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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 8PWEQ<ev7>  
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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 c: (nlYZ   
    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。 6` Aw!&{  
    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。 cIrc@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 tZu1jBO_Q4  
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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。 ?},RN  
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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) I~;H'7|e  
    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 d[#@2  
    例如下所示: ;kT~&.,y  
    Sample name:  EDF-C1-56 *.Z~f"SZy*  
    Merging data from file EDF-C1-56 0-0.txt 91nw1c!  
    Finished merging RPC data for sample EDF-C1-56 a>Zp?*9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt J"TF@7{p  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 J93xxj  
    a. 创建一个新的散射库 !/=.~B  
    b. 散射模型命名 3e1P!^'\  
    c. 改变散射模型为“Tabulated BSDF”. C;.,+(G  
    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 ) & x_ #zN]  
    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。 !0F+qzGG7  
    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 p+d O w #  
    g. 点击OK 0Q)YZ2  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _KkP{g,Y  
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    脚本代码 S0}=uL#dt  
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    '#Language "WWB-COM" {w7/M]m-  
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    Option Explicit s'$2 }K  
    %.onO0})  
    Sub Main DgY !)cS  
    V)vik  
        'Cleanup 14 (sp  
        ClearOutputWindow() fPPmUM^C9  
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        Print "Merging RPC Photonics BSDF Data Files" sV\K[4HG  
        SetTextColor(255,0,0) | 68k9rq  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." <XN=v!2;  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "M3;>"`G  
        SetTextColor(0,0,0) /'b7q y  
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        'Current directory of this script (should be the same as the text files being merged) UM<s#t`\3  
        Dim cDir As String =%c\<<]aV  
        cDir = MacroDir$ & "\" $48 Z>ij?f  
    +_+j"BT  
        'Array which will be populated with the list of files to be merged `*U$pg  
        Dim fList() As String, curFile As String o"_'cNAz  
        GetFileList( cDir, fList ) %%zlqd"0  
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        Print "" Rd|8=`)  
        Print "Files found for merging:" ZY@ntV?  
        For Each curFile In fList J0oeCb  
            Print Chr(9) & curFile *[|+5LVn  
        Next &b7_%,Bx4  
    ]}p<P):hO  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. P{yb%@I~J  
        Dim nameArray() As String, sampName As String x":o*(rSQ  
        nameArray = Split(fList(0)," 0-0.txt") =O-irGms*  
        sampName  = nameArray(0) -'SA &[7dP  
        Print "" 6U.|0mG[  
        Print "Sample name: " & Chr(9) & sampName QR_h#N2h  
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        'Open an output file and write the FRED header data ;{q*  
        Dim outFile As String  ?r@^9  
        outFile = cDir & sampName & "_FRED.txt" =I@I  
        Open outFile For Output As #1 Ak8Y?#"wz  
        Print #1, "type bsdf_data" ! Dj2/][  
        Print #1, "format angles=deg bsdf=value scale=1" v"Ax'()  
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        'Loop the file list, skip the two header lines and write the remaining data to file VpSpj/\m)'  
        Dim lineArray() As String, curLine As Long _SJ:|I  
        For Each curFile In fList w6WPfy(/2  
            Print "Merging data from file " & curFile =:]v~Ehq  
            ReadFile( cDir & curFile, lineArray ) R&a$w8  
            For curLine = 2 To UBound(lineArray) T~(Sc'8  
                Print #1, lineArray(curLine) X 8R`C0   
            Next Lj9RF<39g  
        Next  o?m/  
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        'Close the output file ~BX=n9  
        Close #1 RtzSe$O  
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        Print "Finished merging RPC data for sample " & sampName ^gZ,A]  
        Print "FRED formatted data file: " & Chr(9) & outFile M +r!63T  
    End Sub : -d_  
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    'Utility function to read the contents of a file into an array of strings. `fTM/"  
    Function ReadFile(ByVal fileName As String, _ kS:#|yY8%  
                      ByRef lineArray() As String) As Long m!ueqV"  
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        ReadFile = -1 _#s,$K#  
        Dim oFSO As Object |K06H ?6X  
        Set oFSO = CreateObject("Scripting.FileSystemObject") kFV, Fg  
        Erase lineArray +38R#2JV  
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        Dim fid As Long \r[u>7I  
        If oFSO.fileexists( fileName ) Then /:' >-253  
            fid = FreeFile() rxH]'6kP  
            Open fileName For Input As fid i >s  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ,<r&] eC  
            Close fid ;'= cNj  
        End If e)g &q'O  
        Set oFSO = Nothing Mjy:k|aY"  
        Return UBound( lineArray ) mpMAhm:  
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    End Function d%"XsbO  
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    Sub GetFileList( ByVal in_dir As String, _ gJ'pwSA  
                     ByRef in_flist() As String ) d6YXITL)\>  
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        'Redimension the file list array Bhd)# P  
        Erase in_flist .'gm2  
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        'Tracks how many files are found U5OX.0  
        Dim fCount As Long pB 8D  
        fCount = 0 r(46jV.sD:  
    DylO;+  
        'Recurse directory and search for text files aQtd6L+ J  
        Dim f As String h<`aL;.g  
        f = Dir$(in_dir & "*.txt") `KFEzv  
        While f <> "" 4JAz{aw'b  
            ReDim Preserve in_flist(fCount) 7GYf#} N  
            in_flist(fCount) = f 2Jd(@DcJ2C  
            fCount += 1 !i^"3!.l,]  
            f = Dir$() *;Mi/^pzK  
        Wend VAz4@r7hkq  
        ReDim Preserve in_flist(fCount-1) LV^^Bd8Ct  
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    End Sub '|[V}K5m/f  
     
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