[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： uhLmyK  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 Z5-'|h$|  
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背景： LXV6Ew5E  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 7Z3qaXPH  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 m/nn}+*C  
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步骤 9Wrclai  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 +]vl8, 4@  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） # t Ki6u  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ^dD?riFAk  
例如下所示： \0*LfVr;P  
Sample name:  EDF-C1-56 e)"cm;BJ^P  
Merging data from file EDF-C1-56 0-0.txt +JG"eh&J"H  
Finished merging RPC data for sample EDF-C1-56 @CDRbXoFk  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^umAfk5r?H  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 M-|2W~YU  
a. 创建一个新的散射库 1Tr=*b %f  
b. 散射模型命名 RBwV+X[B  
c. 改变散射模型为“Tabulated BSDF”. B=`!  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） /p"R}&z  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 Z4' v  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 7yl'!uz)9  
g. 点击OK pE,BE%
 
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 IA`  
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脚本代码： Z9I./s9  
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'#Language "WWB-COM" @
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Option Explicit ZrS!R[  
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Sub Main # 95/,k  
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    'Cleanup N0C5FSH  
    ClearOutputWindow() HfPeR8I%i  
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    Print "Merging RPC Photonics BSDF Data Files" I|H mbTXa  
    SetTextColor(255,0,0) >w2u  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." w"|c;E1;_  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." dM$S|,H  
    SetTextColor(0,0,0) ZT#G
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    'Current directory of this script (should be the same as the text files being merged) r_m&Jl@4  
    Dim cDir As String B#yyO>0k]  
    cDir = MacroDir$ & "\" jtwO\6t&  

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    'Array which will be populated with the list of files to be merged E?uv&evPK7  
    Dim fList() As String, curFile As String iy9]Y5b   
    GetFileList( cDir, fList ) /([aD~.  
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    Print "" )Be;Zw.|  
    Print "Files found for merging:" oL;/Qan  
    For Each curFile In fList @gOgs  
        Print Chr(9) & curFile dmO|PswW  
    Next ZHJzh\?  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /2@@v|QL  
    Dim nameArray() As String, sampName As String d?n~9_9e  
    nameArray = Split(fList(0)," 0-0.txt") V*~5*OwB  
    sampName  = nameArray(0) iDsjIW\j  
    Print "" K]l)z* I  
    Print "Sample name: " & Chr(9) & sampName yS""*8/  
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    'Open an output file and write the FRED header data y8@!2O4  
    Dim outFile As String ;D:v@I$I  
    outFile = cDir & sampName & "_FRED.txt" )UJMmw\  
    Open outFile For Output As #1 5{> cfN\q  
    Print #1, "type bsdf_data" P}jr 8Z  
    Print #1, "format angles=deg bsdf=value scale=1" 5cU8GgN`  
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    'Loop the file list, skip the two header lines and write the remaining data to file :`K;0`C+  
    Dim lineArray() As String, curLine As Long ^BZdR<;  
    For Each curFile In fList 8 _J:Yg  
        Print "Merging data from file " & curFile 21qhlkdc  
        ReadFile( cDir & curFile, lineArray ) ]nh)FMo  
        For curLine = 2 To UBound(lineArray) ;z68`P-  
            Print #1, lineArray(curLine) ;b^@o,=  
        Next 809-p_)B  
    Next ;/
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    'Close the output file !ktr|9Bl  
    Close #1 a/ZfPl0Ns[  
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    Print "Finished merging RPC data for sample " & sampName
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    Print "FRED formatted data file: " & Chr(9) & outFile 62"ND+D4  
End Sub OX"`VE  
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'Utility function to read the contents of a file into an array of strings. ?S_S.B
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Function ReadFile(ByVal fileName As String, _
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                  ByRef lineArray() As String) As Long - M]C-$  
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    ReadFile = -1 -[=`bHo  
    Dim oFSO As Object &Ru6Yt0W  
    Set oFSO = CreateObject("Scripting.FileSystemObject") a'Z"Yz^Eo  
    Erase lineArray ]q j%6tz  
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    Dim fid As Long L`\ILJz  
    If oFSO.fileexists( fileName ) Then )JPcSy*  
        fid = FreeFile() j{vzCRa>8  
        Open fileName For Input As fid &e(de$}xt  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) S%4K-I  
        Close fid KH;e)91  
    End If 6Z$T&Ul{  
    Set oFSO = Nothing ,Y*f]  
    Return UBound( lineArray ) Y9WH%  
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End Function C}!|K0t?
 
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Sub GetFileList( ByVal in_dir As String, _ -+L1Hid.7  
                 ByRef in_flist() As String ) 4&\m!s  
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    'Redimension the file list array */1z=  
    Erase in_flist 4l|Am3vzX  
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    'Tracks how many files are found b7$?'neH/.  
    Dim fCount As Long M1^pW63  
    fCount = 0 3laSPih[.  
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    'Recurse directory and search for text files 0<Y)yNsV  
    Dim f As String w4OVfTlN  
    f = Dir$(in_dir & "*.txt") ~"-wS
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    While f <> "" *"#>Ov>  
        ReDim Preserve in_flist(fCount) %spR7J\"/  
        in_flist(fCount) = f {f!mm3'2v  
        fCount += 1 AOTI&v  
        f = Dir$() -Xj+7}4  
    Wend kxKBI{L  
    ReDim Preserve in_flist(fCount-1) h\1_$ac  
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End Sub B *:6U+I  
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