CN107193897B - Method and system for testing and establishing BRDF (bidirectional reflectance distribution function) database of aerospace coating material - Google Patents
Method and system for testing and establishing BRDF (bidirectional reflectance distribution function) database of aerospace coating material Download PDFInfo
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Abstract
The invention discloses a method and a system for testing and establishing a BRDF database of aerospace coating materials, and belongs to the field of stray light testing and stray light analysis of optical design. The invention comprises two parts: the method comprises the steps of firstly, exporting BRDF data codes into specific type files, wherein the file types are Excel and Txt formats or stray light analysis and calculation software Tracepro and LightTools data formats; wherein the BRDF data is 316800 data of 11 aerospace coating materials; and the other is a software system based on Matlab GUI, which can extract data in a single or combined form and can perform two-dimensional drawing or three-dimensional rectangular coordinate and spherical coordinate drawing on the combined data. The invention provides a whole set of solution for acquiring the software application from the BRDF data, and the method has the advantages of friendly software interface and convenient and fast data application method.
Description
Technical Field
The invention relates to a method and a system for testing and establishing a Bidirectional Reflection Distribution Function (BRDF) database of 11 aerospace coating materials, in particular to a method and a system for testing and establishing a BRDF database of aerospace coating materials, belonging to the technical field of stray light testing and analysis in the aspect of optical design.
Background
When an optical system working on a satellite or an airplane, such as an optical device of an aerospace camera, a navigation camera, an obstacle avoidance camera, a sun sensor and the like, works, some non-imaging light rays, such as direct solar rays, or light rays reflected by the surface of the moon, or light rays reflected by the surface of the earth, the atmosphere and the like, pass through different surfaces and are reflected or scattered for multiple times, and enter the optical system of the aerospace camera, the navigation camera, the obstacle avoidance camera, the sun sensor and the like, so that stray radiation is formed on an image surface, and normal imaging is influenced. The optical system working in the space flight and aviation environment has the advantages that the surface coating material of the optical system corresponds to different reflection and scattering characteristics under different working conditions, the characteristics have no formula change rule, and the bidirectional reflection distribution function of the material of the reflecting surface or the scattering surface of the surface coating material is mastered through experimental tests so as to carry out effective stray light analysis and calculation. At present, a systematized database and a method for applying a large amount of data to stray light analysis software do not exist in the field, researchers mainly rely on a small amount of BRDF data to solve through a formula to obtain an Abg model of BRDF, and then manually input the Abg model data into Tracepro for simulation analysis. The method depends on less original data, the Abg model obtained by fitting cannot accurately reflect the scattering characteristics of the material, the operation process is complicated, the efficiency is low, and the simulation precision and the working efficiency of the stray radiation research are influenced.
In the field of aerospace engineering, the two-way reflection distribution function of a corresponding aerospace coating material needs to be tested urgently, a corresponding two-way reflection distribution function database system is established, and a method for efficiently applying data to stray light analysis software is mastered, so that related research in the field of stray light radiation can be smoothly carried out. The invention aims to provide a database system which improves simulation precision and is convenient to use and a method for improving BRDF data application efficiency for researchers in the field of stray light radiation, and helps researchers to perform stray radiation simulation analysis on relevant optical mechanisms more accurately and efficiently and find out corresponding stray radiation protection countermeasures.
Disclosure of Invention
The invention aims to test the bidirectional reflection distribution functions of 11 aerospace coating materials and provide a method and a system for testing and establishing an aerospace coating material BRDF database, aiming at the current situation that the original bidirectional reflection distribution function database system and a data application method are lacked in the field of stray radiation analysis of aerospace coating materials.
The invention relates to a method and a system for testing and establishing a BRDF database of aerospace cladding materials, which comprises a whole set of bidirectional reflection distribution function testing method and a system related to data processing and application methods; specifically, data of a bidirectional reflection distribution function of 11 aerospace coating materials are provided, and a whole set of application scheme mainly comprising data extraction and conversion, free query, graphical observation, data file export and application of data to stray light analysis software is provided.
