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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: 2025-07-22
    摘要 `:fZ)$sY  
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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 Xf]d. :  
    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。 =%K;X\NB  
    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。 z6\UGSL  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 K&]G3W%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。 {*" |#6-  
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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) *I.f1lz%*  
    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 CNyIQ}NJ  
    例如下所示: zT]8KA   
    Sample name:  EDF-C1-56 s?}e^/"v  
    Merging data from file EDF-C1-56 0-0.txt (k.[GfCbD  
    Finished merging RPC data for sample EDF-C1-56 hBUn \~z  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ]y '>=a|T  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 b94DJzL1z  
    a. 创建一个新的散射库 $szqy?i 0?  
    b. 散射模型命名 B%b4v  
    c. 改变散射模型为“Tabulated BSDF”. L|xbR#v  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) -<!NXm|kvz  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 I3I/bofz  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ;bib/  
    g. 点击OK 7(8;t o6(  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 5c0 ZRV#  
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    脚本代码 HyZqUb Ha  
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    '#Language "WWB-COM" k$R-#f;  
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    Option Explicit xs bE TP?  
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    Sub Main `?_Q5lp/s  
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        'Cleanup d.d/<  
        ClearOutputWindow() q dBrQC  
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        Print "Merging RPC Photonics BSDF Data Files" ChPmX+.i_  
        SetTextColor(255,0,0) l'.VKh\C  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." b9HtR-iR;  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." WlC:l  
        SetTextColor(0,0,0) ZDYJ\}=  
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        'Current directory of this script (should be the same as the text files being merged) 6Y?|w3f   
        Dim cDir As String IK=a*}19L  
        cDir = MacroDir$ & "\" q ^N7 I@Y  
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        'Array which will be populated with the list of files to be merged c9 _ rmz8  
        Dim fList() As String, curFile As String |FZ/[9*  
        GetFileList( cDir, fList ) 9F;>W ET  
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        Print "" BG]#o| KW  
        Print "Files found for merging:" "_NN3lD)X  
        For Each curFile In fList C1n>M}b  
            Print Chr(9) & curFile 1 bU,$4  
        Next @,my7?::oM  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ZG8DIV\D7  
        Dim nameArray() As String, sampName As String kv{za4,&  
        nameArray = Split(fList(0)," 0-0.txt") 0-Ku7<a  
        sampName  = nameArray(0) )g%d:xI  
        Print "" Flm%T-Dl  
        Print "Sample name: " & Chr(9) & sampName @:vwb\azVD  
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        'Open an output file and write the FRED header data KU(&%|;g  
        Dim outFile As String 'S&zCTX7j  
        outFile = cDir & sampName & "_FRED.txt" Y)2,PES=  
        Open outFile For Output As #1 Moza".fiN  
        Print #1, "type bsdf_data" 7.j?U  
        Print #1, "format angles=deg bsdf=value scale=1" '-XXo=>0MV  
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        'Loop the file list, skip the two header lines and write the remaining data to file ;$wVu|&  
        Dim lineArray() As String, curLine As Long N5 6g+,w%)  
        For Each curFile In fList 0IBSRFt$g&  
            Print "Merging data from file " & curFile ?1 4{J]H4  
            ReadFile( cDir & curFile, lineArray ) N<VJ(20y  
            For curLine = 2 To UBound(lineArray) ?NsW|w_  
                Print #1, lineArray(curLine) })Vi  
            Next xY(*.T9K  
        Next 0GCEqQy8  
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        'Close the output file &B1WtW  
        Close #1 9qzHS~l  
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        Print "Finished merging RPC data for sample " & sampName SoK iE  
        Print "FRED formatted data file: " & Chr(9) & outFile [sj osV  
    End Sub `b7t4d*  
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    'Utility function to read the contents of a file into an array of strings. `|& O*`  
    Function ReadFile(ByVal fileName As String, _ meO:@Z0  
                      ByRef lineArray() As String) As Long 7~.9=I'A  
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        ReadFile = -1 W.KDVE$}f  
        Dim oFSO As Object 8'io$ 6d=  
        Set oFSO = CreateObject("Scripting.FileSystemObject") TKmf+ZT*r  
        Erase lineArray "J_9WUN  
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        Dim fid As Long >U27];}y  
        If oFSO.fileexists( fileName ) Then tl^9WG  
            fid = FreeFile() $B5aje}i  
            Open fileName For Input As fid i$ 6ypuc  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) cIOlhX@  
            Close fid 9EibIOD^/  
        End If sS'm!7*(3  
        Set oFSO = Nothing .|i.Cq8  
        Return UBound( lineArray ) R8Fv{7]c  
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    End Function @<EO`L)Z  
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    Sub GetFileList( ByVal in_dir As String, _ x7<K<k;s  
                     ByRef in_flist() As String ) u <v7;dF|s  
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        'Redimension the file list array mtcw#D  
        Erase in_flist d S V8q ,D  
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        'Tracks how many files are found T'Dv.h  
        Dim fCount As Long v O_*yh1  
        fCount = 0 2.%ITB  
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        'Recurse directory and search for text files w@w(-F!%l  
        Dim f As String >7DhTM-A  
        f = Dir$(in_dir & "*.txt") Fd9 [pU  
        While f <> "" z1X`o  
            ReDim Preserve in_flist(fCount) A;?|& `f  
            in_flist(fCount) = f s&3Vg7B  
            fCount += 1 suDQ~\ n  
            f = Dir$() di )L[<$DY  
        Wend Em~>9f ?Q(  
        ReDim Preserve in_flist(fCount-1) ri-b=|h2j  
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    End Sub $kp{Eg '  
     
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