Device) 10. Non-destructive Inspection Systems 21 Magnetic Sensor 25 Control section 26 Case 26L Holder 26R Holder 27 Sensor Scanning Mechanism

Claims

1. A non-destructive testing measuring device for testing a magnetic material contained in a non-magnetic body, A magnetic field application unit that applies a magnetic field and a sensor unit that measures the magnetic field, the magnetic field application unit is detachably attached to one end and the other end of the sensor unit along a first direction, The sensor unit is capable of measuring magnetic fields at a plurality of different positions along at least a first direction, and is capable of outputting measurement data by the sensor unit to an external device; First measurement data measured by the sensor unit in a state where the magnetic field application unit is disposed at one end and is not disposed at the other end; Second measurement data measured by the sensor unit in a state in which the magnetic field application unit is disposed at the other end and is not disposed at the one end; and A means for calculating judgment data based on the A non-destructive testing measuring device capable of outputting the judgment data to an external device.

2. 2. The non-destructive testing measuring device according to claim 1, wherein the magnetic field application unit detachably attached to the one end portion and the magnetic field application unit detachably attached to the other end portion are the same and can be shared.

3. 3. The non-destructive inspection measuring device according to claim 1, wherein the sensor unit has a magnetic sensor capable of detecting magnetic fields in three axial directions.

4. 4. A non-destructive testing measuring device as described in any one of claims 1 to 3, wherein the sensor unit has a plurality of magnetic sensors arranged two-dimensionally in the first direction and a second direction perpendicular to the first direction.

5. First measurement data measured by the sensor unit in a state in which the magnetic field application unit is disposed at the one end and is not disposed at the other end; and Second measurement data measured by the sensor unit in a state in which the magnetic field application unit is disposed at the other end and is not disposed at the one end; and 5. The non-destructive inspection measuring device according to claim 1, wherein the measurement result is output to an external device.

6. A non-destructive inspection method in which a magnetic material contained in a non-magnetic body is used as an object to be inspected, comprising the steps of: a measurement data acquisition process in which a magnetic field of a first polarity, which is N or S, is applied from a magnetic field application unit to the test object from a surface of the non-magnetic body, and measurement data is acquired by measuring the magnetic field from the test object in a state in which the magnetic field from the test object forms a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit, at a plurality of positions at different distances from the magnetic field application unit along a first direction moving away from the magnetic field application unit, using a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit; and a judgment data calculation step of calculating judgment data for judging a state of the inspection object based on the measurement data acquired in the measurement data acquisition step, In the measurement data acquisition step, First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from the plurality of positions measured by the magnetic sensor; and and acquiring second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor; A non-destructive inspection method, wherein in the determination data calculation step, determination data is synthesized based on the first measurement data and the second measurement data.

7. In the measurement data acquisition step, Obtaining complementary measurement data measured under a condition in which the magnetic field applied to the test object by the magnetic field application unit is excluded; 7. The nondestructive inspection method according to claim 6, wherein in the judgment data calculation step, the complementary measurement data is subtracted from the first measurement data, the complementary measurement data is subtracted from the second measurement data, and the judgment data is synthesized based on the data after the subtraction.

8. the complementary measurement data to be subtracted from the first measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the one side after the first measurement data is measured, 8. The non-destructive inspection method according to claim 7, wherein the complementary measurement data to be subtracted from the second measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the other side after the second measurement data is measured.

9. 8. The nondestructive inspection method according to claim 7, wherein the complementary measurement data subtracted from the first measurement data and the complementary measurement data subtracted from the second measurement data are the same.

10. 10. The non-destructive inspection method according to claim 6, wherein in the judgment data calculation step, a distance correction is performed on the first measurement data to alleviate a decrease in magnetic field depending on the distance from the magnetic field application unit on the one side, and a distance correction is performed on the second measurement data to alleviate a decrease in magnetic field depending on the distance from the magnetic field application unit on the other side, and the judgment data is synthesized based on the data after the distance correction.

11. 11. The nondestructive inspection method according to claim 10, wherein the distance correction comprises a calculation of multiplying the measured value at the distance by the Nth power of the distance.

12. 12. The nondestructive inspection method according to claim 6, wherein in the judgment data calculation step, a linear approximation equation or a quadratic approximation equation is found for the first measurement data, a value of the approximation equation is subtracted from the first measurement data, a linear approximation equation or a quadratic approximation equation is found for the second measurement data, a value of the approximation equation is subtracted from the second measurement data, and the judgment data is synthesized based on the data after the subtraction.

13. Based on the judgment data at the time of inspection, the presence or absence of an abnormality in the inspection object is judged, 13. A non-destructive inspection method according to claim 6, wherein, if an abnormality is detected, a position between the positive peak and the negative peak of the judgment data during the inspection, which is a zero value, is judged to be an abnormal portion of the object to be inspected.

14. An information processing device for non-destructive testing using a computer with a magnetic material contained in a non-magnetic body as an object to be tested, The computer includes: a measurement data acquiring means for acquiring measurement data obtained by applying a magnetic field of a first polarity, which is N or S, from a magnetic field application unit to the test object from a surface of the non-magnetic body, the measurement data being acquired at a plurality of positions at different distances from the magnetic field application unit along a first direction away from the magnetic field application unit by a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit, the magnetic field from the test object forming a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit; a determination data calculation means for calculating determination data for determining a state of the inspection object based on the measurement data acquired by the measurement data acquisition means; The measurement data acquisition means First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from the plurality of positions measured by the magnetic sensor; and It is possible to obtain second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor, The judgment data calculation means is an information processing device for non-destructive testing capable of synthesizing judgment data based on the first measurement data and the second measurement data.

