[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Uyb0iQ-,s  
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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。 t7-]OY7%w_  
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背景： k^%=\c  
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。 2QaE&8vW  
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。 `r1}:`.m,  
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步骤 BQPmo1B  
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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。 ~7ZZb*].(  
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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） ,A`|jF  
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 95'+8*YCY  
例如下所示： mh}D[K=~%  
Sample name:  EDF-C1-56 } KyoMs  
Merging data from file EDF-C1-56 0-0.txt GLO3v. n;  
Finished merging RPC data for sample EDF-C1-56 j ^j"w(a  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt N0S^{j,i  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 bfA>kn0C  
a. 创建一个新的散射库 &233QRYM  
b. 散射模型命名 2JK '!Ry)  
c. 改变散射模型为“Tabulated BSDF”. nIg 88*6b,  
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 ） [+D]!&P  
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。 (/I6Wa  
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， *w@1@6?j  
g. 点击OK Im~
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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 GrG'G(NQ  
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脚本代码： w|&lRo@1  
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'#Language "WWB-COM" gPCf+>X{  
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Option Explicit ."ZG0Zg  
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Sub Main kfnh1|D=aY  
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    'Cleanup Zm0VaOT$I  
    ClearOutputWindow() eaf-_#qb  
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    Print "Merging RPC Photonics BSDF Data Files" _R
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    SetTextColor(255,0,0) $3"hOEN@5`  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :8@)W<
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." x"q]~u<rB  
    SetTextColor(0,0,0) #@DJf  
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    'Current directory of this script (should be the same as the text files being merged) ;&=jSgr8  
    Dim cDir As String ~!Sd|e:4  
    cDir = MacroDir$ & "\" CqEbQ>
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    'Array which will be populated with the list of files to be merged Rr [_t FM  
    Dim fList() As String, curFile As String ~B{08%|oK  
    GetFileList( cDir, fList ) m?Y-1!E0  
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    Print "" 3=n6NTL  
    Print "Files found for merging:" 0+iRgnd9?  
    For Each curFile In fList `W1uU=c  
        Print Chr(9) & curFile Ac U@H0  
    Next ZS+m}.,whQ  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. *l`yxz@U  
    Dim nameArray() As String, sampName As String %"r9;^bj&<  
    nameArray = Split(fList(0)," 0-0.txt") c"tlNf?  
    sampName  = nameArray(0) RI8*'~ix]  
    Print "" \r:*`Z*y  
    Print "Sample name: " & Chr(9) & sampName #$W5)6ch  
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    'Open an output file and write the FRED header data .pPuBJL]<  
    Dim outFile As String 2 %fcDEG/  
    outFile = cDir & sampName & "_FRED.txt" EpF9&)  
    Open outFile For Output As #1 @}6<,;|DQ  
    Print #1, "type bsdf_data" aR3jeB,=x  
    Print #1, "format angles=deg bsdf=value scale=1" Kkq-x'gt^  
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    'Loop the file list, skip the two header lines and write the remaining data to file 7HW:;2dL  
    Dim lineArray() As String, curLine As Long (.=Y_g
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    For Each curFile In fList Y}BP]#1  
        Print "Merging data from file " & curFile +PE-j| D  
        ReadFile( cDir & curFile, lineArray ) fSd|6iFH  
        For curLine = 2 To UBound(lineArray) 5xr>B7MRM?  
            Print #1, lineArray(curLine) gnZ#86sO  
        Next 
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    Next ZgEV-.>P  
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    'Close the output file 1/mBp+D  
    Close #1 4J[zNB]  
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    Print "Finished merging RPC data for sample " & sampName @$kO7k0{g  
    Print "FRED formatted data file: " & Chr(9) & outFile [?N,3  
End Sub j xI;clr  
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'Utility function to read the contents of a file into an array of strings. to).PI?  
Function ReadFile(ByVal fileName As String, _ sHPAr}14  
                  ByRef lineArray() As String) As Long 8Kl&_-l{b  
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    ReadFile = -1 {i=V:$_#  
    Dim oFSO As Object bK}ZR*)  
    Set oFSO = CreateObject("Scripting.FileSystemObject") !D1#3?L  
    Erase lineArray 8Ys)qx>7'  
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    Dim fid As Long fr`#s\JKw  
    If oFSO.fileexists( fileName ) Then <LH6my  
        fid = FreeFile() $W}:,]hoj  
        Open fileName For Input As fid 0;LF>+fJ  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8aHE=x/TL  
        Close fid u
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    End If W2-l_{  
    Set oFSO = Nothing *>?N>f"  
    Return UBound( lineArray ) PdVY tK%  
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End Function !L;_f'\)6  
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Sub GetFileList( ByVal in_dir As String, _ 'wFhfZB1!B  
                 ByRef in_flist() As String ) mI<sf?.  

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    'Redimension the file list array #\N8E-d  
    Erase in_flist k;<@2C  
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    'Tracks how many files are found v B~VJKD  
    Dim fCount As Long ZYY~A_C  
    fCount = 0 wKdWE`|y  
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    'Recurse directory and search for text files \kV|S=~@  
    Dim f As String ,)U%6=o#}  
    f = Dir$(in_dir & "*.txt") }s?w-u+(c6  
    While f <> "" VDv.N@)7  
        ReDim Preserve in_flist(fCount) \c{sG\ >  
        in_flist(fCount) = f O0rvr$.  
        fCount += 1 ,Gbc4x  
        f = Dir$() #]^C(qmb:  
    Wend r
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    ReDim Preserve in_flist(fCount-1) }LS.bQKqi,  
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End Sub P//nYPyzg  
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