[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 83V\O_7j  
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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。 /1/'zF&R-  
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背景： X1B)(|7$  
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。 WP\kg\o  
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。 'j'6x'[>]  
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步骤 [AFR \{  
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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。 g/$RuT2U  
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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） $ZyOBxI  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 6rE8P#  
例如下所示： :yJ#yad  
Sample name:  EDF-C1-56 fGeie m  
Merging data from file EDF-C1-56 0-0.txt 3%9XJ]Qao  
Finished merging RPC data for sample EDF-C1-56 u{uqK7]+  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^"lEa-g&  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ZZkc)
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a. 创建一个新的散射库 J(]b1
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b. 散射模型命名 )Dhx6xM[a  
c. 改变散射模型为“Tabulated BSDF”. Qo3Enwap=  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） t 4M-;y  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 a|y'-r90  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， tIV9Y=ckr0  
g. 点击OK n|H
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 fA1{-JzV<4  
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脚本代码： =`(W^&|  
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'#Language "WWB-COM" w `d9" n  
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Option Explicit p {.6  
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Sub Main >@G"*le*)  
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    'Cleanup ^pY8'LF6  
    ClearOutputWindow() 73u97oe>1  
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    Print "Merging RPC Photonics BSDF Data Files" ep5`&g]3  
    SetTextColor(255,0,0) v`Y{.>[H[  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." _@)-#7  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." @R;k@b   
    SetTextColor(0,0,0) /9SoVU8  
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    'Current directory of this script (should be the same as the text files being merged) /i_FA]Go  
    Dim cDir As String ZjY?T)WE9  
    cDir = MacroDir$ & "\" T_wh)B4xW  
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    'Array which will be populated with the list of files to be merged `l70i2xcj  
    Dim fList() As String, curFile As String 3TV4|&W;  
    GetFileList( cDir, fList ) Mg}/gO%o  
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    Print "" l*CCnqE  
    Print "Files found for merging:" rN.8-  
    For Each curFile In fList icVB?M,m  
        Print Chr(9) & curFile "Il)_Ui  
    Next O\=Zo9(NHF  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. G<rAM+B*g  
    Dim nameArray() As String, sampName As String plr3&T~,&S  
    nameArray = Split(fList(0)," 0-0.txt") )Xt#coagS  
    sampName  = nameArray(0) l LBzY`j  
    Print "" Z
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    Print "Sample name: " & Chr(9) & sampName 'vq0Tw5  
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    'Open an output file and write the FRED header data QAl4w)F  
    Dim outFile As String muK.x7zyl  
    outFile = cDir & sampName & "_FRED.txt" !lZ}kz0  
    Open outFile For Output As #1 F]N?_ bo  
    Print #1, "type bsdf_data" fX\y/C  
    Print #1, "format angles=deg bsdf=value scale=1" o7PS1qcya<  
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    'Loop the file list, skip the two header lines and write the remaining data to file >lJTS t5{  
    Dim lineArray() As String, curLine As Long K0I.3|6C  
    For Each curFile In fList oxnI
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        Print "Merging data from file " & curFile |,H2ge  
        ReadFile( cDir & curFile, lineArray ) .Tw:Y,G  
        For curLine = 2 To UBound(lineArray) p7izy$Wc  
            Print #1, lineArray(curLine) Y}C|4"V  
        Next 8y[Rwa  
    Next Jko=E   
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    'Close the output file R S>qP;V*-  
    Close #1 T>hm\!  
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    Print "Finished merging RPC data for sample " & sampName =jxy4`oF  
    Print "FRED formatted data file: " & Chr(9) & outFile (?GW/pLK]  
End Sub  VS7  
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'Utility function to read the contents of a file into an array of strings. 7&]|c?([4  
Function ReadFile(ByVal fileName As String, _ H_| re  
                  ByRef lineArray() As String) As Long dd +lQJ c  
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    ReadFile = -1 CQ{{J{pU"  
    Dim oFSO As Object w~=xO_%  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |S<!'rY  
    Erase lineArray U(OkTJxv+  
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    Dim fid As Long g"c7$  
    If oFSO.fileexists( fileName ) Then n`jG[{3t&  
        fid = FreeFile() NweGK  
        Open fileName For Input As fid LZ&I<ID`-  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) +n%8
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        Close fid
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    End If 3Tw9Uc\vT  
    Set oFSO = Nothing c&h8Qk3  
    Return UBound( lineArray ) Rz&}e@stl  

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End Function bJ6H6D>  
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Sub GetFileList( ByVal in_dir As String, _ 3rJ LLYR  
                 ByRef in_flist() As String ) F~OQ'59!Pf  
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    'Redimension the file list array 2#/sIu-L  
    Erase in_flist ;K4uu<e\  
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    'Tracks how many files are found Lm1JiPs d  
    Dim fCount As Long eE;j#2SEO  
    fCount = 0 \CS4aIp  
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    'Recurse directory and search for text files "&;X/~j  
    Dim f As String e5;YY  
    f = Dir$(in_dir & "*.txt") y
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    While f <> "" Qs8yJH`v  
        ReDim Preserve in_flist(fCount) Y~#F\v  
        in_flist(fCount) = f Es\J%*\u  
        fCount += 1 jzWgyI1b  
        f = Dir$() j>.1RG  
    Wend uFlf#t =  
    ReDim Preserve in_flist(fCount-1) `/i/AZ{  
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End Sub PTXS8e4