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A method for high-speed photogrammetry of three-dimensional displacement

A high-speed photography and high-speed camera technology, applied in measuring devices, instruments, optical devices, etc., can solve problems such as inability to measure three-dimensional displacement, large depth of field error, and measurement equipment that cannot meet requirements

Active Publication Date: 2020-07-10
JIANGXI HONGDU AVIATION IND GRP
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  • Abstract
  • Description
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Problems solved by technology

Chinese patent ZL 201310675316.6 discloses a three-dimensional grating displacement measurement system that can measure vertical displacement. The limitation is that the grating is generally inconvenient to install
Existing measuring equipment cannot meet the requirements due to the violent movement and the severe impacts
A high-speed camera can measure three-dimensional displacement through multiple auxiliary measurement points, but it will cause a large depth of field error
If the component to be measured is relatively small and multiple auxiliary measurement points cannot be installed, then a high-speed camera cannot measure three-dimensional displacement

Method used

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  • A method for high-speed photogrammetry of three-dimensional displacement
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  • A method for high-speed photogrammetry of three-dimensional displacement

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Embodiment Construction

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the present invention will be further described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, and are only used to illustrate and explain the present invention. invention, not to limit the invention.

[0046] like figure 2 As shown, the rod rotates around point H, and point H moves up and down along the z-axis of the world coordinate system oxyz. Point P is a free point and a violent impact will occur during the movement, so the rod has 3 degrees of freedom , the displacement of P is a three-dimensional displacement. The coordinate system o'x'y'z' is a Cartesian coordinate system fixed at the optical center of the high-speed camera, and the point P' is the image point formed by the point P. Therefore the present invention provides a kind of method of h...

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Abstract

The invention discloses a method for measuring three-dimensional displacement by high-speed photography, comprises the following steps of measuring the vertical displacement of one end of a rod usinga wire displacement sensor, and capturing a mark at the other end of the rod using a high speed camera; listing a coupled equation between the physical quantities measured by the two devices by usingthe coupling relationship between the linear displacement sensor and the high-speed photography in measuring the rod; squaring and adding the two sides of the equation multiple times in the solution,eliminating a azimuth angle and a zenith angle in the three-dimensional motion of the rod, and transforming the coupling equation into a quadratic equation with only the unknown lambda (t); finally, transforming the three-dimensional displacement in the high-speed camera coordinates into a three-dimensional displacement in the world coordinate system by using the relationship between a world coordinate system and the high-speed camera coordinate system, and realizing the three-dimensional displacement measurement of the free end of the rod. The invention has the advantages that the data processing is simplified, the equipment installation is simple, the equipment is not affected by the impact during the measurement process, and the safety of the equipment is protected.

Description

technical field [0001] The invention relates to three-dimensional displacement measurement technology, in particular to a method for high-speed photogrammetry of three-dimensional displacement. Background technique [0002] Three-dimensional measurement technology is widely used in various fields such as industrial production, machining and manufacturing, tracking and positioning, and is a very important technology. Chinese patent ZL 201310675316.6 discloses a three-dimensional grating displacement measurement system capable of measuring vertical displacement. The limitation is that the grating is usually inconvenient to install. Chinese patent ZL 201510024111.0 discloses a method for measuring three-dimensional relative displacement with a wire displacement sensor. This method stretches the wires of three wire displacement sensors with known positions to the same measurement point, and then uses the determined length of the wires to determine the spatial position of the obj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 胡豪刘国祥孙福强黄怀英刘庆彬刘征熊俊涛刘群根朱利媛林海彬岳宝成万建平
Owner JIANGXI HONGDU AVIATION IND GRP
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