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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 k|)fl l  
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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 q ;'f3Y  
    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。 W r/-{Wt  
    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。 rz"$zc.)  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 C27:ty V  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 +x"uP  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) q?(] Y*  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 F^O83[S  
    例如下所示: ~gfR1SE  
    Sample name:  EDF-C1-56 D!&(#Vl _  
    Merging data from file EDF-C1-56 0-0.txt ]Btkoad  
    Finished merging RPC data for sample EDF-C1-56 KMRPleF  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sasurR|;  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |u&cN-}C d  
    a. 创建一个新的散射库 NHGTV$T`1  
    b. 散射模型命名 L|'^P3#7`  
    c. 改变散射模型为“Tabulated BSDF”. V"4Z9Qg}  
    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 ) Vx_33";S\  
    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。 [C "\]LiX  
    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 UPh#YV 0/,  
    g. 点击OK K!-OUm5A  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 <gp?}Lk  
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    脚本代码 xl\Kj2^  
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    '#Language "WWB-COM" 0* $w(*  
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    Option Explicit ,>  zEG  
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    Sub Main 8-2 `S*  
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        'Cleanup /'/I^ab  
        ClearOutputWindow() -R`{]7V  
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        Print "Merging RPC Photonics BSDF Data Files" .hl_zc#  
        SetTextColor(255,0,0) vi,hWz8WB  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." P\jGyS j  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." I~GF%$-G  
        SetTextColor(0,0,0) ZwmucY%3  
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        'Current directory of this script (should be the same as the text files being merged) Wc3z7xK1@  
        Dim cDir As String ;5Sdx5`_  
        cDir = MacroDir$ & "\" ?{ir$M  
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        'Array which will be populated with the list of files to be merged jJ ,_-ui  
        Dim fList() As String, curFile As String f O*jCl  
        GetFileList( cDir, fList ) S#/%#k103  
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        Print "" U.7fMc#  
        Print "Files found for merging:" * DL7p8  
        For Each curFile In fList lE:g A,  
            Print Chr(9) & curFile I.<c{4K5  
        Next ~66xO9s  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )kD/ 8  
        Dim nameArray() As String, sampName As String #z `W ,^C  
        nameArray = Split(fList(0)," 0-0.txt") t^rw@$"}  
        sampName  = nameArray(0) ?"B] "%M&  
        Print ""  F!omkN  
        Print "Sample name: " & Chr(9) & sampName !|cg=  
    ~ Z\:Nx  
        'Open an output file and write the FRED header data uDF;_bli)H  
        Dim outFile As String FcDS*ZEk!  
        outFile = cDir & sampName & "_FRED.txt" \(o"/*  
        Open outFile For Output As #1 9njwAKF?  
        Print #1, "type bsdf_data" kx"1 0Vw  
        Print #1, "format angles=deg bsdf=value scale=1" YDt+1Kw}D  
    )#=J<OpG  
        'Loop the file list, skip the two header lines and write the remaining data to file ?e7]U*jEU  
        Dim lineArray() As String, curLine As Long ^t;z;.g  
        For Each curFile In fList r~4uIUE{  
            Print "Merging data from file " & curFile J$dwy$n  
            ReadFile( cDir & curFile, lineArray ) yK~=6^M  
            For curLine = 2 To UBound(lineArray) [M?2axOC  
                Print #1, lineArray(curLine) p9(y b  
            Next 4fEDg{T  
        Next $XBK_ 5  
    ._mep\#.:  
        'Close the output file +X}i%F'  
        Close #1 GIC1]y-'  
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        Print "Finished merging RPC data for sample " & sampName 'D\Q$q  
        Print "FRED formatted data file: " & Chr(9) & outFile mgs(n5V5  
    End Sub JxAQ,oOO  
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    'Utility function to read the contents of a file into an array of strings. ()3\(d5e  
    Function ReadFile(ByVal fileName As String, _ #(8|9  
                      ByRef lineArray() As String) As Long bDI%}k9#  
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        ReadFile = -1 d=!:UB  
        Dim oFSO As Object ?1e{\XW  
        Set oFSO = CreateObject("Scripting.FileSystemObject") QLA.;`HIE  
        Erase lineArray c8RJOc4X  
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        Dim fid As Long O] _4pP  
        If oFSO.fileexists( fileName ) Then M`xiC  
            fid = FreeFile() eL!41_QI  
            Open fileName For Input As fid !40>LpL[  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~E<2gMKjO  
            Close fid s\ IKSoE  
        End If nla6QlFYn*  
        Set oFSO = Nothing e~'` x38  
        Return UBound( lineArray ) 2z.ot'  
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    End Function ZzT=m*tQ&  
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    Sub GetFileList( ByVal in_dir As String, _ :|7#D,2  
                     ByRef in_flist() As String ) eRauyL"Q+  
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        'Redimension the file list array d|`Ll  
        Erase in_flist zmMc*|  
    V7ph^^sC}  
        'Tracks how many files are found Uv^\[   
        Dim fCount As Long YFKE>+  
        fCount = 0 Fe+ @;  
    'j1e(wq  
        'Recurse directory and search for text files hy;VvAH 5  
        Dim f As String oFY!NMq}:  
        f = Dir$(in_dir & "*.txt") tF2"IP.  
        While f <> "" hbjAxioA  
            ReDim Preserve in_flist(fCount) c/{FDN  
            in_flist(fCount) = f 9g92eKS  
            fCount += 1 1^ iBS  
            f = Dir$() *O?c~UJhhV  
        Wend )P$(]{  
        ReDim Preserve in_flist(fCount-1) `i7r]  
    (FuIOR  
    End Sub $YYWpeW '  
     
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