Standard ball rod for measuring error calibration of phase type laser radar measuring system

Abstract

The utility model provides a standard ball rod for measuring error calibration of a phase type laser radar measuring system. The standard ball rod comprises two standard balls and a connecting rod, the two standard balls are fixedly connected to the two ends of the connecting rod; the length of the distance between the ball centers is 1-1.5 m, the diameter of the two standard balls is 100-150 mm, and the sphericity of the two standard balls is 2-5 microns. According to the standard ball rod for calibrating the measuring error of the phase type laser radar measuring system, the measuring error of the phase type laser radar measuring system can be accurately calibrated. According to the measurement method, a series of problems such as feeding the phase type laser radar into a laboratory or moving laboratory equipment into a plant are avoided, and the method has the characteristics of simplicity in operation, high universality, high measurement accuracy and reliability in work.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of standard appliance for surveying instrument calibration, especially relates to a standard ball rod for calibrating the measurement error of a phase laser radar measurement system. BACKGROUND

[0002] (1) Term explanation

[0003] Phase laser radar: a kind of principle of phase laser ranging, the frequency of radio wave band is used to modulate the amplitude of laser beam and determine the phase delay generated by modulated light to and fro measuring line once, and then the distance represented by this phase delay is converted according to the wavelength of modulated light. By recording the three-dimensional coordinates, reflectivity and texture information of a large number of dense points on the surface of the measured object, the three-dimensional model of the measured target and various 3D data such as line, surface and body can be quickly reconstructed.

[0004] Standard ball rod: a kind of physical standard composed of A and B two standard balls and connecting rod, the diameters of A and B two standard balls and the distance between the centers of the two standard balls can be obtained by measurement. Figure 1

[0005] Phase laser radar system: a complete measurement system taking phase laser radar as the main measuring component, containing algorithm software, positioning target and fixed support. (2) Technical background

[0007] Phase laser radar is usually used to measure the appearance of large structural parts, such as rocket cabin, ship curved plate, etc. The measurement includes external dimensions and part of form error, such as flatness, roundness, perpendicularity, etc.

[0008] Phase laser radar is usually installed in the factory as the main component of a large measurement system. As part of the measurement system, if the phase laser radar is removed and sent to the laboratory for measurement, there are two problems. The first is that only the phase laser radar is measured without measuring the system, and the algorithm and target position will affect the error of the system. The second is that the disassembly of phase laser radar will cause installation error, which will cause deviation of the coordinate origin and coordinate system of the equipment, thus affecting the measurement result.

[0009] Therefore, a method for calibrating the measurement error of phase laser radar system on site in the factory is needed.

[0010] Therefore, a standard ball rod for calibrating the measurement error of phase laser radar system on site in the factory is designed. The standard ball rod has the advantages of simple installation, strong universality, high measurement accuracy, high measurement stability, etc., and has obvious practicality and economic benefit. ​The utility model discloses a content

[0011] The utility model discloses a kind of standard ball poles for phase laser radar measurement system measurement error calibration, since the calibration of phase laser radar measurement system is carried out in factory building, therefore the utility model mainly solves the factor of affecting standard ball pole error.

[0012] Main influencing factors are:

[0013] (1) since phase laser radar measurement system usually measures large components, the ball center distance size of standard ball pole cannot be less than or equal to 1m.

[0014] (2) due to the measurement principle of phase laser radar, the curvature radius of two standard balls cannot be too small, and its diameter is less than or equal to <100mm.

[0015] (3) from the technical specification of phase laser radar, the surface reflectivity of measured object will affect measurement error, so the surface reflectivity of two standard balls is ≥90%

[0016] (4) when the ball center distance of standard ball pole is greater than or equal to 1m, the deformation influence caused by gravity is eliminated.

[0017] (5) temperature: the temperature of factory building is usually (20±10) ℃, and temperature changes greatly with time and space gradient.

[0018] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0019] (1) the ball center distance length of standard ball pole (1-1.5) m, too long ball center distance makes transportation and carrying extremely inconvenient.

[0020] (2) the diameter of two standard balls (100-150) mm, and the sphericity of two standard balls (2-5) μm.

[0021] (3) the surface of two standard balls adopts sand blasting process, so that the surface presents gray matt.

