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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 Pn0V{SJOJ%  
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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。
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    背景 Y6f0 ?lB  
    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。 r/SV.` k  
    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。 dx?4)lb  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ~]3y66 7  
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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。 .>_p7=a  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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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) zrri&QDF<  
    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 4 @ )|N'  
    例如下所示: (bY#!16C:  
    Sample name:  EDF-C1-56 I8rtta  
    Merging data from file EDF-C1-56 0-0.txt wS9EC}s:Q  
    Finished merging RPC data for sample EDF-C1-56 $ba3dqbCW  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt B/7c`V  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 @#xh)"}  
    a. 创建一个新的散射库 jw]~g+x#$  
    b. 散射模型命名 Q0s!]Dk  
    c. 改变散射模型为“Tabulated BSDF”. /z9oPIJ=*  
    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 ) _Gv n1"l  
    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。 '#L.w6<B  
    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 .IXkdy  
    g. 点击OK (< gk<e*  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Z(k7&^d  
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    脚本代码  !*5vXN  
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    '#Language "WWB-COM" Hx5t![g2K!  
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    Option Explicit =^#^Mq)  
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    Sub Main ~\<aj(m(|  
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        'Cleanup 9x$Kb7'F  
        ClearOutputWindow() 1 w*DU9f  
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        Print "Merging RPC Photonics BSDF Data Files" @ W[LA<  
        SetTextColor(255,0,0) '[V}]Z>-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." X] cI ?  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ruiAEC<Ej  
        SetTextColor(0,0,0) $ReoIU^<  
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        'Current directory of this script (should be the same as the text files being merged) b}s)3=X@q  
        Dim cDir As String D; i%J  
        cDir = MacroDir$ & "\" ^FJ .C|l(  
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        'Array which will be populated with the list of files to be merged Y_S>S( 0  
        Dim fList() As String, curFile As String bLSXQStB  
        GetFileList( cDir, fList ) bruM#T@}  
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        Print "" C 0@tMB7  
        Print "Files found for merging:" gK7bP'S8H  
        For Each curFile In fList w=Cq v~  
            Print Chr(9) & curFile /1OzX'5f  
        Next !5FZxmUup  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $=) i{kGS@  
        Dim nameArray() As String, sampName As String o$ disJ  
        nameArray = Split(fList(0)," 0-0.txt") bUJ5j kZ)  
        sampName  = nameArray(0) UM[<v9NWE  
        Print "" p{c+ +P5  
        Print "Sample name: " & Chr(9) & sampName %uA\Le  
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        'Open an output file and write the FRED header data &\[3m^L  
        Dim outFile As String >d1gVBhk  
        outFile = cDir & sampName & "_FRED.txt" k(As^'>  
        Open outFile For Output As #1 Rd#V,[d  
        Print #1, "type bsdf_data" #*r u*  
        Print #1, "format angles=deg bsdf=value scale=1" e;_ cC7  
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        'Loop the file list, skip the two header lines and write the remaining data to file kta`[%KmIZ  
        Dim lineArray() As String, curLine As Long P01o:/}  
        For Each curFile In fList 8}5dyn{cvE  
            Print "Merging data from file " & curFile o'uv5asdb  
            ReadFile( cDir & curFile, lineArray ) k#*tf:R  
            For curLine = 2 To UBound(lineArray) <]9%Pm#X  
                Print #1, lineArray(curLine) Gn+3OI"  
            Next CY{`IZ  
        Next Nhq& Sn2  
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        'Close the output file e<Pbsj  
        Close #1 $%*E)~  
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        Print "Finished merging RPC data for sample " & sampName ` #!~+  
        Print "FRED formatted data file: " & Chr(9) & outFile \=kre+g  
    End Sub 6L`{oSX!  
    !sbKJ+V7  
    'Utility function to read the contents of a file into an array of strings. *&i SW~s  
    Function ReadFile(ByVal fileName As String, _ aN\ps g  
                      ByRef lineArray() As String) As Long bu&x& M*  
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        ReadFile = -1 ~[E@P1  
        Dim oFSO As Object Woo2hg-ti  
        Set oFSO = CreateObject("Scripting.FileSystemObject") H\Bh Af  
        Erase lineArray xUp[)B6?:  
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        Dim fid As Long )T4%}$(  
        If oFSO.fileexists( fileName ) Then oN0p$/La  
            fid = FreeFile() fa~u<m   
            Open fileName For Input As fid {u/G!{N$  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) >O7ITy  
            Close fid S}0W<H P  
        End If rkp 1tv  
        Set oFSO = Nothing C&d%S|:IR  
        Return UBound( lineArray ) h}vzZZ2,  
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    End Function N S^(5g  
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    Sub GetFileList( ByVal in_dir As String, _ @PYCl  
                     ByRef in_flist() As String ) T2;%@Ghc  
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        'Redimension the file list array  8(.DI/  
        Erase in_flist ah82S)a`}  
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        'Tracks how many files are found F W?zJ  
        Dim fCount As Long H<^*V8J 'w  
        fCount = 0 iG:9uDY  
    bp'qrcFuiL  
        'Recurse directory and search for text files I=N;F6  
        Dim f As String XxN=vL&m  
        f = Dir$(in_dir & "*.txt") VxlK:*t`  
        While f <> "" %SWtE5HZQq  
            ReDim Preserve in_flist(fCount) ;g-L2(T05;  
            in_flist(fCount) = f me-:A:si  
            fCount += 1 aWp9K+4R$/  
            f = Dir$() zjyj,jP  
        Wend r*-e~  
        ReDim Preserve in_flist(fCount-1) r6B\yH2  
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    End Sub 1l@gZI12#/  
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