[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： -{z[.v.p  
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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。 'dzbeTJD5  
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背景：  z.2UZ%:  
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。 M)wNu  
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。 Q.V@Sawe5  
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步骤 Ic&YiATj  
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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。 j b'M  
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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） Qn-nO_JL  
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 R{aqn0M  
例如下所示： Kg /,  
Sample name:  EDF-C1-56 $`vXI%|.  
Merging data from file EDF-C1-56 0-0.txt }&s
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Finished merging RPC data for sample EDF-C1-56 KZ65#UVX  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Gb"kl.j  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 S?D]P'<  
a. 创建一个新的散射库 V!TGFo}  
b. 散射模型命名 "^ dMCS@  
c. 改变散射模型为“Tabulated BSDF”. k{|>!(Ax  
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 ） qAlX#]  
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。 d}Y#l}!E6  
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， <RH%FhT  
g. 点击OK Zm6jF  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 od,,2pwK+  
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脚本代码： jSdC1,wR  
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'#Language "WWB-COM" d5{RIM|  
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Option Explicit 'b>3:&  

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Sub Main ).Iifu|
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    'Cleanup zt!>  
    ClearOutputWindow() >,)U46  
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    Print "Merging RPC Photonics BSDF Data Files" K>\v<!%a  
    SetTextColor(255,0,0) C9FAX$$^(Y  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." #0^a-47PA<  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." {aopGu?i  
    SetTextColor(0,0,0) q!h'rX=_-  
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    'Current directory of this script (should be the same as the text files being merged) z$/s` |]  
    Dim cDir As String J~ *>pp#U  
    cDir = MacroDir$ & "\" {8%KO1xB  
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    'Array which will be populated with the list of files to be merged 3lS1WA  
    Dim fList() As String, curFile As String =dWqB&  
    GetFileList( cDir, fList ) )! kl:  
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    Print "" ;vk>k0S  
    Print "Files found for merging:" o?#-Tkb  
    For Each curFile In fList V-63   
        Print Chr(9) & curFile $}0\sj%  
    Next #??[;xjs!  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D7jbo[GgS  
    Dim nameArray() As String, sampName As String kD((1v*D$  
    nameArray = Split(fList(0)," 0-0.txt") %qVD-Jln  
    sampName  = nameArray(0) p<FqK/  
    Print "" f]Rh<N$  
    Print "Sample name: " & Chr(9) & sampName rfh`;G5s  
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    'Open an output file and write the FRED header data * COC&  
    Dim outFile As String D|vck1C5,  
    outFile = cDir & sampName & "_FRED.txt" e%=SgXl2t  
    Open outFile For Output As #1 LGYg@DR  
    Print #1, "type bsdf_data" G//hZwf0  
    Print #1, "format angles=deg bsdf=value scale=1" \@{TF((Y  
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    'Loop the file list, skip the two header lines and write the remaining data to file hw B9N  
    Dim lineArray() As String, curLine As Long O`9vEovjs  
    For Each curFile In fList @ykl:K%ke  
        Print "Merging data from file " & curFile =W gzj|Kr  
        ReadFile( cDir & curFile, lineArray ) hSj@<#b>F  
        For curLine = 2 To UBound(lineArray) fUq #mkq}  
            Print #1, lineArray(curLine) W*u$e8i7  
        Next $+U6c~^^  
    Next
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    'Close the output file tU.~7f#+A  
    Close #1 m:9|5W  
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    Print "Finished merging RPC data for sample " & sampName 4S* X=1  
    Print "FRED formatted data file: " & Chr(9) & outFile 8 9maN  
End Sub ]r\!Z <<(  
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'Utility function to read the contents of a file into an array of strings. m mH xPd  
Function ReadFile(ByVal fileName As String, _ $OzVo&P;  
                  ByRef lineArray() As String) As Long jK{qw  
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    ReadFile = -1 4(`U]dNcs  
    Dim oFSO As Object jq_ i&~S  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 2r@9|}La  
    Erase lineArray M'pIAm1p  

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    Dim fid As Long 59X XmVg  
    If oFSO.fileexists( fileName ) Then vm=d?*cR  
        fid = FreeFile() tLP Er@  
        Open fileName For Input As fid 0~Xt_rN](  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) y#/P||PM  
        Close fid +$#h6V  
    End If "EZpTy}Ee  
    Set oFSO = Nothing Ieh<|O,-C  
    Return UBound( lineArray ) xO4""/
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End Function HNLr} Yj  
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Sub GetFileList( ByVal in_dir As String, _ mH)8A+us  
                 ByRef in_flist() As String ) UMK9[Iy$<M  
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    'Redimension the file list array xZVZYvC,t  
    Erase in_flist #@E:|^$1y  
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    'Tracks how many files are found tHr4/  
    Dim fCount As Long VKSn \HT~  
    fCount = 0 x4v&%d=M  
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    'Recurse directory and search for text files dt/-0~U  
    Dim f As String B)dG:~  
    f = Dir$(in_dir & "*.txt") 8=g~+<A  
    While f <> "" & s:\tL  
        ReDim Preserve in_flist(fCount) Y3SV6""y/  
        in_flist(fCount) = f $v5 >6+-n  
        fCount += 1 S#Tu/2<}  
        f = Dir$() |<uBJ-5  
    Wend :`uu[^  
    ReDim Preserve in_flist(fCount-1) JkKbw&65  
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End Sub tqjjn5!  
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