The system related to the data processing and application method comprises a space flight and aviation cladding material bidirectional reflection distribution function database system and a method for applying the bidirectional reflection distribution function database to stray radiation analysis software;
the aerospace cladding material bidirectional reflection distribution function database system comprises a database module, a data query module, a data display module, a data drawing module and a data export module;
the BRDF data of the 11 aerospace aviation coating materials comprises the following material names:
1. a double-sided pressure-sensitive adhesive tape of double-sided aluminum-plated polyester film;
2. the stainless steel foil high-temperature-resistant high-radiation thermal control coating of the heat shield for the satellite;
3. a nickel foil;
4. a polyimide film;
5. low temperature multilayers;
6. high temperature multilayers;
7. a conductive polyimide film aluminized secondary surface mirror;
8. double-sided aluminized polyester perforated film;
9. plating a polyimide film on one side;
10. double-sided aluminized polyester film;
and 11. silver-plated secondary surface mirror with conductive layer F46;
the 11 aerospace cladding materials comprise all aerospace cladding materials up to now; in testing the bi-directional reflection distribution function of these cladding materials, the following 15 wavelengths were selected:
380nm、430nm、480nm、530nm、580nm、600nm、630nm、680nm、700nm、730nm、780nm、958nm、968nm、978nm、988nm
during testing, for each of the clad materials, the following 8 incident zenith angles were tested:
0°、10°、20°、30°、40°、50°、60°、70°；
the following 4 azimuth angles of incidence were tested:
0°、10°、20°、30°；
the following 15 emergent zenith angles were tested:
-70°、-60°、-50°、-40°、-30°、-20°、-10°、0°、10°、20°、30°、40°、50°、60°、70°；
the following 4 emission azimuths were tested:
0°、10°、20°、30°；
the combination of these attribute parameters finally forms 316800 Bidirectional Reflection Distribution Function (BRDF) data, and establishes corresponding database module;
the data import module comprises a user data import mode and a database mode;
the data query module comprises a single query and a combined query;
the data display module comprises two display forms of text display and table display, and the table display can be cancelled;
the data drawing module comprises two-dimensional drawing, three-dimensional rectangular coordinate drawing and spherical coordinate drawing;
the data export module comprises two types of export to Excel and Txt and export to Tracepro and LightTools;
the connection relation of all modules in the aviation cladding material bidirectional reflection distribution function database system is as follows:
the data import module imports data tested by the instrument into a database module to provide a user-defined database for other modules, the data query module extracts needed BRDF data from the database, and the data are sent to a data display module for display, or sent to a data drawing module for drawing an image, or sent to a data export module for exporting a specific file;
the functions of each module in the aerospace coating material bidirectional reflection distribution function database system are as follows:
the bidirectional reflection distribution function data in the database module can be used for carrying out stray radiation protection design and simulation in the field of aerospace research;
the data import module can extract data from the BRDF data file output by the tester and apply the data to the system, namely: the user can test BRDF data by using an instrument without using a self-contained database of the system, then the BRDF data is imported into the system to form a user database, and functions provided by other modules of the system are continuously used;
the data query module provides the functions of a single query or a plurality of combined queries of the database module: the user can select various parameters such as wavelength, angle and the like through a drop-down list box, or directly input the parameters in an edit box to inquire a single item; when a large amount of data needs to be subjected to statistical calculation or drawing, a user can click a combined query mode, select various parameters through check boxes and then query;
the data display module comprises two display forms of text display and table display, and the table display can be cancelled. The data inquired by the user can be visually displayed on the interface, and the displayed text can be directly copied for other purposes.
The data drawing module provides two-dimensional drawing and three-dimensional rectangular coordinate and spherical coordinate drawing functions of data, and a user can visually observe data changes. When the data of the combined query is two-dimensional data, the software automatically draws a two-dimensional line graph. When the data is three-dimensional, the software renders a three-dimensional rectangular coordinate graph and a spherical coordinate diagram. In the three-dimensional rectangular coordinate graph, the Z axis is a Bidirectional Reflectance Distribution Function (BRDF) value, and the image is subjected to interpolation smoothing processing. In the schematic diagram of the spherical coordinates, when the incident zenith angle and the incident azimuth angle of the incident light are fixed, the BRDF is taken as the radius, and a spherical coordinate ray diagram and a spherical coordinate curved surface diagram of different emergent zenith angles and emergent azimuth angles are drawn.
