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    [分享]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: 2020-12-15
    摘要 P-[6xu+]  
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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 8.Wf^j$+{  
    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。 W1M<6T.{7  
    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。 c&IIqT@Gb0  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 vL{sk|2&  
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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。 $S|bD$e  
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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) & ,2XrXiFu  
    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 HlgF%\@a+U  
    例如下所示: Hq"i0X m  
    Sample name:  EDF-C1-56 "zJ1vIZY  
    Merging data from file EDF-C1-56 0-0.txt 9a"[-B:  
    Finished merging RPC data for sample EDF-C1-56 pJ"Wg@+  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5Q,#Co  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D`,W1Z#  
    a. 创建一个新的散射库 QNJ )HNLp  
    b. 散射模型命名 1om:SHw  
    c. 改变散射模型为“Tabulated BSDF”. m^@,0\F  
    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 ) ,*%%BTnR  
    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。 F]@vmzr  
    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 :% )va  
    g. 点击OK -("sp  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \I1+J9Gl  
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    脚本代码 oOUL<ihe?  
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    '#Language "WWB-COM" ,IF3VE&r  
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    Option Explicit q+5g+9  
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    Sub Main <XiHQ B!  
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        'Cleanup gUwg\>UC  
        ClearOutputWindow() wP8Wx~Q=  
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        Print "Merging RPC Photonics BSDF Data Files" v8W.84e-  
        SetTextColor(255,0,0) ;D&FZ|`(u  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." EE(1;] d-  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 2'Cwx-_G`  
        SetTextColor(0,0,0) <0g.<n,  
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        'Current directory of this script (should be the same as the text files being merged) A^nB!veh  
        Dim cDir As String =v]\{ .  
        cDir = MacroDir$ & "\" 109dB$+$  
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        'Array which will be populated with the list of files to be merged }m0* w3  
        Dim fList() As String, curFile As String P~`gWGC}  
        GetFileList( cDir, fList ) | s%--W  
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        Print "" ad1I2  
        Print "Files found for merging:" m1H_kJ  
        For Each curFile In fList L|pMq!@J  
            Print Chr(9) & curFile #N9^C@  
        Next W{:^P0l  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _rt+OzZ*L  
        Dim nameArray() As String, sampName As String zrVw l\&  
        nameArray = Split(fList(0)," 0-0.txt") 2%P{fJbwd  
        sampName  = nameArray(0) ^=`7]E[p  
        Print "" +A%|.;  
        Print "Sample name: " & Chr(9) & sampName &0cfTb)dG  
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        'Open an output file and write the FRED header data ?_)b[-N!  
        Dim outFile As String /}A"F[5  
        outFile = cDir & sampName & "_FRED.txt" HO[W2b  
        Open outFile For Output As #1 t66Cx  
        Print #1, "type bsdf_data" /iURP-rl  
        Print #1, "format angles=deg bsdf=value scale=1" d1]CN6 7{G  
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        'Loop the file list, skip the two header lines and write the remaining data to file HR'sMu3  
        Dim lineArray() As String, curLine As Long " E+V >V+  
        For Each curFile In fList 5"5!\Zo  
            Print "Merging data from file " & curFile /2 z, ?,jL  
            ReadFile( cDir & curFile, lineArray ) =2v/f_  
            For curLine = 2 To UBound(lineArray) j"=F\S&!  
                Print #1, lineArray(curLine) kq|(t{@Rp  
            Next @'n07 5)h  
        Next @A32|p}  
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        'Close the output file =D-u".{  
        Close #1 wT\JA4  
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        Print "Finished merging RPC data for sample " & sampName 0 PEg `Wq  
        Print "FRED formatted data file: " & Chr(9) & outFile $O nh2 ^  
    End Sub -YvnX0j+  
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    'Utility function to read the contents of a file into an array of strings. {BV0Y.O  
    Function ReadFile(ByVal fileName As String, _ 5<64 C}fE3  
                      ByRef lineArray() As String) As Long RT C;Wj  
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        ReadFile = -1 JR6r3W  
        Dim oFSO As Object 709/'#- ^  
        Set oFSO = CreateObject("Scripting.FileSystemObject") g{ ()   
        Erase lineArray )+Gw Yt  
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        Dim fid As Long _43'W{%  
        If oFSO.fileexists( fileName ) Then P^'TI[\L9  
            fid = FreeFile() 'Fq +\J#%  
            Open fileName For Input As fid $'*q]]  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) j xc^OsYj  
            Close fid L5[{taZ,  
        End If ?iXN..6x  
        Set oFSO = Nothing KBC?SxJSJc  
        Return UBound( lineArray ) Gxhr0'  
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    End Function !d.bCE~  
    [?>\]  
    Sub GetFileList( ByVal in_dir As String, _ W 6c]a/  
                     ByRef in_flist() As String ) X!xmto  
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        'Redimension the file list array vKO/hZBh  
        Erase in_flist X+2uM+  
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        'Tracks how many files are found c-VIpA1  
        Dim fCount As Long }INj~d<:  
        fCount = 0 !jWE^@P/B  
    )4#YS$B$@)  
        'Recurse directory and search for text files )L/0X40<.  
        Dim f As String LWdA3%   
        f = Dir$(in_dir & "*.txt") WAt= T3  
        While f <> "" ]?G|:Kx$y%  
            ReDim Preserve in_flist(fCount) Ce/l[v  
            in_flist(fCount) = f q0C%">>1 #  
            fCount += 1 rnyXMt.q  
            f = Dir$() *^oL$_Y  
        Wend  Q}9!aB,  
        ReDim Preserve in_flist(fCount-1) oRZ98?Y\B  
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    End Sub fc&djd`FuX  
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