[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 53:u6bb;  
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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。 4qsct@K,  
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背景： ]Xnar:5  
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。 d!:/n  
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。 hz;SDaBA  
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步骤 ~s4JGV~R  
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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。 3{co.+  
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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） 4`#%<G  
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 ,/Gp>Yqx  
例如下所示： c/bT5TIEWs  
Sample name:  EDF-C1-56 1_LKqBgo  
Merging data from file EDF-C1-56 0-0.txt 7mi*#X}  
Finished merging RPC data for sample EDF-C1-56 vFJ4`Gjw(  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Ja*,ht(5  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 b_{+OqI  
a. 创建一个新的散射库 st"@kHQ3  
b. 散射模型命名 9<CUm"%J  
c. 改变散射模型为“Tabulated BSDF”. `O3#/1+  
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 ） Q_,!(N  
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。 oSMIWwg7G  
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， av(qV$2  
g. 点击OK u SZfim@Z7  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 j^8Hjg  
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脚本代码： =u9e5n  
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'#Language "WWB-COM" QrmGrRH  
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Option Explicit aF"PB h=  
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Sub Main E]a,2{&8<  
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    'Cleanup O[1Q#  
    ClearOutputWindow() K~UT@,CS60  
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    Print "Merging RPC Photonics BSDF Data Files" 9Y# vKb{>  
    SetTextColor(255,0,0) L-|7 &  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ^JIs:\g<<  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." !h1|B7N  
    SetTextColor(0,0,0) P1TTaYu  
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    'Current directory of this script (should be the same as the text files being merged) P6^\*xkMr  
    Dim cDir As String }darXtZKkK  
    cDir = MacroDir$ & "\" K nn<q=';G  
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    'Array which will be populated with the list of files to be merged K)`l >o1  
    Dim fList() As String, curFile As String %tkL<e  
    GetFileList( cDir, fList ) :Z;kMrU  
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    Print "" Hn)^C{RN*{  
    Print "Files found for merging:" B$97"$#u  
    For Each curFile In fList ~ebm,3?  
        Print Chr(9) & curFile = p2AK\  
    Next :NwFJc  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J0@#xw=+  
    Dim nameArray() As String, sampName As String )lx;u.$4  
    nameArray = Split(fList(0)," 0-0.txt") 4NFvX4  
    sampName  = nameArray(0) pi*?fUg!W  
    Print "" [ dVRVm0N  
    Print "Sample name: " & Chr(9) & sampName NTM.Vj -_h  
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    'Open an output file and write the FRED header data ",E$}= ,Z  
    Dim outFile As String 5Obv/C  
    outFile = cDir & sampName & "_FRED.txt" :bp8S@  
    Open outFile For Output As #1 #)%dG3)e  
    Print #1, "type bsdf_data" NydoX9  
    Print #1, "format angles=deg bsdf=value scale=1" #k)J);&ZA  
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    'Loop the file list, skip the two header lines and write the remaining data to file ?O e,  
    Dim lineArray() As String, curLine As Long W2,Uw1\:1  
    For Each curFile In fList P.t7_v>  
        Print "Merging data from file " & curFile h4M>k{  
        ReadFile( cDir & curFile, lineArray ) R^4 j0L  
        For curLine = 2 To UBound(lineArray) 9;pD0h|  
            Print #1, lineArray(curLine) Mg^3Y'{o  
        Next !Ie={BpzbZ  
    Next +u7nx  
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    'Close the output file DVyxe
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    Close #1 z"@UNypc,  
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    Print "Finished merging RPC data for sample " & sampName q&k?$rn  
    Print "FRED formatted data file: " & Chr(9) & outFile ?m.Ry  
End Sub ->YF</I  
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'Utility function to read the contents of a file into an array of strings. ^5gB?V,  
Function ReadFile(ByVal fileName As String, _ Nj4^G ~_  
                  ByRef lineArray() As String) As Long p8u-
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    ReadFile = -1 XbAoW\D(  
    Dim oFSO As Object D~<0CQ3n.  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 8 =<&9TmE  
    Erase lineArray (V+iJ_1g{  
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    Dim fid As Long SE!0f&  
    If oFSO.fileexists( fileName ) Then baM@HpMhM  
        fid = FreeFile() tJY3k$YX  
        Open fileName For Input As fid |/35c0IM  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3LD`Ep   
        Close fid 0j|JyS:}G  
    End If Jq?"?d|:  
    Set oFSO = Nothing ?wS/KEl=O  
    Return UBound( lineArray ) ::rKW*?  
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End Function ZzuWN&  
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Sub GetFileList( ByVal in_dir As String, _ %g*AGu`  
                 ByRef in_flist() As String ) r$Ck:Q}  
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    'Redimension the file list array 5S?+03h~  
    Erase in_flist 4ky@rcD1  
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    'Tracks how many files are found RBzBR)@5  
    Dim fCount As Long )`.'QW  
    fCount = 0 S+(-k0  
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    'Recurse directory and search for text files !G3d5d2)C  
    Dim f As String 9W<I~  
    f = Dir$(in_dir & "*.txt") =m?x|Zc_v  
    While f <> "" ^h@1tFF  
        ReDim Preserve in_flist(fCount) PKM8MYvo  
        in_flist(fCount) = f 2aUy1*aM  
        fCount += 1 RK`C31Ws  
        f = Dir$() S20L@e"U  
    Wend k9<P]%  
    ReDim Preserve in_flist(fCount-1) g4 |s9RMD  
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End Sub n++L =&Wd  
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