CN214583087U

CN214583087U - Array type three-dimensional scanning system target

Info

Publication number: CN214583087U
Application number: CN202120672575.3U
Authority: CN
Inventors: 翟杭军; 王凌; 王斌锐; 吴晓亮; 陈锡爱; 高雁凤
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-11-02
Anticipated expiration: 2031-04-01

Abstract

The utility model relates to an array three-dimensional scanning system mark target, the device include target ball array, fixed frame, bracing piece. The target ball array is formed by connecting a plurality of target balls through connecting rods, and holes are drilled at the bottoms of the target balls at four corner positions of the target ball array for fixing the target ball array. The fixed frame is used for fixing and positioning the target ball plane, a plurality of positioning holes are formed in four edges, and the positioning pins are fixed through the positioning holes, so that the target ball array heights of various types can be adjusted. The supporting rod is used for supporting the target ball array, and the four raised positioning pins at the top of the supporting rod are used for fixing the target ball array. The array type three-dimensional scanning system target device can be used for performance evaluation of three-dimensional scanning systems such as structured light systems and the like, and has the advantages of low cost, simplicity in operation and convenience in installation.

Description

Array type three-dimensional scanning system target

Technical Field

The patent of the utility model relates to an array three-dimensional scanning system mark target relates to optics three-dimensional measurement field.

Background

With the improvement of the scientific level of human beings and the development of modern information technology, the three-dimensional data of the object morphology is more and more widely applied in the fields of virtual reality, reverse engineering, cultural relic research, medical imaging, aerospace and the like. However, the research results of the performance evaluation method of the three-dimensional scanning system are still few, only the international VDI/VDE 2634 and ISO 10360 series standards exist, and no evaluation standard for the optical three-dimensional measurement system exists in China. In the VDI/VDE 2634 standard, the 3D scan calibrator specifies the use of a bat with two target balls, the dimensions of which are calibrated in advance, to perform error analysis and performance evaluation work of the 3D scanner. In this standard, seven arbitrary positions of the target bat are sampled in the measurement volume by an optical three-dimensional measurement system, and the measurement positions are distributed as uniformly as possible in the whole measurement volume, and the characteristic quantity of the sampling comprises the center distance of the target balls at two ends of the bat, which can be used for verifying the length measurement capability of the three-dimensional measurement system. The 3D calibrator only has target balls at two ends, so that the distance between single balls can be measured during sampling every time, and the problems of small sample capacity and large measurement workload are caused.

Furthermore, the international standard ISO 10360 also specifies a performance evaluation acceptance method for optical three-dimensional measurement systems, wherein it is also recommended to use a calibrated bat and to place it in seven different poses, each with five different calibration test lengths, each length being measured three times for a total of 105 measurements, wherein four of these poses are space diagonals. In the standard, by increasing multiple center distances and repeating measurement methods, the problem of small volume of collected samples during measurement is solved, but the work flow of acceptance is still complicated.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve not enough and the defect in the current standard, provide an easy operation convenience, acquire the enough big array three-dimensional scanning system mark target of sample capacity. When the target changes different heights, the three-dimensional scanning system can obtain a large amount of characteristic quantities from the point cloud of the target through scanning, so that the performance evaluation acceptance flow of the optical three-dimensional coordinate measuring system is greatly simplified.

In order to achieve the above purpose, the utility model discloses technical scheme as follows: the array type three-dimensional scanning system target comprises a target ball array, a fixed frame and supporting rods, wherein the target balls are precision alumina ceramic balls with the diameter of 20mm and are arranged into an nxn array through connecting rods, and holes are drilled at the bottoms of four target balls. The fixed frame comprises a pair of chute channels located at the upper position and the lower position, the tail part is provided with a base, nine groups of positioning holes are punched on four edges, and the fixed frame is matched with four positioning pins in sequence to be used, so that the heights of multiple differences can be adjusted, the supporting rod comprises a pair of chute channels located at the upper position and the lower position, four fixing shafts are punched on the top part, and four positioning holes are punched on the tail part.

