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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: 2023-05-11
    摘要 5C/W_H+9iK  
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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 7=t4;8|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。 GFOd9=[  
    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。 [Z|R-{"  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤  Q0' xn  
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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。 jpZ, $  
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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) ./LD  
    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 |ul25/B B  
    例如下所示: pw*<tXH!  
    Sample name:  EDF-C1-56 TU{^/-l  
    Merging data from file EDF-C1-56 0-0.txt LFob1HH*8  
    Finished merging RPC data for sample EDF-C1-56 n1 `D:XrE  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt kD S  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 hm>JBc:n-  
    a. 创建一个新的散射库 Z9mY*}:U~  
    b. 散射模型命名 eKNZ?!c=  
    c. 改变散射模型为“Tabulated BSDF”. .{x-A{l  
    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 ) 7udMF3;>  
    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。  y|U3  
    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 9(DS"fgC  
    g. 点击OK I.TdYSB  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 EV| 6._Z(D  
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    脚本代码 e5_a.c  
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    '#Language "WWB-COM" DVt;I$  
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    Option Explicit $^?"/;8P5  
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    Sub Main }z1aKa9  
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        'Cleanup 0P^RciC f  
        ClearOutputWindow() xGTVC=q  
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        Print "Merging RPC Photonics BSDF Data Files" ED&>~~k)  
        SetTextColor(255,0,0) *ndXZ64  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." S/ )P&V%  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Hj't.lg+j  
        SetTextColor(0,0,0) p 9Zi}!  
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        'Current directory of this script (should be the same as the text files being merged) p'fq&a+  
        Dim cDir As String `"zXf-qeE  
        cDir = MacroDir$ & "\" +<7~yZ[Z8  
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        'Array which will be populated with the list of files to be merged TZ{';oU  
        Dim fList() As String, curFile As String e/JbRbZX  
        GetFileList( cDir, fList ) B-PN +P2  
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        Print "" r18eu B%  
        Print "Files found for merging:" V/"UDof  
        For Each curFile In fList 68JYA?  
            Print Chr(9) & curFile esU9  
        Next @dei} !e  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. NovF?kh2  
        Dim nameArray() As String, sampName As String ,Bax0p  
        nameArray = Split(fList(0)," 0-0.txt") P}hHx<L  
        sampName  = nameArray(0) LdnHz#  
        Print "" QG {KEj2V  
        Print "Sample name: " & Chr(9) & sampName #&<>|m  
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        'Open an output file and write the FRED header data  #v+ 2W  
        Dim outFile As String l =~EweuM  
        outFile = cDir & sampName & "_FRED.txt" Vc0C@*fVM  
        Open outFile For Output As #1 "j-Z<F]]  
        Print #1, "type bsdf_data" F!.Z@y P  
        Print #1, "format angles=deg bsdf=value scale=1" y,'M3GGl  
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        'Loop the file list, skip the two header lines and write the remaining data to file Z$ q{!aY  
        Dim lineArray() As String, curLine As Long h=h4`uA9  
        For Each curFile In fList *YH5kX  
            Print "Merging data from file " & curFile mU@pRjq=  
            ReadFile( cDir & curFile, lineArray ) _wMxKM  
            For curLine = 2 To UBound(lineArray) A)6xEeyR  
                Print #1, lineArray(curLine) :Z)a&A9v  
            Next %;S T7  
        Next ;PM(q<@\  
    !YX$4_I  
        'Close the output file mY6d+  
        Close #1 "LZQ1P*ef$  
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        Print "Finished merging RPC data for sample " & sampName \cJ?2^Eq  
        Print "FRED formatted data file: " & Chr(9) & outFile #o`y<1rN  
    End Sub V$wW?+V  
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    'Utility function to read the contents of a file into an array of strings. IBfLb(I  
    Function ReadFile(ByVal fileName As String, _ 8i$quHd&x  
                      ByRef lineArray() As String) As Long *iLlBE  
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        ReadFile = -1 u}_,4J  
        Dim oFSO As Object /`6Y-8e2  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 2IMU &  
        Erase lineArray s'$5]9$S  
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        Dim fid As Long 'k^d-Mh>h  
        If oFSO.fileexists( fileName ) Then S7oPdzcU-  
            fid = FreeFile() _{Z!$q6,  
            Open fileName For Input As fid Y=G9|7*lO  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) \e)>]C}h  
            Close fid rK` x<  
        End If v9*ugu[K9  
        Set oFSO = Nothing `G/%U~  
        Return UBound( lineArray ) BQWhTS7  
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    End Function AS1#_f C  
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    Sub GetFileList( ByVal in_dir As String, _ Z%&$_-yJ  
                     ByRef in_flist() As String ) |:7 ^  
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        'Redimension the file list array nR %ey"  
        Erase in_flist |ty?Ah,vb  
    :zA/~/Wo  
        'Tracks how many files are found L i g7Ac,  
        Dim fCount As Long 5r2A^<)  
        fCount = 0 y  J|/^qs  
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        'Recurse directory and search for text files pVm]<jO  
        Dim f As String `GDWy^-Q+!  
        f = Dir$(in_dir & "*.txt") 1>yh`Bp\=  
        While f <> "" EKgY  
            ReDim Preserve in_flist(fCount) jm ORKX+)  
            in_flist(fCount) = f fk*I}pDx  
            fCount += 1 Yamu"#  
            f = Dir$() ~`Y!_'(x  
        Wend eW<|I  
        ReDim Preserve in_flist(fCount-1) 6 4,('+  
    !l(D0 C  
    End Sub F>F2Yql&W  
     
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