CN113069100B - Three-dimensional boundary measurement structure and method for rotatable electrical impedance tomography - Google Patents
Three-dimensional boundary measurement structure and method for rotatable electrical impedance tomography Download PDFInfo
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- 238000002593 electrical impedance tomography Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000712 assembly Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 6
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- 238000012360 testing method Methods 0.000 description 2
- 230000037237 body shape Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0536—Impedance imaging, e.g. by tomography
Abstract
The invention discloses a three-dimensional boundary measuring structure and a three-dimensional boundary measuring method for rotatable electrical impedance tomography, wherein a plurality of pairs of semicircles form a detachable laminated rotatable circular device and a measuring structure is formed by cooperation of a plurality of sensors, the analog quantity of the relative rotation change of an upper laminated layer and a lower laminated layer and the analog quantity of the length change of a telescopic rod are respectively measured and read, and the real rotation position and the length quantity of the telescopic rod are calculated according to a linear relation; then calculating the coordinates of the electrode by establishing a three-dimensional rectangular coordinate system method; and finally, calculating the outline of the more accurate three-dimensional human body measurement object through electrode coordinates, and improving the accuracy of reconstructing the outline by adjusting the relative positions of the laminated electrodes, thereby greatly improving the quality of image reconstruction.
Description
Technical Field
The invention relates to the technical field of three-dimensional electrical impedance tomography, in particular to a three-dimensional boundary measurement structure and method for rotatable electrical impedance tomography.
Background
Modern medical imaging is a very important component in medical diagnosis, is very accurate and intuitive in medical pathological diagnosis, and is increasingly widely applied clinically with the development of technology. According to researches, different tissues of organisms have different impedances, safe and regular current excitation is applied to a region to be detected through an electrode plate arranged on the surface of the region to be detected of a human body, and potential change can be caused on the surface of the region to be detected due to impedance change inside the region to be detected. Based on the change of the surface potential of the region to be detected, an image of the impedance change of the region to be detected can be obtained by assisting with a corresponding imaging algorithm, and the technology is called an electrical impedance tomography (Electrical ImpedaNce Tomography, EIT) technology. The electrical impedance tomography products are applied in clinic, and have two-dimensional imaging and three-dimensional imaging, but the defects of the products are needed to be noted, the accuracy of a three-dimensional imaging field model and the position coordinates of electrodes can have great influence on the image reconstruction quality, such as large position deviation of a reconstructed image and the actually measured human tissue and artifact of the reconstructed image.
The prior solution is to directly equivalent a field into a circular model, obtain a reconstructed model by learning a human body model, and build a field model and a concentric circle measuring structure with variable fixed electrode angles by taking a CT image as prior information. However, the equivalent model has great difference due to the variability of the body shape of the human body and the difference of the placement position of each electrode plate; the effect of the different electrode placement positions corresponding to the imaging using the algorithm in the three-dimensional electrical impedance imaging is different, and at present, no report on a three-dimensional electrical impedance boundary measuring structure capable of relatively rotating between layers (two layers of electrodes can relatively move) is known.
Disclosure of Invention
The invention aims to provide a three-dimensional boundary measurement structure and a three-dimensional boundary measurement method for rotatable electrical impedance tomography, which can improve the accuracy of reconstructing a contour by adjusting the relative positions of laminated electrodes, thereby greatly improving the quality of image reconstruction.
To achieve the above object, in a first aspect, the present invention provides a three-dimensional boundary measurement method of rotatable electrical impedance tomography, comprising the steps of:
constructing a ring laminated measurement structure based on a multi-layer semicircular assembly, and connecting the ring laminated measurement structure with a measured object to obtain the rotation quantity and the variation quantity corresponding to the motor and the telescopic rod;
establishing a three-dimensional space rectangular coordinate system based on the circle center of the semicircular assembly, and calculating the initial coordinates and electrode coordinates of each layer of semicircular assembly;
and calculating a corresponding difference coordinate by using an interpolation method according to the electrode coordinate, constructing a concentric equal-height unit cylinder, amplifying selected points on the equal-height unit cylinder according to the electrode coordinate and the difference coordinate, and connecting to obtain the three-dimensional contour.
