[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： QD3tM5(Yr  
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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。 yZ[g2*1L  
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背景： h/|p`MP\1  
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。 6@8t>"}  
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。 [mjie1j/<  
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步骤 R{bG`C8.d  
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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。 1,;zX^  
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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） jZkc yx  
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 ojlyW})$%  
例如下所示： 2YKa <?_  
Sample name:  EDF-C1-56 `?N0?;  
Merging data from file EDF-C1-56 0-0.txt dTK0lgkUE  
Finished merging RPC data for sample EDF-C1-56 P[G>uA>Z1  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @j}%{Km]Y  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Ky%lu^  
a. 创建一个新的散射库 J+E,UiZU  
b. 散射模型命名 O8bxd6xb  
c. 改变散射模型为“Tabulated BSDF”. EV{Ys}3M  
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 ） [H<TcT8  
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。 kUS]g r~i  
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， U7D!w$4  
g. 点击OK 0&]
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 h,m 90Hd+  
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脚本代码： fM"*;LN!N  
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'#Language "WWB-COM" \298SH(!7  
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Option Explicit \|{/
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Sub Main \z0HHCn'"  
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    'Cleanup |0=UZK7%O  
    ClearOutputWindow() 1\&j)3mC  
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    Print "Merging RPC Photonics BSDF Data Files" kc^,V|Nbq6  
    SetTextColor(255,0,0) 3)W zX  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." z.SC^/\o|  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." "hf |7E_  
    SetTextColor(0,0,0) w(6n  
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    'Current directory of this script (should be the same as the text files being merged) %?PFe}
 
    Dim cDir As String E(PBV  
    cDir = MacroDir$ & "\" 87 s*lS  
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    'Array which will be populated with the list of files to be merged g5@g_~ g  
    Dim fList() As String, curFile As String R03 Te gwA  
    GetFileList( cDir, fList ) :HO5 T  
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    Print "" =,(TP  
    Print "Files found for merging:" ~x9]?T  
    For Each curFile In fList a9.yuSzL  
        Print Chr(9) & curFile ?FAI@
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    Next erUYR"  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kJ_8|  
    Dim nameArray() As String, sampName As String rKrHd  
    nameArray = Split(fList(0)," 0-0.txt") 3O/#^~\'hW  
    sampName  = nameArray(0) 7pyzPc#_  
    Print "" 3OZPy|".ax  
    Print "Sample name: " & Chr(9) & sampName pZ.b X  
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    'Open an output file and write the FRED header data {?H5Pw>{%h  
    Dim outFile As String hL&$` Q  
    outFile = cDir & sampName & "_FRED.txt" 9RJF  
    Open outFile For Output As #1 W#p7M[  
    Print #1, "type bsdf_data" Kp`{-dUf  
    Print #1, "format angles=deg bsdf=value scale=1" H&)}Z6C"  
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    'Loop the file list, skip the two header lines and write the remaining data to file L"m^LyU  
    Dim lineArray() As String, curLine As Long IW0S*mO$  
    For Each curFile In fList yWi-ic [n  
        Print "Merging data from file " & curFile 43P
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        ReadFile( cDir & curFile, lineArray ) GXtK3YAr  
        For curLine = 2 To UBound(lineArray) "o&8\KSs  
            Print #1, lineArray(curLine) <(xqw<)  
        Next SMX]JZmH  
    Next r=H?fTY<3E  
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    'Close the output file .S/5kLul  
    Close #1 <+QQiFj  
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    Print "Finished merging RPC data for sample " & sampName Ktq4b%{  
    Print "FRED formatted data file: " & Chr(9) & outFile ??,[-Oi  
End Sub s<s}6|Z  
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'Utility function to read the contents of a file into an array of strings. V*giF`gq  
Function ReadFile(ByVal fileName As String, _ 0[MYQl`  
                  ByRef lineArray() As String) As Long "b} mVrFh  
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    ReadFile = -1 $Nu{c;7"  
    Dim oFSO As Object uuC [
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    Set oFSO = CreateObject("Scripting.FileSystemObject") tVAi0`DV  
    Erase lineArray  w4U,7%V  
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    Dim fid As Long zjpZ] $  
    If oFSO.fileexists( fileName ) Then 3p0v  
        fid = FreeFile() xb,XI/
 
        Open fileName For Input As fid yLnQ9BXB&  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) -s3`mc}*  
        Close fid }L\;W:0  
    End If {R}F4k  
    Set oFSO = Nothing P.Z:`P)  
    Return UBound( lineArray ) hNN>Pd~;  
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End Function ?jmP]MM  
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Sub GetFileList( ByVal in_dir As String, _ 3UZd_?JI[^  
                 ByRef in_flist() As String ) uX_H;,n  
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    'Redimension the file list array M/N8bIC! Q  
    Erase in_flist v:t;Uk^Y  
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    'Tracks how many files are found D:z'`v0j  
    Dim fCount As Long ^A$=6=CX  
    fCount = 0 {^N,=m\  
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    'Recurse directory and search for text files ?I}RX~Tgg  
    Dim f As String m2PUU/8B/  
    f = Dir$(in_dir & "*.txt") Q{[@n  
    While f <> "" 'nCVjO7o  
        ReDim Preserve in_flist(fCount) m'rDoly"62  
        in_flist(fCount) = f =zkN63S  
        fCount += 1 c1#0o)q*7  
        f = Dir$() s L^+$Mq6  
    Wend ,!#Am13  
    ReDim Preserve in_flist(fCount-1) 'C]w3Rh'  
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End Sub V]7/hN-Y}  
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