[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： OPLl*bnf  
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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。 C[0MA ,^  
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背景： g/B\ObY  
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。 L6xB`E9  
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。 -)>(8f  
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步骤 n{$}#NdV  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 wBE7Bv45  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） WV@X@]U  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 l-
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例如下所示： 1y~L8!:L  
Sample name:  EDF-C1-56 7|{ B#  
Merging data from file EDF-C1-56 0-0.txt uct=i1+ fE  
Finished merging RPC data for sample EDF-C1-56 ?0uOR*y'  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt T:6K?$y?  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /Bh>  
a. 创建一个新的散射库 3jXR"@Z-  
b. 散射模型命名 ]d^k4 d  
c. 改变散射模型为“Tabulated BSDF”. \Vz,wy%-  
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 ） pbPz$Y  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 *h:D|4oJ(  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 7oD y7nV4  
g. 点击OK *|^,DGfQ6  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ;*nh=w  
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脚本代码： C/bxfp{?  
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'#Language "WWB-COM" H<$pHyxU  
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Option Explicit Etw~*  
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Sub Main ed=n``P~}  
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    'Cleanup ^u3*hl}YKy  
    ClearOutputWindow() J0Jr BXCh  
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    Print "Merging RPC Photonics BSDF Data Files" p?}f|mQS)  
    SetTextColor(255,0,0) uL bp.N8  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." zf`5>h|  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." j{)fC]8H  
    SetTextColor(0,0,0) 1>hb-OMX  
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    'Current directory of this script (should be the same as the text files being merged) :,jPNuOA  
    Dim cDir As String .#"1bRWpZ  
    cDir = MacroDir$ & "\" -!@H["  
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    'Array which will be populated with the list of files to be merged dr.**fGYde  
    Dim fList() As String, curFile As String 5QKRI)XpZ  
    GetFileList( cDir, fList ) d8rBu jT  
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    Print "" *U:VM'a  
    Print "Files found for merging:" F ~*zC`>Y  
    For Each curFile In fList aXQ&@BZ{j  
        Print Chr(9) & curFile ?Y%}(3y  
    Next %B[YtWqm`/  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @8QFP3\1  
    Dim nameArray() As String, sampName As String d:A\<F  
    nameArray = Split(fList(0)," 0-0.txt") d
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    sampName  = nameArray(0) Um/CR!
 
    Print "" >9 q]>fJ  
    Print "Sample name: " & Chr(9) & sampName bh{E&1sLh  
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    'Open an output file and write the FRED header data qi(&8in  
    Dim outFile As String 2=jd;2~  
    outFile = cDir & sampName & "_FRED.txt"
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    Open outFile For Output As #1 T@B"BoKU  
    Print #1, "type bsdf_data" f;e_04K  
    Print #1, "format angles=deg bsdf=value scale=1" MKV=m8G=  
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    'Loop the file list, skip the two header lines and write the remaining data to file ~o:rM/!Ba  
    Dim lineArray() As String, curLine As Long >/(i3)  
    For Each curFile In fList eVJ= .?r  
        Print "Merging data from file " & curFile O5g}2  
        ReadFile( cDir & curFile, lineArray ) J>><o:~@  
        For curLine = 2 To UBound(lineArray) !>CE(;E>z  
            Print #1, lineArray(curLine) 2O?Vr" A  
        Next /7c2OI=\  
    Next >_rzT9gX&  
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    'Close the output file  fn4=  
    Close #1 -0{T
 
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    Print "Finished merging RPC data for sample " & sampName QIR4<]/  
    Print "FRED formatted data file: " & Chr(9) & outFile {CW1t5$*  
End Sub ,Y`'myL8W  
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'Utility function to read the contents of a file into an array of strings. pGO|~:E/L  
Function ReadFile(ByVal fileName As String, _ Mi;}.K0J  
                  ByRef lineArray() As String) As Long /p[|DJoM  
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    ReadFile = -1 NYWG#4D  
    Dim oFSO As Object 6XQ*:N/4al  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |Dl*w/n  
    Erase lineArray !S
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    Dim fid As Long KC&H*  
    If oFSO.fileexists( fileName ) Then ;n%]*v  
        fid = FreeFile() it(LphB8  
        Open fileName For Input As fid JoZqLy!@
 
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) lt@  
        Close fid _
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    End If LEYWH%y  
    Set oFSO = Nothing `'z(--J}`  
    Return UBound( lineArray ) *ah>-}-  
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End Function QH@Q\ @,  
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Sub GetFileList( ByVal in_dir As String, _ k! J4Z${k  
                 ByRef in_flist() As String ) TYs+XJ'Xj  
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    'Redimension the file list array XkMs
  
    Erase in_flist }"F ?H:\  
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    'Tracks how many files are found +)/Rql(lY  
    Dim fCount As Long ovhC42i  
    fCount = 0 qZT 4+&y  
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    'Recurse directory and search for text files /#S4espE  
    Dim f As String ,Y+r<;  
    f = Dir$(in_dir & "*.txt")  ET >S  
    While f <> "" D6&mf2'u  
        ReDim Preserve in_flist(fCount) b*I&k":  
        in_flist(fCount) = f t_[M&  
        fCount += 1 [}W^
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        f = Dir$() @-)<|orU4  
    Wend h(C#\{V  
    ReDim Preserve in_flist(fCount-1) 0EL\Hd   
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End Sub viW~'}^k7  
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