Calibration module and splicing calibration device

Abstract

The present invention relates to the field of detection calibration technology, and provides a calibration module and a splicing calibration device, wherein the calibration module comprises: three unit sheets; the three unit sheets have the same structure, each unit sheet comprises a connecting sheet and a reflecting sheet, the connecting sheet in each unit sheet is connected to the reflecting sheet, and the shape of the reflecting sheet is triangular; the reflecting sheet of any one unit sheet is respectively connected to the reflecting sheets of the other two unit sheets, and the shape formed by the reflecting sheets of the three unit sheets is a triangular pyramid; the connecting sheet is used to be selectively connected to any one of the three connecting sheets of another calibration module; the calibration module of the present invention can realize on-demand splicing of multiple calibration modules through the mutual connection of the connecting sheets, so as to better simulate the detection target of the characteristic shape.

Description

Technical Field

[0001] The present invention relates to the technical field of detection and calibration, and in particular to a calibration module and a splicing calibration device. Background Art

[0002] Before being put into use, detection equipment needs to be calibrated and calibrated with the help of a calibration device to ensure the detection accuracy of the detection equipment. In order to improve the accuracy of the calibration and calibration of the detection equipment, the calibration device is usually set to a shape similar to the shape of the detection target, so as to better simulate the detection target. Therefore, the shape of the existing calibration device is relatively fixed, and it is difficult to simulate detection targets of different shapes, and the versatility and flexibility are poor. Summary of the Invention

[0003] The present invention provides a calibration module and a splicing calibration device, which are used to solve or improve the problem of poor versatility and flexibility of existing calibration devices due to fixed shapes.

[0004] The present invention provides a calibration module, comprising: three unit sheets; the three unit sheets have the same structure, each of the unit sheets comprises a connecting sheet and a reflecting sheet, the connecting sheet is connected to the reflecting sheet, and the shape of the reflecting sheet is triangular; the reflecting sheet of any one of the unit sheets is respectively connected to the reflecting sheets of the other two unit sheets, and the shape formed by the reflecting sheets of the three unit sheets is a triangular pyramid; the connecting sheet is used to selectively connect to any one of the three connecting sheets of another calibration module.

[0005] According to a calibration module provided by the present invention, any two of the three reflective sheets are perpendicular to each other.

[0006] According to a calibration module provided by the present invention, the shape of the reflector is an isosceles right triangle, the vertex angles of the three reflectors coincide, and in any two adjacent reflectors, the right-angled side of one reflector is connected to the right-angled side of the other reflector.

[0007] According to a calibration module provided by the present invention, the three reflective sheets are all used to form a preset angle with the horizontal plane, and the three connecting sheets are all used to be perpendicular to the horizontal plane.

[0008] According to a calibration module provided by the present invention, the manufacturing method of the unit chip includes:

[0009] Take a square plate with a side length of a, and the vertices of the four right angles of the square plate are A, B, C and D respectively;

[0010] Take a point E on the side BC and a point F on the side CD so that the lengths of CE and CF are equal, both L, and L is greater than 0 and less than or equal to Cut the triangle CEF along the line connecting point E and point F, the triangle ABD is the reflector, and the isosceles trapezoid EFDB is the connecting piece;

[0011] Bend along the line connecting point B and point D, the dihedral angle between plane ABD and plane EFDB is

[0012]

[0013] According to a calibration module provided by the present invention, the manufacturing method of the unit chip includes:

[0014] Take a rectangular plate with a width of a and a length of b. The four right-angled vertices of the rectangular plate are A, B, C and D, respectively. The lengths of the AB and CD sides are b, the lengths of the BC and DA sides are a, and a and b satisfy

[0015] Take a point E on the side AB, so that the length of AE is a, and take a point F on the side CD, so that the length of CF is a. Cut from point E along the line connecting point E and point D to point E1, and from point F along the line connecting point F and point B to point F1. The lengths of EE1 and FF1 are equal and both are less than Cut along the line connecting point E1 and point F1 to obtain two unit sheets of the same shape and size. The two unit sheets are a hexagon AEE1F1FD and a hexagon CFF1E1EB. In the hexagon AEE1F1FD, the triangle ADE is the reflector, and the quadrilateral DE1F1F is the connecting sheet. In the hexagon CFF1E1EB, the triangle CBF is the reflector, and the quadrilateral BF1E1E is the connecting sheet.

