[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： A:eG5K}
 
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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。 |) Pi6Y  
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背景： G AQ 'Ti1!  
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。 TFy7HX
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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。 4\p-TPM  
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步骤 8Mu;U3cIW  
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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!bsTvX  
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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） (KTnJZ  
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 7yI`e*EOD  
例如下所示： $D'^t(  
Sample name:  EDF-C1-56 wGJjA
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Merging data from file EDF-C1-56 0-0.txt gi]ZG  
Finished merging RPC data for sample EDF-C1-56 |;u}sX1t9  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0@)%h&mD  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 F>+2DlA`<e  
a. 创建一个新的散射库 gWrAUPS[  
b. 散射模型命名 @T&t.|`  
c. 改变散射模型为“Tabulated BSDF”. iePf ]O*  
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 ） xNpg{cQ=  
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。 lJ{V
  
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， 1pP1d%  
g. 点击OK >t3'_cBC!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 6:?rlh  
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脚本代码： <\@1Zz@ms  
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'#Language "WWB-COM" ^bUxLa[.  
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Option Explicit Y ?'tUV  
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Sub Main ;=jr0\|e  
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    'Cleanup LdTdQ,s<  
    ClearOutputWindow() a<m-V&4x  
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    Print "Merging RPC Photonics BSDF Data Files" 'r+PH*Mr  
    SetTextColor(255,0,0) |dmh  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." +.Bmkim  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 9"sDm}5%  
    SetTextColor(0,0,0) .Q&rfH3  
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    'Current directory of this script (should be the same as the text files being merged) (j&A",^^S  
    Dim cDir As String V 0{tap}  
    cDir = MacroDir$ & "\" Yck~xt&]  
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    'Array which will be populated with the list of files to be merged wJG$c-(\0  
    Dim fList() As String, curFile As String u&]vd /  
    GetFileList( cDir, fList ) $%2H6Eg0  
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    Print "" ~kKrDL
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    Print "Files found for merging:" {6 .o=EyM{  
    For Each curFile In fList kzO&
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        Print Chr(9) & curFile ULBg{e?l8  
    Next A6UO0lyu  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. .ve *Vp
  
    Dim nameArray() As String, sampName As String zAScRg$:?  
    nameArray = Split(fList(0)," 0-0.txt") l@~LV}BI  
    sampName  = nameArray(0) \#dl6:"  
    Print "" .T.5TMiOSq  
    Print "Sample name: " & Chr(9) & sampName NZXjE$<Vr  
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    'Open an output file and write the FRED header data x?r1s#88>  
    Dim outFile As String lDc;__}Ws  
    outFile = cDir & sampName & "_FRED.txt" |M5-5)  
    Open outFile For Output As #1 7#-y-B]l  
    Print #1, "type bsdf_data" z?ucIsbR  
    Print #1, "format angles=deg bsdf=value scale=1" c[cAUsk i  
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    'Loop the file list, skip the two header lines and write the remaining data to file UG[e//m  
    Dim lineArray() As String, curLine As Long or?%-)  
    For Each curFile In fList BWUq%o,@g  
        Print "Merging data from file " & curFile JlZ0n;  
        ReadFile( cDir & curFile, lineArray ) <{ru|-9  
        For curLine = 2 To UBound(lineArray) ~OFvu}]  
            Print #1, lineArray(curLine) 8
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        Next J7&DR^.Sw  
    Next `l]j#qshTm  
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    'Close the output file 4$"D
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    Close #1 Iazk
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    Print "Finished merging RPC data for sample " & sampName /c-nE3+rn  
    Print "FRED formatted data file: " & Chr(9) & outFile KCR N}`^  
End Sub M##';x0  
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'Utility function to read the contents of a file into an array of strings. bEH de*q(  
Function ReadFile(ByVal fileName As String, _ rT7^-B*  
                  ByRef lineArray() As String) As Long $Ua56Y  
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    ReadFile = -1 BBL485`  
    Dim oFSO As Object 3 <SqoJSp  
    Set oFSO = CreateObject("Scripting.FileSystemObject")  46,j9x  
    Erase lineArray KL3<Iz]  
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    Dim fid As Long O!R"v'  
    If oFSO.fileexists( fileName ) Then ')#,X^   
        fid = FreeFile() zg}YGu|J  
        Open fileName For Input As fid F=wRkU  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) $\\lx_)  
        Close fid UuJjO^t  
    End If |X(2Zv^O  
    Set oFSO = Nothing @h?crJ6$  
    Return UBound( lineArray ) pR$6,Vi  
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End Function p2pAvlNoF  
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Sub GetFileList( ByVal in_dir As String, _ -q>^ALf|@>  
                 ByRef in_flist() As String ) :BZ0 7`9  
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    'Redimension the file list array EESN\_{~.  
    Erase in_flist bI ITPxz  
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    'Tracks how many files are found j4.&l3  
    Dim fCount As Long ;5S}~+j  
    fCount = 0 SBfFZw)  
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    'Recurse directory and search for text files ecHP &Z$  
    Dim f As String Wd 2sh  
    f = Dir$(in_dir & "*.txt") tS?lB05TOR  
    While f <> "" h%}(h2W  
        ReDim Preserve in_flist(fCount) p+w8$8)  
        in_flist(fCount) = f Fwfo2  
        fCount += 1  v[,Src  
        f = Dir$() X;GfPw.m  
    Wend i@$*Csj\9*  
    ReDim Preserve in_flist(fCount-1) F:T GsV#  
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End Sub r/r:o
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