[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ,|?#+O{  
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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。 Z[Iej:o5  
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背景： 5&L*'k
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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。 U Rq9:{  
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。 1>OU~A"  
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步骤 \SwqBw  
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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。 j
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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） u6Ux nqNc  
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 \}=W*xxB  
例如下所示： ^e =xEZD  
Sample name:  EDF-C1-56 iGj
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Merging data from file EDF-C1-56 0-0.txt
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Finished merging RPC data for sample EDF-C1-56 QFhyidm=]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @raJB'  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ~mah.8G  
a. 创建一个新的散射库 {(F}SF{  
b. 散射模型命名 5RO6YxQ  
c. 改变散射模型为“Tabulated BSDF”. .9g :-hv  
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 ） @{3_7  
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。 &pz`gn
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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， <.BY=z=H  
g. 点击OK \ E5kpm  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 {LqYb:/C5U  
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脚本代码： !&@t  
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'#Language "WWB-COM" w+!V,lU"^  
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Option Explicit UN;U+5,t  
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Sub Main hmb=_W  
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    'Cleanup r
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    ClearOutputWindow() l#+@!2z  
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    Print "Merging RPC Photonics BSDF Data Files" o?.VW/"  
    SetTextColor(255,0,0) i{Q,>Rt  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." +Bt%W%_X  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." \sW>Y#9]  
    SetTextColor(0,0,0) J]48th0,  
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    'Current directory of this script (should be the same as the text files being merged) d=\\ik8  
    Dim cDir As String s6 K~I  
    cDir = MacroDir$ & "\" )B~{G\jS  
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    'Array which will be populated with the list of files to be merged S|yDGT1  
    Dim fList() As String, curFile As String wb]Z4/j#  
    GetFileList( cDir, fList ) NcSi%]  
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    Print "" %5Elj<eHZ  
    Print "Files found for merging:" $Nj'_G\}  
    For Each curFile In fList =1O;,8`
 
        Print Chr(9) & curFile +tYskx/  
    Next Di$++T8"  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. sN1I
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    Dim nameArray() As String, sampName As String #.OCoc  
    nameArray = Split(fList(0)," 0-0.txt") "*d%el\63  
    sampName  = nameArray(0) &&96kg3  
    Print "" jgYe\dinM  
    Print "Sample name: " & Chr(9) & sampName 7~D5Gy  
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    'Open an output file and write the FRED header data k)9 pkPl  
    Dim outFile As String @_;vE(!5  
    outFile = cDir & sampName & "_FRED.txt" i^}DIx{  
    Open outFile For Output As #1 +6<g N[  
    Print #1, "type bsdf_data" #'y^@90R  
    Print #1, "format angles=deg bsdf=value scale=1" >lO]/3j1  
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    'Loop the file list, skip the two header lines and write the remaining data to file *}ZKQ  
    Dim lineArray() As String, curLine As Long yfAh=  
    For Each curFile In fList 6a{b%e`  
        Print "Merging data from file " & curFile 0IbR>zFg.  
        ReadFile( cDir & curFile, lineArray ) 6bbzgULl  
        For curLine = 2 To UBound(lineArray) p,OB;Ncf/  
            Print #1, lineArray(curLine) P"+K'B7K3  
        Next $n<X'7@0  
    Next `u;4Z2Lr0  
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    'Close the output file FK,YVY  
    Close #1 r5!Sps3B  
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    Print "Finished merging RPC data for sample " & sampName %h=cwT6  
    Print "FRED formatted data file: " & Chr(9) & outFile nrz2f7d$  
End Sub sYyya:ykxT  
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'Utility function to read the contents of a file into an array of strings. H3BMN}K~  
Function ReadFile(ByVal fileName As String, _ "nn>I}jK  
                  ByRef lineArray() As String) As Long 7{u1ynt  
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    ReadFile = -1 D{, b|4  
    Dim oFSO As Object /2]=.bLwz  
    Set oFSO = CreateObject("Scripting.FileSystemObject") X&|y|  
    Erase lineArray V#d8fRm  
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    Dim fid As Long 2?9gf,U  
    If oFSO.fileexists( fileName ) Then 2E=vMAS  
        fid = FreeFile() f`,isy[  
        Open fileName For Input As fid 1n+JHXR\  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) "@+r|x  
        Close fid P&8QKX3 j^  
    End If c_.4~>qw  
    Set oFSO = Nothing |gJI}"T  
    Return UBound( lineArray ) !" 7ip9a  
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End Function Qj/.x#T  
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Sub GetFileList( ByVal in_dir As String, _ )|i]"8I  
                 ByRef in_flist() As String ) pksF|VS  
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    'Redimension the file list array 5R"(4a P  
    Erase in_flist gye'_AR?k  
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    'Tracks how many files are found -JB~yO?0  
    Dim fCount As Long @m(ja@YC  
    fCount = 0
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    'Recurse directory and search for text files xO` O$ie  
    Dim f As String {qjw  S1v  
    f = Dir$(in_dir & "*.txt") A@k`$xevVj  
    While f <> "" J+20]jI  
        ReDim Preserve in_flist(fCount) CLX!qw]@ +  
        in_flist(fCount) = f dd@-9?6M  
        fCount += 1 ~xP4}gs1  
        f = Dir$() C%\.  
    Wend Wk&g!FR  
    ReDim Preserve in_flist(fCount-1) *1clPK  
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End Sub n{v[mqm^