[0016] Bend along the line connecting point D and point E, the dihedral angle between plane ADE and plane DE1F1F is Bend along the line connecting point B and point F, the dihedral angle between plane CBF and plane BF1E1E is

[0017] According to a calibration module provided by the present invention, a microwave reflection layer and an optical reflection layer are provided on the reflection plate, the optical reflection layer is provided on the microwave reflection layer, the microwave reflection layer is used to reflect microwaves emitted by the radar, and the optical reflection layer is used to reflect light toward the optical imaging device.

[0018] According to a calibration module provided by the present invention, the microwave reflection layer has a first calibration surface, the optical reflection layer has a second calibration surface, the first calibration surface is divided into multiple first calibration areas, and the second calibration surface is divided into multiple second calibration areas; among the multiple first calibration areas, at least two of the first calibration areas have different standard values ​​of microwave reflection characteristics; and among the multiple second calibration areas, at least two of the second calibration areas have different standard values ​​of optical reflection spatial distribution characteristics.

[0019] According to a calibration module provided by the present invention, a plurality of grooves are provided on the microwave reflecting layer, and side walls of the plurality of grooves jointly form the first calibration surface.

[0020] The present invention also provides a splicing calibration device, comprising: a plurality of calibration modules as described above; among any two adjacent calibration modules, the connecting piece of one calibration module is connected to the connecting piece of the other calibration module.

[0021] The present invention provides a calibration module and a splicing calibration device, wherein the calibration module is composed of three unit sheets, and three triangular reflective sheets are formed into a triangular pyramid shape, that is, two adjacent reflective sheets form a certain angle, so that the three reflective sheets form a corner reflector structure, thereby meeting the detection requirements of the detection equipment; each reflective sheet is connected to a connecting sheet, and when it is necessary to simulate a detection target of a specific shape, multiple calibration modules are spliced ​​together, that is, among two adjacent calibration modules, the connecting sheet of one calibration module is connected to the connecting sheet of the other calibration module. Since a calibration module has three connecting sheets, a maximum of three calibration modules can be spliced ​​on one calibration module. A calibration module is connected to the corresponding connecting sheet as needed to obtain splicing calibration devices of different shapes, thereby better simulating a detection target of a specific shape. The calibration module has good flexibility and versatility, and ensures the accuracy of calibration and calibration of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is one of the structural diagrams of the calibration module provided by the present invention;

[0024] Figure 2 This is the second structural diagram of the calibration module provided by the present invention;

[0025] Figure 3 This is one of the cutting schematic diagrams of the method for manufacturing a unit sheet provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the unit sheet provided by the present invention after bending;

[0027] Figure 5 This is the second cutting diagram of the method for manufacturing a unit sheet provided by the present invention;

[0028] Figure 6 Schematic diagram of the structure of the reflector provided by the present invention;

[0029] Figure 7 This is one of the structural diagrams of the splicing type calibration device provided by the present invention;

[0030] Figure 8 This is the second structural diagram of the splicing calibration device provided by the present invention.

[0031] Reference numerals:

[0032] 1: unit chip; 11: connecting chip; 12: reflecting plate; 2: microwave reflecting layer; 21: first calibration area; 22: groove; 3: optical reflecting layer; 31: second calibration area. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the embodiments of the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0036] The following combination Figures 1 to 8 The present invention describes a calibration module and a splicing calibration device.

[0037] like Figure 1 and Figure 2 As shown, the calibration module shown in this embodiment includes three unit chips 1.

