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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 z!eY=G'  
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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  &+u$96  
    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。 ?-Fp rC  
    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。 m@)K]0g<f  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Uk5jZ|  
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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。 $#1i@dI  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) d0eMDIm3R\  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ?u"MsnCXYn  
    例如下所示: 0 @~[SXR  
    Sample name:  EDF-C1-56 YeK PoW  
    Merging data from file EDF-C1-56 0-0.txt ,vl][MhM  
    Finished merging RPC data for sample EDF-C1-56 6*le(^y`  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt j-ZKEA{:1  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Q >] v?4  
    a. 创建一个新的散射库 " 8>*O;xk  
    b. 散射模型命名 kT t;3Ia  
    c. 改变散射模型为“Tabulated BSDF”. dr'#  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) '/G.^Zl9  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 P'xq+Q  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 x~rIr#o  
    g. 点击OK H[BY(a@c  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 vE^Hk!^  
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    脚本代码 ^W{+?q'  
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    '#Language "WWB-COM" qQv?J]l  
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    Option Explicit AtGk _tpVZ  
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    Sub Main B0T[[%~3M  
    [/.o>R#J(  
        'Cleanup -Xb]=Yf-  
        ClearOutputWindow() hlWTsi4N  
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        Print "Merging RPC Photonics BSDF Data Files" 3@f@4t@5V  
        SetTextColor(255,0,0) 2&S*> (  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." # XE`8$  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." x|&A^hQ  
        SetTextColor(0,0,0) l:5x*QSX  
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        'Current directory of this script (should be the same as the text files being merged) f$[6]7P  
        Dim cDir As String -}_-#L!Q  
        cDir = MacroDir$ & "\" x'tYf^Va28  
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        'Array which will be populated with the list of files to be merged -$yNJ5F`  
        Dim fList() As String, curFile As String t:X\`.W  
        GetFileList( cDir, fList ) S7vT=  
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        Print "" EW7heIT$  
        Print "Files found for merging:" rf?Q# KM\W  
        For Each curFile In fList Q[O[,Rk  
            Print Chr(9) & curFile q^ lx03   
        Next cPZD#";f  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. l( /yaZ`  
        Dim nameArray() As String, sampName As String Q{F*%X  
        nameArray = Split(fList(0)," 0-0.txt") >jMq-#*4  
        sampName  = nameArray(0) D^V0kC p!F  
        Print "" PZmg7N  
        Print "Sample name: " & Chr(9) & sampName Y).5(t7zaR  
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        'Open an output file and write the FRED header data J-yj&2  
        Dim outFile As String gI a/sD2m>  
        outFile = cDir & sampName & "_FRED.txt" Exd$v"s Y  
        Open outFile For Output As #1 g(){wCI  
        Print #1, "type bsdf_data" oju)8H1o#  
        Print #1, "format angles=deg bsdf=value scale=1" /<,LM8n  
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        'Loop the file list, skip the two header lines and write the remaining data to file #Ux*":  
        Dim lineArray() As String, curLine As Long !.9pV.~  
        For Each curFile In fList w],+lN;  
            Print "Merging data from file " & curFile X+2aP'D  
            ReadFile( cDir & curFile, lineArray ) Qvo(2(  
            For curLine = 2 To UBound(lineArray) szW_cjS  
                Print #1, lineArray(curLine) ~$xLR/{y  
            Next ~H"Q5Hr   
        Next e%. Xya#\  
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        'Close the output file ClZ:#uMbN  
        Close #1 gw[\7  
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        Print "Finished merging RPC data for sample " & sampName xDv5'IGBb  
        Print "FRED formatted data file: " & Chr(9) & outFile el GP2x#:  
    End Sub ]gI>ay"\QA  
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    'Utility function to read the contents of a file into an array of strings. 4pNIsjl}  
    Function ReadFile(ByVal fileName As String, _ 3>LyEXOW  
                      ByRef lineArray() As String) As Long d67Q@ ')00  
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        ReadFile = -1 n/*BK;  
        Dim oFSO As Object v[4A_WjT  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Zq wxi1  
        Erase lineArray FgA'X<  
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        Dim fid As Long TTB1}j+V6  
        If oFSO.fileexists( fileName ) Then IO/%X;Y_  
            fid = FreeFile() +|6 '7Z(9  
            Open fileName For Input As fid f44b=,Lry5  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 7g@P$e]  
            Close fid }2dz];bR  
        End If t [gz#'  
        Set oFSO = Nothing ,=o)R,[  
        Return UBound( lineArray ) s%Ez/or(T  
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    End Function x0aPY;,N0  
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    Sub GetFileList( ByVal in_dir As String, _ 9v[cy`\  
                     ByRef in_flist() As String ) :5 XNV6^|  
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        'Redimension the file list array .1F(-mLd  
        Erase in_flist Vf?+->-?{  
    XP#j9CF#.  
        'Tracks how many files are found `>M;f%s  
        Dim fCount As Long ki/xo^Y2<  
        fCount = 0 jY^wqQls  
    7)Zk:53]  
        'Recurse directory and search for text files q:Lw!'Z h  
        Dim f As String r2:n wlG  
        f = Dir$(in_dir & "*.txt") p4} ,xQzB  
        While f <> "" N 6CWEIJ  
            ReDim Preserve in_flist(fCount) G55-{y9Q  
            in_flist(fCount) = f ;O8Uc&:P  
            fCount += 1 j#KL"B_ A  
            f = Dir$() kaSi sjd  
        Wend w[g(8 #*  
        ReDim Preserve in_flist(fCount-1) f5)4H  
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    End Sub ym*,X@Qg^  
     
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