A method and device for on-line measurement of three-dimensional shape of icing

A measurement method and shape technology, applied in measurement devices, optical devices, image analysis, etc., can solve the problems of low measurement accuracy, low reflectivity of bright ice, and diffusion of the laser band in the collected image, and achieve high measurement accuracy and image quality. Clear, high-contrast results

Active Publication Date: 2022-06-17
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Application Information

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Problems solved by technology

[0005] However, the reflectivity of clear ice is extremely low throughout the recorded spectral range, with less than 2% of the incident light being reflected at the object surface in the visible range
Due to the high transparency and smooth surface of clear ice, when the line laser is projected on the surface of the ice body, most of the light is projected on the ice body, and only a small part of the light is reflected by the surface of the ice body, resulting in serious diffusion of the laser band area in the collected image, which is manifested in the image as In a bright spot area, it is difficult for the camera to obtain a clear light stripe pattern, resulting in low measurement accuracy and the inability to accurately obtain ice-shaped structures

Method used

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  • A method and device for on-line measurement of three-dimensional shape of icing
  • A method and device for on-line measurement of three-dimensional shape of icing
  • A method and device for on-line measurement of three-dimensional shape of icing

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Experimental program
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Effect test

Embodiment 1

[0039] An on-line measurement method of icing three-dimensional shape, such as figure 1 and figure 2 shown, including the following steps:

[0040] S10. The line laser generator 13 starts scanning from the initial position i of the object surface to be measured, and the line laser generator projects a light plane to the object surface 11 to be measured, and intersects the surface of the object to be measured to generate a light bar G i ; Among them, i is any position on the surface of the object to be measured;

[0041] That is to say, the line laser generator can start scanning from any position on the surface of the object to be measured, and in the subsequent step S50, the line laser generator is rotated until the entire surface of the object to be measured is swept, and then the ice scanning of one section ends. ;

[0042] S20. Multispectral camera 12 simultaneous shooting light bar G i , forming a target for the light bar G iThe first to N images of reflected light ...

Embodiment 2

[0064] This embodiment provides a measurement device for completing the measurement method of Embodiment 1, such as Figure 4 shown, including a multispectral image acquisition system and a data processing system (not shown in the figure);

[0065] The multispectral image acquisition system includes a multispectral camera 12, a rotating table (not shown in the figure) and a line laser generator 13; the line laser generator is arranged on the rotating table; when in use, the multispectral camera 12 and the line laser generator 13 are arranged facing the object surface 11 to be measured; it is worth noting that there is no specific limitation on the positional relationship between the multispectral camera and the line laser generator, as long as the line laser generator and the multispectral camera are There is no mutual interference, and the line laser generator can project the laser to the surface of the object to be measured, and the multispectral camera can capture the light...

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Abstract

The invention is applicable to the technical field of ice shape measurement, and provides an online three-dimensional shape measurement method and measurement device for ice formation. The invention projects a line laser with a specific wavelength onto the surface of the ice, and the camera captures the spectral responses of multiple different bands. Modulate the laser pattern to obtain images under different bands of lasers reflected by the icing surface. After processing multiple images under different bands of lasers, the overexposed pixels in each image are removed, and the pixels at the corresponding positions in each image are retained. The pixel value with the largest pixel value in the unsaturated pixels is then fused with the remaining pixel values ​​to form the final icing surface image, which solves the problem that clear ice and mixed ice have extremely low reflectivity of visible light, and it is difficult for the camera to obtain clear light stripes pattern, leading to technical problems of low measurement accuracy. The icing ice shape image measured by the measuring device and measuring method of the invention has high contrast and high measurement accuracy, and can realize in-situ on-line measurement of icing three-dimensional growth.

Description

technical field [0001] The invention relates to the technical field of ice shape measurement, in particular to an on-line measurement method and measurement device for the three-dimensional shape of ice formation. Background technique [0002] The study found that the icing phenomenon during flight is one of the main reasons for the safety of aircraft flight. The icing of different parts of the aircraft will cause different degrees of impact. For example, the icing of the wings and tail will lead to changes in the turbulent flow field, which will seriously affect the aerodynamic performance, maneuverability and stability of the aircraft. Icing may cause engine shutdown, compromising flight safety. Therefore, it is of great significance to explore the mechanism of icing, evaluate the aerodynamic performance and safety of aircraft under icing meteorological conditions, and carry out research work such as prevention and deicing. In order to explore the icing mechanism and eva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24G06T7/80
CPCG01B11/24G06T7/80G06T2207/30244
Inventor 左承林马军梁磊孙冬宁熊建军宋晋谢琦
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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