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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 4L#q?]$  
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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 # JHicx\8l  
    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。 :9H=D^J  
    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。 4$9WJ ~V{  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 FC<aX[~&3  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Aa t _5p  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) P!yE{_%  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 `.Z MwA  
    例如下所示: 5 {cbcuG  
    Sample name:  EDF-C1-56 >#).3  
    Merging data from file EDF-C1-56 0-0.txt )G6{JL-I  
    Finished merging RPC data for sample EDF-C1-56 Dp|y&x!  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9:zW$Gt&  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 eqD|3YX  
    a. 创建一个新的散射库 bL\ab  
    b. 散射模型命名 :f (UZmV$  
    c. 改变散射模型为“Tabulated BSDF”. zr%2oFeX,  
    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 ) E O^j,x g  
    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。 ~i 'Ib_%h  
    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 h-u63b1"?  
    g. 点击OK BL1$ ~0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 }$5S@,  
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    脚本代码 c?oNKqPzg  
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    '#Language "WWB-COM" ^eke,,~  
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    Option Explicit (0/g)gW  
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    Sub Main @R% n &  
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        'Cleanup x*GGO)r  
        ClearOutputWindow() v|Y:'5`V  
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        Print "Merging RPC Photonics BSDF Data Files" "&(.Z(  
        SetTextColor(255,0,0) n$B SO  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 5e tbJk  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Wt=QCutt  
        SetTextColor(0,0,0) 2LS03 27  
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        'Current directory of this script (should be the same as the text files being merged) :D(4HXHK%  
        Dim cDir As String 297X).  
        cDir = MacroDir$ & "\" _7df(+.{<A  
    @H%)!f]zWt  
        'Array which will be populated with the list of files to be merged E`68Z/%  
        Dim fList() As String, curFile As String JL0>-kg  
        GetFileList( cDir, fList ) c*LB=;npI  
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        Print "" :u$nH9kwv  
        Print "Files found for merging:" ph*9,\c8  
        For Each curFile In fList Ni]V)wGE;  
            Print Chr(9) & curFile r(=  
        Next R5PXX&Q  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [-}LEH1[p  
        Dim nameArray() As String, sampName As String 0X6|pC~  
        nameArray = Split(fList(0)," 0-0.txt") D; xRgHn  
        sampName  = nameArray(0) <Uj~S  
        Print "" =[]V$<G'w{  
        Print "Sample name: " & Chr(9) & sampName G Y??q8  
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        'Open an output file and write the FRED header data XL9smFq  
        Dim outFile As String h"h3SD~  
        outFile = cDir & sampName & "_FRED.txt" (bpO>4(S  
        Open outFile For Output As #1 _}8hE v  
        Print #1, "type bsdf_data" 37C'knW  
        Print #1, "format angles=deg bsdf=value scale=1" Wp7lDx  
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        'Loop the file list, skip the two header lines and write the remaining data to file nymF`0HYe1  
        Dim lineArray() As String, curLine As Long ?#N: a  
        For Each curFile In fList o< )"\f/,  
            Print "Merging data from file " & curFile S#km`N`  
            ReadFile( cDir & curFile, lineArray ) p5RnFe l  
            For curLine = 2 To UBound(lineArray) aU&p7y4C@  
                Print #1, lineArray(curLine) kD_Ac{{<  
            Next ^y" #2Ov  
        Next SZVNu*G!H  
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        'Close the output file OH.lAF4E(  
        Close #1 IXjFK  
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        Print "Finished merging RPC data for sample " & sampName r 7 dwj  
        Print "FRED formatted data file: " & Chr(9) & outFile QT\||0V~p  
    End Sub c lhmpu  
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    'Utility function to read the contents of a file into an array of strings. {owXyQ2mK  
    Function ReadFile(ByVal fileName As String, _ 2bu,_<K.  
                      ByRef lineArray() As String) As Long rV6&:\  
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        ReadFile = -1 Z5x&P_.x[  
        Dim oFSO As Object @4)NxdOE  
        Set oFSO = CreateObject("Scripting.FileSystemObject") g=G>4Ua3  
        Erase lineArray :V,agAMn  
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        Dim fid As Long IKaa=r~  
        If oFSO.fileexists( fileName ) Then SSr#MIS?  
            fid = FreeFile() aMU0BS"   
            Open fileName For Input As fid FX1[ 2\  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) _E\Cm  
            Close fid <b JF&,  
        End If asEk 3  
        Set oFSO = Nothing o]R*6$  
        Return UBound( lineArray ) ?nf!s J'm  
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    End Function #BLx +mLq  
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    Sub GetFileList( ByVal in_dir As String, _ e4h9rF{Cxn  
                     ByRef in_flist() As String ) Py@/\V  
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        'Redimension the file list array ;!~&-I0l  
        Erase in_flist G'#f*) f  
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        'Tracks how many files are found _^%DfMP3i\  
        Dim fCount As Long OrC}WMhd  
        fCount = 0 MpNgp )%>  
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        'Recurse directory and search for text files ,1K`w:uhS  
        Dim f As String &~Hx!]uc  
        f = Dir$(in_dir & "*.txt") j^1Yz}6nR  
        While f <> "" W1;QPdz:  
            ReDim Preserve in_flist(fCount) @ajt D-_2  
            in_flist(fCount) = f VY#nSF`  
            fCount += 1 ;2y4^  
            f = Dir$() V|3^H^\5P  
        Wend .Qv H7  
        ReDim Preserve in_flist(fCount-1) <q`'[1Y4  
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    End Sub JGHQzC  
     
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