The method for measuring the rotation quantity and the variation quantity of the motor and the telescopic rod based on the multilayer semicircular assembly comprises the following steps:
correspondingly installing telescopic rods in a plurality of installing holes in the semicircular ring, installing electrodes on one side of the telescopic rods facing to the circle center, and clamping the two semicircular ring assemblies through connecting buckles to obtain a circular ring layer;
any two annular layers are connected through corresponding bulges and connecting grooves, and angle adjustment is carried out through the rotating teeth, so that an annular laminated measuring structure is obtained;
and connecting the ring laminated measuring structure with a measured object to obtain the rotation quantity and the variation quantity corresponding to the motor and the telescopic rod.
The method for calculating the initial coordinates and the electrode coordinates of each layer of the semicircular assembly comprises the following steps of:
based on the axis of the circular ring laminated measuring structure, taking a first circular ring layer as a plane with a Z axis of zero in a rectangular coordinate system according to the sequence from bottom to top to obtain a corresponding three-dimensional space rectangular coordinate system;
and calculating the electrode initial coordinates of each ring layer based on the three-dimensional rectangular coordinate system, and calculating the electrode coordinates after corresponding measurement change by combining the acquired relative angles of each layer of electrode and the first layer of electrode rotating in the three-dimensional rectangular coordinate system of the top view.
Calculating a corresponding difference coordinate by using an interpolation method according to the electrode coordinate, constructing a concentric equal-height unit cylinder, amplifying points selected on the equal-height unit cylinder according to the electrode coordinate and the difference coordinate, and connecting to obtain a three-dimensional contour, wherein the method comprises the following steps:
rotating the annular layers of two adjacent layers, and calculating a difference coordinate corresponding to an interpolation point and a layer formed by the corresponding interpolation point by using an interpolation method;
constructing concentric equal-height unit cylinders, selecting enough points on the equal-height unit cylinders, amplifying the points selected on the concentric equal-height unit cylinders according to the electrode coordinates and the difference coordinates, and connecting all the points amplified to the boundary by utilizing straight lines to obtain corresponding three-dimensional contours.
In a second aspect, the present invention provides a three-dimensional boundary measurement structure for rotatable electrical impedance tomography, which is suitable for the three-dimensional boundary measurement method for rotatable electrical impedance tomography according to the first aspect, wherein the three-dimensional boundary measurement structure for rotatable electrical impedance tomography comprises a plurality of annular layers, a plurality of annular layers are arrayed along an axis, each annular layer comprises two semicircular assemblies, a plurality of telescopic rods, rotating teeth and electrodes, and each semicircular assembly is provided with a connecting buckle, a connecting clamping seat, a protrusion, a connecting groove and a plurality of mounting holes;
the mounting holes penetrate through the semicircular assembly and are fixedly connected with the sliding varistors on the telescopic rod, the telescopic rod is mounted, and the telescopic rod points to the circle center;
the connecting buckle is clamped with the connecting clamping seat of the other semicircular assembly;
the connecting clamping seat is clamped with the connecting clamping buckle of the other semicircular assembly;
the protrusions are clamped with the connecting grooves of the upper annular layer;
the connecting groove is clamped with the protrusion of the next annular layer;
the telescopic rods are connected with the semicircular ring assembly in a sliding manner and are arranged in the mounting holes;
the rotating teeth are fixedly connected with one side of the semicircular annular component, which is away from the circle center;
the electrodes are fixedly connected with one sides of the telescopic rods, which face the circle center, respectively.
The three-dimensional boundary measuring structure of the rotatable electrical impedance tomography also comprises a plurality of motors and a plurality of sensors, wherein the motors are clamped with one side of the back of the rotating teeth away from the circle center, and the sensors are fixedly connected with the motors.
The invention relates to a three-dimensional boundary measuring structure and a method for rotatable electrical impedance tomography, which are characterized in that a plurality of semi-circles form a detachable laminated rotatable circular device and a measuring structure in a cooperative manner by a plurality of sensors, the analog quantity of the relative rotation change of an upper laminated layer and a lower laminated layer and the analog quantity of the length change of a telescopic rod are respectively measured and read, and the real rotation position and the length quantity of the telescopic rod are calculated according to a linear relation; then calculating the coordinates of the electrode by establishing a three-dimensional rectangular coordinate system method; and finally, calculating the outline of the more accurate three-dimensional human body measurement object through electrode coordinates, and improving the accuracy of reconstructing the outline by adjusting the relative positions of the laminated electrodes, thereby greatly improving the quality of image reconstruction.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic step diagram of a three-dimensional boundary measurement method of rotatable electrical impedance tomography.
