[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： aDlp>p^E>  
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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。 G0FzXtu)q  
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背景： e`*}?N4d  
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。 XLh)$rZ  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Y&|Z*s+ +}  
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步骤 ~.a"jYb7A}  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 ffKgVQux  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 2"/MM2s  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 OL'Ito  
例如下所示： D9rQ%|}S  
Sample name:  EDF-C1-56 h~dQ5%  
Merging data from file EDF-C1-56 0-0.txt n#_B4UqW%  
Finished merging RPC data for sample EDF-C1-56 hpdI5  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8|&,JdT  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 d^=BXCoC  
a. 创建一个新的散射库 ,H7X_KbFD4  
b. 散射模型命名 2.qPMqH  
c. 改变散射模型为“Tabulated BSDF”. C6+ 5G-Z  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） P^Hgm  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。
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f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， Mf5
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g. 点击OK 1" '3/MFQ8  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 VQ
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脚本代码： mh+T!v$[n)  
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'#Language "WWB-COM" Ii
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Option Explicit <JPN< Kv  
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Sub Main `kKssU<  
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    'Cleanup `Fqth^RK?p  
    ClearOutputWindow() 5(;Y&?k  
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    Print "Merging RPC Photonics BSDF Data Files" .
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    SetTextColor(255,0,0) pyEQb#  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." EEe$A?a;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." %0\@\fC41  
    SetTextColor(0,0,0) Bc>j5^)8w  
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    'Current directory of this script (should be the same as the text files being merged) kUBE+a6#  
    Dim cDir As String l5z//E}W  
    cDir = MacroDir$ & "\" RhYe=Qh4{p  
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    'Array which will be populated with the list of files to be merged GrF4*I`q  
    Dim fList() As String, curFile As String Y1r$;;sH  
    GetFileList( cDir, fList ) QE 4  
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    Print "" E|pT6  
    Print "Files found for merging:" T!/o^0w  
    For Each curFile In fList A%w9Da?B  
        Print Chr(9) & curFile ,fjY|ip  
    Next QO@86{u#Y  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Iv6 lE:)  
    Dim nameArray() As String, sampName As String (Cr  
    nameArray = Split(fList(0)," 0-0.txt") YNr5*P1  
    sampName  = nameArray(0) @&T' h}|:  
    Print "" wd:Yy  
    Print "Sample name: " & Chr(9) & sampName nDi^s{  
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    'Open an output file and write the FRED header data , ['}9:f9  
    Dim outFile As String hcVu`Bn  
    outFile = cDir & sampName & "_FRED.txt" 2V~E <K-  
    Open outFile For Output As #1 8W3zrnc  
    Print #1, "type bsdf_data" B*/!s7c.  
    Print #1, "format angles=deg bsdf=value scale=1" :'h$]p%  
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    'Loop the file list, skip the two header lines and write the remaining data to file  \? /'
 
    Dim lineArray() As String, curLine As Long @9^OHRZX  
    For Each curFile In fList ~[=<Os  
        Print "Merging data from file " & curFile tSy 9v  
        ReadFile( cDir & curFile, lineArray ) bQD8#Ml1  
        For curLine = 2 To UBound(lineArray) zJ
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            Print #1, lineArray(curLine) /xX7:U b  
        Next nbxY'`8F  
    Next Wvl~|Sx]  
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    'Close the output file {@X>!]  
    Close #1 ByY^d#oE  
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    Print "Finished merging RPC data for sample " & sampName \.2i?<BC  
    Print "FRED formatted data file: " & Chr(9) & outFile izSX  
End Sub R_!'=0}V  
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'Utility function to read the contents of a file into an array of strings. %P}H3;2  
Function ReadFile(ByVal fileName As String, _ ~q`f@I  
                  ByRef lineArray() As String) As Long ^cZ< .d2  
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    ReadFile = -1 ,X!)zAmm  
    Dim oFSO As Object cs6oD!h  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ;gBR~W  
    Erase lineArray a!R*O3  
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    Dim fid As Long a&{Y~Og?%  
    If oFSO.fileexists( fileName ) Then 1;[KBYUH  
        fid = FreeFile() b |:Y3_>  
        Open fileName For Input As fid (uX?XX^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) VL)<u"d4  
        Close fid -sJ1q^;f@  
    End If =]%,&Se  
    Set oFSO = Nothing et5lfj  
    Return UBound( lineArray ) 7R:j^"I@  
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End Function =r+K2]z,L  
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Sub GetFileList( ByVal in_dir As String, _ <ll?rPio"  
                 ByRef in_flist() As String ) wa<k%_# M  
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    'Redimension the file list array xHt7/8wF  
    Erase in_flist Jqb~RP~  
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    'Tracks how many files are found {9(0s| pr  
    Dim fCount As Long gcnX^[`S  
    fCount = 0 .@):
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    'Recurse directory and search for text files PVg<Ovi^d  
    Dim f As String IP/%=m)\%  
    f = Dir$(in_dir & "*.txt") o/3.U=px~  
    While f <> "" aX1b(h2  
        ReDim Preserve in_flist(fCount) oeg Bk  
        in_flist(fCount) = f fY^CIb$Y  
        fCount += 1 +D5gbxZX  
        f = Dir$() t Cb34Wpf  
    Wend (s&:D`e  
    ReDim Preserve in_flist(fCount-1) %|e)s_%XE  
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End Sub eP"B3Jw  
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