[0038] The three unit chip bodies 1 have the same structure. Each unit chip body 1 includes a connecting piece 11 and a reflecting piece 12, that is, each calibration module includes three connecting pieces 11 and three reflecting pieces 12. The connecting piece 11 in each unit chip body 1 is connected to the reflecting piece 12, and the shape of the reflecting piece 12 is triangular; the reflecting piece 12 of any one unit chip body 1 is respectively connected to the reflecting pieces 12 of the other two unit chip bodies 1, and the shape surrounded by the reflecting pieces 12 of the three unit chip bodies 1 is a triangular pyramid; the connecting piece 11 is used to selectively connect to any one of the three connecting pieces 11 of another calibration module.

[0039] Specifically, the calibration module shown in this embodiment is surrounded by three unit sheets 1, and three triangular reflective sheets 12 are surrounded by a triangular pyramid shape, that is, two adjacent reflective sheets 12 are at a certain angle, so that the three reflective sheets 12 form a corner reflector structure to meet the detection requirements of the detection equipment; each reflective sheet 12 is connected to a connecting sheet 11. When it is necessary to simulate a detection target of a specific shape, multiple calibration modules are spliced ​​together, that is, among two adjacent calibration modules, the connecting sheet 11 of one calibration module is connected to the connecting sheet 11 of the other calibration module. Since there are three connecting sheets 11 on a calibration module, a maximum of three calibration modules can be spliced ​​on one calibration module. By connecting a calibration module to the corresponding connecting sheet 11 as needed, splicing calibration devices of different shapes can be obtained, thereby better simulating a detection target of a specific shape. The calibration module has good flexibility and versatility, which ensures the accuracy of calibration and calibration of the detection equipment.

[0040] In some embodiments, as Figure 1 and Figure 2 As shown, any two of the three reflective sheets 12 shown in this embodiment are perpendicular to each other, that is, the shape formed by the three reflective sheets 12 is a right-angled triangular pyramid.

[0041] In some embodiments, as Figure 1 and Figure 2 As shown, the reflector 12 shown in this embodiment is in the shape of an isosceles right triangle, and the top angles of the three reflectors 12 coincide. In any two adjacent reflectors 12, the right-angled side of one reflector 12 is connected to the right-angled side of the other reflector 12, and the base sides of the three reflectors 12 together form the bottom surface of a right triangular pyramid, and the top angles of the three reflectors 12 together form the apex of a right triangular pyramid.

[0042] Furthermore, during the use of the calibration module, the calibration module needs to be fixed on the ground. At this time, the bottom surface of the right triangular pyramid should be parallel to the horizontal plane. Accordingly, each reflector 12 is at a preset angle to the horizontal plane. After calculation, the preset angle is

[0043] In some embodiments, the three connecting pieces 11 shown in this embodiment are all perpendicular to the horizontal plane. Therefore, when two calibration modules are spliced ​​together, the bottom surfaces of the two right-angled triangular pyramids can be kept parallel to the horizontal plane by fitting the two connecting pieces 11 together.

[0044] The following combination Figures 3 to 5 Two methods for manufacturing the unit cell 1 are described.

[0045] For the first method of manufacturing the unit cell 1, such as Figure 3 As shown, take a square plate with a side length of a. The vertices of the four right angles of the square plate are A, B, C and D respectively.

[0046] Take a point E on the BC side and a point F on the CD side, so that the lengths of CE and CF are equal, both L, that is, triangle CEF is an isosceles right triangle, where the value range of L is The triangle CEF is cut along the line connecting point E and point F, thereby obtaining a pentagonal unit sheet ABEFD before bending. The triangle ABD is the reflector sheet 12 , and the isosceles trapezoid EFDB is the connecting sheet 11 .

