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Data processing method used for heat map technology

A technology of data processing and technology, applied in the field of image processing, can solve the problems of CMOS camera noise, etc., and achieve the effects of reducing time noise, improving heat flow calculation accuracy, and reducing cloud image noise

Inactive Publication Date: 2018-07-06
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0004] In order to overcome the lack of large noise in the heat map test of the CMOS camera, the present invention provides a data post-processing method for the heat map technology, which can ensure the accuracy of the test data while reducing the noise of the result

Method used

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  • Data processing method used for heat map technology
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  • Data processing method used for heat map technology

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Embodiment Construction

[0027] The data processing method that the present invention is used for thermal map technology comprises the following steps:

[0028] (1) The surface of the test model is sprayed with a temperature-sensitive coating, which radiates fluorescence under the excitation of an ultraviolet light source, and continuously obtains the fluorescence images of the test model through a high-speed CMOS camera;

[0029] (2) Obtain the light intensity distribution of multiple fluorescent images before the test, and obtain the initial average light intensity distribution of the model surface before the incoming flow by arithmetic mean, reduce the random noise of the image before the test, and ensure the accuracy of the initial frame ;

[0030] (3) Start the test. During the test, the temperature of the test model increases and the surface fluorescence intensity decreases. The fluorescence image acquired by the high-speed CMOS camera is filtered by median value to reduce the spatial noise of t...

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Abstract

The invention relates to a data processing method used for a heat map technology. Through arithmetic averaging of multiple images before incoming flow establishment, initial image noises are reduced;through a multi-parameter least square optimization algorithm in a given function form, the noises in a test process are reduced; and finally the test data precision and the heat flow change details are ensured while the noises of a test result of a CMOS camera are reduced. The CMOS camera is adopted; and compared with a conventional single point type sensor, total flow field heat flow data in a view field range of the camera can be obtained, so that the data is more detailed, and not only quantitative data but also a distribution trend of heat flow can be obtained.

Description

Technical field: [0001] The invention relates to a data processing method for heat map technology, in particular to a data processing method for large-area non-contact measurement of model surface heat flux in a pulsed wind tunnel, and belongs to the technical field of image processing. Background technique: [0002] For the prediction of the thermal environment of hypersonic vehicles, traditional test and measurement methods use point or integral heat flow sensors, which can only obtain the distribution of heat flow at discrete points, and are easy to damage the surface structure of the model and interfere with the flow field; The graph technology adopts non-contact measurement method, which can obtain large-area heat flow data without disturbing the flow field, and has become an important direction for the development of heat flow measurement technology. [0003] Cameras used for heat map technology are mainly divided into two categories, CCD cameras and CMOS cameras; amon...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T7/00G01M9/06
CPCG01M9/067G06T7/0002G06F30/20
Inventor 贾广森韩曙光纪锋文帅朱万琳陈星毕志献
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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