[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 8moX"w\~_h  
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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。 K'~wlO@O  
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背景： r*<)QP^B~  
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。 }!b9L]  
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。  rxQn[  
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步骤 dL'hC#!h  
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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。 QA\eXnR  
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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） VZ{aET!  
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 09`5<9/  
例如下所示： P&C,EE$  
Sample name:  EDF-C1-56 t0p^0   
Merging data from file EDF-C1-56 0-0.txt LX[J6YKR  
Finished merging RPC data for sample EDF-C1-56 \"c;MK{  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Fku9hB  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 (UPkb$Qc  
a. 创建一个新的散射库 ma>{((N  
b. 散射模型命名 
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c. 改变散射模型为“Tabulated BSDF”. rIp84}  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ）  @*'|8%  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 %>}6>nT#  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 6*Jd8Bva\o  
g. 点击OK ^Afq)26D  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 .Y[sQO~%  
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脚本代码： !Gsr* F{.  
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'#Language "WWB-COM" 5FcKY_  
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Option Explicit s2L|J[Y"s  
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Sub Main RRig  
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    'Cleanup h7<Zkf  
    ClearOutputWindow() kxp$Nnk  
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    Print "Merging RPC Photonics BSDF Data Files" O{rgx~lLJt  
    SetTextColor(255,0,0) _In[Z?P}  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." '`$a l7D  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." <_-&{Pv  
    SetTextColor(0,0,0) My0h9'K  
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    'Current directory of this script (should be the same as the text files being merged) P|YBCH  
    Dim cDir As String <n< @ O5  
    cDir = MacroDir$ & "\" ~,KAJ7O_  
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    'Array which will be populated with the list of files to be merged tJo,^fdfv  
    Dim fList() As String, curFile As String GJW+'-f  
    GetFileList( cDir, fList ) W@v@|D@  
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    Print "" 5OP$n]|(  
    Print "Files found for merging:" uhvmh  
    For Each curFile In fList \dSMF,E  
        Print Chr(9) & curFile ~fB}v  
    Next L{(\k$>'  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. | iEhe  
    Dim nameArray() As String, sampName As String mz@`*^7?  
    nameArray = Split(fList(0)," 0-0.txt") X
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    sampName  = nameArray(0) [?VYxX@  
    Print "" '{WYh
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    Print "Sample name: " & Chr(9) & sampName Y\luz`v  
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    'Open an output file and write the FRED header data CPc<!CC  
    Dim outFile As String }yCJ#}  
    outFile = cDir & sampName & "_FRED.txt" 9.ZhkvR4A  
    Open outFile For Output As #1 wP3_RA]z  
    Print #1, "type bsdf_data" 'gd3 w~  
    Print #1, "format angles=deg bsdf=value scale=1" [?$ZB),L8  
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    'Loop the file list, skip the two header lines and write the remaining data to file peqoLeJI  
    Dim lineArray() As String, curLine As Long aZ^P*|_K3  
    For Each curFile In fList !U.Xb6  
        Print "Merging data from file " & curFile 2T/C!^iJ)  
        ReadFile( cDir & curFile, lineArray ) bG=CIa&@  
        For curLine = 2 To UBound(lineArray) 6=o@X  
            Print #1, lineArray(curLine) 8$a4[s  
        Next ^/\OS@CT\  
    Next V_jVVy30Ji  
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    'Close the output file -G&>b D  
    Close #1 T677d.zaT  
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    Print "Finished merging RPC data for sample " & sampName e:}8|e~T  
    Print "FRED formatted data file: " & Chr(9) & outFile 7qSlqA<Hs  
End Sub bHE'R!*  
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'Utility function to read the contents of a file into an array of strings. GczGW4\P'  
Function ReadFile(ByVal fileName As String, _ yyZH1A  
                  ByRef lineArray() As String) As Long xExy?5H7  
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    ReadFile = -1 %||}WT-wv  
    Dim oFSO As Object  b<v\  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 7cin?Z1  
    Erase lineArray |5)~WoV/G  
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    Dim fid As Long mMmzi4HL  
    If oFSO.fileexists( fileName ) Then ?6.vd]oNO  
        fid = FreeFile() 1\1a;Q3W%,  
        Open fileName For Input As fid fU^B 3S6X  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ! {lcF%  
        Close fid I7b(fc-r  
    End If `EVTlq@<  
    Set oFSO = Nothing <K!5N&vh  
    Return UBound( lineArray ) M iIH&z  
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End Function
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Sub GetFileList( ByVal in_dir As String, _ m&o}qzC'y  
                 ByRef in_flist() As String ) 0z{S@  
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    'Redimension the file list array UN_f2  
    Erase in_flist =BJ/ZM  
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    'Tracks how many files are found Y'"2s~_ Z  
    Dim fCount As Long hKjvD.6]%  
    fCount = 0 _`Ey),c_  
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    'Recurse directory and search for text files Zy@35;r  
    Dim f As String 06*R)siC  
    f = Dir$(in_dir & "*.txt") quk~z};R>\  
    While f <> "" 6~GaFmW=  
        ReDim Preserve in_flist(fCount) .E!7}O6  
        in_flist(fCount) = f 84tuN
  
        fCount += 1 f ^mxj/%L  
        f = Dir$() |o~<Ti6]  
    Wend g.aNITjP  
    ReDim Preserve in_flist(fCount-1) OqUEj 0X  
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End Sub b6_*ljM