[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： SzXR],dA  
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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。 gi {rqM  
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背景： vo(riHH  
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。 "qh~wKJ  
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。 m4\e`nl  
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步骤 65]>6D43  
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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。 E)>.2{]C>  
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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） Hnft1   
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 t]gZ^5  
例如下所示： ]C'^&:&<  
Sample name:  EDF-C1-56 +L0Jje>Az  
Merging data from file EDF-C1-56 0-0.txt Q6PaT@gs  
Finished merging RPC data for sample EDF-C1-56 :MaP58dhh  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt w`YN#G  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 M"\Iw'5$  
a. 创建一个新的散射库 q!;u4J  
b. 散射模型命名 :_8Nf1B+T  
c. 改变散射模型为“Tabulated BSDF”. F:7d}Jx  
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 ） jWL%*dJrN  
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。 {k}$L|w  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 8/vGA=  
g. 点击OK z{H=;"+rh  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 mV'-1  
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脚本代码： P(%^J6[>  
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'#Language "WWB-COM" 0fJz[;dV>n  
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Option Explicit 8-B6D~i  
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Sub Main &j}:8Tst  
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    'Cleanup icK$W2<8mg  
    ClearOutputWindow() ^ 0
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    Print "Merging RPC Photonics BSDF Data Files" :i3 W U%  
    SetTextColor(255,0,0) 8kLHQ0pmu  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 7#&e0fw/I  
    Print "Note: Do not run this script multiple times without deleting the output file between executions."  "F=ta  
    SetTextColor(0,0,0) Z'UhJuD5  
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    'Current directory of this script (should be the same as the text files being merged) vRh)o1u)  
    Dim cDir As String cJE4uL<  
    cDir = MacroDir$ & "\" XL7||9,(h  
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    'Array which will be populated with the list of files to be merged + )n}n5  
    Dim fList() As String, curFile As String !bIE%cq  
    GetFileList( cDir, fList ) Mt4*`CxtH;  
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    Print "" I5@8=rFk  
    Print "Files found for merging:" "m%EFWUOl  
    For Each curFile In fList d#HlO}  
        Print Chr(9) & curFile G<-<>)zO!  
    Next X[!S7[d-y  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3bRW]mP8  
    Dim nameArray() As String, sampName As String Cg(&WJw(ep  
    nameArray = Split(fList(0)," 0-0.txt") sXm
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    sampName  = nameArray(0) ?bPW*A82{q  
    Print "" &5[B\yv  
    Print "Sample name: " & Chr(9) & sampName '#C5m#v  
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    'Open an output file and write the FRED header data D*>#]0X  
    Dim outFile As String 6zi 5#23  
    outFile = cDir & sampName & "_FRED.txt" |- <72$j  
    Open outFile For Output As #1 0|<9eD\I=  
    Print #1, "type bsdf_data" Z~w2m6;s  
    Print #1, "format angles=deg bsdf=value scale=1" g[*"LOw  
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    'Loop the file list, skip the two header lines and write the remaining data to file "G^TA:O:=  
    Dim lineArray() As String, curLine As Long 0(>3L:  
    For Each curFile In fList h=qT@)h1>  
        Print "Merging data from file " & curFile 6L;]5)#
 
        ReadFile( cDir & curFile, lineArray ) &>!-67  
        For curLine = 2 To UBound(lineArray) Cmp5or6d  
            Print #1, lineArray(curLine) O^PN{u  
        Next )FSEHQ  
    Next /ykc`E?f  
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    'Close the output file rog1  
    Close #1 [mQdc?n\  
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    Print "Finished merging RPC data for sample " & sampName mE=Ur  
    Print "FRED formatted data file: " & Chr(9) & outFile N/'8W9#6  
End Sub +f%"O?  
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'Utility function to read the contents of a file into an array of strings. w+r).PS}C  
Function ReadFile(ByVal fileName As String, _ r\cY R}v  
                  ByRef lineArray() As String) As Long G[*z,2Kb>  
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    ReadFile = -1 f5p/cUzX  
    Dim oFSO As Object %|%eGidu  
    Set oFSO = CreateObject("Scripting.FileSystemObject") oHr0;4Lg6  
    Erase lineArray t\h4-dJn  
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    Dim fid As Long 2;j<{'  
    If oFSO.fileexists( fileName ) Then V= -  
        fid = FreeFile() *dxm|F98  
        Open fileName For Input As fid ^BM !TQ%!  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) -Lq2K3JHyn  
        Close fid cly}[<w!  
    End If '9=b@SaAj  
    Set oFSO = Nothing ,q>cFsY=i?  
    Return UBound( lineArray ) jO/cdLKX(  
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End Function :|$cG~'J  
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Sub GetFileList( ByVal in_dir As String, _ /G|v.#2/g  
                 ByRef in_flist() As String ) "*t0 t  
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    'Redimension the file list array K a& 2>F  
    Erase in_flist ]jY^*o[  
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    'Tracks how many files are found w@&z0ODJ  
    Dim fCount As Long Y9|!=T%  
    fCount = 0 i39ZBs@  
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    'Recurse directory and search for text files wViTMlq  
    Dim f As String [\#ANA"  
    f = Dir$(in_dir & "*.txt") .drY  
    While f <> "" w/O'&],x  
        ReDim Preserve in_flist(fCount) %8D>aS U  
        in_flist(fCount) = f 39hep8+  
        fCount += 1 4# PxJG6m  
        f = Dir$() t$%<eF@w  
    Wend ,(a~vqNQW3  
    ReDim Preserve in_flist(fCount-1) [qW%H,_  
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End Sub Q(cLi:)X2