[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： V]I:2k5  
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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。 0HGlf  
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背景： j$3rJA%rN  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 ~I{EE[F>qL  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 2 ;JQX!  
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步骤 |u@+`4o  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 "(s6aqO$  
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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） '.?^uM  
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 9<yAQ?7L  
例如下所示： )uZoH8?  
Sample name:  EDF-C1-56 f|OI`  
Merging data from file EDF-C1-56 0-0.txt EXuLSzQwv  
Finished merging RPC data for sample EDF-C1-56 1N8;)HLIBJ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *HR+a#o  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 l , ..5   
a. 创建一个新的散射库 {fZb@7?GF  
b. 散射模型命名
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c. 改变散射模型为“Tabulated BSDF”. #~L!pKM  
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 ） R (G2qi  
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。 |,b2b2v?  
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， "'m)VG  
g. 点击OK $9K(F~/  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 )zU:  
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脚本代码： $.pTB(tO  
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'#Language "WWB-COM" x?#I4RJH;  
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Option Explicit bNGCOj  
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Sub Main U@'F%nH
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    'Cleanup 'BY-OA#xJ  
    ClearOutputWindow() F$Hx`hoy  
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    Print "Merging RPC Photonics BSDF Data Files" H3, ut  
    SetTextColor(255,0,0) 8'A72*dhX  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." afHaB/t{R  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." (9 sIA*,}  
    SetTextColor(0,0,0) <:&de8bT  
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    'Current directory of this script (should be the same as the text files being merged) ?c]n^GvG  
    Dim cDir As String 5,1{Tv`  
    cDir = MacroDir$ & "\" _T5)n=|  
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    'Array which will be populated with the list of files to be merged Tk*w3c"$  
    Dim fList() As String, curFile As String F30 ]  
    GetFileList( cDir, fList ) E V2 )  
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    Print ""
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    Print "Files found for merging:" %y&]'A  
    For Each curFile In fList o:"anHs  
        Print Chr(9) & curFile j(eFoZz,  
    Next j?6X1cMq  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. er2cQS7R  
    Dim nameArray() As String, sampName As String 06 i;T~Y  
    nameArray = Split(fList(0)," 0-0.txt") \}5p0.=  
    sampName  = nameArray(0) `pL^}_>|GM  
    Print "" >xqM5#m`E$  
    Print "Sample name: " & Chr(9) & sampName m}3gZu]  
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    'Open an output file and write the FRED header data `]=oo%(h  
    Dim outFile As String \L # INP4~  
    outFile = cDir & sampName & "_FRED.txt" t9^A(Vh"-  
    Open outFile For Output As #1 AQss4[\Dx  
    Print #1, "type bsdf_data" P:C2G(V1AR  
    Print #1, "format angles=deg bsdf=value scale=1" AVl~{k|  
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    'Loop the file list, skip the two header lines and write the remaining data to file $g10vF3  
    Dim lineArray() As String, curLine As Long L?5f+@0.  
    For Each curFile In fList + H_WlYg-  
        Print "Merging data from file " & curFile 3QXjD/h  
        ReadFile( cDir & curFile, lineArray ) OtTBErQNF  
        For curLine = 2 To UBound(lineArray) 2;$k(x]  
            Print #1, lineArray(curLine) R"AUSO|{  
        Next nXA\|c0  
    Next egk7O4zwP  
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    'Close the output file C/=XuKE-
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    Close #1 'zZcn" +!  
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    Print "Finished merging RPC data for sample " & sampName 
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    Print "FRED formatted data file: " & Chr(9) & outFile i3VW1~.8  
End Sub 1LnyWZ  
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'Utility function to read the contents of a file into an array of strings. DgHaOAdU  
Function ReadFile(ByVal fileName As String, _ p\p\q(S">  
                  ByRef lineArray() As String) As Long Q`%R
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    ReadFile = -1 IA

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    Dim oFSO As Object k]A8% z  
    Set oFSO = CreateObject("Scripting.FileSystemObject") L';MP^  
    Erase lineArray c{+AJ8  
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    Dim fid As Long 3+Qxg+<  
    If oFSO.fileexists( fileName ) Then -r7]S  
        fid = FreeFile() dXHB#  
        Open fileName For Input As fid laKuOx}  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) E Y<8B3y  
        Close fid ~EzaC?fQ  
    End If LQY
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    Set oFSO = Nothing h}`!(K^;3  
    Return UBound( lineArray ) |RkcDrB~  
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End Function MPgS!V1  
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Sub GetFileList( ByVal in_dir As String, _ %V`F!D<D  
                 ByRef in_flist() As String ) y&m0Lz53Z  
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    'Redimension the file list array WE6a'  
    Erase in_flist #oeG!<Mn  
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    'Tracks how many files are found Ys+OB*8AE  
    Dim fCount As Long wxg^Bq)D*R  
    fCount = 0 M 3 '$[  
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    'Recurse directory and search for text files "@A![iP  
    Dim f As String j(:I7%3&(*  
    f = Dir$(in_dir & "*.txt") ^N}Wnk7ks'  
    While f <> "" "gtHTqheH  
        ReDim Preserve in_flist(fCount) K;hh&sTB  
        in_flist(fCount) = f aNn"X y\ k  
        fCount += 1 M->*{D@a  
        f = Dir$() 0Sq][W
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    Wend 9Jf)!o8  
    ReDim Preserve in_flist(fCount-1) aprm0:Q^  
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End Sub u]NZ`t%AP  
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