[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 OZ4%6/  
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背景： ?*:BgaR_  
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+/BYN!&4  
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。 BHpj_LB-P  
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步骤 o'=i$Eb  

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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。 <q:2' 4o  
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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） $k^& X `  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ^&\<[\  
例如下所示： LfMN 'Cb  
Sample name:  EDF-C1-56 8gW$\  
Merging data from file EDF-C1-56 0-0.txt zU";\);  
Finished merging RPC data for sample EDF-C1-56 +\RviF[+  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt VLC=>w\,  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 q3ebps9^  
a. 创建一个新的散射库 l}W"> yQ0  
b. 散射模型命名 E&0]s  
c. 改变散射模型为“Tabulated BSDF”. vu3zZMl  
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 ） :.crES7<[X  
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。 &:#"APX  
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， TRFza}4:i  
g. 点击OK ,"Nb;Yhg  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 wp<f{^ et  
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脚本代码： `gdk,L]  
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'#Language "WWB-COM" @Uqcym.  
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Option Explicit K Vnz{cx`  
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Sub Main $u, ~183  
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    'Cleanup LT:8/&\  
    ClearOutputWindow() 9j<7KSj  
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    Print "Merging RPC Photonics BSDF Data Files" 5 ~YaXh^  
    SetTextColor(255,0,0) i}~U/.P   
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ><{Lh@{  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." c.uD%  
    SetTextColor(0,0,0) Z@bKYfGM  
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    'Current directory of this script (should be the same as the text files being merged) uXVs<im  
    Dim cDir As String y|(?>\jBl  
    cDir = MacroDir$ & "\" %)=c#H1  
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    'Array which will be populated with the list of files to be merged O7yIFqI=/  
    Dim fList() As String, curFile As String yK w.69.  
    GetFileList( cDir, fList ) Dj{=Y`Tw  
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    Print "" mBDzc(_\$'  
    Print "Files found for merging:"  \1?:  
    For Each curFile In fList @|fT%Rwho<  
        Print Chr(9) & curFile 4)d"}j  
    Next FLQ>,=O  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )odz/\9n3c  
    Dim nameArray() As String, sampName As String R?8/qGSVqJ  
    nameArray = Split(fList(0)," 0-0.txt") K5 Z'kkOk  
    sampName  = nameArray(0) lGX8kAv?  
    Print "" DS=Dg@y  
    Print "Sample name: " & Chr(9) & sampName a[RqK#  
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    'Open an output file and write the FRED header data )pw53,7>aN  
    Dim outFile As String ?, cI!c`  
    outFile = cDir & sampName & "_FRED.txt" GhW{6.^  
    Open outFile For Output As #1 &W N R{  
    Print #1, "type bsdf_data" gCM(h[7A  
    Print #1, "format angles=deg bsdf=value scale=1" }M &hcw<  
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    'Loop the file list, skip the two header lines and write the remaining data to file |qtZb}"|  
    Dim lineArray() As String, curLine As Long 2 P9{?Y  
    For Each curFile In fList A3Y}|7QA  
        Print "Merging data from file " & curFile 2 5Ia  
        ReadFile( cDir & curFile, lineArray ) >(a[b@[K  
        For curLine = 2 To UBound(lineArray) tTPjCl  
            Print #1, lineArray(curLine) g]U!]  
        Next goc"+K  
    Next +g%
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    'Close the output file S{zl<>+  
    Close #1 hc]5f3Z  
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    Print "Finished merging RPC data for sample " & sampName +kT o$_Wkz  
    Print "FRED formatted data file: " & Chr(9) & outFile r_3=+  
End Sub x_#'6H\1ga  
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'Utility function to read the contents of a file into an array of strings. eKL3Y_5p@  
Function ReadFile(ByVal fileName As String, _ >/y+;<MZ  
                  ByRef lineArray() As String) As Long :{~TG]4M  
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    ReadFile = -1 w s7LDY&(  
    Dim oFSO As Object jWh}cM=  
    Set oFSO = CreateObject("Scripting.FileSystemObject") d2*uY.,  
    Erase lineArray 0-8'.C1v  
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    Dim fid As Long $i$Z+-W4'  
    If oFSO.fileexists( fileName ) Then ,zh4oX`>  
        fid = FreeFile() $%"~.L4  
        Open fileName For Input As fid y-o54e$4Cq  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) VP:9&?>G  
        Close fid -\M;bQV[C  
    End If r8Z} mvLM  
    Set oFSO = Nothing (BY5omlh  
    Return UBound( lineArray ) {r1}ACw{  
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End Function 'E%+ O  
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Sub GetFileList( ByVal in_dir As String, _ =
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                 ByRef in_flist() As String ) M(<.f
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    'Redimension the file list array 8Oo16LPD  
    Erase in_flist ?9;r|G  
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    'Tracks how many files are found 1^y^b{  
    Dim fCount As Long Kl w9  
    fCount = 0  +D|E8sz8  
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    'Recurse directory and search for text files b!z kQ?h  
    Dim f As String BS+=*3J  
    f = Dir$(in_dir & "*.txt") fk(h*L|sI  
    While f <> "" X!f` !tZ:{  
        ReDim Preserve in_flist(fCount) WS1#i\0  
        in_flist(fCount) = f xRm~a-rp  
        fCount += 1 a fUOIM  
        f = Dir$() F+?g0w['  
    Wend 4_h?E:sBb  
    ReDim Preserve in_flist(fCount-1) `r*bG=  
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End Sub OLyl.#J  
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