Fig. 2 is a schematic flow chart of a three-dimensional boundary measurement method of rotatable electrical impedance tomography.
Fig. 3 is a flow chart of three-dimensional contour reconstruction provided by the present invention.
Fig. 4 is a diagram of a semicircular ring structure provided by the present invention.
Fig. 5 is a diagram of a detachable ring structure according to the present invention.
FIG. 6 is a rotatable ring stack measurement configuration provided by the present invention.
Fig. 7 is a two-dimensional rectangular graph of eight electrodes of each layer without dislocation.
Fig. 8 is a reconstructed human chest three-dimensional contour model measured from a structure provided by the present invention.
FIG. 9 is a cross-sectional model of a cross-section measured without dislocation for each layer of eight electrodes provided by the present invention.
FIG. 10 is a cross-sectional model of a certain cross-section calculated by the two-layer eight-electrode equal difference dislocation provided by the invention.
The device comprises a 1-circular ring layer, a 2-semicircular assembly, a 3-telescopic rod, 4-rotating teeth, 5-electrodes, 6-connecting buckles, 7-connecting clamping seats, 8-protrusions, 9-connecting grooves, 10-mounting holes, 11-motors and 12-sensors.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 10, the present invention provides a three-dimensional boundary measurement method for rotatable electrical impedance tomography, comprising the following steps:
s101, constructing a ring laminated measurement structure based on the multi-layer semicircular assembly 2, and connecting the ring laminated measurement structure with a measured object to obtain the corresponding rotation quantity and change quantity of the motor 11 and the telescopic rod 3.
Specifically, the main structure mainly comprises a plurality of layers of detachable relatively rotatable ring laminated measuring structures formed by installing a plurality of semicircular structures, wherein the semicircular structures mainly comprise a mounting hole 10 of a telescopic rod 3, a connecting groove 9 connected with a lower layer, a bulge 8 structure connected with an upper layer, a motor 11 rotation measuring sensor 12, peripheral rotation teeth 4 and the like. Wherein the motor 11 rotates the measuring sensor 12 mainly for measuring the relative movement angle of the adjacent two layers. The telescopic rod 3 is installed in the telescopic rod 3 installation hole 10 of the main body structure, the telescopic rod 3 is used for installing the electrode 5 towards one position of the circle center, the telescopic rod 3 is in the state of maximum shrinkage during initialization and is fastened with the main body structure, and the telescopic rod 3 is released during measurement of a measurement object. Two semicircle ring-shaped components 2 are clamped through a connecting buckle 6 and a connecting clamping seat 7 to form a ring layer 1, a plurality of ring layers 1 are arrayed based on the axis of the ring layer 1, and the ring laminated measuring structure is obtained through clamping between the protrusions 8 and the connecting grooves 9.
Based on the test requirement, the ring laminated measuring structure is installed on the measured object, then, the motor 11 is started, the relative position between the layers of the electrode 5 is adjusted through the rotating teeth 4, then, the telescopic rod 3 is released to be in contact with the measured object, and the telescopic quantity of the telescopic rod 3 and the rotation quantity of the motors 11 of each layer are collected through the corresponding sensors 12.
S102, establishing a three-dimensional space rectangular coordinate system based on the circle center of the semicircular annular component 2, and calculating the initial coordinates and the electrode 5 coordinates of each layer of semicircular annular component 2.