The utility model discloses concrete theory of operation is: the four fixed shafts of the supporting rod are in butt joint with the target balls at the four drill holes, the target ball array is fixed at the top of the supporting rod, the supporting rod enters the fixed frame along the chute track, the positioning pins penetrate into the fixed frame and the positioning holes in the supporting rod to fix the fixed frame and the supporting rod, and therefore the target ball array is also fixed. The position of the positioning hole through which the positioning pin penetrates is changed, so that the three-dimensional scanning instrument can scan target ball arrays at different heights, and finally, the position or shape analysis is carried out on the radius and the center distance of all target balls in the space, and the performance evaluation of various three-dimensional scanning instruments is obtained.

Array three-dimensional scanning system target, its beneficial effect is: the invention also considers the problem of small sample capacity when the optical three-dimensional measurement system samples, greatly simplifies the acceptance flow and has simple operation. Compared with a 3D calibration bat in a standard test method, the target provided by the invention can obtain various ball distances during scanning, the workload in an acceptance process is greatly reduced, and meanwhile, the target also meets the requirement of being used as a measuring object in the standard test method.

Drawings

Fig. 1 shows a target ball array, 1 is a connecting rod, 2 is a drilling target ball, and 3 is a target ball.

Fig. 2 shows a fixed frame, 4 is an outer sliding groove track, 5 is an outer positioning hole, and 6 is a base.

Fig. 3 shows a support rod, 7 shows a positioning pin, 8 shows an inner positioning hole, 9 shows an inner chute track, and 10 shows a fixed shaft.

Detailed Description

In fig. 1, the target ball array is composed of nxn target balls 3 which are connected by a connecting rod 1, and drilled target balls 2 are formed by drilling at the bottoms of the target balls at four corner positions, wherein the target balls are precision alumina ceramic balls with the diameter of 20mm, and the target balls are enclosed into a 6x6 array by the connecting rod, and the device is used for measuring and calculating characteristic quantities of the target balls, including radius and center distance, by a structured light system.

In fig. 2, the support rod is provided with a fixing shaft 10, after the drilling target balls are embedded, the position of the target ball array can be fixed, and the base 6 is used for supporting the whole system device.

In fig. 3, the positioning pin 7 can be inserted into the outer positioning hole 5 of the fixing frame and the inner positioning hole 8 of the supporting rod to fix the fixing frame and the supporting rod together and keep the relative positions stable. The supporting rod can be fixed at any position in the fixed frame by utilizing the sliding groove tracks on the fixed frame and the supporting rod and changing the position of the outer positioning hole through which the positioning pin penetrates.

The target ball array is positioned outside the fixed frame, so that the three-dimensional scanning instrument can scan the target ball arrays at different heights, and the performance evaluation of various three-dimensional scanning instruments is obtained by performing instrument performance analysis on the radiuses and the center distances of all target balls in the space.

Claims

1. An array type three-dimensional scanning system target is characterized in that: the target ball array comprises a plurality of target balls on the same plane, holes are drilled at the bottoms of four target balls, the fixed frame comprises a base, an outer chute track and a positioning hole, and the support rod comprises four positioning pins, a pair of inner chute tracks and four fixed shafts; the four fixed shafts of the supporting rod are in butt joint with the target balls at the four drill holes, the target ball arrays are fixed at the top of the supporting rod and exposed outside the fixed frame, the supporting rod enters the fixed frame along the sliding groove track, and the positioning pins penetrate into the positioning holes in the fixed frame and the supporting rod to fix the fixed frame and the supporting rod.

2. The array three-dimensional scanning system target of claim 1, wherein: the target balls are precision alumina ceramic balls with a diameter of 10mm to 100mm and are arranged in an nxn array by connecting rods, wherein four target balls are drilled at the bottom.

3. The array three-dimensional scanning system target of claim 1, wherein: the supporting rod comprises a pair of inner sliding groove channels which are located at the upper position and the lower position, the top of the supporting rod is provided with four fixing shafts, and the tail of the supporting rod is provided with four positioning holes.

4. The array three-dimensional scanning system target of claim 1, wherein: the fixed frame comprises a pair of outer sliding groove channels which are positioned at the upper position and the lower position, the tail part of the fixed frame is provided with a base, and nine groups of positioning holes are formed in four edges and are sequentially matched with four positioning pins for use.