[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。 I :)W*SK  
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背景： \.#p_U5In  
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。 aY)2eY  
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。 <7XT\?%F  
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步骤 s-*._;  
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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。 AIRr{Y  
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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） aWy]9F&C:  
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 iqwkARG"  
例如下所示： }BJX/, H,  
Sample name:  EDF-C1-56 5$rSEVg9  
Merging data from file EDF-C1-56 0-0.txt MCc$TttaVz  
Finished merging RPC data for sample EDF-C1-56 %Dig)<yx  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt nSx]QREL!  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ^2JpWY:|7  
a. 创建一个新的散射库 q,%:h`t\  
b. 散射模型命名 hs+kr?Pg`  
c. 改变散射模型为“Tabulated BSDF”. .*YD&(  
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 ） :+rUBY
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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。 0;.<~;@h  
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， )]43R   
g. 点击OK EU-]sTJLF  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 atF?OP|{,w  
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脚本代码： {ZsdLF#  
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'#Language "WWB-COM" l2jF#<S@  
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Option Explicit I?Aj.{{$G%  
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Sub Main fJAnKUF)  
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    'Cleanup M@Q3M(z  
    ClearOutputWindow() ^W?Z  
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    Print "Merging RPC Photonics BSDF Data Files" qMYe{{r  
    SetTextColor(255,0,0) HQP}w%8x  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." fbvbz3N
 
    Print "Note: Do not run this script multiple times without deleting the output file between executions." {aYY85j  
    SetTextColor(0,0,0) ]3iH[,KU3  
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    'Current directory of this script (should be the same as the text files being merged) @A<PkpNL  
    Dim cDir As String .L6Zm U  
    cDir = MacroDir$ & "\" E:`v+S_h  
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    'Array which will be populated with the list of files to be merged >Z.\J2wM<j  
    Dim fList() As String, curFile As String c]-*P7W  
    GetFileList( cDir, fList ) q`NXJf=sc  
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    Print "" A]0:8@k5  
    Print "Files found for merging:" 3r+.N  
    For Each curFile In fList NB_)ZEmF  
        Print Chr(9) & curFile _nh[(F<hz  
    Next 4NN$( S-W  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. M=qb^~ l
 
    Dim nameArray() As String, sampName As String T:]L/wCj  
    nameArray = Split(fList(0)," 0-0.txt") u"1rF^j6k  
    sampName  = nameArray(0) :#k &\f-Y  
    Print "" B~ S6R  
    Print "Sample name: " & Chr(9) & sampName 5{e,L>H<  
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    'Open an output file and write the FRED header data ^O(=Vry  
    Dim outFile As String Isy'{-H  
    outFile = cDir & sampName & "_FRED.txt" u9+kLepOT  
    Open outFile For Output As #1 ZK;zm  
    Print #1, "type bsdf_data"
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    Print #1, "format angles=deg bsdf=value scale=1" j]|U  
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    'Loop the file list, skip the two header lines and write the remaining data to file
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    Dim lineArray() As String, curLine As Long x<Vm5j  
    For Each curFile In fList M-)RQ-h  
        Print "Merging data from file " & curFile 5tjP6Z`!9`  
        ReadFile( cDir & curFile, lineArray ) 8to8!(  
        For curLine = 2 To UBound(lineArray) zZcnijWb  
            Print #1, lineArray(curLine) D:^$4}h f  
        Next m5mu:  
    Next W[EKD 7  
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    'Close the output file bXUy9-L  
    Close #1 ~/^5) g_  
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    Print "Finished merging RPC data for sample " & sampName /~*_x=p:  
    Print "FRED formatted data file: " & Chr(9) & outFile H]4Hj  
End Sub sGh(#A0Pt  
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'Utility function to read the contents of a file into an array of strings. r
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Function ReadFile(ByVal fileName As String, _ Hbv6_H  
                  ByRef lineArray() As String) As Long WJ<^E"^  
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    ReadFile = -1 u:0aM}9A  
    Dim oFSO As Object w 4[{2  
    Set oFSO = CreateObject("Scripting.FileSystemObject") T\~x.aH`^  
    Erase lineArray `Al;vVMRO  
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    Dim fid As Long ][}0#'/mV  
    If oFSO.fileexists( fileName ) Then X7k.zlH7T  
        fid = FreeFile() l Va &"  
        Open fileName For Input As fid U9b?i$  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) BIuK @$  
        Close fid bf
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    End If L(&&26Y  
    Set oFSO = Nothing )K &(  
    Return UBound( lineArray ) McB[|PmC  
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End Function h=;{oY<V)?  
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Sub GetFileList( ByVal in_dir As String, _ tcxcup%
 
                 ByRef in_flist() As String ) 6@DF  
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    'Redimension the file list array pz"0J_xDM  
    Erase in_flist "DYJ21Ut4  
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    'Tracks how many files are found  *6q5S4 r  
    Dim fCount As Long j?'GZ d"B  
    fCount = 0 Gea\,{E9xA  
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    'Recurse directory and search for text files  SdD6 ~LS  
    Dim f As String ]+X@ 7  
    f = Dir$(in_dir & "*.txt") 0_88V  
    While f <> "" Gz.|]:1  
        ReDim Preserve in_flist(fCount) eM8}
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        in_flist(fCount) = f oq}'}`lw"  
        fCount += 1 X&kp;W  
        f = Dir$() Bve.C  
    Wend .V,@k7U,V  
    ReDim Preserve in_flist(fCount-1)
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End Sub J{Q|mD=  
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