[0022] (4) the connecting rod of two standard balls adopts pipe material with diameter (50-60) mm, wall thickness (4-6) mm, and installation fixing point is left at both ends of connecting rod, and the ball center distance of each installation fixing point from adjacent standard ball should be 2 / 9L (L is the ball center distance of two standard balls).

[0023] (5) the connecting rod of two standard balls adopts 4j36 invar steel, since the linear expansion coefficient of 4j36 invar steel is only 1.5×10-6 ℃-1, so that the ball center distance is less affected by temperature change.

[0024] The standard ball rod for calibrating the measurement error of the phase laser radar measurement system can calibrate the measurement error of the phase laser radar measurement system accurately. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model makes further explanation in connection with the drawings:

[0026] Figure 1 It is standard ball rod schematic drawing;

[0027] Figure 2 It is standard ball rod's use schematic drawing. DETAILED DESCRIPTION

[0028] The utility model makes further detailed explanation in connection with the drawings and specific embodiment for the standard ball rod for calibrating the measurement error of the phase laser radar measurement system. According to the following explanation and claims, the advantages and characteristics of the utility model will be more clear. It is explained that, the drawings all adopt very simplified form and all use non-precise ratio, only to facilitate, clear and assist the purpose of explanation of the utility model embodiment.

[0029] The utility model adopts following technical scheme:

[0030] (1) standard ball rod ball center distance length (1-1.5) m, too long ball center distance makes transportation and carrying extremely inconvenient.

[0031] (2) the diameter of two standard balls (100-150) mm, the sphericity of two standard balls (2-5) μm.

[0032] (3) two standard ball surfaces adopt sand blasting process, so that the surface presents gray matt.

[0033] (4) the connecting rod of two standard balls adopts the pipe material with diameter (50-60) mm, wall thickness (4-6) mm, and there is installation fixed point at both ends of the connecting rod, and the ball center distance of each installation fixed point from adjacent standard ball should be 2 / 9L (L is the ball center distance of two standard balls).

[0034] The connecting rod of two standard balls adopts 4j36 invar steel, and since the linear expansion coefficient of 4j36 invar steel is only 1.5x10 -6 ℃ -1 , the ball center distance is less affected by temperature change.

[0035] EMBODIMENT

[0036] The specific implementation manner of the utility model is explained as follows in connection with the drawings:

[0037] See Figure 2 1 and 2 standard balls, 3 connecting rod, 4 support block, 5 tripod, 6 phase-type laser radar, 7 wall or ground.

[0038] The process of use:

[0039] The standard ball 1, standard ball 2, and connecting rod 3 together form the standard golf club.

[0040] Mount the standard golf club on support block 4, mount it on tripod 5, and place it on the ground 7.

[0041] The phase-detection lidar 6 is typically fixed in a specific location. Activating the phase-detection lidar 6 completes the measurement of a standard golf club. The measurement generates point cloud data α1(x). i ,y i ,z i ), and can obtain the distance L between the centers of the sphere. 球1 Cloud data α can be obtained through repeated measurements. j (x i ,y i ,z i ) and the distance from the center of the ball L 球j The measurement error is then δ. 球 =L 球j -L 球 (L) 球 (This refers to the standard value of the distance between the centers of the sphere).

[0042] The contents not described in detail in this specification are existing technology known to those skilled in the art. It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A standard ball-and-stick for calibrating measurement errors in a phase-type lidar measurement system, characterized in that, It includes two standard balls and a connecting rod; the two standard balls are fixedly connected to both ends of the connecting rod; The distance between the centers of the two standard spheres is 1 to 1.5 m, the diameter of the two standard spheres is 100 to 150 mm, and the sphericity of the two standard spheres is 2 to 5 μm.

2. The standard ball-shaped rod for calibrating measurement errors in a phase-type lidar measurement system as described in claim 1, characterized in that... The surfaces of the two standard spheres are sandblasted to give them a gray matte finish.

3. The standard ball-shaped rod for calibrating measurement errors in a phase-type lidar measurement system as described in claim 1, characterized in that... The connecting rod for the two standard balls is made of tubing with a diameter of 50-60mm and a wall thickness of 4-6mm. There are installation and fixing points at both ends of the connecting rod. The distance between each installation point and the center of the adjacent standard ball is 2 / 9L, where L is the distance between the centers of the two standard balls.

4. The standard ball-shaped rod for calibrating measurement errors in a phase-type lidar measurement system as described in claim 1, characterized in that... The connecting rod is made of 4J36 Invar steel.

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