[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ZnD(RM  
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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。 3 /LW6W|  
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背景：
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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。 sKDL=c;?j  
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。 MMf_  
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步骤 W";Po)YC  
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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。 k]yv#Pa  
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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） opqf)C  
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 qQCds}<w  
例如下所示： qEnmms1  
Sample name:  EDF-C1-56 fl<j]{*v  
Merging data from file EDF-C1-56 0-0.txt }Z% j=c"d  
Finished merging RPC data for sample EDF-C1-56 E# *`u  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &_$xMM,X  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 avxI%%
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a. 创建一个新的散射库 P;p;o]  
b. 散射模型命名 4j~WrdI*  
c. 改变散射模型为“Tabulated BSDF”. 9,0}}3J  
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 ） @gihIysf  
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。 o^<W3Z  
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， ?)FY7[x.  
g. 点击OK SW=%>XKkh  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 <u2iXH5w  
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脚本代码： SNtOHTQ  
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'#Language "WWB-COM" a`S3v  
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Option Explicit Ct}rj-L<i  
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Sub Main M,bcT
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    'Cleanup u&$1XZ!es  
    ClearOutputWindow() n_-k <
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    Print "Merging RPC Photonics BSDF Data Files" scR+F'M  
    SetTextColor(255,0,0) t}Kz
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." dhI+_z   
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 8'Q1'yc  
    SetTextColor(0,0,0) qN6
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    'Current directory of this script (should be the same as the text files being merged) bv'Z~@<c  
    Dim cDir As String B-aJn8>/  
    cDir = MacroDir$ & "\" e}q!m(K]e-  
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    'Array which will be populated with the list of files to be merged j%E9@#  
    Dim fList() As String, curFile As String \t]aBT,  
    GetFileList( cDir, fList ) p0j-$*F  
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    Print "" gPr&9pHU  
    Print "Files found for merging:" 5c3&4,,eR  
    For Each curFile In fList LX iis)1  
        Print Chr(9) & curFile &^@IAjxn  
    Next N;XJMk_ H  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. w}Xy;0c  
    Dim nameArray() As String, sampName As String _D."KU|  
    nameArray = Split(fList(0)," 0-0.txt") 0+"P1/  
    sampName  = nameArray(0) 3|.KEJC"
 
    Print "" QD*(wj  
    Print "Sample name: " & Chr(9) & sampName ekO*(vQ~  
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    'Open an output file and write the FRED header data HZzdelo  
    Dim outFile As String "=XRonQZ  
    outFile = cDir & sampName & "_FRED.txt" >`+-Yi$(\  
    Open outFile For Output As #1 X.<2]V7!  
    Print #1, "type bsdf_data" qAR}D~t  
    Print #1, "format angles=deg bsdf=value scale=1" ^t
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    'Loop the file list, skip the two header lines and write the remaining data to file D`r_ Dz  
    Dim lineArray() As String, curLine As Long 6'vt '9  
    For Each curFile In fList qGc>+!y  
        Print "Merging data from file " & curFile z}*74lhF  
        ReadFile( cDir & curFile, lineArray ) ?u
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        For curLine = 2 To UBound(lineArray) 6d|%8.q1  
            Print #1, lineArray(curLine) sBD\;\I  
        Next NI% ()  
    Next O{`r.H1',  
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    'Close the output file ^LJ
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    Close #1 .6#Y-iJqc  
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    Print "Finished merging RPC data for sample " & sampName 9{V54ue;  
    Print "FRED formatted data file: " & Chr(9) & outFile ](H vx  
End Sub BFyVq  
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'Utility function to read the contents of a file into an array of strings. _Vxk4KjP5  
Function ReadFile(ByVal fileName As String, _ rJl'+Ae9N|  
                  ByRef lineArray() As String) As Long )t$|'c}  
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    ReadFile = -1 Gr?[s'Ze  
    Dim oFSO As Object &-1;3+#w  
    Set oFSO = CreateObject("Scripting.FileSystemObject") f; 1C)  
    Erase lineArray &MsBcP[
 
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    Dim fid As Long xlWT
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    If oFSO.fileexists( fileName ) Then O<v9i4*  
        fid = FreeFile() RW. >;|m  
        Open fileName For Input As fid Gd5J<K  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) (j;6}@  
        Close fid ?krgZ;Jj  
    End If y}bE'Od  
    Set oFSO = Nothing H:HJHd"W  
    Return UBound( lineArray ) H|iY<7@  
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End Function 13nXvYo'  
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Sub GetFileList( ByVal in_dir As String, _ m*S[oy&  
                 ByRef in_flist() As String ) zbDM+;  
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    'Redimension the file list array ard<T}|N  
    Erase in_flist SlZ>N$E  
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    'Tracks how many files are found 4W''j[Y/  
    Dim fCount As Long Ih.6"ISK}  
    fCount = 0 a jCx"J  
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    'Recurse directory and search for text files C%csQ m  
    Dim f As String VfiMR%i}  
    f = Dir$(in_dir & "*.txt") +L86w7  
    While f <> "" eY1$smh t  
        ReDim Preserve in_flist(fCount) ^^I3%6UY  
        in_flist(fCount) = f *XK9-%3  
        fCount += 1 I(dMiL  
        f = Dir$() ;ip"V 0`  
    Wend {rG`Upp  
    ReDim Preserve in_flist(fCount-1) )c#m<_^  
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End Sub +0Rr5^8u