The data export module comprises two types of export to Excel, Txt and export to Tracepro and LightTools. The data inquired by the user can be output as the BRDF data file with special format which can be directly loaded by stray light analysis software Tracepro and LightTools and used for simulation analysis.
The method for applying the bidirectional reflection distribution function database to the stray radiation analysis software is realized by the following steps:
step 1: identifying attribute information which mainly comprises materials and wavelengths of data to be exported;
the data obtained by using the database system to carry out combined query is a cellular array with various attribute information selected when a user queries the data, and the attribute information is identified by character matching;
step 2: calculating the position of the corresponding data in the BRDF data cell array;
wherein, the corresponding data refers to the data needing to be exported in the step 1; step 2, calculating the offset of each piece of BRDF data in the cellular array according to the attribute information output in the step 1 and by combining the arrangement rule of the BRDF data in the cellular array;
and step 3: converting the angle mode of the database system into the angle mode of the simulation software;
in the database system, the angle mode is a classical BRDF definition mode, and needs to be converted when being output to Tracepro according to thetabIs the exit azimuth angle, theta, in the database angular coordinate systemtFor the emitting azimuth angle in the Tracepro angular coordinate system, the emitting azimuth angle conversion relationship is: when the emergent zenith angle of the database is negative, thetat＝270°-θb(ii) a When the incident zenith angle of the database is not negative, the conversion relation of the emergent azimuth angle is as follows: thetat＝90°-θb(ii) a When the angle mode is output to Lighttools, the angle mode is converted into a Havit BRDF model mode;
and 4, step 4: the data export module encodes data to Tracepro and Lighttools;
the method comprises the steps that an output file type is required to be selected when the BRDF file is written into an external file, the BRDF attribute, the BRDF data and format characters specific to the selected format are arranged in a cellular array according to the encoding format required by the selected file type, and when the BRDF file is exported to Tracepro, the BRDF file is encoded into a Scattermaster file type file; when the files are exported to Lighttools, the files are coded into HarveyShack type files;
and 5: the data export module exports data to an external file, specifically:
and the data export module calls a Matlab file flow function to output the cellular array arranged in the step 4 to the file corresponding to the suffix line by line, and names the file according to the material and wavelength attributes of the BRDF data.
Step 6: tracepro and Lighttools read the exported files;
6.1 when Tracepro reads the exported file, loading the file by means of a BSDF connector plug-in of Tracepro software, filling information contained in the file name, selecting the solving type as BRDF, and outputting data to Tracepro;
6.2 when Lighttools reads the exported files, loading the files by means of a Harvey-Shack plug-in of Lighttools software, setting parameters, and outputting data to the Lighttools;
so far, through steps 1 to 6, the method of applying the bidirectional reflection distribution function database to the stray radiation analysis software is completed.
Advantageous effects
Compared with the existing BRDF database and data application method, the method and the system for testing and establishing the BRDF database of the aerospace coating material have the following beneficial effects:
1. the system is the first two-way reflection distribution function database system for the aerospace coating material in China at present, can effectively solve the problem of lack of basic two-way reflection distribution function data in the field of stray analysis and calculation, and can well meet the requirements of aerospace scientific research;
2. the data provided by the system can be analyzed more accurately, the graphical query display interface provided by the system can enable the data to be used more conveniently and more vividly and visually;
3. the system can export BRDF data into xls, csv and txt formats, so as to meet diversified use requirements of users;
4. the application method provided by the system can generate a material surface bidirectional reflection distribution function characteristic data file which can be identified by stray light analysis and calculation software, the data file can be read in by the software, a user does not need to calculate an Abg model and manually input the software, and the scientific research efficiency is improved.