Specifically, the circular ring laminated measuring structure can form an m-layer rotatable circular ring measuring structure by m pairs of semicircular assemblies 2 with the radius r, and the reconstruction boundary contour precision of a measuring field is higher when the number of the semicircular assemblies 2 is more and the distance between the layers is smaller; the number of the telescopic rods 3 is n, the angles formed by the adjacent telescopic rods 3 are equal, the height between layers is h, the distance from the telescopic rods 3 to the circular ring when the telescopic rods 3 are telescopic to the minimum is l, and the thickness of the electrode 5 is e. In order to facilitate calculation and establishment of a three-dimensional space rectangular coordinate system, the plane enclosed by the first layer of electrodes 5 is a plane with zero z axis, and the following information can be calculated according to the rectangular coordinate system established above:
θ is the angle between adjacent nodes (e.g., 1 in FIG. 7 1 To 2 1 Angle of (2)
i is the electrode 5 node mark in rectangular coordinate system, theta i Is the angle (theta) corresponding to the i electrode 5 node i ∈(0,2π)，i∈(1,n))
x i ＝(r-l-e)·cos(θ i ) (1-3)
y i ＝(r-l-e)·sin(θ i ) (1-4)
x i To the abscissa of the i electrode 5 node at initialization, y i For the ordinate of node 5 of the i-electrode at initialization
The initial coordinates of the first layer are (x i ，y i 0) Using the above calculation method, the initial coordinates (x) of the m-layer are obtained i ，y i ，(m-1)·h)
The coordinates of the electrode 5 at the time of measurement are calculated from the acquired information. After the structure is arranged on a measured object, the motor 11 is regulated to rotate to enable the electrode 5 to reach a desired position, the telescopic rod 3 is released to be clung to the skin of a human body after the regulation, and the relative angle beta of the rotation of each layer of electrode 5 and the first layer of electrode 5 in a rectangular coordinate system of a top view is read m (m is the number of layers, beta m E (0, θ)) and a shortening length l measured by the measurable distance sensor 12 in the telescoping device corresponding to each layer of inodes mi (m is the number of layers, i is the number of node marks), and the calculation formula of the electrode 5 coordinates is as follows:
θ mi ＝θ i +β m (1-5)
x mi ＝(r-l-e-l mi )·cos(θ mi ) (1-6)
y mi ＝(r-l-e-l mi )·sin(θ mi ) (1-7)
θ mi is the angle formed by the ith node of the mth layer and the positive direction of the x axis in a two-dimensional rectangular coordinate system, x mi Is the abscissa of the ith electrode 5 node of the mth layer, y mi Is the ordinate of the ith electrode 5 node of the mth layer, so the coordinate of the ith electrode 5 node of the mth layer is (x) mi ，y mi ，(m-1)·h)。
And S103, calculating a corresponding difference coordinate by using an interpolation method according to the electrode coordinate, constructing concentric equal-height unit cylinders, amplifying selected points on the equal-height unit cylinders according to the electrode coordinate and the difference coordinate, and connecting the points to obtain the three-dimensional contour.
Specifically, the human body contour is reconstructed. From the standpoint of reconstructing the contour precision, the contour precision reconstructed by forming a certain dislocation angle between the layers of electrodes 5 is higher, and as can be seen from fig. 9 and 10, the contour reconstructed by measuring the structure of two layers of 16 electrodes 5 without dislocation of the electrodes 5 is higher than the contour reconstructed by measuring the structure of two layers of 16 electrodes 5 without dislocation of the electrodes 5. According to the construction condition of the human body, particularly when the change of the cross section radius of the chest in the vertical direction is small, the coordinate corresponding to the electrode 5 of the layer can be obtained according to the electrode 5 coordinate of the error of the other layer by using a linear fitting or curve fitting method, and then the human body contour is obtained by connecting the nodes of the upper layer and the lower layer, so that the precision of reconstructing the contour is improved by the staggered lamination mode, and more choices are provided for the placement mode of the electrode 5. The main flow of reconstruction is shown in fig. 3.
The following description will be given of a two-layer structure in which the electrode 5 of the upper layer is rotated to the intermediate position between the two electrodes 5 of the lower layer, and the coordinates of the electrodes 5 of the upper and lower layers at this time are respectively (x) 1i ，y 1i H) and (x) 1i ，y 1i ，0)
(x 1ci ，y 1ci ，h c ) And (x) 2ci ，y 2ci ，h c ) The heights of the electrode 5 points of the first layer and the second layer are respectively h through linear interpolation c Boundary coordinates of (because the lower cross-sectional area of the chest of the human body is smaller than the high profile).
θ j ＝atan2(y j ，x j ) (1-12)
g j ＝(2n·k j +2n)％2n+1 (1-14)
g zj ＝[g j ] Rounding up (1-15)
t1 j ＝(g j +1)-g zj (1-16)
t2 j ＝g zj -g j (1-17)
v j ＝t1 j ·r g +t2 j ·r (g+1) (1-18)
X j ＝x j ·v j (1-19)
Y j ＝y j ·v j (1-20)
(x j ，y j ，h c ) To be at a height of h c The j-th point selected on the unit circle cross-section boundary, the j numbers are numbered from the intersection with the positive axis of the x-axis and in a counterclockwise order, θ j Four-quadrant reverse tangent angle (θ j ∈(-π,π))，k j For theta j The proportion of g in the circle j G is to divide the circle into 2n parts corresponding to the position zj To round g, t1 j T2 is the distance from the current position to the next integer j V is the distance between the current position and the current integer j Magnification of jth discrete node, (X) j ，Y j ，h c ) The j-th point selected on the unit circle cross section for the m layers is the actual finite element model node coordinate obtained according to the boundary condition, the point coordinate on the boundary is obtained through calculation, and the m cross section boundaries can be obtained by connecting the adjacent points through straight lines.