15. The measurement data acquisition means It is possible to obtain complementary measurement data measured under conditions in which the magnetic field applied to the test object by the magnetic field application unit is excluded, 15. An information processing apparatus for non-destructive testing according to claim 14, wherein the judgment data calculation means is capable of subtracting the complementary measurement data from the first measurement data, subtracting the complementary measurement data from the second measurement data, and synthesizing the judgment data based on the data after the subtraction.

16. the complementary measurement data to be subtracted from the first measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the one side after the first measurement data is measured, 16. An information processing apparatus for non-destructive testing according to claim 15, wherein the complementary measurement data to be subtracted from the second measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the other side after the second measurement data is measured.

17. The information processing apparatus for non-destructive inspection according to claim 15 , wherein the complementary measurement data subtracted from the first measurement data and the complementary measurement data subtracted from the second measurement data are the same.

18. 18. A non-destructive inspection information processing device as described in any one of claims 14 to 17, wherein the judgment data calculation means performs distance correction on the first measurement data to mitigate the decrease in magnetic field depending on the distance from the magnetic field application unit on the one side, performs distance correction on the second measurement data to mitigate the decrease in magnetic field depending on the distance from the magnetic field application unit on the other side, and is capable of synthesizing the judgment data based on the data after the distance correction.

19. 19. An information processing apparatus for non-destructive inspection according to claim 18, wherein said judgment data calculation means is capable of performing a calculation to multiply the measured value at said distance by the Nth power of said distance as said distance correction.

20. 20. The information processing device for non-destructive testing according to any one of claims 14 to 19, wherein the judgment data calculation means is capable of finding a linear approximation equation or a quadratic approximation equation for the first measurement data, subtracting the value of the found approximation equation from the first measurement data, finding a linear approximation equation or a quadratic approximation equation for the second measurement data, subtracting the value of the found approximation equation from the second measurement data, and synthesizing the judgment data based on the data after the subtraction.

21. The computer functions as a determining means, The determination means is An information processing device for non-destructive inspection as described in any one of claims 14 to 20, which is capable of judging the presence or absence of an abnormality in the object to be inspected based on the judgment data during inspection, and, if an abnormality is present, judging a position of zero value between the positive peak and the negative peak of the judgment data during the inspection to be the abnormal part of the object to be inspected.

22. A computer program for causing a computer to function as an information processing device for non-destructive testing in which a magnetic material contained in a non-magnetic body is an object to be tested, comprising: The computer, a measurement data acquiring means for acquiring measurement data obtained by applying a magnetic field of a first polarity, which is N or S, from a magnetic field application unit to the test object from a surface of the non-magnetic body, the measurement data being acquired at a plurality of positions at different distances from the magnetic field application unit along a first direction away from the magnetic field application unit by a magnetic sensor on the surface of the non-magnetic body adjacent to the magnetic field application unit, the magnetic field from the test object forming a magnetic field distribution in which the magnetic field attenuates within the range of the first polarity as it moves away from the magnetic field application unit; functioning as a judgment data calculation means for calculating judgment data for judging a state of the inspection object based on the measurement data acquired by the measurement data acquisition means; The measurement data acquisition means First measurement data measured by disposing the magnetic field application unit at an application position on one side of the first direction from the plurality of positions measured by the magnetic sensor; and It is possible to obtain second measurement data measured by disposing the magnetic field application unit at an application position on the other side of the first direction from the plurality of positions measured by the magnetic sensor, The judgment data calculation means is an information processing program for non-destructive testing capable of synthesizing judgment data based on the first measurement data and the second measurement data.

23. The measurement data acquisition means It is possible to obtain complementary measurement data measured under conditions in which the magnetic field applied to the test object by the magnetic field application unit is excluded, 23. An information processing program for non-destructive testing as described in claim 22, wherein the judgment data calculation means is capable of subtracting the complementary measurement data from the first measurement data, subtracting the complementary measurement data from the second measurement data, and synthesizing the judgment data based on the data after the subtraction.

24. the complementary measurement data to be subtracted from the first measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the one side after the first measurement data is measured, The non-destructive testing information processing program according to claim 23, wherein the complementary measurement data to be subtracted from the second measurement data is measurement data measured in a state in which the magnetic field application unit is removed from the application position on the other side after the second measurement data is measured.

25. The complementary measurement data to be subtracted from the first measurement data and the complementary measurement data to be subtracted from the second measurement data 24. The non-destructive inspection information processing program according to claim 23, wherein the complementary measurement data is the same as the complementary measurement data.

26. The judgment data calculation means performs distance correction on the first measurement data to mitigate the decrease in magnetic field depending on the distance from the magnetic field application unit on the one side, performs distance correction on the second measurement data to mitigate the decrease in magnetic field depending on the distance from the magnetic field application unit on the other side, and is capable of synthesizing the judgment data based on the data after the distance correction.

27. 27. The information processing program for non-destructive testing according to claim 26, wherein the judgment data calculation means is capable of performing a calculation to multiply the measured value at the distance by the Nth power of the distance as the distance correction.

28. 28. The information processing program for non-destructive testing according to any one of claims 22 to 27, wherein the judgment data calculation means is capable of finding a linear approximation equation or a quadratic approximation equation for the first measurement data, subtracting the value of the found approximation equation from the first measurement data, finding a linear approximation equation or a quadratic approximation equation for the second measurement data, subtracting the value of the found approximation equation from the second measurement data, and synthesizing the judgment data based on the data after the subtraction.

29. The computer functions as a determining means, The determination means is An information processing program for non-destructive testing as described in any one of claims 22 to 28, which is capable of judging the presence or absence of an abnormality in the object to be tested based on the judgment data during the test, and, if an abnormality is present, judging a position of zero value between the positive peak and the negative peak of the judgment data during the test to be the abnormal part of the object to be tested.

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