[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Z$X2*k6PK  
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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。 9Vxsv*OR,  
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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。 ,COSpq]6  
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。 ^TVica  
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步骤 @NlnZfMu  
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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。 }!pC}m  
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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） )+RGXVp  
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 o(]kI?
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例如下所示： r9%4q4D?>9  
Sample name:  EDF-C1-56 _T6WA&;8  
Merging data from file EDF-C1-56 0-0.txt 6JmS9ho  
Finished merging RPC data for sample EDF-C1-56 *1ekw#
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5Jp@n .  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 G<4H~1?P  
a. 创建一个新的散射库 JiDX|Q<c  
b. 散射模型命名 p!AQ
  
c. 改变散射模型为“Tabulated BSDF”. |08tQ  
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 ） N12K*P[!  
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。 Q6_!I42Y`  
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， UB|Nx(V s  
g. 点击OK (jPN+yQ  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 KG'4;Z5J  
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脚本代码： @8DBLn w  
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'#Language "WWB-COM" }bIEWho  
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Option Explicit 5L42'gJ  
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Sub Main FnP/NoZa>  
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    'Cleanup rMTtPuc2  
    ClearOutputWindow() $ZK4Ps -$  
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    Print "Merging RPC Photonics BSDF Data Files" W+H27qsv  
    SetTextColor(255,0,0) 8/-GrdyE  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." mz+>rc  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ?T$i  
    SetTextColor(0,0,0) wQ2'%T|t  
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    'Current directory of this script (should be the same as the text files being merged) ^^}  
    Dim cDir As String X3!btxa%t  
    cDir = MacroDir$ & "\" ?)",}XL6  
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    'Array which will be populated with the list of files to be merged ~~;fWM '  
    Dim fList() As String, curFile As String }Da8S|)H  
    GetFileList( cDir, fList ) gD
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    Print "" aPcO9  
    Print "Files found for merging:" s8WA@)L  
    For Each curFile In fList hs2f
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        Print Chr(9) & curFile ]0ouJY  
    Next UrH^T;#  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. bNevHKS  
    Dim nameArray() As String, sampName As String 4oT25VH  
    nameArray = Split(fList(0)," 0-0.txt") [k@D}p x  
    sampName  = nameArray(0) A}~hc&J  
    Print "" uTbI\iq  
    Print "Sample name: " & Chr(9) & sampName +;Q&  
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    'Open an output file and write the FRED header data 6[aCjW  
    Dim outFile As String n6O1\}YB  
    outFile = cDir & sampName & "_FRED.txt" =(Mv@eA"  
    Open outFile For Output As #1 6
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    Print #1, "type bsdf_data" @2CYv>  
    Print #1, "format angles=deg bsdf=value scale=1" \ CV(c]  
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    'Loop the file list, skip the two header lines and write the remaining data to file qk~QcVg  
    Dim lineArray() As String, curLine As Long +z>*m`}F  
    For Each curFile In fList |ng[s6uf  
        Print "Merging data from file " & curFile EK@yzJ%  
        ReadFile( cDir & curFile, lineArray ) lr+Kwve  
        For curLine = 2 To UBound(lineArray) gSZNsiH  
            Print #1, lineArray(curLine) Q7"KgqpQ3  
        Next Tx/  
    Next ]=WJ%p1l  
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    'Close the output file [5)1 4% x  
    Close #1 v^[tK2&v  
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    Print "Finished merging RPC data for sample " & sampName p
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    Print "FRED formatted data file: " & Chr(9) & outFile xfkG&&  
End Sub [53@'@26  
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'Utility function to read the contents of a file into an array of strings. }YU#}Ip@  
Function ReadFile(ByVal fileName As String, _ hB P]^~(  
                  ByRef lineArray() As String) As Long NZ{kjAd3c  
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    ReadFile = -1 U6j
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    Dim oFSO As Object O
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    Set oFSO = CreateObject("Scripting.FileSystemObject") F8_pwJUpf-  
    Erase lineArray $d,30hK  
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    Dim fid As Long :Q+rEjw+  
    If oFSO.fileexists( fileName ) Then `q7I;w+g  
        fid = FreeFile() F mh;d*IT  
        Open fileName For Input As fid nLto=tNUO  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) H!Uy4L~>  
        Close fid -T4?5T_  
    End If a=p3oh?%-O  
    Set oFSO = Nothing (G#)[0<fX  
    Return UBound( lineArray ) e<~uU9 lg1  
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End Function 4{CVBowi  
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Sub GetFileList( ByVal in_dir As String, _ 0u'2f`p*  
                 ByRef in_flist() As String ) C~'}RM  
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    'Redimension the file list array >AN`L`%2  
    Erase in_flist Yi7`iC  
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    'Tracks how many files are found SQ>.P  
    Dim fCount As Long E`LML?  
    fCount = 0 swi|   
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    'Recurse directory and search for text files c#u-E6  
    Dim f As String P~ffgzP  
    f = Dir$(in_dir & "*.txt") ouVR[w>V  
    While f <> "" ,_u8y&<|I  
        ReDim Preserve in_flist(fCount) 5y}}?6n+  
        in_flist(fCount) = f {-Yp~HQF  
        fCount += 1 g3LAi#m  
        f = Dir$() b=K   
    Wend
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    ReDim Preserve in_flist(fCount-1) FK@rZP  
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End Sub l:j9lBS  
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