[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： yw1Xxwc  
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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。 ZP-9KA$"  
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背景： YdUcO.V  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 fA=Lb^,M  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 `
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步骤 j
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 1[-`*Ph  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） @X=sfygk  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 LxiN9  
例如下所示： D&]xKx  
Sample name:  EDF-C1-56 /;xrd\du  
Merging data from file EDF-C1-56 0-0.txt vG=Pi'4XXo  
Finished merging RPC data for sample EDF-C1-56 NGZtlNvh  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt *z_`$Y
  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =FdFLrx~l  
a. 创建一个新的散射库 e-.(O8  
b. 散射模型命名 h]IoH0/  
c. 改变散射模型为“Tabulated BSDF”.

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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 ） A;f)`i0l,  
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。 S&;)F|-q  
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， 579t^"ja~  
g. 点击OK Y^|15ek  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 a FWTm,)  
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脚本代码： ETR7%0$r  
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'#Language "WWB-COM" 8v)HTD/C  
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Option Explicit ]{I>HA5[  
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Sub Main c)q=il7ef  
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    'Cleanup =c]We:I  
    ClearOutputWindow() TPY&O{q  

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    Print "Merging RPC Photonics BSDF Data Files" !A14\  
    SetTextColor(255,0,0) Dhk$
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." MR,A{X  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." pTJ_DH  
    SetTextColor(0,0,0) J|cw9u  
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    'Current directory of this script (should be the same as the text files being merged) HD,6  
    Dim cDir As String V=+p8nE0  
    cDir = MacroDir$ & "\" "`'+@KlE  
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    'Array which will be populated with the list of files to be merged O_5;?$[m  
    Dim fList() As String, curFile As String xx?0Ftuq  
    GetFileList( cDir, fList ) H/*i-%]v+(  
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    Print "" J>nta?/,X  
    Print "Files found for merging:" h}S2b@e|  
    For Each curFile In fList Q1H.2JXr  
        Print Chr(9) & curFile 5F:\U  
    Next XD[9wd5w8  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [ .3Gb}B  
    Dim nameArray() As String, sampName As String #!rH}A>n+  
    nameArray = Split(fList(0)," 0-0.txt") cc"<H}g>`  
    sampName  = nameArray(0) i_I`  
    Print "" f_:>36{1^!  
    Print "Sample name: " & Chr(9) & sampName "`w*-O  
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    'Open an output file and write the FRED header data *LvdrPxU=  
    Dim outFile As String 9,}Z1 f\%  
    outFile = cDir & sampName & "_FRED.txt" 5+)_d%v=6!  
    Open outFile For Output As #1 'qeUI}[  
    Print #1, "type bsdf_data" S:c lyx  
    Print #1, "format angles=deg bsdf=value scale=1" )EN,Ry  
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    'Loop the file list, skip the two header lines and write the remaining data to file CT|H1Ry2T  
    Dim lineArray() As String, curLine As Long "7?xaGh8  
    For Each curFile In fList rhN"
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        Print "Merging data from file " & curFile -BsZw. 7P  
        ReadFile( cDir & curFile, lineArray ) 7 S%`]M4;  
        For curLine = 2 To UBound(lineArray) zEeix,IU  
            Print #1, lineArray(curLine) .;D'  
        Next :vC+}.{p  
    Next g G|4+' t  
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    'Close the output file HZ\=NDz  
    Close #1 W7IAW7w8U  
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    Print "Finished merging RPC data for sample " & sampName >DW%i\k1V~  
    Print "FRED formatted data file: " & Chr(9) & outFile #|Je%t}~  
End Sub 14y>~~3C4  
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'Utility function to read the contents of a file into an array of strings. K%/g!t)  
Function ReadFile(ByVal fileName As String, _ X`I=Z ysB  
                  ByRef lineArray() As String) As Long HA0yX?f]  
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    ReadFile = -1 y<y9'tx  
    Dim oFSO As Object Bt
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    Set oFSO = CreateObject("Scripting.FileSystemObject") QW%xwV?8  
    Erase lineArray @9MrTP  
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    Dim fid As Long C,{ Ekbg  
    If oFSO.fileexists( fileName ) Then |:d_IB@  
        fid = FreeFile() e#?rK=C?9  
        Open fileName For Input As fid "%=K_WJ?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0f
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        Close fid \(1WLP$2U  
    End If Z0Qh7xWve  
    Set oFSO = Nothing AE%zqvp>  
    Return UBound( lineArray ) J {\]ZPs  
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End Function {d,^tG}  
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Sub GetFileList( ByVal in_dir As String, _ d,t
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                 ByRef in_flist() As String ) v<?k$ e5  
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    'Redimension the file list array FsfP^a  
    Erase in_flist N3Z6o.k  
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    'Tracks how many files are found @ds.)sKA>  
    Dim fCount As Long Wt!NLlN8  
    fCount = 0 &>hln<a>  
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    'Recurse directory and search for text files 4[K6ZDBU  
    Dim f As String ;3sJ7%`v  
    f = Dir$(in_dir & "*.txt") iIg99c7/&9  
    While f <> "" @]%cUjQ  
        ReDim Preserve in_flist(fCount) U6_GEBz~y  
        in_flist(fCount) = f q.p
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        fCount += 1 \J{%xW>  
        f = Dir$() luO4ap]*  
    Wend h/#s\>)T  
    ReDim Preserve in_flist(fCount-1) 74%Uojl"  
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End Sub Uj~ :|?Wz  
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