[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： f hQy36i@  
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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。  bH*@,EE  
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背景： 6m9 7_NRO  
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。 UqN{JG:#.  
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。 "YJ[$TG  
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步骤 NZ>7dJ  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 zI:(33)  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） aD2*.ln><  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 Yp*,Jp1  
例如下所示： {>@QJlE0  
Sample name:  EDF-C1-56 M;*$gV<x  
Merging data from file EDF-C1-56 0-0.txt R'SBd}1  
Finished merging RPC data for sample EDF-C1-56 6O9iEc,HM  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !\^jt%e&  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 {LP b))  
a. 创建一个新的散射库 IAf$]Fh  
b. 散射模型命名 ABc)2"i:*  
c. 改变散射模型为“Tabulated BSDF”. YZ+>\ x  
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 ） D9.`hs0  
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。 v dU%R\  
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， 8h|M!/&2  
g. 点击OK Sk\n;mL:  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 q +R*Hi  
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脚本代码： PL@~Ys0
  
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'#Language "WWB-COM" 9JPEj-3`g  
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Option Explicit j$Nf%V 6Y  
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Sub Main H?tUCbw  
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    'Cleanup w$j{Hp6m  
    ClearOutputWindow() x? N.WABr;  
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    Print "Merging RPC Photonics BSDF Data Files" @RGDhwS47  
    SetTextColor(255,0,0) 9_ZBV{   
    Print "Note: Script should be located in the same folder as the BSDF TXT files." >7'+ye6z  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." */w7?QOv  
    SetTextColor(0,0,0) xvmt.
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    'Current directory of this script (should be the same as the text files being merged) khx.y
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    Dim cDir As String JoZ(_Jh%m  
    cDir = MacroDir$ & "\" WC*=rWRxF  
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    'Array which will be populated with the list of files to be merged E{y1S\7K  
    Dim fList() As String, curFile As String q0&$7GH4  
    GetFileList( cDir, fList ) &|9.}Z8U  
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    Print "" 'T,c.Vj)  
    Print "Files found for merging:" dNiH|-$an  
    For Each curFile In fList RWKH%C[Yd  
        Print Chr(9) & curFile kWhr1wR1  
    Next O_;Dk W  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v.&>Ih/L
 
    Dim nameArray() As String, sampName As String -Z0+oU(?YE  
    nameArray = Split(fList(0)," 0-0.txt") n~.*1. P  
    sampName  = nameArray(0) J?&l*_m;t  
    Print "" A"uULfnk  
    Print "Sample name: " & Chr(9) & sampName "m$3)7 $  
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    'Open an output file and write the FRED header data uw AwWgl  
    Dim outFile As String =0qpVFvU  
    outFile = cDir & sampName & "_FRED.txt" Y?K{(szo ?  
    Open outFile For Output As #1 0 1V^L}  
    Print #1, "type bsdf_data" ["3\eFg  
    Print #1, "format angles=deg bsdf=value scale=1" 2;2}wM[  
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    'Loop the file list, skip the two header lines and write the remaining data to file zMi; A6  
    Dim lineArray() As String, curLine As Long LP];x3  
    For Each curFile In fList -/
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        Print "Merging data from file " & curFile @7oL#-  
        ReadFile( cDir & curFile, lineArray ) \ZI'|Ad  
        For curLine = 2 To UBound(lineArray) r'GP$0rr9!  
            Print #1, lineArray(curLine) Iu[|<C
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        Next 9?<{_'  
    Next L|hx arJ  
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    'Close the output file V~@^`Gd  
    Close #1 #V,R >0"  
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    Print "Finished merging RPC data for sample " & sampName YW/QC'_iC  
    Print "FRED formatted data file: " & Chr(9) & outFile PcT?<HU  
End Sub 9(4&KZpK  
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'Utility function to read the contents of a file into an array of strings. d5`3wd]]'v  
Function ReadFile(ByVal fileName As String, _ V)(R]BK{  
                  ByRef lineArray() As String) As Long N$>^g"6o  
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    ReadFile = -1 kF"@Ngv.  
    Dim oFSO As Object _Q[$CcDEE  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Gh.[dF?  
    Erase lineArray @.
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    Dim fid As Long aJ") <_+  
    If oFSO.fileexists( fileName ) Then *z*uEcitW  
        fid = FreeFile() :a ->0 l  
        Open fileName For Input As fid ?i
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) F8:vDv  
        Close fid }|u4 W?H  
    End If VXLT^iX  
    Set oFSO = Nothing %h?x!,q Y  
    Return UBound( lineArray ) :L44]K5FL  
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End Function #S&Tkip]"W  
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Sub GetFileList( ByVal in_dir As String, _ 2EZb )&Q  
                 ByRef in_flist() As String ) ,(8;y=wux  
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    'Redimension the file list array Bp8'pj;~  
    Erase in_flist (q+)'H%iK  
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    'Tracks how many files are found ;r_F[E2z  
    Dim fCount As Long $YN6<5R)  
    fCount = 0 r\qj!  
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    'Recurse directory and search for text files T}V!`0vKw  
    Dim f As String ]QzGE8jp*  
    f = Dir$(in_dir & "*.txt") [<DZ*|+  
    While f <> "" ]E\n9X-{  
        ReDim Preserve in_flist(fCount) P"B0_EuR<T  
        in_flist(fCount) = f Ag{iq(X  
        fCount += 1 S S2FTb-m  
        f = Dir$() ~HOy:1QhE=  
    Wend 8GvJ0Jq}U  
    ReDim Preserve in_flist(fCount-1) DxUKUE  
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End Sub sZx/Ee   
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