[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： %}G:R!4 d  
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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。 5Mb1==/R  
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背景： 31|Vb  
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。 ^/HE_keY  
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。 O{rgZ/4Au  
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步骤 nTjQ4y  
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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。 M`umfw T  
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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） 7/(C1II.Q  
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 C+}uH:I'L  
例如下所示： KhZ'Ic[vw  
Sample name:  EDF-C1-56 ~
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Merging data from file EDF-C1-56 0-0.txt yPm)r2Ck  
Finished merging RPC data for sample EDF-C1-56 8T 6jM+ h  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .+aSa?h_  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 1K,bmb xRt  
a. 创建一个新的散射库 2o/}GIKj  
b. 散射模型命名 2P9hx5PiV  
c. 改变散射模型为“Tabulated BSDF”. kaUH#;c>_  
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 ） THK)G2 =  
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。 Cs%'Af  
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， xJ%b<y{@  
g. 点击OK e)\s0#  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 4MRHz{`wa  
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脚本代码： av wU)6L  
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'#Language "WWB-COM" LPT5d 7K@  
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Option Explicit _}`iLA!$I  
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Sub Main .he%a3e  
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    'Cleanup ^l_W9s  
    ClearOutputWindow() yYWGM  
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    Print "Merging RPC Photonics BSDF Data Files" $9*Xfb
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    SetTextColor(255,0,0) sKjg)3Sl  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." X"8Jk4y  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." u-j$
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    SetTextColor(0,0,0) L !yl^c  
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    'Current directory of this script (should be the same as the text files being merged) V'^s5  
    Dim cDir As String 5Z6$90!k  
    cDir = MacroDir$ & "\" YG?W8)T  
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    'Array which will be populated with the list of files to be merged 2={`g/WeE  
    Dim fList() As String, curFile As String #i.M-6SRd  
    GetFileList( cDir, fList ) <8r%_ ']  
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    Print "" v8 ggPI  
    Print "Files found for merging:" b
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    For Each curFile In fList XkuNLs4  
        Print Chr(9) & curFile ;2)@NH  
    Next  $C(}  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. +UHf&i/3
 
    Dim nameArray() As String, sampName As String 3HFsR)  
    nameArray = Split(fList(0)," 0-0.txt") gjvKrg
 
    sampName  = nameArray(0) $0D]d.w=  
    Print "" TS$ 2K  
    Print "Sample name: " & Chr(9) & sampName e][U ;  
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    'Open an output file and write the FRED header data lkFv5^%  
    Dim outFile As String =|pQA~UU#  
    outFile = cDir & sampName & "_FRED.txt" id&;

 
    Open outFile For Output As #1 ~naL1o_FZ  
    Print #1, "type bsdf_data" 8>6+]]O  
    Print #1, "format angles=deg bsdf=value scale=1" ga6M8eOI  
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    'Loop the file list, skip the two header lines and write the remaining data to file V8`t7[r  
    Dim lineArray() As String, curLine As Long JQi)6A?J  
    For Each curFile In fList L!c7$M5xJ  
        Print "Merging data from file " & curFile t~Cul+  
        ReadFile( cDir & curFile, lineArray ) vUvIZa  
        For curLine = 2 To UBound(lineArray) 1nX/5z_U  
            Print #1, lineArray(curLine) @lDoMm,m'  
        Next =d.Z:L9d  
    Next -fT]}T6=  
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    'Close the output file dilRL,  
    Close #1 +P6q wh\v  
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    Print "Finished merging RPC data for sample " & sampName GO+cCNMa"  
    Print "FRED formatted data file: " & Chr(9) & outFile E Rqr0>x  
End Sub LylB3BM  
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'Utility function to read the contents of a file into an array of strings. 2jOh~-LU  
Function ReadFile(ByVal fileName As String, _ 37T<LU  
                  ByRef lineArray() As String) As Long 3/@7$nV  
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    ReadFile = -1 TmoODG
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    Dim oFSO As Object uqXvN'Jr  
    Set oFSO = CreateObject("Scripting.FileSystemObject") >|/NDF=\s  
    Erase lineArray 25::z9i  
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    Dim fid As Long QDF1$,s4i  
    If oFSO.fileexists( fileName ) Then i"r&CS)sT  
        fid = FreeFile() |Eu_K`  
        Open fileName For Input As fid 9.!6wd4mw  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) [YpSmEn}Y  
        Close fid 9H_2Y%_
 
    End If C;1A$]bk  
    Set oFSO = Nothing h*Rh:yCR>  
    Return UBound( lineArray ) G{

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End Function _rR+u56y-  
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Sub GetFileList( ByVal in_dir As String, _ dpDVEEs84  
                 ByRef in_flist() As String ) o )G'._  
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    'Redimension the file list array -}/u?3^-  
    Erase in_flist ^&03D5@LoY  
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    'Tracks how many files are found Vl%AN;o  
    Dim fCount As Long m$ )yd~  
    fCount = 0 eB%KXPhMm  
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    'Recurse directory and search for text files c*-8h{}  
    Dim f As String ,^pM]+NF|  
    f = Dir$(in_dir & "*.txt") @{iws@.  
    While f <> "" {0nZ;1,m  
        ReDim Preserve in_flist(fCount) XI} C|]#  
        in_flist(fCount) = f jrbEJ.  
        fCount += 1 n#uH^@#0  
        f = Dir$() n (7m  
    Wend HgvgO\`]  
    ReDim Preserve in_flist(fCount-1) IL 'i7p  
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End Sub `KqMcAW  
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