[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： HDZl
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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。  73Jm  
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背景： N8#j|yf  
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。 v*=P  
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。 rZaO^}u]  
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步骤 1hGj?L0m.  
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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。 &s(&B>M  
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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） wT::b V{  
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 )(-;H|]?  
例如下所示： u YT$$'
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Sample name:  EDF-C1-56 bG@2f"  
Merging data from file EDF-C1-56 0-0.txt T:Klr=&V  
Finished merging RPC data for sample EDF-C1-56 /YF:WKr2  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt e}d(.H%l0  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 X V;j6g  
a. 创建一个新的散射库 Kmx^\vDs  
b. 散射模型命名 '=fk;AiQ  
c. 改变散射模型为“Tabulated BSDF”. TxP+?1t  
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 ） Xzf,S;XV~  
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。 jj2\;b:a0  
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， RK|*yt"f"  
g. 点击OK 5j1d=h  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 wLXJ?iy3  
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脚本代码： Rxd4{L )n  
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'#Language "WWB-COM" $P0q!  
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Option Explicit PLc5m5  
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Sub Main Ms(xQ[#+  
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    'Cleanup mSxn7LG  
    ClearOutputWindow() 6- i.*!I 8  
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    Print "Merging RPC Photonics BSDF Data Files" UDg's  
    SetTextColor(255,0,0) !EB<N<P"t  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." rXX>I;`&  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 6&eXQl  
    SetTextColor(0,0,0) /;Tc]  
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    'Current directory of this script (should be the same as the text files being merged) &P|[YP37_  
    Dim cDir As String E s5:S#  
    cDir = MacroDir$ & "\" xZ9:9/Vg  
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    'Array which will be populated with the list of files to be merged @ivd|*?k0  
    Dim fList() As String, curFile As String \%=\4%:  
    GetFileList( cDir, fList ) `NsjtT'_  
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    Print "" &&X,1/  
    Print "Files found for merging:" !SQcV'  
    For Each curFile In fList s3Vb2C*  
        Print Chr(9) & curFile %x$U(I}  
    Next { :tO RF  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. MePD:;mm^  
    Dim nameArray() As String, sampName As String ;"wCBuXcu  
    nameArray = Split(fList(0)," 0-0.txt") ((k"*f2%  
    sampName  = nameArray(0) 5G*cAlU  
    Print "" 85GIEUvH/  
    Print "Sample name: " & Chr(9) & sampName f V. c6  
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    'Open an output file and write the FRED header data fSuykbZ  
    Dim outFile As String .gRj^pu   
    outFile = cDir & sampName & "_FRED.txt" fe?Z33V  
    Open outFile For Output As #1 yp.K-  
    Print #1, "type bsdf_data" BPba3G9H  
    Print #1, "format angles=deg bsdf=value scale=1" )\fY1WD  
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    'Loop the file list, skip the two header lines and write the remaining data to file 18>cfDh;N  
    Dim lineArray() As String, curLine As Long \2i7\U  
    For Each curFile In fList Z',!LK!  
        Print "Merging data from file " & curFile 0CrsZtX  
        ReadFile( cDir & curFile, lineArray ) _/s"VYFZ  
        For curLine = 2 To UBound(lineArray) g>@JGzMLP  
            Print #1, lineArray(curLine) TC\+>LXiZ  
        Next bmfM_oz  
    Next IU
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    'Close the output file QU|_ r2LM  
    Close #1 yGZsNd {a&  
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    Print "Finished merging RPC data for sample " & sampName <>cS@V5j  
    Print "FRED formatted data file: " & Chr(9) & outFile S\k<  
End Sub e#(Ck{e  
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'Utility function to read the contents of a file into an array of strings. 'Zfg
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Function ReadFile(ByVal fileName As String, _ Bh>L"'.2  
                  ByRef lineArray() As String) As Long n+~Dc[  
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    ReadFile = -1 XIeLu"TSL  
    Dim oFSO As Object >ZgzE  
    Set oFSO = CreateObject("Scripting.FileSystemObject") *T|B'80  
    Erase lineArray K7+yU3  
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    Dim fid As Long K}VCFV  
    If oFSO.fileexists( fileName ) Then > VG  
        fid = FreeFile() Ccf/hA#mb  
        Open fileName For Input As fid tli.g  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) bLgH3[{  
        Close fid rz?Cn X.t  
    End If kI\m0];KnQ  
    Set oFSO = Nothing RU)35oEV|  
    Return UBound( lineArray ) \oQ]=dDCd%  
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End Function 5,RUPaE  

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Sub GetFileList( ByVal in_dir As String, _
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                 ByRef in_flist() As String ) mo0\t#jA  
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    'Redimension the file list array f^WTsh]  
    Erase in_flist Wgq|Q*  
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    'Tracks how many files are found !d*[QD8  
    Dim fCount As Long GXNf@&  
    fCount = 0 J~Xv R  
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    'Recurse directory and search for text files )s2] -n}W  
    Dim f As String ^E !v D  
    f = Dir$(in_dir & "*.txt") !QUY (  
    While f <> "" v0^9"V:y  
        ReDim Preserve in_flist(fCount) &J[a.:..  
        in_flist(fCount) = f #Ondhy%h[  
        fCount += 1 E_HB[9  
        f = Dir$() 4JSPD#%f  
    Wend !XA3G`}p6s  
    ReDim Preserve in_flist(fCount-1) PJnC  
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End Sub }kbSbRH43  
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