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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 x\YVB',h  
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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(#03w*C  
    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。 !wKiMgLS  
    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。 (*\y  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Is9.A_0h  
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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。 Bk5ft4v-  
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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) ^cuH\&&7  
    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 {*nE8+..A  
    例如下所示: 4G RHvA.  
    Sample name:  EDF-C1-56 Ii>#9>!F  
    Merging data from file EDF-C1-56 0-0.txt O mph(  
    Finished merging RPC data for sample EDF-C1-56 [YJ*zO  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V>ZDJW"G!  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >]2^5C;  
    a. 创建一个新的散射库 @.pr}S/  
    b. 散射模型命名 jH<,dG:{  
    c. 改变散射模型为“Tabulated BSDF”. LYTnMrM  
    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 ) kD6Iz$tr  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 bnV)f<  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ".?y!VY  
    g. 点击OK }xY|z"&  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GqgJ]m  
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    脚本代码 y|3!E>Up  
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    '#Language "WWB-COM" |RDE/  
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    Option Explicit _,w*Rv5=  
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    Sub Main =.,XJIw&  
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        'Cleanup Z 2lX^z  
        ClearOutputWindow() A[f `xE  
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        Print "Merging RPC Photonics BSDF Data Files" N8X)/W  
        SetTextColor(255,0,0) B9'2$s+Z;  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." mOFp!(  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." b)T6%2  
        SetTextColor(0,0,0) Gz7,g Y  
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        'Current directory of this script (should be the same as the text files being merged) iu{QHjZK(  
        Dim cDir As String <XzRRCYQ  
        cDir = MacroDir$ & "\" )7Oj  
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        'Array which will be populated with the list of files to be merged Qd}h:U^  
        Dim fList() As String, curFile As String 5'EoB^`8N~  
        GetFileList( cDir, fList ) pWKI^S  
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        Print "" T? ,Q=.  
        Print "Files found for merging:" P+,YWp  
        For Each curFile In fList nDNK}O~'  
            Print Chr(9) & curFile >,f5 5  
        Next E%$[*jZ  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7s;*vd>  
        Dim nameArray() As String, sampName As String t<cWMx5ra  
        nameArray = Split(fList(0)," 0-0.txt") pzU:AUW  
        sampName  = nameArray(0) F^Mt}`O  
        Print "" +Xmza8T9  
        Print "Sample name: " & Chr(9) & sampName v&`n}lS  
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        'Open an output file and write the FRED header data GA.cp*2 ~  
        Dim outFile As String +^a@U^V  
        outFile = cDir & sampName & "_FRED.txt" R I]x=  
        Open outFile For Output As #1 Hlj3z3  
        Print #1, "type bsdf_data" P}-S[[b73s  
        Print #1, "format angles=deg bsdf=value scale=1" '@#l/9  
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        'Loop the file list, skip the two header lines and write the remaining data to file PH!rWR  
        Dim lineArray() As String, curLine As Long yI's=Iu`  
        For Each curFile In fList R#/0}+-M  
            Print "Merging data from file " & curFile 'he&h4fm  
            ReadFile( cDir & curFile, lineArray ) kFi=^#J{  
            For curLine = 2 To UBound(lineArray) P2 +^7x?  
                Print #1, lineArray(curLine) /-g%IeF  
            Next Chtls;Ph[  
        Next mMad1qCi7  
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        'Close the output file JwUz4  
        Close #1 g+=f=5I3  
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        Print "Finished merging RPC data for sample " & sampName wodff_l  
        Print "FRED formatted data file: " & Chr(9) & outFile MUp{2_RA  
    End Sub a6g+"EcH#'  
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    'Utility function to read the contents of a file into an array of strings. ] -G~  
    Function ReadFile(ByVal fileName As String, _ QC+BEN$  
                      ByRef lineArray() As String) As Long d C6t+  
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        ReadFile = -1 <2PO3w?Z  
        Dim oFSO As Object Yk5Cyq  
        Set oFSO = CreateObject("Scripting.FileSystemObject") lAx8m't}6  
        Erase lineArray h>n<5{zqM  
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        Dim fid As Long R?l={N=Wf  
        If oFSO.fileexists( fileName ) Then 0EUC8Ni  
            fid = FreeFile() yzz(<s:o/  
            Open fileName For Input As fid s=)1:jY k  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) |A:+[35  
            Close fid m[&pR2T  
        End If |z.Ov&d4)(  
        Set oFSO = Nothing 9jrlB0  
        Return UBound( lineArray ) !,;/JxfgVh  
    ],Y+|uX->  
    End Function )>WSuf j  
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    Sub GetFileList( ByVal in_dir As String, _ ]q@W(\I  
                     ByRef in_flist() As String ) !*=+E%7  
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        'Redimension the file list array M!] g36h[  
        Erase in_flist :JG2xtn  
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        'Tracks how many files are found 1&JB@F9!  
        Dim fCount As Long mV'^4by  
        fCount = 0 [214b=  
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        'Recurse directory and search for text files N`!=z++G  
        Dim f As String #W=H)6  
        f = Dir$(in_dir & "*.txt") Xq.G vZS`  
        While f <> "" PD@@4@^  
            ReDim Preserve in_flist(fCount) 7a'@NgiGg  
            in_flist(fCount) = f RyN?Sn5)  
            fCount += 1 5\P3JoH:Yg  
            f = Dir$() 1$rrfg  
        Wend M9dUo7  
        ReDim Preserve in_flist(fCount-1) 8nHFNOv6  
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    End Sub #wZBWTj.  
     
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