[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 9@h>_1RJz  
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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。 pG" 4qw  
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背景： Jjy}m0)#W_  
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。 J|ILG  
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。 74KFsir@  
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步骤 MM97$  
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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。 :dK%=j*ZK  
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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） uZqo"  
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 >6aCBS?2  
例如下所示： F~{4)`  
Sample name:  EDF-C1-56 KR{kn[2|Q  
Merging data from file EDF-C1-56 0-0.txt m,*f6g  
Finished merging RPC data for sample EDF-C1-56 SkK=VeD>8  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt bT8BJY%+  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 &Z
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a. 创建一个新的散射库 HHX9QebiST  
b. 散射模型命名 wi9fYfuv3R  
c. 改变散射模型为“Tabulated BSDF”. k_!z=6?[:  
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 ） YKk%lZ.8  
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。 Jb0]!*tV  
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， *EotYT  
g. 点击OK 9 /9,[A  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 V,>#!zUv  
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脚本代码： )Dv"seH.  
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'#Language "WWB-COM" Sm-nb*ZyC  
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Option Explicit 5uu{f&?u)  
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Sub Main ZI5UQH/  
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    'Cleanup ,x_g|J _Y  
    ClearOutputWindow() bjR&bIA:  
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    Print "Merging RPC Photonics BSDF Data Files" I{M2nQi  
    SetTextColor(255,0,0) F9d][ P@@  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ~)()PO  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." YrB-;R1+  
    SetTextColor(0,0,0) EK#w: "  
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    'Current directory of this script (should be the same as the text files being merged) ysL8w"t  
    Dim cDir As String l ='lV]  
    cDir = MacroDir$ & "\" .%*.nq  
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    'Array which will be populated with the list of files to be merged S?D2`b  
    Dim fList() As String, curFile As String .}Xkr+ +]  
    GetFileList( cDir, fList ) o]jo R3  
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    Print "" 'W$qi@f_s  
    Print "Files found for merging:" ?p$WqVN}  
    For Each curFile In fList 5Lue.U%a  
        Print Chr(9) & curFile >0512_J+  
    Next 2Y$==j  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^up*KQ3u\  
    Dim nameArray() As String, sampName As String ==IL63  
    nameArray = Split(fList(0)," 0-0.txt") mV^dIm  
    sampName  = nameArray(0)
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    Print "" b5yb~;0  
    Print "Sample name: " & Chr(9) & sampName 1AhL-Lj  
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    'Open an output file and write the FRED header data HI:E&20y  
    Dim outFile As String dedi6Brl  
    outFile = cDir & sampName & "_FRED.txt" M`"2;  
    Open outFile For Output As #1 Q,jlKgB5:  
    Print #1, "type bsdf_data" h#;yA"j1&  
    Print #1, "format angles=deg bsdf=value scale=1" ,ll!19y  
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    'Loop the file list, skip the two header lines and write the remaining data to file &\1Dy}:  
    Dim lineArray() As String, curLine As Long GZO,]%z  
    For Each curFile In fList +!w?g/dV  
        Print "Merging data from file " & curFile 1)k))w9  
        ReadFile( cDir & curFile, lineArray ) r
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        For curLine = 2 To UBound(lineArray) bXtA4O  
            Print #1, lineArray(curLine) ,$CZ(GQ  
        Next 3fBq~Q  
    Next 7O"T`>  
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    'Close the output file VeCpz[r  
    Close #1 kV-a'"W5  
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    Print "Finished merging RPC data for sample " & sampName .k[Ptx>  
    Print "FRED formatted data file: " & Chr(9) & outFile nar=\cs~g  
End Sub =niU6Q}  
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'Utility function to read the contents of a file into an array of strings. M8 ++JI  
Function ReadFile(ByVal fileName As String, _ &0Nd9%>  
                  ByRef lineArray() As String) As Long *6k (xL  
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    ReadFile = -1 }<S|_F  
    Dim oFSO As Object *mBn''a"*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") mz/KGZ5t  
    Erase lineArray R[oKhU  
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    Dim fid As Long Qza[~6  
    If oFSO.fileexists( fileName ) Then p61"a,Xc  
        fid = FreeFile() ][TS|\\  
        Open fileName For Input As fid +>/Q+nh  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) vW~_+:),e  
        Close fid -7\RO%U  
    End If W*VQ"CW{^]  
    Set oFSO = Nothing 60QElJ9D  
    Return UBound( lineArray ) -BNW\]}  
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End Function yKq;EcVx  
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Sub GetFileList( ByVal in_dir As String, _ .8g&V|  
                 ByRef in_flist() As String ) !07$aQYcd  
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    'Redimension the file list array k98-
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    Erase in_flist Hs2L$TX  
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    'Tracks how many files are found cj5pI?@e)  
    Dim fCount As Long aiUn bP  
    fCount = 0 YIjBKh  
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    'Recurse directory and search for text files 'gQm%:qU3r  
    Dim f As String ,ad~6.Z_)  
    f = Dir$(in_dir & "*.txt") @bS>XWI>  
    While f <> "" sE]eIN  
        ReDim Preserve in_flist(fCount) -3haLdRk6  
        in_flist(fCount) = f b>;5#OQfn  
        fCount += 1 ZH.l^'(W  
        f = Dir$() &Gxk
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    Wend H2rh$2  
    ReDim Preserve in_flist(fCount-1) W~R_- ]k@g  
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End Sub H| IsjC
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