[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： >*35C`^  
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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。 s6 uG`F"  
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背景： +r2+X:#~T  
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。 aTH{'mN  
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。 j()
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步骤 {$0mwAOH "  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 C0T;![/4A  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） Cio 1E-4  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 -_=nDH  
例如下所示： R0KPZv-  
Sample name:  EDF-C1-56 UXJeAE-  
Merging data from file EDF-C1-56 0-0.txt }bb;~  
Finished merging RPC data for sample EDF-C1-56 L+b6!2O,  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (S>C#A=E\  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 G/)O@Ugp  
a. 创建一个新的散射库 n@<YI  
b. 散射模型命名 X
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c. 改变散射模型为“Tabulated BSDF”. bQgc8
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d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） f z'@_4hg  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ZF!h<h&,  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 0"jY.*_EW  
g. 点击OK ^9v4OUG  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 `KZm0d{H  
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脚本代码： Ouk^O}W6  
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'#Language "WWB-COM" `+]Qz =}  
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Option Explicit W: z6Koc0  
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Sub Main j*|VctM  
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    'Cleanup <$D`Z-6  
    ClearOutputWindow() L^1NY3=$  
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    Print "Merging RPC Photonics BSDF Data Files" ]%;:7?5l  
    SetTextColor(255,0,0) )v'WWwXY>  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 6fkRrD  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 5?f ^Rz  
    SetTextColor(0,0,0) M[NV)q/)  
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    'Current directory of this script (should be the same as the text files being merged) d-oMQGOklb  
    Dim cDir As String \;,_S+Fz8  
    cDir = MacroDir$ & "\" `aOFs+<)  
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    'Array which will be populated with the list of files to be merged l[dK[4  
    Dim fList() As String, curFile As String *IB4[6  
    GetFileList( cDir, fList ) =O~_Q-  
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    Print "" H%[eV8  
    Print "Files found for merging:" .#EFLXs  
    For Each curFile In fList 1y:-N6  
        Print Chr(9) & curFile })'B<vq  
    Next b!+hH Hv:  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {B~QQMEow  
    Dim nameArray() As String, sampName As String d9k0F OR1  
    nameArray = Split(fList(0)," 0-0.txt") &5>Kl}7  
    sampName  = nameArray(0)
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    Print "" N"Z{5A  
    Print "Sample name: " & Chr(9) & sampName ,<.V7(|t)  
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    'Open an output file and write the FRED header data ,>:U2%  
    Dim outFile As String |NlO7aQ>2H  
    outFile = cDir & sampName & "_FRED.txt" :@yEQ#nFp  
    Open outFile For Output As #1 [|v][Hwv  
    Print #1, "type bsdf_data" (|2t#'m  
    Print #1, "format angles=deg bsdf=value scale=1" kj Jn2c:y  
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    'Loop the file list, skip the two header lines and write the remaining data to file HVRZ[Y<^  
    Dim lineArray() As String, curLine As Long 6W/`07'  
    For Each curFile In fList -oGdk|Yn  
        Print "Merging data from file " & curFile [z:
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        ReadFile( cDir & curFile, lineArray ) YqscZ(L:y  
        For curLine = 2 To UBound(lineArray) _YRFet[,m  
            Print #1, lineArray(curLine)  8$=n j  
        Next H8=N@l  
    Next xR~hwj  
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    'Close the output file "69s)~  
    Close #1 J4hL_i
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    Print "Finished merging RPC data for sample " & sampName !t"4!3  
    Print "FRED formatted data file: " & Chr(9) & outFile {qk1_yP  
End Sub 10Q ]67  
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'Utility function to read the contents of a file into an array of strings. PI {bmZ  
Function ReadFile(ByVal fileName As String, _ N%@Qf~  
                  ByRef lineArray() As String) As Long JtE M,tK  
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    ReadFile = -1 xo^b&ktQd  
    Dim oFSO As Object l$KA)xbI  
    Set oFSO = CreateObject("Scripting.FileSystemObject") `bq
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    Erase lineArray J0WxR&%a)  
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    Dim fid As Long -_g0C^:<,  
    If oFSO.fileexists( fileName ) Then \doUTr R  
        fid = FreeFile() '@v\{ l  
        Open fileName For Input As fid #
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4
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        Close fid 
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    End If CO/]wS  
    Set oFSO = Nothing (MM]N=Tw4  
    Return UBound( lineArray ) WCZjXDiwJ  
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End Function )MVz$h{c.]  
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Sub GetFileList( ByVal in_dir As String, _ (XTG8W sN  
                 ByRef in_flist() As String ) K8|r&`X0  
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    'Redimension the file list array z_$%-6  
    Erase in_flist $S6`}3  
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    'Tracks how many files are found Qp5VP@t  
    Dim fCount As Long -m zIT4  
    fCount = 0 XX TL..  
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    'Recurse directory and search for text files EU 6oQ  
    Dim f As String 0],r0  
    f = Dir$(in_dir & "*.txt")  4\N;2N  
    While f <> "" Pbn*
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        ReDim Preserve in_flist(fCount) %A/0 '  
        in_flist(fCount) = f L<cx:Vz  
        fCount += 1 HVCe;eI  
        f = Dir$() h+H%?:FX  
    Wend AR%4D3Dma  
    ReDim Preserve in_flist(fCount-1) 9<?M8_  
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End Sub bHnT6Icom