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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 *Zk>2<^R  
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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 #-VMg+14  
    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。 4u;9J*r4  
    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。 <UP m=Hb  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 =8Jfgq9E  
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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。 1T&Rc4$Sn7  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) v X~RP *  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 #N(= 3Cj  
    例如下所示: /^SAC%PD  
    Sample name:  EDF-C1-56 "ww|&-W9  
    Merging data from file EDF-C1-56 0-0.txt 796\jf$  
    Finished merging RPC data for sample EDF-C1-56 *iO u'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt d[^KL;b?6  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jzji&A~  
    a. 创建一个新的散射库 MM_k ]-7  
    b. 散射模型命名 ?t&kb7  
    c. 改变散射模型为“Tabulated BSDF”. <*ZJaBwWU~  
    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 ) `:8J46or  
    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。 {PP9$>4`l  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 a]17qMl  
    g. 点击OK )> ,wj  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值  5^<h}u9  
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    脚本代码 1J=.N|(@Q  
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    '#Language "WWB-COM" -H^oXeN  
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    Option Explicit N[]Hc  
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    Sub Main )~4II.`%^  
    /n~\\9#3  
        'Cleanup :NHH Dl  
        ClearOutputWindow() 9O` m,t  
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        Print "Merging RPC Photonics BSDF Data Files" 5,qj7HZF  
        SetTextColor(255,0,0) d<!3`qe  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." /tV/85r  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ? &G`{Ey  
        SetTextColor(0,0,0) H&1[n U{?>  
    N7'OPTKt&  
        'Current directory of this script (should be the same as the text files being merged) M#"524Nz  
        Dim cDir As String AqK z$  
        cDir = MacroDir$ & "\" v 8T$ &-HJ  
    0N[&3Ee8  
        'Array which will be populated with the list of files to be merged (Fq5IGs  
        Dim fList() As String, curFile As String K 8n4oz#z  
        GetFileList( cDir, fList ) T{V/+RM  
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        Print "" Y$N)^=7  
        Print "Files found for merging:" H gTUy[(  
        For Each curFile In fList 2" |2a@  
            Print Chr(9) & curFile 0&qr  
        Next UNijFGi  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. gmIqT f  
        Dim nameArray() As String, sampName As String pi=-#g(2  
        nameArray = Split(fList(0)," 0-0.txt") l Z#o+d2Y  
        sampName  = nameArray(0) )1N 54FNO  
        Print "" (8v7|Pe8  
        Print "Sample name: " & Chr(9) & sampName 8^Hn"v  
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        'Open an output file and write the FRED header data ;^*Unyt[4]  
        Dim outFile As String hjaT^(Y  
        outFile = cDir & sampName & "_FRED.txt" ]\/tVn.'  
        Open outFile For Output As #1 mNmLyU=d  
        Print #1, "type bsdf_data" u` oq(?|  
        Print #1, "format angles=deg bsdf=value scale=1" o]nw0q?  
    "UEv&mQ  
        'Loop the file list, skip the two header lines and write the remaining data to file D9`0Dr}/2  
        Dim lineArray() As String, curLine As Long x~.:64  
        For Each curFile In fList F+E|r6'i  
            Print "Merging data from file " & curFile KIR'$ 6pn~  
            ReadFile( cDir & curFile, lineArray ) T+N|R  
            For curLine = 2 To UBound(lineArray)  O+%WR  
                Print #1, lineArray(curLine) uB!kM  
            Next | 8qBm  
        Next Q{k At%  
    )p!7 #v/@f  
        'Close the output file 4w#``UY)'  
        Close #1 J=pztASt  
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        Print "Finished merging RPC data for sample " & sampName {Fzs@,|W.  
        Print "FRED formatted data file: " & Chr(9) & outFile jV(6>BAI_  
    End Sub Zy|Mz&  
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    'Utility function to read the contents of a file into an array of strings. P&Pj>!T5  
    Function ReadFile(ByVal fileName As String, _ rr#K"SP  
                      ByRef lineArray() As String) As Long hFiIW77 s2  
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        ReadFile = -1 Lm@vXgMD  
        Dim oFSO As Object )'*5R<#  
        Set oFSO = CreateObject("Scripting.FileSystemObject") hJzxbr <  
        Erase lineArray LH:i| I  
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        Dim fid As Long oI^4pwnh  
        If oFSO.fileexists( fileName ) Then Oy 2+b1{  
            fid = FreeFile() tzy'G"P|  
            Open fileName For Input As fid `/HUV&i"S  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) %pXAeeSY`;  
            Close fid cBo{/Tn:  
        End If [:^-m8QC  
        Set oFSO = Nothing 0rGSH*(  
        Return UBound( lineArray )  JHf  
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    End Function 5OoN!TEM  
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    Sub GetFileList( ByVal in_dir As String, _ Z}|(F RVk  
                     ByRef in_flist() As String ) &W f3~hmo  
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        'Redimension the file list array &Q}*+Y]G  
        Erase in_flist )[1)$-Ru  
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        'Tracks how many files are found tgjr&G}a@0  
        Dim fCount As Long z&V+#Ws/  
        fCount = 0 PvGDTYcKp  
    T97]P-}  
        'Recurse directory and search for text files |Yq$s U  
        Dim f As String t%530EB3  
        f = Dir$(in_dir & "*.txt") M>M`baM1  
        While f <> "" zD3mX<sw  
            ReDim Preserve in_flist(fCount) &YDK (&>  
            in_flist(fCount) = f 0euuT@_$  
            fCount += 1 V'w@rc\XN  
            f = Dir$() kh%{C] ".1  
        Wend ?YeWH WM  
        ReDim Preserve in_flist(fCount-1) D~o$GW%  
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    End Sub OLI$1d_  
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