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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 wsEOcaie  
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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 9-"!v0['  
    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。 V]5MIiNl  
    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。 $V\Dl]a1  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ^:u-wr8?{  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 5kik+  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) X#<+D1P  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ufn% sA  
    例如下所示: t\XA JU  
    Sample name:  EDF-C1-56 AaLbJYuKd  
    Merging data from file EDF-C1-56 0-0.txt ZKTY1JW_  
    Finished merging RPC data for sample EDF-C1-56 [:gp_Z&  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt MS`XhFPS.  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cb5T-'hY  
    a. 创建一个新的散射库 `rest_vu  
    b. 散射模型命名 _A~>?gJ;,  
    c. 改变散射模型为“Tabulated BSDF”. O<P(UT"  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ):]5WHYg  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 x8o/m$[,=u  
    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 /d*[za'0  
    g. 点击OK )8`i%2i=  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f7b6!R;z_  
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    脚本代码 mEg3.|  
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    '#Language "WWB-COM" jx#9  
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    Option Explicit Q%:Z&lg y  
    INEE 37%  
    Sub Main 5VSc5*[  
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        'Cleanup wlFK#iK  
        ClearOutputWindow() FA{'Ki`  
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        Print "Merging RPC Photonics BSDF Data Files" "^oU&]KQJ  
        SetTextColor(255,0,0) X#o<))  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." }ag;yf;  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 9\VV++}s>o  
        SetTextColor(0,0,0) Oe21noL  
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        'Current directory of this script (should be the same as the text files being merged) QIfP%,LT  
        Dim cDir As String aA]wFZ  
        cDir = MacroDir$ & "\" Pa'N)s<  
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        'Array which will be populated with the list of files to be merged b%].D(qBy  
        Dim fList() As String, curFile As String \c1>15  
        GetFileList( cDir, fList ) v0(_4U]/  
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        Print "" (6i4N2  
        Print "Files found for merging:" =@D H hg  
        For Each curFile In fList b!qlucA eE  
            Print Chr(9) & curFile _ BoA&Ism  
        Next 9&zQ 5L>  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. p }e| E!  
        Dim nameArray() As String, sampName As String j_.tg7X  
        nameArray = Split(fList(0)," 0-0.txt") TQykXZ2Yb)  
        sampName  = nameArray(0) ,<$rSvMfg  
        Print "" g"N&*V2  
        Print "Sample name: " & Chr(9) & sampName P('bnDU  
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        'Open an output file and write the FRED header data c`/kx  
        Dim outFile As String *xN?5u%  
        outFile = cDir & sampName & "_FRED.txt" to?={@$]  
        Open outFile For Output As #1 p*l=rni4  
        Print #1, "type bsdf_data" F_&H*kL L3  
        Print #1, "format angles=deg bsdf=value scale=1" LfJMSscfv  
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        'Loop the file list, skip the two header lines and write the remaining data to file dM-~Qo  
        Dim lineArray() As String, curLine As Long hcz!f  
        For Each curFile In fList Rq`5ff3,  
            Print "Merging data from file " & curFile j Y(|z*|  
            ReadFile( cDir & curFile, lineArray ) )2 b-3lz  
            For curLine = 2 To UBound(lineArray) E)|Bl>  
                Print #1, lineArray(curLine) e-nwR  
            Next y,K> Wb9e  
        Next I|Mw*2U  
    _YN C}PUU  
        'Close the output file (C.aQ)|T  
        Close #1 :m36{#  
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        Print "Finished merging RPC data for sample " & sampName %r&36d'  
        Print "FRED formatted data file: " & Chr(9) & outFile 2cwJ);Eg2  
    End Sub Ya-GDB;L  
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    'Utility function to read the contents of a file into an array of strings. "bz.nE*  
    Function ReadFile(ByVal fileName As String, _ "N)InPR-  
                      ByRef lineArray() As String) As Long -C8LM ls  
    )@<HG$#  
        ReadFile = -1 0<##8m@F8  
        Dim oFSO As Object ZG? e%  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ],{M``]q  
        Erase lineArray cC]]H&'Hg+  
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        Dim fid As Long P.jy7:dB,  
        If oFSO.fileexists( fileName ) Then Wz#ZkNO  
            fid = FreeFile() Ec^2tx"=  
            Open fileName For Input As fid P76gJ@#m  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) >qUD_U3A  
            Close fid "rVM23@ tq  
        End If &*oljGt8  
        Set oFSO = Nothing xe9\5Gb}  
        Return UBound( lineArray ) }h* j{b,  
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    End Function I}m>t}QRI_  
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    Sub GetFileList( ByVal in_dir As String, _ Ocz21gl-?`  
                     ByRef in_flist() As String ) nU0##  
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        'Redimension the file list array Wys$#pJ  
        Erase in_flist Kjpsz];  
    t gHN\@yj  
        'Tracks how many files are found 5DO}&%.xt  
        Dim fCount As Long %Aa_Bumf*:  
        fCount = 0 qQ1D}c@  
    eu?P6>urA  
        'Recurse directory and search for text files O&}R  
        Dim f As String T5}5uk9  
        f = Dir$(in_dir & "*.txt") t3C#$ >  
        While f <> "" ,Ek6X)|@  
            ReDim Preserve in_flist(fCount) %NfH`%`  
            in_flist(fCount) = f ;F"Tu  
            fCount += 1 .4[M-@4+]  
            f = Dir$() ?}S!8;d  
        Wend T'9M  
        ReDim Preserve in_flist(fCount-1) "{3MXAFe  
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    End Sub :9(w~bB9$  
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