Referring to fig. 4 to 10, the present invention provides a three-dimensional boundary measurement structure of rotatable electrical impedance tomography, which is suitable for a three-dimensional boundary measurement method of rotatable electrical impedance tomography according to the first aspect, wherein the three-dimensional boundary measurement structure of rotatable electrical impedance tomography comprises a plurality of annular layers 1, a plurality of annular layers 1 are arrayed along an axis, each annular layer 1 comprises two semicircular assemblies 2, a plurality of telescopic rods 3, rotating teeth 4 and electrodes 5, and each semicircular assembly 2 is provided with a connecting buckle 6, a connecting clamping seat 7, a protrusion 8, a connecting groove 9 and a plurality of mounting holes 10;
the plurality of mounting holes 10 penetrate through the semicircular assembly 2 and are fixedly connected with a sliding rheostat on the telescopic rod 3 to mount the telescopic rod 3, and the telescopic rod 3 points to the circle center;
the connecting buckle 6 is clamped with the connecting clamping seat 7 of the other semicircular assembly 2;
the connecting clamping seat 7 is clamped with the connecting clamping buckle 6 of the other semicircular assembly 2;
the bulge 8 is clamped with the connecting groove 9 of the upper annular layer 1;
the connecting groove 9 is clamped with the protrusion 8 of the next annular layer 1;
a plurality of telescopic rods 3 are slidably connected with the semicircular assembly 2 and are arranged in the mounting holes 10;
the rotating teeth 4 are fixedly connected with one side of the semicircular annular component 2, which is away from the circle center;
the electrodes 5 are fixedly connected with one sides of the telescopic rods 3 facing the circle center respectively;
the three-dimensional boundary measuring structure of the rotatable electrical impedance tomography also comprises a plurality of motors 11 and a plurality of sensors 12, wherein a plurality of motors 11 are clamped with one side, deviating from the circle center, of the rotating teeth 4, and a plurality of sensors 12 are fixedly connected with the motors 11.
In this embodiment, the main structure is mainly composed of a plurality of layers of detachable and relatively rotatable ring laminated measuring structures formed by installing a pair of semicircular structures, and the semicircular structures are mainly composed of a mounting hole 10 of a telescopic rod 3, a connecting groove 9 connected with a lower layer, a boss 8 structure connected with an upper layer, a motor 11 rotation measuring sensor 12, peripheral rotation teeth 4 and the like. Wherein the motor 11 rotates the measuring sensor 12 mainly for measuring the relative movement angle of the adjacent two layers. The telescopic rod 3 is installed in the telescopic rod 3 installation hole 10 of the main body structure, the telescopic rod 3 is used for installing the electrode 5 towards one position of the circle center, the telescopic rod 3 is in the state of maximum shrinkage during initialization and is fastened with the main body structure, and the telescopic rod 3 is released during measurement of a measurement object. Two semicircle ring-shaped components 2 are clamped through a connecting buckle 6 and a connecting clamping seat 7 to form a ring layer 1, a plurality of ring layers 1 are arrayed based on the axis of the ring layer 1, and the ring laminated measuring structure is obtained through clamping between the protrusions 8 and the connecting grooves 9.
