[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： WGo ryvEx  
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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。 ob/HO(h3  
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背景： \aN5:Yy  
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。 waG &3m  
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。 mS.!lkV  
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步骤 Y 2^y73&k  
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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。 Djf~8q V!  
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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） ObataUxQT  
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 \2Kl]G(w%y  
例如下所示： yKmHTjX=  
Sample name:  EDF-C1-56 GT3}'`f B  
Merging data from file EDF-C1-56 0-0.txt tq*{Hil>P`  
Finished merging RPC data for sample EDF-C1-56 9gZS)MZ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .:(gg  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 VotI5O $  
a. 创建一个新的散射库 buHUBn[3)  
b. 散射模型命名 =wa5\p/  
c. 改变散射模型为“Tabulated BSDF”. Rb <{o8  
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 ） 5!6}g<z&L  
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。 @s\}ER3  
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， >_X(rar0  
g. 点击OK }-&#vP~I  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ~\zIb/ #  
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脚本代码： t2qWB[r  
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'#Language "WWB-COM" 1+-F3ROP  
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Option Explicit x o72JJ  
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Sub Main
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    'Cleanup 5zt5]zl'  
    ClearOutputWindow() h5))D!  
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    Print "Merging RPC Photonics BSDF Data Files" pf0uwXo  
    SetTextColor(255,0,0) P?y{9H*  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." u#Uc6? E  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." >*}m.'u  
    SetTextColor(0,0,0) o7g6*hJz  
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    'Current directory of this script (should be the same as the text files being merged) [wJl]i  
    Dim cDir As String TJs@V>,  
    cDir = MacroDir$ & "\" U9RpHh`  
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    'Array which will be populated with the list of files to be merged q,j` _ R
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    Dim fList() As String, curFile As String VF9-&HuC  
    GetFileList( cDir, fList ) |>nVp:t^  
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    Print "" zrur-i$N+  
    Print "Files found for merging:" zx5t gZd,N  
    For Each curFile In fList 9K{0x7~  
        Print Chr(9) & curFile 8V:yOq10  
    Next +@#-S  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kC+dQ&@g{  
    Dim nameArray() As String, sampName As String
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    nameArray = Split(fList(0)," 0-0.txt") ]&L[]  
    sampName  = nameArray(0) [m]O^Hp{{  
    Print "" 7me1:}4  
    Print "Sample name: " & Chr(9) & sampName .fS1  
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    'Open an output file and write the FRED header data \"A~ks~  
    Dim outFile As String f@IL2DL}\  
    outFile = cDir & sampName & "_FRED.txt" D5 ^WiQ<  
    Open outFile For Output As #1 ]F,v#6qi  
    Print #1, "type bsdf_data" YZ+<+`Mz<  
    Print #1, "format angles=deg bsdf=value scale=1" &v_b7h  
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    'Loop the file list, skip the two header lines and write the remaining data to file TM$`J  
    Dim lineArray() As String, curLine As Long +JL"Z4b@R}  
    For Each curFile In fList n15lX,FI  
        Print "Merging data from file " & curFile wB0ONH[  
        ReadFile( cDir & curFile, lineArray ) %g%#=a;]q  
        For curLine = 2 To UBound(lineArray) Yy8%vDdJO  
            Print #1, lineArray(curLine) A*hc w  
        Next {2%@I~US  
    Next _6Fj&mw(u  
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    'Close the output file ?gOZY\[ma  
    Close #1 GvT'v0
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    Print "Finished merging RPC data for sample " & sampName ]#x?[F  
    Print "FRED formatted data file: " & Chr(9) & outFile cwA+?:Ry}  
End Sub [z`m`9Aq  
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'Utility function to read the contents of a file into an array of strings. u-E*_%y  
Function ReadFile(ByVal fileName As String, _ b7bbrR8  
                  ByRef lineArray() As String) As Long NFcMh+qnK  
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    ReadFile = -1 ^ $t7p 1  
    Dim oFSO As Object "5R8Zl+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") `ynD-_fTN  
    Erase lineArray /8w _jjW  
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    Dim fid As Long .pQ4#AJ  
    If oFSO.fileexists( fileName ) Then &U8W(NxN  
        fid = FreeFile() YWPAc>uw,  
        Open fileName For Input As fid `$D2w|  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9*}?0J8  
        Close fid S_B;m1  
    End If k
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    Set oFSO = Nothing -?WhJ.U  
    Return UBound( lineArray ) #b4Pn`[  
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End Function =<,
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Sub GetFileList( ByVal in_dir As String, _ QeVM9br)m  
                 ByRef in_flist() As String ) $=GZ
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    'Redimension the file list array vxzOG?Xc:  
    Erase in_flist QNH5Cq;Y  
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    'Tracks how many files are found EV 8}C=  
    Dim fCount As Long v/BMzVi  
    fCount = 0 lT3,G#(  
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    'Recurse directory and search for text files @^$Xy<x  
    Dim f As String *a7&v3X  
    f = Dir$(in_dir & "*.txt") sCFqz[I  
    While f <> "" 3%<xM/#  
        ReDim Preserve in_flist(fCount) 7usf^g[dh  
        in_flist(fCount) = f `}^_>  
        fCount += 1 <Vk^fV  
        f = Dir$() b_]14 v  
    Wend l1\/ `  
    ReDim Preserve in_flist(fCount-1) dkC[
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End Sub }w&+H28.#  
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