[0047] Bend along the line connecting point B and point D to obtain a bent unit sheet 1. The dihedral angle θ between plane ABD and plane EFBD is That is, the bending angle is Thus, after connecting the three bent unit sheets 1, the following can be obtained: Figure 1 In the calibration module shown, the bottom surface of the right-angled triangular pyramid formed by the three unit sheets 1 can be parallel to the horizontal plane, and the connecting sheet 11 can be perpendicular to the horizontal plane.

[0048] The following combination Figure 4 The basis for the range of L values ​​is explained. Figure 3 The pentagonal unit sheet in ABEFD is bent to obtain Figure 4 In the bending structure, the connecting piece 11 not only serves to connect another calibration module, but also serves to support the calibration module. Therefore, it is necessary to ensure that the support height h of the connecting piece 11 is not less than the height of the right triangular pyramid to prevent the calibration module from tipping over. In the case where the support height h of the connecting piece 11 is greater than the height of the right triangular pyramid, the EF side can be inserted into the soil so that the vertex of the right triangular pyramid is located on the horizontal plane; the support height h of the connecting piece 11 is Figure 3 The length of OG in the figure is calculated, and the height of the right triangular pyramid is Then OG should be greater than or equal to Accordingly, CG should be less than or equal to Then CE should be less than or equal to

[0049] The first method of manufacturing the unit sheet 1 is equivalent to cutting a corner from a square plate and then bending it. The square plate can be cut from a whole plate. Since the shape of the square plate is relatively regular, the utilization rate of the whole plate is high, avoiding the waste of scraps.

[0050] For the second method of making the unit sheet, such as Figure 5 As shown, take a rectangular plate with a width of a and a length of b. The four right-angled vertices of the rectangular plate are A, B, C and D respectively. The lengths of the AB and CD sides are b, the lengths of the BC and DA sides are a, and a and b satisfy

[0051] Take a point E on the side AB, so that the length of the side AE ​​is a, and take a point F on the side CD, so that the length of CF is a. Cut from point E along the line connecting point E and point D to point E1, and from point F along the line connecting point F and point B to point F1. The lengths of EE1 and FF1 are equal and both are less than Cut along the line connecting point E1 and point F1 to obtain two unit sheets 1 of the same shape and size before bending. The two unit sheets 1 are a hexagon AEE1F1FD and a hexagon CFF1E1EB. In the hexagon AEE1F1FD, the triangle ADE is the reflector 12, and the quadrilateral DE1F1F is the connecting sheet 11. In the hexagon CFF1E1EB, the triangle CBF is the reflector 12, and the quadrilateral BF1E1E is the connecting sheet 11.

[0052] Bend along the line connecting point D and point E, the dihedral angle θ between plane ADE and plane DE1F1F is That is, the bending angle is The dihedral angle between plane CBF and plane BF1E1E is That is, the bending angle is Thus, after connecting the three bent unit sheets 1, the following can be obtained: Figure 2 In the calibration module shown, the bottom surface of the right-angled triangular pyramid formed by the three unit sheets 1 can be parallel to the horizontal plane, and the connecting sheet 11 can be perpendicular to the horizontal plane.

[0053] The following is an explanation of the basis for the range of values ​​of the length b. As mentioned above, it is necessary to ensure that the support height h of the connecting piece 11 is not less than the height of the right triangular pyramid. In the case where the support height h of the connecting piece 11 is greater than the height of the right triangular pyramid, taking the hexagon AEE1F1FD as an example, the FF1 side can be inserted into the soil so that the vertex of the right triangular pyramid is on the horizontal plane; Figure 5 In the figure, the support height h of the connecting piece 11 is the length of FH. After calculation, the height of the right triangular pyramid is Then FH should be greater than or equal to Accordingly, DF should be greater than or equal to Then the length of CD side should be greater than or equal to Right now

[0054] In addition, although the FF1 side can be inserted into the soil when the support height of the connecting piece 11 is greater than the height of the right triangular pyramid, the applicant found during the research and development process that the support height of the connecting piece 11 cannot be too large, otherwise the three connecting pieces 11 in the calibration module are prone to interference, that is, the value of b cannot be too large and must satisfy b≤3a.

