[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Ken|!rL  
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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。 qAm$yfYs`  
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背景： c&)
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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。 Y5=~>*e  
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。 aGNVqS%y  
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步骤 GmtMA|  
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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。 ^G=wRtS  

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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） jpyV52  
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 E!Hq%L!/  
例如下所示： ADA%$NhJ!  
Sample name:  EDF-C1-56 O;f^'N  
Merging data from file EDF-C1-56 0-0.txt F}0QocD  
Finished merging RPC data for sample EDF-C1-56 ;|w &n  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt m(nlu  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 !$AVlMnJ  
a. 创建一个新的散射库 KoiU\r  
b. 散射模型命名 SDiZOypS  
c. 改变散射模型为“Tabulated BSDF”. jd l1Q<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 ） /V~L:0%  
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。 (U2G"  
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， = Ii@-C  
g. 点击OK swG^L$r`  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 8_>\A= E  
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脚本代码： lZ0+:DaP2  
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'#Language "WWB-COM" J=*y>Zt-b  
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Option Explicit )&+_T+\  
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Sub Main _4o2AS:j  
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    'Cleanup yZK1bnYG|I  
    ClearOutputWindow() pW:h\}%`n  
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    Print "Merging RPC Photonics BSDF Data Files" Yp 6;Y7^  
    SetTextColor(255,0,0) ,p1 (0i  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ;VK;_d  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." WeuV+}\b  
    SetTextColor(0,0,0) 90sMS]a  
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    'Current directory of this script (should be the same as the text files being merged) E}k#-+u<S4  
    Dim cDir As String Sx;zvc  
    cDir = MacroDir$ & "\" z(.$>O&6H  
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    'Array which will be populated with the list of files to be merged
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    Dim fList() As String, curFile As String ||`w MWq  
    GetFileList( cDir, fList ) +n,8o:fU:  
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    Print "" 1GOa'bxm  
    Print "Files found for merging:" a
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    For Each curFile In fList Q)#<T]~=  
        Print Chr(9) & curFile l]WV?^*  
    Next 6$ IXER  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]
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    Dim nameArray() As String, sampName As String &@dMk4BH<  
    nameArray = Split(fList(0)," 0-0.txt") CSr{MF`]e  
    sampName  = nameArray(0) cnLC>_hY  
    Print "" v^@L?{"}8  
    Print "Sample name: " & Chr(9) & sampName 1"/V?ArfL  
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    'Open an output file and write the FRED header data O b8[P=  
    Dim outFile As String V.y+u7<3}  
    outFile = cDir & sampName & "_FRED.txt" LvWU %
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    Open outFile For Output As #1 Td;e\s/]  
    Print #1, "type bsdf_data" rFx2S  
    Print #1, "format angles=deg bsdf=value scale=1" V2g$"W?3  
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    'Loop the file list, skip the two header lines and write the remaining data to file ~;+i[Z&e  
    Dim lineArray() As String, curLine As Long `W]a @\EYA  
    For Each curFile In fList .&sguAyG  
        Print "Merging data from file " & curFile `t6lnO  
        ReadFile( cDir & curFile, lineArray ) N"r ;d+LTL  
        For curLine = 2 To UBound(lineArray) Y\+^\`Tqu  
            Print #1, lineArray(curLine) ~%<PEl|  
        Next lg8~`96  
    Next 'Fonn  
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    'Close the output file }\823U %  
    Close #1 t<`ar@}  
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    Print "Finished merging RPC data for sample " & sampName $35Oyd3s<  
    Print "FRED formatted data file: " & Chr(9) & outFile @%#(Hse  
End Sub ,7j`5iq[m  
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'Utility function to read the contents of a file into an array of strings. >p<(CVX[  
Function ReadFile(ByVal fileName As String, _ PA,j;{,(b  
                  ByRef lineArray() As String) As Long _eO]awsA  
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    ReadFile = -1 ED?s[K  
    Dim oFSO As Object |HG%o 3E]  
    Set oFSO = CreateObject("Scripting.FileSystemObject") e<p$Op  
    Erase lineArray I?fE=2}9  
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    Dim fid As Long Yt#($}p  
    If oFSO.fileexists( fileName ) Then UoLO#C0i  
        fid = FreeFile() PH7L#H^  
        Open fileName For Input As fid ]$L[3qA.  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?BLOc;I&a  
        Close fid 3Y
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    End If 1B1d>V$*  
    Set oFSO = Nothing +$UfP(XmH  
    Return UBound( lineArray ) <=zGaU,  
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End Function `3+U6>U [  
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Sub GetFileList( ByVal in_dir As String, _ =?f}
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                 ByRef in_flist() As String ) kEXcEF_9P  
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    'Redimension the file list array ;=7z!:)  
    Erase in_flist mi-\PD>X  
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    'Tracks how many files are found Qb|dp~K.M  
    Dim fCount As Long c3}}cFe  
    fCount = 0 .Yf h*  
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    'Recurse directory and search for text files -0]aOT--  
    Dim f As String RhJ<<T.2  
    f = Dir$(in_dir & "*.txt") }Sh-4:-D  
    While f <> "" 2Z97Tq  
        ReDim Preserve in_flist(fCount) =3T?U_u@  
        in_flist(fCount) = f n;=A'g|Q  
        fCount += 1  jPs+i  
        f = Dir$() C{ti>'"V  
    Wend y H'\<bT  
    ReDim Preserve in_flist(fCount-1) |`okIqp  
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End Sub |4c==7.  
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