Based on the test requirement, the ring laminated measuring structure is installed on the measured object, then, the motor 11 is started, the relative position between the layers of the electrode 5 is adjusted through the rotating teeth 4, then, the telescopic rod 3 is released to be in contact with the measured object, and the telescopic quantity of the telescopic rod 3 and the rotation quantity of the motors 11 of each layer are collected through the corresponding sensors 12. The specific definition of a three-dimensional boundary measurement structure for rotatable electrical impedance tomography may be referred to above as the definition of a three-dimensional boundary measurement method for rotatable electrical impedance tomography, and will not be described herein. Each module in the three-dimensional boundary measurement structure of rotatable electrical impedance tomography can be fully or partially implemented by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
The invention relates to a three-dimensional boundary measuring structure and a method of rotatable electrical impedance tomography, which use a detachable laminated rotatable round device formed by a plurality of semicircles and a measuring structure formed by a plurality of sensors 12 in a coordinated way, respectively measure and read the analog quantity of the relative rotation of an upper laminated layer and a lower laminated layer and the analog quantity of the length change of a telescopic rod 3, and calculate the real rotation position and the length quantity of the telescopic rod 3 according to the linear relation; then calculating the coordinates of the electrode 5 by establishing a three-dimensional rectangular coordinate system method; finally, the outline of the more accurate three-dimensional human body measurement object is obtained through the coordinate calculation of the electrode 5, and the accuracy of reconstructing the outline is improved through adjusting the relative position of the laminated electrode 5, so that the quality of image reconstruction is greatly improved.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (1)
1. The three-dimensional boundary measuring method for rotatable electrical impedance tomography is characterized by comprising the following steps of:
based on multilayer semicircle ring subassembly builds ring lamination measurement structure to with after ring lamination measurement structure is connected with the measured object, obtain the rotation quantity and the variation that motor and telescopic link correspond, include:
correspondingly installing telescopic rods in a plurality of installing holes in the semicircular ring, installing electrodes on one side of the telescopic rods facing to the circle center, and clamping the two semicircular ring assemblies through connecting buckles to obtain a circular ring layer;
any two annular layers are connected through corresponding bulges and connecting grooves, and angle adjustment is carried out through rotating teeth, so that an annular laminated measuring structure is obtained;
the ring laminated measuring structure comprises a plurality of ring layers, a plurality of ring layers are arrayed along an axis, each ring layer comprises two semicircular assemblies, a plurality of telescopic rods, rotating teeth, electrodes, a plurality of motors and a plurality of sensors, and each semicircular assembly is provided with a connecting buckle, a connecting clamping seat, a protrusion, a connecting groove and a plurality of mounting holes;
the mounting holes penetrate through the semicircular assembly and are fixedly connected with the sliding varistors on the telescopic rod, the telescopic rod is mounted, and the telescopic rod points to the circle center;
the connecting buckle is clamped with the connecting clamping seat of the other semicircular assembly;
the connecting clamping seat is clamped with the connecting clamping buckle of the other semicircular assembly;
the protrusions are clamped with the connecting grooves of the upper annular layer;
the connecting groove is clamped with the protrusion of the next annular layer;
the telescopic rods are connected with the semicircular ring assembly in a sliding manner and are arranged in the mounting holes;
the rotating teeth are fixedly connected with one side of the semicircular annular component, which is away from the circle center;
the electrodes are fixedly connected with one sides of the telescopic rods, which face the circle center, respectively;
the motors are clamped with one side of the rotary tooth back away from the circle center, and the sensors are fixedly connected with the motors;
connecting the ring laminated measuring structure with a measured object to obtain the rotation quantity and the variation quantity corresponding to the motor and the telescopic rod;
establishing a three-dimensional space rectangular coordinate system based on the circle center of the semicircular assembly, and calculating the electrode initial coordinates of each layer of semicircular assembly, wherein the method comprises the following steps:
based on the axis of the circular ring laminated measuring structure, taking a first circular ring layer as a plane with a Z axis of zero in a rectangular coordinate system according to the sequence from bottom to top to obtain a corresponding three-dimensional space rectangular coordinate system;
calculating the electrode initial coordinates of each ring layer based on the three-dimensional space rectangular coordinate system, and calculating the electrode coordinates after corresponding measurement changes by combining the obtained relative angles of each layer of electrodes and the first layer of electrodes rotating in the three-dimensional space rectangular coordinate system of the top view and the change amount of the telescopic rod;
calculating a corresponding difference coordinate by using an interpolation method according to the electrode coordinate, constructing a concentric equal-height unit cylinder, amplifying points selected on the equal-height unit cylinder according to the electrode coordinate and the difference coordinate, and connecting to obtain a three-dimensional contour, wherein the method comprises the following steps:
rotating the annular layers of two adjacent layers, and calculating a difference coordinate corresponding to an interpolation point and a layer formed by the corresponding interpolation point by using an interpolation method;
constructing concentric equal-height unit cylinders, selecting enough points on the equal-height unit cylinders, amplifying the points selected on the concentric equal-height unit cylinders according to the electrode coordinates and the difference coordinates, and connecting all the points amplified to the boundary by utilizing straight lines to obtain corresponding three-dimensional contours.
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| WO2015025113A1 (en) * | 2013-08-20 | 2015-02-26 | Khor Joo Moy | Apparatus and method for estimating shape |
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