[0055] The second method of making the unit sheet 1 is equivalent to cutting a rectangular plate in a Z shape and then bending it. Two unit sheets 1 with exactly the same shape and size can be obtained in one cutting. The rectangular plate can be cut from a whole plate. Since the shape of the rectangular plate is relatively regular, the utilization rate of the whole plate is higher, avoiding the waste of scraps.

[0056] In some embodiments, as Figure 6 As shown, the reflective sheet 12 shown in this embodiment is provided with a microwave reflective layer 2 and an optical reflective layer 3. The optical reflective layer 3 is provided on the microwave reflective layer 2. The microwave reflective layer 2 is used to reflect microwaves emitted by the radar, and the optical reflective layer 3 is used to reflect light toward the optical imaging device.

[0057] Specifically, by simultaneously setting the microwave reflection layer 2 and the optical reflection layer 3 on the reflective plate 12, the calibration module can calibrate and calibrate the radar and optical imaging equipment at the same time, ensuring the versatility of the calibration module. Accordingly, the detection equipment at this time is the radar and the optical imaging equipment.

[0058] In some embodiments, as Figure 6As shown, the microwave reflecting layer 2 shown in this embodiment has a first calibration surface, and the optical reflecting layer 3 has a second calibration surface. The first calibration surface is divided into a plurality of first calibration areas 21, and the second calibration surface is divided into a plurality of second calibration areas 31. Each first calibration area 21 has a standard value for microwave reflection characteristics, and each second calibration area 31 has a standard value for optical reflection spatial distribution characteristics. That is, each first calibration area 21 and each second calibration area 31 are pre-assigned values. At least two of the plurality of first calibration areas 21 have different standard values ​​for microwave reflection characteristics. It can be understood that the microwave reflection characteristics of the plurality of first calibration areas 21 are not completely identical, thereby more comprehensively assisting the radar in completing calibration and calibration testing of various performance parameters. At least two of the plurality of second calibration areas 31 have different standard values ​​for optical reflection spatial distribution characteristics. It can be understood that the light reflection characteristics of the plurality of second calibration areas 31 are not completely identical, thereby more comprehensively assisting the optical imaging device in completing calibration and calibration testing of various performance parameters.

[0059] In some embodiments, as Figure 6 As shown, the microwave reflecting layer 2 shown in this embodiment is provided with a plurality of grooves 22, and the side walls of the plurality of grooves 22 together form a first calibration surface, wherein the grooves 22 are in the shape of a triangular pyramid, that is, the side walls of the grooves 22 are all inclined surfaces. The first calibration surface formed by the side walls of the grooves 22 has a larger reflection area than a plane, thereby improving the calibration effect of the calibration module.

[0060] like Figures 7 and 8 As shown, this embodiment further provides a splicing calibration device, comprising: a plurality of calibration modules as described above; among any two adjacent calibration modules, the connecting piece 11 of one calibration module is connected to the connecting piece 11 of the other calibration module.

[0061] Specifically, the connection between the two calibration modules is achieved by fitting the connecting pieces 11 of two adjacent calibration modules together. Each calibration module can be connected to up to three other calibration modules at the same time. At the same time, the bottom surfaces of the right-angled triangular pyramids formed by each calibration module are overlapped. By splicing multiple calibration modules into a specific shape to simulate the shape of the target to be measured as much as possible, it is beneficial to improve the calibration and calibration accuracy of the detection device. Compared with the existing calibration device with a fixed shape, the splicing calibration device of this embodiment can be obtained by the free combination of calibration modules, and accordingly, it has better flexibility and versatility.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for manufacturing a calibration module, characterized in that: The calibration module includes: three unit sheets; The three unit sheets have the same structure. Each unit sheet includes a connecting sheet and a reflecting sheet. The connecting sheet is connected to the reflecting sheet, and the reflecting sheet is triangular in shape. The reflecting sheet of any one unit sheet is connected to the reflecting sheets of the other two unit sheets, and the reflecting sheets of the three unit sheets form a triangular pyramid. The connecting piece is used to selectively connect to any one of the three connecting pieces of another calibration module; The method for manufacturing the unit sheet includes: Take a square plate with a side length of a, and the vertices of the four right angles of the square plate are A, B, C and D respectively; Take a point E on the side BC and a point F on the side CD so that the lengths of CE and CF are equal, both L, and L is greater than 0 and less than or equal to ; Cut the triangle CEF along the line connecting point E and point F, the triangle ABD is the reflector, and the isosceles trapezoid EFDB is the connecting piece; Bend along the line connecting point B and point D, the dihedral angle between plane ABD and plane EFDB is .