Drawings
FIG. 1 is a system diagram and process flow diagram of a method and system for testing and building a BRDF database for aerospace cladding materials in accordance with the present invention;
FIG. 2 is a schematic diagram of a software interface of a method and a system for testing and establishing a BRDF database of aerospace coating materials and a database system in embodiment 1 according to the invention;
FIG. 3 is a three-dimensional rectangular coordinate diagram plotted according to embodiments of the method and system for testing and building a BRDF database for aerospace cladding materials of the present invention;
FIG. 4 is a spherical coordinate diagram plotted according to an embodiment of the method and system for testing and building a BRDF database for aerospace cladding materials of the present invention;
wherein, in fig. 2, 1-single item query selection area, 2-single item query button, 3-single item query input area, 4-comprehensive information display area, 5-table display area, 6-combined item query button, 7-combined item check panel, 8-combined query confirmation area, 9-drawing button, 10-export data button, 11-software status panel, 12-menu bar;
in FIG. 3, X-axis-outgoing azimuth angle, Y-axis-outgoing zenith angle, and Z-axis-BRDF value;
in FIG. 4, 1-is a discontinuous straight line grid-shaped sphere, 2-is an auxiliary coordinate axis, 3-is a black solid line, and 4-is a curved surface with gray scale.
Detailed Description
The invention is further illustrated and described in detail below with reference to the figures and examples.
Example 1
This example illustrates in detail the complete process of querying, plotting and exporting the BRDF data to Tracepro when the nickel foil material is required to be specifically implemented under the irradiation of light rays with a wavelength of 530nm, an incident zenith angle of 60 degrees and an incident azimuth angle of 10 degrees.
Fig. 1(a) is a system structure diagram of the BRDF database system for aerospace cladding materials of the present invention, and as can be seen from fig. 1(a), the data import module imports data tested by an instrument into the database module, the data query module extracts required BRDF data from the database, and these data are output to the data display module for display, or output to the data drawing module for drawing an image, or output to the data export module for encoding export into a file with a specific format.
FIG. 1(B) is a flow chart of the database system data application method of the present invention, and it can be seen from FIG. 1(B) that the method first judges the export type, and when the type is Excel or Txt, the data passes through the identification attribute, the positioning BRDF, the coding unit cell, and finally is output as the required file; and when the types are Tracepro and Lighttools, continuously judging, if the data file type is Lighttools, leading the data into a Lighttools software internal database through an identification attribute, positioning BRDF, angle system conversion and coding cells, outputting a BRDF file, finally leading the data into the Lighttools software internal database through a Harvey-Shack plug-in, if the data file type is Tracepro, leading the data into the Tracepro software internal database through the identification attribute, positioning BRDF, angle system conversion and coding cells, outputting a file required by the BRDF, and finally leading the data into the Tracepro software internal database through the BSDF connector.
Fig. 2(a) and 2(B) are software interface diagrams of the present invention. The software has two layers of interfaces, the interface in fig. 2(a) is a software default interface, the interface in fig. 2(B) is an interface for information such as the selection angle of the combined query module, wherein 1-single item query selection area, 2-single item query button, 3-single item query input area, 4-comprehensive information display area, 5-table display area, 6-combined item query button, 7-combined item check panel, 8-combined query confirmation area, 9-drawing button, 11-software status panel, and 12-menu bar.
Example 1 using data of software itself, without importing data from outside, the whole process will start with data query, click the 6-combination item query button, switch the interface to the one shown in fig. 2(B), click the nickel foil, 530nm wavelength, 60 degree incident zenith angle and 10 degree incident azimuth angle, and select all the emergent zenith angle and emergent azimuth angle in the 7-combination item selection panel, click the "confirm" button of the 8-combination query confirm area, display the data in the 4-comprehensive information display area and the 5-table display area, click the 9-drawing button, draw the three-dimensional rectangular coordinate graph shown in fig. 3 and the spherical coordinate graph shown in fig. 4, click the 10-export data button, pop up a window for selecting export type, select "tracetra, Lighttools" and "proce" in turn, select file save location, the software recodes the searched array formed by the BRDF data and the corresponding attributes of the data according to the character arrangement format of the Scattermaster file of Tracepro to form a BRDF data file, opens the BSDF connector of Tracepro, reads the files, and finally imports the data into the Tracepro by selecting an 'Export' command.
Fig. 3 is a three-dimensional rectangular coordinate diagram drawn in the present embodiment, the title is an abbreviated name of the query item in the present embodiment, the X axis is the emergent azimuth angle and the unit is degree, the Y axis is the emergent zenith angle and the unit is degree, and the Z axis is the BRDF value and has no unit. The gray scale of the data represents the magnitude of the corresponding coordinate BRDF value.
