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Flexible calibration device for calibrating wind tunnel vision measurement system

A technology of visual measurement and calibration device, which is applied in the field of wind tunnel experiments, can solve the problems of low processing precision and low calibration calibration precision, and achieve the effect of simple structure, low processing precision and convenient disassembly

Active Publication Date: 2015-07-15
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and to invent a flexible calibration device for the calibration of wind tunnel vision measurement systems. The composite flexible target composed of the calibration plate assembly solves the problems of low calibration processing accuracy and low calibration calibration accuracy using the calibration plate

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  • Flexible calibration device for calibrating wind tunnel vision measurement system
  • Flexible calibration device for calibrating wind tunnel vision measurement system
  • Flexible calibration device for calibrating wind tunnel vision measurement system

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Embodiment 1

[0013] The vision system for model deformation measurement is calibrated by using the central calibration plate 1 of the present invention. When measuring the deformation of the model, the size of the wind tunnel model is 300mm×250mm, and the calibrated field of view is 300mm×250mm. The size of the field of view is moderate, considering the cost and processing difficulty comprehensively, the present invention uses the flexible target inner calibration plate 1 as the target to calibrate the visual measurement system, as shown in the attached Figure 4 As shown, the area size is 300mm×300mm. In order to improve the calibration accuracy and make the target cover the entire field of view, the flexible target calibration plate 1 and the circular flange plate 10 are fastened together by four hexagon socket bolts 9, and the calibration control point 8 is set on the calibration plate 1 during calibration. Flexible targets are placed in multiple positions in space. Using multiple tar...

Embodiment 2

[0017] The left calibration ruler 2, the right calibration ruler 3 and the calibration plate 1 of the present invention are combined and assembled to form a target to calibrate the vision system for model pose parameter measurement. During the measurement experiment of model pose parameters in the wind tunnel environment, the tested model flies freely in space, and the flight trajectory is approximately a straight line in space. Take model pictures in the camera measurement field of view to solve the model pose parameters. The camera measurement field of view is 1000mm×1000mm, and the object flight field of view is 1000mm×50mm. If only the calibration plate 1 is used for camera calibration, when the entire calibration plate 1 fills the entire measurement field of view, it is difficult to guarantee the flatness of the calibration plate 1 due to its large size; if only the upper calibration ruler 4, the lower calibration ruler 5, and the left calibration Calibrate the camera wi...

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Abstract

The invention discloses a flexible calibration device for calibrating a wind tunnel vision measurement system, belongs to the field of computer vision, and relates to a calibration device for calibrating a vision measurement system in a wind tunnel environment. The calibration device consists of a flexible target and a target position controller, wherein a groove is formed in each of four side surfaces of a calibration plate; two raised rectangular blocks are arranged on the side of each groove; the two rectangular blocks are arranged in a central symmetry manner relative to the side surface; and totally four calibration scales are arranged. In the target position controller, a circular flange plate is fixedly arranged on the calibration plate by virtue of four inside hexagonal bolts, namely a target motion controller and the flexible target are assembled and connected together. The flexible calibration device is low in cost, simple, convenient and easy to detach, and the problems that the large calibration plate is low in calibrating and machining precision, the adopted calibration cross rack is low in calibration and correction precision and the like are solved. During calibration, the target is arranged on a bracket, the target motion is controlled by adopting a ball bearing pair, and interference brought by handheld shake is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel experiments, and relates to a flexible calibration device used for calibration of a visual measurement system in a wind tunnel environment. Background technique [0002] In recent years, with the continuous development of aerospace technology, national defense technology has put forward higher and higher technical requirements for various aircraft. The wind tunnel experiment provides an important path for predicting the aerodynamic performance of the aircraft and obtaining the key aerodynamic data required by the aircraft. The environment in the wind tunnel is complex and the airflow is turbulent. It is difficult to measure the deformation, pose parameters, dynamic derivatives, and vibration of objects using conventional measurement methods. Visual measurement technology has shown obvious technical advantages in wind tunnel experiments with the characteristics of dynamic measurement, strong r...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 刘巍李肖贾振元陈玲马鑫刘惟肖
Owner DALIAN UNIV OF TECH
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