2. The method for manufacturing a calibration module according to claim 1, wherein: Any two of the three reflecting sheets are perpendicular to each other.

3. The method for manufacturing a calibration module according to claim 1, wherein: The reflective sheets are in the shape of an isosceles right triangle, the vertex angles of the three reflective sheets coincide, and in any two adjacent reflective sheets, the right-angled side of one reflective sheet is connected to the right-angled side of the other reflective sheet.

4. The method for manufacturing a calibration module according to claim 1, wherein: The three reflective sheets are all used to form a preset angle with the horizontal plane, and the three connecting sheets are all used to be perpendicular to the horizontal plane.

5. The method for manufacturing a calibration module according to claim 1, wherein: The method for manufacturing the unit sheet includes: Take a rectangular plate with a width of a and a length of b. The four right-angled vertices of the rectangular plate are A, B, C and D, respectively. The lengths of the AB and CD sides are b, the lengths of the BC and DA sides are a, and a and b satisfy ; Take a point E on the side AB, so that the length of AE is a, and take a point F on the side CD, so that the length of CF is a. Cut from point E along the line connecting point E and point D to point E1, and from point F along the line connecting point F and point B to point F1. The lengths of EE1 and FF1 are equal and both are less than Cutting along the line connecting point E1 and point F1 to obtain two unit sheets of the same shape and size, the two unit sheets are a hexagon AEE1F1FD and a hexagon CFF1E1EB, in which the triangle ADE is the reflector and the quadrilateral DE1F1F is the connecting sheet, and in the hexagon CFF1E1EB, the triangle CBF is the reflector and the quadrilateral BF1E1E is the connecting sheet; Bend along the line connecting point D and point E, the dihedral angle between plane ADE and plane DE1F1F is ; Bend along the line connecting point B and point F, the dihedral angle between plane CBF and plane BF1E1E is .

6. The method for manufacturing a calibration module according to claim 1, wherein: The reflective sheet is provided with a microwave reflective layer and an optical reflective layer. The optical reflective layer is provided on the microwave reflective layer. The microwave reflective layer is used to reflect microwaves emitted by the radar, and the optical reflective layer is used to reflect light toward the optical imaging device.

7. The method for manufacturing a calibration module according to claim 6, wherein: The microwave reflecting layer has a first calibration surface, and the optical reflecting layer has a second calibration surface. The first calibration surface is divided into a plurality of first calibration areas, and the second calibration surface is divided into a plurality of second calibration areas. At least two of the first calibration areas have different standard values ​​of microwave reflection characteristics; and at least two of the second calibration areas have different standard values ​​of optical reflection spatial distribution characteristics.

8. The method for manufacturing a calibration module according to claim 7, wherein: The microwave reflecting layer is provided with a plurality of grooves, and the side walls of the plurality of grooves jointly form the first calibration surface.

9. A method for manufacturing a splicing calibration device, characterized in that: The splicing calibration device comprises: a plurality of calibration modules manufactured by the manufacturing method according to any one of claims 1 to 8; Among any two adjacent calibration modules, the connecting piece of one calibration module is connected to the connecting piece of the other calibration module.

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