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    [技术]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: 2023-05-11
    摘要 +S[3HX7H  
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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 ez.a  
    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。 8ZqLG a]  
    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|)b$H_  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 k3nvML,bv  
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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。 T:zM]%Xh  
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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) Gk/cP`  
    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 yP>025o't  
    例如下所示: 8D,*_p  
    Sample name:  EDF-C1-56 ,|}mo+rb-  
    Merging data from file EDF-C1-56 0-0.txt !lo /L  
    Finished merging RPC data for sample EDF-C1-56 {7c'%e  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^Y+Lf]zz*  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X{Hh^H  
    a. 创建一个新的散射库 M8<Vd1-5  
    b. 散射模型命名 _H@ATut  
    c. 改变散射模型为“Tabulated BSDF”. 5ya^k{`+ZO  
    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 ) |2@*?o"ll  
    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。 AO]cnh C  
    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 OXbShA&1  
    g. 点击OK @\XeRx;  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 DcdEt=\)h  
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    脚本代码 V$w lOMp  
    'L-DMNxBr  
    '#Language "WWB-COM" QkW'tU\^  
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    Option Explicit 3 V>$H\H  
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    Sub Main qP<D9k>  
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        'Cleanup gGUKB2)  
        ClearOutputWindow() >5:O%zQ@  
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        Print "Merging RPC Photonics BSDF Data Files" !|i #g$  
        SetTextColor(255,0,0) q~[s KAh  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ~IjID  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." \`xlD&F@U  
        SetTextColor(0,0,0) b=_k)h+l  
    F.5fasdX'  
        'Current directory of this script (should be the same as the text files being merged) DyiJ4m}kh  
        Dim cDir As String F]UH\1  
        cDir = MacroDir$ & "\" Q=fl!>P  
    xk% 62W  
        'Array which will be populated with the list of files to be merged )%MC*Z :^  
        Dim fList() As String, curFile As String Y$\|rD^f  
        GetFileList( cDir, fList ) ;l0 dx$w  
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        Print "" ],S {?!'1  
        Print "Files found for merging:" I 4?oBq  
        For Each curFile In fList 0V(}Zj>  
            Print Chr(9) & curFile ?z&%VU"  
        Next _UP fqC ?  
    ~"#HHaBO#  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ;%^=V#  
        Dim nameArray() As String, sampName As String LlO8]b!P-^  
        nameArray = Split(fList(0)," 0-0.txt") vQK/xg  
        sampName  = nameArray(0) ]lBCK  
        Print "" 0FI |7  
        Print "Sample name: " & Chr(9) & sampName [i ~qVn2vT  
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        'Open an output file and write the FRED header data h )5S4)  
        Dim outFile As String (H !iK,R  
        outFile = cDir & sampName & "_FRED.txt" ,:A;4  
        Open outFile For Output As #1 ">z3i`#C'  
        Print #1, "type bsdf_data" N\ !  
        Print #1, "format angles=deg bsdf=value scale=1" ChG7>4:\  
    p\ ;|Z+0=  
        'Loop the file list, skip the two header lines and write the remaining data to file CL4N/[UM  
        Dim lineArray() As String, curLine As Long %}VH5s9\  
        For Each curFile In fList p ZTrh&I]  
            Print "Merging data from file " & curFile s) shq3O  
            ReadFile( cDir & curFile, lineArray ) aYb97}kI  
            For curLine = 2 To UBound(lineArray) ;ISnI  
                Print #1, lineArray(curLine) 3yKmuu!  
            Next Tgr,1) T  
        Next 2icQ (H;  
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        'Close the output file 0zB[seyE  
        Close #1 O.(2  
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        Print "Finished merging RPC data for sample " & sampName r.\L@Y<  
        Print "FRED formatted data file: " & Chr(9) & outFile V)>?[  
    End Sub ngl +`|u  
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    'Utility function to read the contents of a file into an array of strings. uwSSrT  
    Function ReadFile(ByVal fileName As String, _ z m$Sw0#(  
                      ByRef lineArray() As String) As Long ^F+7<$ 2  
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        ReadFile = -1 P$#:$U @  
        Dim oFSO As Object kY~4AH  
        Set oFSO = CreateObject("Scripting.FileSystemObject") yEI@^8]s  
        Erase lineArray Ct w<-'  
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        Dim fid As Long i#`q<+/q  
        If oFSO.fileexists( fileName ) Then Oti*"dV\::  
            fid = FreeFile() Zob/H+]  
            Open fileName For Input As fid sjg`4^!wDD  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *kl  :/#  
            Close fid _NsEeKU  
        End If !{t|z=Qg  
        Set oFSO = Nothing Ey|_e3Lf[  
        Return UBound( lineArray ) f|~{j(.v  
    7PX`kI  
    End Function 3uqhYT;  
    d}h{#va*  
    Sub GetFileList( ByVal in_dir As String, _ =Nxkr0])!  
                     ByRef in_flist() As String ) Q S&B"7;g  
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        'Redimension the file list array 0+*NHiH  
        Erase in_flist >Q\Kc=Q|  
    TQF+aP8[L  
        'Tracks how many files are found EJ9hgE  
        Dim fCount As Long zXn-E  
        fCount = 0 :x*)o+  
    l[38cF  
        'Recurse directory and search for text files ,KW Q 6  
        Dim f As String |h\7Q1,1~2  
        f = Dir$(in_dir & "*.txt") S' j g#*$  
        While f <> "" [8i)/5D4  
            ReDim Preserve in_flist(fCount) `x9Eo4(/  
            in_flist(fCount) = f E[]5Od5#  
            fCount += 1 #hZ$ ;1.  
            f = Dir$() _{Kmj,q  
        Wend E+]9!fDy<  
        ReDim Preserve in_flist(fCount-1) kt/,& oKI  
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    End Sub l<`>  
     
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