[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： Md!L@gX6<  
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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。 =W+ h.?  
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背景： %V r vu5  
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。 06hzCWm#  
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。 5R^e  
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步骤 h7],
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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。 oW0A8_|9  
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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） )8BGN'jyi  
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 Y&vn`#   
例如下所示： l,z# :k  
Sample name:  EDF-C1-56 )-2sk@y  
Merging data from file EDF-C1-56 0-0.txt -)
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Finished merging RPC data for sample EDF-C1-56 FE}!I  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7d9kr?3(U  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 lrn3yDkR?  
a. 创建一个新的散射库 N0Y$QWr_$  
b. 散射模型命名 px|y_.DB2x  
c. 改变散射模型为“Tabulated BSDF”. a/})X[2  
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 ） jZRf{  
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。 b=V"$(Q  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， @UbH;m  
g. 点击OK YH_m
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 JCL+uEX4S  
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脚本代码： jO` b&]0  
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'#Language "WWB-COM" ,'FH[2  
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Option Explicit uc.dtq!  
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Sub Main HR.^ y$IE  
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    'Cleanup 7(ni_|$|  
    ClearOutputWindow() E5^P*6c(  
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    Print "Merging RPC Photonics BSDF Data Files" hW^*b:v{  
    SetTextColor(255,0,0) QNH-b9u>8  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 79DzrLu  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." DC&3=Nd  
    SetTextColor(0,0,0) (8Q0?SZN  
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    'Current directory of this script (should be the same as the text files being merged) wiwAdYEQ\  
    Dim cDir As String @W4tnM,#  
    cDir = MacroDir$ & "\" 5=;LHS*   
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    'Array which will be populated with the list of files to be merged gD13(G98  
    Dim fList() As String, curFile As String >GbCRN~  
    GetFileList( cDir, fList ) i~};5j(  
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    Print "" :i{Svb*_'  
    Print "Files found for merging:" Ri<7!Y?l  
    For Each curFile In fList S]}hh,A  
        Print Chr(9) & curFile ^{Vt  
    Next iMT[sb  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e;|:
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    Dim nameArray() As String, sampName As String `u<\ 4&W  
    nameArray = Split(fList(0)," 0-0.txt") \ F\ /<  
    sampName  = nameArray(0) I]4L0r-  
    Print "" _u[2R=h  
    Print "Sample name: " & Chr(9) & sampName $ \yZ;Z:  
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    'Open an output file and write the FRED header data mp!S<m  
    Dim outFile As String lQ8h-Tz  
    outFile = cDir & sampName & "_FRED.txt" +:IwP  
    Open outFile For Output As #1 #Nv^F  
    Print #1, "type bsdf_data" K@f@vyw]  
    Print #1, "format angles=deg bsdf=value scale=1"
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    'Loop the file list, skip the two header lines and write the remaining data to file xJ$/#UdP  
    Dim lineArray() As String, curLine As Long tj'xjX  
    For Each curFile In fList f:\)oIW9Kk  
        Print "Merging data from file " & curFile Cr7T=&L  
        ReadFile( cDir & curFile, lineArray ) ]+"25V'L  
        For curLine = 2 To UBound(lineArray) }&*wJ]j`L  
            Print #1, lineArray(curLine) [%0{7pz}  
        Next [%uj+?}6O  
    Next ~E8
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    'Close the output file /e:kBjysJ  
    Close #1 
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    Print "Finished merging RPC data for sample " & sampName n@JZ2K4  
    Print "FRED formatted data file: " & Chr(9) & outFile O)aWTI  
End Sub cXd?48O  
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'Utility function to read the contents of a file into an array of strings. @^2?97i c  
Function ReadFile(ByVal fileName As String, _ L0Ycf|[s,  
                  ByRef lineArray() As String) As Long n9%&HDl4  
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    ReadFile = -1 NT0im%  
    Dim oFSO As Object 6CV9ewr  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Y'{F^VxA/  
    Erase lineArray NQmd
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    Dim fid As Long lz [s  
    If oFSO.fileexists( fileName ) Then iW9o-W a  
        fid = FreeFile() xXRlQ|84  
        Open fileName For Input As fid 1iJaj  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) BN~gk~t_  
        Close fid ,J4rKGG  
    End If JW}
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    Set oFSO = Nothing tW -f_0a.  
    Return UBound( lineArray ) ?'IY0^  
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End Function ]zATdfa  
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Sub GetFileList( ByVal in_dir As String, _ 1EemVZdY  
                 ByRef in_flist() As String ) 1!
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    'Redimension the file list array K(3_1*
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    Erase in_flist *DcB?8%  
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    'Tracks how many files are found nJhaI  
    Dim fCount As Long BW
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    fCount = 0 =#>F' A  
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    'Recurse directory and search for text files NZL$#bRB  
    Dim f As String rQsYt/  
    f = Dir$(in_dir & "*.txt") [vTk*#Cl4  
    While f <> "" l<)k`lrMX4  
        ReDim Preserve in_flist(fCount) aCF=Og  
        in_flist(fCount) = f vACJE  
        fCount += 1 +pY--5t  
        f = Dir$() $4:Se#nl  
    Wend G -V~
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    ReDim Preserve in_flist(fCount-1) mX
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End Sub 8)ykXx/f@