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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 c(_oK ?  
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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 utFcFd X  
    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。 J*^,l`C/  
    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。 32)&;  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 @wAr[.lZ  
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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。 sJjl)Qs)T  
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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) 8h@)9Q]d\  
    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 r['=a/.C  
    例如下所示: ,h5-rw'  
    Sample name:  EDF-C1-56 5,=B1  
    Merging data from file EDF-C1-56 0-0.txt ^8f|clw"  
    Finished merging RPC data for sample EDF-C1-56 *Wuctu^9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt nIN%<3U2  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NdXy% Q  
    a. 创建一个新的散射库 QB.*R?A  
    b. 散射模型命名 e{rHO,#A>  
    c. 改变散射模型为“Tabulated BSDF”. 4Q`=t &u  
    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 ) q!9v}R3(  
    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。 \4`saM /x  
    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 JK^B+.  
    g. 点击OK bTo@gJk n  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Zc' >}X[G  
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    脚本代码 )2^/?jK  
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    '#Language "WWB-COM" 2*7s 9g  
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    Option Explicit 61Iy{-/ZV  
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    Sub Main UV *tO15i  
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        'Cleanup V~uA(3\U  
        ClearOutputWindow() p?`|CE@h7  
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        Print "Merging RPC Photonics BSDF Data Files" ]Buk9LTe  
        SetTextColor(255,0,0) lWyP[>*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." JXy667_  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." uB#B\i  
        SetTextColor(0,0,0) pTV@nP  
    4f@\f7 \  
        'Current directory of this script (should be the same as the text files being merged) 5, "^"*@<  
        Dim cDir As String {'K;aJ'\  
        cDir = MacroDir$ & "\" {;(g[H=q;  
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        'Array which will be populated with the list of files to be merged 5z(>4d!  
        Dim fList() As String, curFile As String 1n5e^'z  
        GetFileList( cDir, fList ) h C`p<jp/  
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        Print "" XL&eJ  
        Print "Files found for merging:" Fi3(glgd-  
        For Each curFile In fList \$\(9!=  
            Print Chr(9) & curFile {msB+n~WZ  
        Next !L.z4n,n+  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. u1|Y;*  
        Dim nameArray() As String, sampName As String ZWe$(?  
        nameArray = Split(fList(0)," 0-0.txt") $O</akn;  
        sampName  = nameArray(0) Ckl]fy@D}  
        Print "" A)p! w aG  
        Print "Sample name: " & Chr(9) & sampName s8I77._s  
    !=Vh2UbC3  
        'Open an output file and write the FRED header data w!h{P38  
        Dim outFile As String 3SB7)8Id1  
        outFile = cDir & sampName & "_FRED.txt" _<~Vxz9  
        Open outFile For Output As #1 :tDGNz*zG  
        Print #1, "type bsdf_data" /s0VyUV=  
        Print #1, "format angles=deg bsdf=value scale=1" q\pc2Lh?^  
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        'Loop the file list, skip the two header lines and write the remaining data to file x)sDf!d4bi  
        Dim lineArray() As String, curLine As Long *x` l1o  
        For Each curFile In fList 7X3l&J2C4l  
            Print "Merging data from file " & curFile [x()^{;2  
            ReadFile( cDir & curFile, lineArray ) ^@w1Z{:  
            For curLine = 2 To UBound(lineArray) |0 pBBDw  
                Print #1, lineArray(curLine) NU\t3JaR  
            Next $gtT5{"PN(  
        Next Z5^ UF2`Q  
    /(L1!BPP9m  
        'Close the output file g_!xO2LH,8  
        Close #1 .BTT*vL-  
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        Print "Finished merging RPC data for sample " & sampName &aht K}u  
        Print "FRED formatted data file: " & Chr(9) & outFile \Nn%*?f  
    End Sub w`Aw+[24  
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    'Utility function to read the contents of a file into an array of strings. :[?o7%"  
    Function ReadFile(ByVal fileName As String, _ &T.P7nJ=  
                      ByRef lineArray() As String) As Long rpI7W?hh  
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        ReadFile = -1 g/Nj|:3  
        Dim oFSO As Object mZ&Mj.0+~  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ]6 7wk  
        Erase lineArray 83(P_Y:  
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        Dim fid As Long I8>1RXz  
        If oFSO.fileexists( fileName ) Then b#'a4j-u  
            fid = FreeFile() ] ]-0RJ=S?  
            Open fileName For Input As fid H~K2`Cr)4  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) x%7x^]$  
            Close fid ]b$,.t5  
        End If ~ a&j4E  
        Set oFSO = Nothing Yx/~8K_%M?  
        Return UBound( lineArray ) 'bO? =+c  
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    End Function ;lt;]7  
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    Sub GetFileList( ByVal in_dir As String, _ ^0~1/ PhOw  
                     ByRef in_flist() As String ) a5S/ O;ry  
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        'Redimension the file list array xeh|u"5  
        Erase in_flist v0J1%{/xs  
    ';V+~pi  
        'Tracks how many files are found 6Ky"4\e  
        Dim fCount As Long daNIP1Qn  
        fCount = 0 2DQC)Pe+z  
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        'Recurse directory and search for text files #-,`4x$m|  
        Dim f As String 1mM52q.R4  
        f = Dir$(in_dir & "*.txt") ]TOY_K8"z#  
        While f <> "" D:,<9%A  
            ReDim Preserve in_flist(fCount) &Wk<F3qN  
            in_flist(fCount) = f =h!m/f^x  
            fCount += 1 #| Po&yu4R  
            f = Dir$() A*i_- ;W)  
        Wend zvj >KF|y  
        ReDim Preserve in_flist(fCount-1) J[AgOUc  
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    End Sub )Ggx  
     
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