[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： :Ko6.|  
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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。 .mt%8GM  
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背景：  OegeZV  
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。 by X!,  
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。 i(^U<DW$  
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步骤 "y,YC M`  
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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。 ~,b^f{7`!  
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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） P5h|* ?=  
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 QEhn  
例如下所示： c+9L6}D  
Sample name:  EDF-C1-56 !hBpon  
Merging data from file EDF-C1-56 0-0.txt lmvp,BzC  
Finished merging RPC data for sample EDF-C1-56 XH"+oW  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt GQqGrUQ*}  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 \^c4v\s<o#  
a. 创建一个新的散射库 //q(v,D%Q  
b. 散射模型命名 EiL#Dwx  
c. 改变散射模型为“Tabulated BSDF”. zTF{ g+  
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 ） b-&iJ &>'  
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。 lW&(dn)}  
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， }}JMwT  
g. 点击OK elOeXYO0  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 cqS :Zq  
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脚本代码： Ke\\B o,  
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'#Language "WWB-COM" GM%+yS}(P  
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Option Explicit mgq!)  
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Sub Main W$rWg>4>  
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    'Cleanup GXtMX ha,  
    ClearOutputWindow() ~s!Q0G^G  
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    Print "Merging RPC Photonics BSDF Data Files" 4Gc M  
    SetTextColor(255,0,0) _ E;T"SC  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ]pax,|+$C  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." t]yxLl\  
    SetTextColor(0,0,0) m1"m KM  
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    'Current directory of this script (should be the same as the text files being merged) H U|.5tP  
    Dim cDir As String ,XD" p1(|G  
    cDir = MacroDir$ & "\" {3~VLdy  

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    'Array which will be populated with the list of files to be merged :!`"GaTy  
    Dim fList() As String, curFile As String Bt+^H6cb  
    GetFileList( cDir, fList ) r
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    Print "" b_0THy.Z  
    Print "Files found for merging:" Dyov}
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    For Each curFile In fList -Zt!H%U  
        Print Chr(9) & curFile _gvFs%J  
    Next 3nq?Y8yac  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. #2{-6ey  
    Dim nameArray() As String, sampName As String ;O"?6d0  
    nameArray = Split(fList(0)," 0-0.txt") sVLvnX,  
    sampName  = nameArray(0) BQ@7^E[  
    Print "" 1Ms[$$b$  
    Print "Sample name: " & Chr(9) & sampName bjZJP\6  
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    'Open an output file and write the FRED header data d+9V% T  
    Dim outFile As String 'solCAy  
    outFile = cDir & sampName & "_FRED.txt" eA/n.V$z  
    Open outFile For Output As #1 ,T/Gv;wa2  
    Print #1, "type bsdf_data" 7=G2sOC  
    Print #1, "format angles=deg bsdf=value scale=1" Kb.qv)6i*  
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    'Loop the file list, skip the two header lines and write the remaining data to file *$tXm4 O[  
    Dim lineArray() As String, curLine As Long w_9^YO!!  
    For Each curFile In fList `+7F H  
        Print "Merging data from file " & curFile SQp|  
        ReadFile( cDir & curFile, lineArray ) P*|N)S)X%  
        For curLine = 2 To UBound(lineArray) xEb>6+-F@  
            Print #1, lineArray(curLine) )H8_.]|  
        Next h<9s& p  
    Next pu-HEv}]a|  
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    'Close the output file W^(zP/  
    Close #1 i2F7O"f.  
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    Print "Finished merging RPC data for sample " & sampName Wn%P.`o#  
    Print "FRED formatted data file: " & Chr(9) & outFile O[@!1SKT0  
End Sub 9:j?Jvw$  
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'Utility function to read the contents of a file into an array of strings. <Xf6?nyZ(  
Function ReadFile(ByVal fileName As String, _ 2M %j-yG"  
                  ByRef lineArray() As String) As Long XJ18(Q|w'  
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    ReadFile = -1 l45/$G7  
    Dim oFSO As Object dkQ4D2W*\  
    Set oFSO = CreateObject("Scripting.FileSystemObject") <r%K i`u(p  
    Erase lineArray ]vrZGX a+  
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    Dim fid As Long CSM"Kz`  
    If oFSO.fileexists( fileName ) Then "J VIkC  
        fid = FreeFile() 7v: XAU  
        Open fileName For Input As fid #M,&g{  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) N5Js.j>z  
        Close fid z7K{ ,y  
    End If M4^G3c<  
    Set oFSO = Nothing /cjz=r1U>  
    Return UBound( lineArray )  Nx}nOm  
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End Function
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Sub GetFileList( ByVal in_dir As String, _ Fmk:[hMw  
                 ByRef in_flist() As String ) i:lc]B  
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    'Redimension the file list array mm/\\my  
    Erase in_flist ,Qj G|P  
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    'Tracks how many files are found f:o.[4p2  
    Dim fCount As Long -amo8V;2H  
    fCount = 0 ~7m`p3W@  
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    'Recurse directory and search for text files m+QS -woHn  
    Dim f As String c_/BS n  
    f = Dir$(in_dir & "*.txt") <Q[%:LD  
    While f <> "" _4{0He`q  
        ReDim Preserve in_flist(fCount) $BqiC!~  
        in_flist(fCount) = f Lg:1zC  
        fCount += 1 bz*@[NQ  
        f = Dir$() K#3^GB3P  
    Wend LdUz;sb  
    ReDim Preserve in_flist(fCount-1) }%g[1 #%(  
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End Sub Ly=.  
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