[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： #8WR{  
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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。 RBHqLg(  
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背景： (STWAwK-  
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+{nw}e8  
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。 hx2!YNx !  
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步骤 &T|UAM.  
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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。 QWIOim-  
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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） ~Krg8s!F&  
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 iNaC ZC  
例如下所示： b(.o|d/P  
Sample name:  EDF-C1-56 :\ON+LQr  
Merging data from file EDF-C1-56 0-0.txt d-K5nRyI  
Finished merging RPC data for sample EDF-C1-56 f;qKrw  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt =*U%j  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 oM? C62g\  
a. 创建一个新的散射库 O!@KM;  
b. 散射模型命名 #L
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c. 改变散射模型为“Tabulated BSDF”. E<fwl1<88  
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 ） &_Xv:?  
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。 'f$?/5@@  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， - KoA[
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g. 点击OK G~mB=]  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 } cH"lppX  
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脚本代码： |Jx2"0:M  
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'#Language "WWB-COM" EJSgTtp2  
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Option Explicit MHzsxF|  
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Sub Main 28ov+s~1+-  
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    'Cleanup c)P%O  
    ClearOutputWindow() +~v3D^L15  
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    Print "Merging RPC Photonics BSDF Data Files" /`]|_>'  
    SetTextColor(255,0,0) ]Rys=.!  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :_b =Km<  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L"zgBB?K6  
    SetTextColor(0,0,0) D;;o  
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    'Current directory of this script (should be the same as the text files being merged) H1c|b!C  
    Dim cDir As String 2K7:gd8Ru  
    cDir = MacroDir$ & "\" '/]Aaf@U8  
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    'Array which will be populated with the list of files to be merged sMe~C>RD  
    Dim fList() As String, curFile As String `OpC-Z&  
    GetFileList( cDir, fList ) AK\g-]8  
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    Print "" :?of./Df|  
    Print "Files found for merging:" nQ(:7PFa'  
    For Each curFile In fList ->#@rF:S  
        Print Chr(9) & curFile Fn0LE~O}-8  
    Next o\V4qekk  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sMpC4E  
    Dim nameArray() As String, sampName As String .$E~.6J %i  
    nameArray = Split(fList(0)," 0-0.txt") |$*9j""u  
    sampName  = nameArray(0) p]IhQnj2  
    Print "" K&~#@I;  
    Print "Sample name: " & Chr(9) & sampName >j
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    'Open an output file and write the FRED header data u$`x]K=Zsm  
    Dim outFile As String ^V;lZtZ  
    outFile = cDir & sampName & "_FRED.txt" U JRT4>G  
    Open outFile For Output As #1 ng)yCa_Ny  
    Print #1, "type bsdf_data" x6cl(J}  
    Print #1, "format angles=deg bsdf=value scale=1" Env}gCX  
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    'Loop the file list, skip the two header lines and write the remaining data to file KVe'2Q<  
    Dim lineArray() As String, curLine As Long BE@H~<E J  
    For Each curFile In fList 3<Y;mA=hw  
        Print "Merging data from file " & curFile \\pyu]z  
        ReadFile( cDir & curFile, lineArray ) u2Z^iY  
        For curLine = 2 To UBound(lineArray) [tw<TV"\  
            Print #1, lineArray(curLine) ENF@6]  
        Next 9%'HB\A  
    Next thboHPml{  
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    'Close the output file 4!RI2?4V  
    Close #1 ,OFr]74\  
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    Print "Finished merging RPC data for sample " & sampName -2u+m  
    Print "FRED formatted data file: " & Chr(9) & outFile K`Zb;R X  
End Sub \}Kp=8@nE  
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'Utility function to read the contents of a file into an array of strings. RloPP  
Function ReadFile(ByVal fileName As String, _ AS-t][m#  
                  ByRef lineArray() As String) As Long >" 8j{s  
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    ReadFile = -1 G:s:NXy^  
    Dim oFSO As Object ?'_7#0R_0  
    Set oFSO = CreateObject("Scripting.FileSystemObject") *LQY6=H  
    Erase lineArray |>V>6%>vK6  
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    Dim fid As Long o5A_j?t  
    If oFSO.fileexists( fileName ) Then lNPbU ~k  
        fid = FreeFile() 9&FV=}MO  
        Open fileName For Input As fid I*ni)Px  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Wb(0Szk;  
        Close fid {Ag}P0%'  
    End If ~ab_+%  
    Set oFSO = Nothing oYM3$.{E  
    Return UBound( lineArray ) SJr:  
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End Function zt%Fvn4/pF  
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Sub GetFileList( ByVal in_dir As String, _ 6?x{-Zj^?  
                 ByRef in_flist() As String ) lR3^&d72?  
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    'Redimension the file list array [|Pe'?zkf  
    Erase in_flist +Y[+2=lO  
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    'Tracks how many files are found p&27|1pZm  
    Dim fCount As Long !\ukb  
    fCount = 0 -+Dvyr  
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    'Recurse directory and search for text files AWNd(B2o  
    Dim f As String bj^m<}   
    f = Dir$(in_dir & "*.txt") p~co!d.q/}  
    While f <> "" n?tAa|_  
        ReDim Preserve in_flist(fCount) z1 px^#  
        in_flist(fCount) = f 8dB~09Z7  
        fCount += 1 za/#R_%p  
        f = Dir$() c'qM$KN9G  
    Wend Br!&Y9  
    ReDim Preserve in_flist(fCount-1) }w8AnaC  
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End Sub !AHm+C_=Lg  
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