Fig. 4 is a spherical coordinate diagram drawn in the present embodiment, the title is an abbreviated name of the item queried in the present embodiment, and the X-axis, the Y-axis and the Z-axis in the spherical coordinate are only used for distinguishing background scales, and have no practical meaning. The positive direction of the X axis is the direction of 0 degree of the azimuth angle, and the positive direction of the Z axis is the direction of zero degree of the zenith angle. The 1-discontinuous straight line latticed sphere is a unit sphere with the radius of 1, the sphere only keeps a net-shaped outline, 2-an auxiliary coordinate axis and an auxiliary axis parallel to the coordinate axis, a 3-black solid line is an incident ray, a 4-curved surface with gray scale is a curved surface formed by BRDF values with different scattering angles, a zenith angle corresponding to each value is an emergent zenith angle, a corresponding azimuth angle is an emergent azimuth angle, and the corresponding sphere radius is the value of BRDF.
While the foregoing is directed to the preferred embodiment of the present invention, it is not intended that the invention be limited to the embodiment and the drawings disclosed herein. Equivalents and modifications may be made without departing from the spirit of the disclosure, which is to be considered as within the scope of the invention.
Claims (8)
1. The aerospace cladding material bidirectional reflection distribution function database system is characterized in that: the system comprises a database module, a data query module, a data display module, a data import module, a data drawing module and a data export module;
the database module comprises BRDF data of 11 aerospace coating materials;
the data import module comprises a user data import mode and a database mode;
the data query module comprises a single query and a combined query;
the data display module comprises two display forms of text display and table display, and the table display can be cancelled;
the data drawing module comprises two-dimensional drawing, three-dimensional rectangular coordinate drawing and spherical coordinate drawing;
the data export module comprises two types of export to Excel and Txt and export to Tracepro and LightTools;
the connection relation of all modules in the aviation cladding material bidirectional reflection distribution function database system is as follows:
the data import module imports data tested by the instrument into a database module to provide a user-defined database for other modules, the data query module extracts needed BRDF data from the database, and the data are sent to a data display module for display, or sent to a data drawing module for drawing an image, or sent to a data export module for exporting a specific file;
the functions of each module in the aerospace coating material bidirectional reflection distribution function database system are as follows:
the bidirectional reflection distribution function data in the database module can be used for carrying out stray radiation protection design and simulation in the field of aerospace research;
the data import module can extract data from the BRDF data file output by the tester and apply the data to the system, namely: the user can test BRDF data by using an instrument without using a self-contained database of the system, then the BRDF data is imported into the system to form a user database, and functions provided by other modules of the system are continuously used;
the data query module provides the functions of a single query or a plurality of combined queries of the database module: the user can select each parameter through a drop-down list box or directly input the parameters in an edit box to inquire a single item; when a large amount of data needs to be subjected to statistical calculation or drawing, a user can click a combined query mode, select various parameters through check boxes and then query;
the data display module comprises two display forms of text display and table display, and the table display can be cancelled; the data inquired by the user can be visually displayed on the interface, and the displayed text can be directly copied;
the data drawing module provides two-dimensional drawing, three-dimensional rectangular coordinate and spherical coordinate drawing functions of data, and a user can visually observe data change; when the data of the combined query is two-dimensional data, the software automatically draws a two-dimensional line graph; when the data is three-dimensional, software draws a three-dimensional rectangular coordinate graph and a spherical coordinate schematic diagram; in the three-dimensional rectangular coordinate graph, the Z axis is a bidirectional reflection distribution function value BRDF, and the image is subjected to interpolation smoothing processing; in the spherical coordinate schematic diagram, when an incident zenith angle and an incident azimuth angle of an incident ray are fixed, a BRDF is taken as a radius, and a spherical coordinate ray diagram and a spherical coordinate curved surface diagram of different emergent zenith angles and emergent azimuth angles are drawn;
the data export module comprises two types of export to Excel and Txt and export to Tracepro and LightTools; data inquired by a user can be output as special format BRDF data files which can be directly loaded by stray light analysis software Tracepro and LightTools and used for simulation analysis, and can be edited and checked in xls, csv or txt format;
the BRDF data of 11 aerospace coating materials are included, and the material names are as follows:
(1) double-sided aluminized polyester film single-sided pressure sensitive tape;
(2) a heat shield stainless steel foil high-temperature-resistant high-radiation thermal control coating for the satellite;
(3) a nickel foil;
(4) a polyimide film;
(5) low temperature multilayer;
(6) high temperature multilayer;
(7) a conductive polyimide film aluminized secondary surface mirror;
(8) double-sided aluminized polyester perforated film;
(9) single-sided aluminized polyimide film;
(10) double-sided aluminized polyester film;
silver-plated secondary surface mirror with conductive layer F46;
the 11 aerospace cladding materials comprise all aerospace cladding materials up to now; in testing the bi-directional reflection distribution function of these cladding materials, the following 15 wavelengths were selected:
380nm、430nm、480nm、530nm、580nm、600nm、630nm、680nm、700nm、730nm、780nm、958nm、968nm、978nm、988nm；
during testing, for each of the clad materials, the following 8 incident zenith angles were tested:
0°、10°、20°、30°、40°、50°、60°、70°；
the following 4 azimuth angles of incidence were tested:
0°、10°、20°、30°；
the following 15 emergent zenith angles were tested:
-70°、-60°、-50°、-40°、-30°、-20°、-10°、0°、10°、20°、30°、40°、50°、60°、70°；
the following 4 emission azimuths were tested:
0°、10°、20°、30°；
the combination of these attribute parameters finally forms 316800 Bidirectional Reflectance Distribution Function (BRDF) data, and establishes a corresponding database module.
2. A method of applying the two-way reflection distribution function database system for aerospace cladding materials of claim 1 to stray radiation analysis software, wherein: the method comprises the following steps:
step 1: identifying attribute information which mainly comprises materials and wavelengths of data to be exported;
step 2: calculating the position of the corresponding data in the BRDF data cell array;
wherein, the corresponding data refers to the data needing to be exported in the step 1;
and step 3: converting the angle mode of the database system into the angle mode of the simulation software;
and 4, step 4: the data export module encodes data to Tracepro and Lighttools;
and 5: the data export module exports data to an external file;
step 6: tracepro and Lighttools read exported files.
3. The method of claim 2, wherein: the data obtained by the database system combined query in the step 1 is a cellular array with various attribute information selected by a user when querying the data, and the various attribute information is identified by character matching.
4. The method of claim 2, wherein: and 2, specifically realizing: and (3) calculating the offset of each piece of BRDF data in the cell array according to the attribute information output in the step (1) and by combining the arrangement rule of the BRDF data in the cell array.
5. The method of claim 2, wherein: the angle mode of the database system in the step 3 is a classic BRDF definition mode, and conversion is needed when the angle mode is output to Tracepro, and the angle mode is thetabIs the exit azimuth angle, theta, in the database angular coordinate systemtFor the emitting azimuth angle in the Tracepro angular coordinate system, the emitting azimuth angle conversion relationship is: when the emergent zenith angle of the database is negative, thetat＝270°-θb(ii) a When the incident zenith angle of the database is not negative, the conversion relation of the emergent azimuth angle is as follows: thetat＝90°-θb(ii) a And when outputting to Lighttools, converting the angle mode into a Havit BRDF model mode.
6. The method of claim 2, wherein: step 4, writing in an external file, selecting an output file type, arranging BRDF attributes, BRDF data and format characters specific to the selected format into a cellular array according to the coding format required by the selected file type, and coding the BRDF attributes, the BRDF data and the format characters into a Scattermaster file type file when the BRDF attributes, the BRDF data and the format characters are exported to Tracepro; when exported to Lighttools, the files are encoded as harveysshack type files.
7. The method of claim 2, wherein: step 5, specifically: and calling a Matlab file flow function to output the cell arrays arranged in the step 4 to the files corresponding to the suffixes line by line, and naming the files according to the material and wavelength attributes of the BRDF data.
8. The method of claim 2, wherein: step 6, specifically:
6.1 when Tracepro reads the exported file, loading the file by means of a BSDF connector plug-in of Tracepro software, filling information contained in the file name, selecting the solving type as BRDF, and outputting data to Tracepro;
6.2 when Lighttools reads exported files, the files need to be loaded by means of the Harvey-Shack plug-in of Lighttools software, parameters are set, and data are output to Lighttools.
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