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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 4q#6.E;yy  
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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 jqxeON  
    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。 amq]&.M  
    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。 =!7k/n';  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 RG/M-  
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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。 &No6k~T0:b  
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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) ^2E\{$J  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ry9%Y3  
    例如下所示: 3a PCi>i!_  
    Sample name:  EDF-C1-56 :e>y= s>  
    Merging data from file EDF-C1-56 0-0.txt WNSf$D{p  
    Finished merging RPC data for sample EDF-C1-56 cF!ygz//  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Nq'Cuwsp  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h(]aP<49L  
    a. 创建一个新的散射库 4cJ7W_ >i6  
    b. 散射模型命名 H59}d oKH  
    c. 改变散射模型为“Tabulated BSDF”. +c4]}9f!  
    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 ) y<mmv~=  
    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。 FEj{/  
    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 *i zPLM}+  
    g. 点击OK O="# yE)  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 j`jF{k b  
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    脚本代码 N,U<.{T=A  
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    '#Language "WWB-COM" L rV`P)$T  
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    Option Explicit 4_qd5K+n"  
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    Sub Main g4USKJ19.  
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        'Cleanup >zcR ?PPs  
        ClearOutputWindow() iu!j#VO  
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        Print "Merging RPC Photonics BSDF Data Files" mU.(aL HW  
        SetTextColor(255,0,0) Zwj\Hz.  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 0'u2xe  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." t\44 Pu%  
        SetTextColor(0,0,0) ~lO^ C  
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        'Current directory of this script (should be the same as the text files being merged) dL;C4[(N  
        Dim cDir As String oE:9}]N_  
        cDir = MacroDir$ & "\" MX!t/&X(n  
    } LuPYCzpu  
        'Array which will be populated with the list of files to be merged !14aw9Q  
        Dim fList() As String, curFile As String (iM*Y"Y  
        GetFileList( cDir, fList ) UHr0J jQK  
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        Print "" <aps)vF  
        Print "Files found for merging:" L3[r7 b  
        For Each curFile In fList Q/[|/uNw?  
            Print Chr(9) & curFile rPaUDR4U  
        Next FPj j1U`C  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. MZp`  
        Dim nameArray() As String, sampName As String YC!Tgb~H  
        nameArray = Split(fList(0)," 0-0.txt") pw;  
        sampName  = nameArray(0) 7_t\wmvYp  
        Print "" lq0@)'D  
        Print "Sample name: " & Chr(9) & sampName ul[edp_  
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        'Open an output file and write the FRED header data x3ds{Z$,>(  
        Dim outFile As String p.{9OrH(4  
        outFile = cDir & sampName & "_FRED.txt" ?VC[%sjwn  
        Open outFile For Output As #1 vY|{CBGbd  
        Print #1, "type bsdf_data" eu!B ,  
        Print #1, "format angles=deg bsdf=value scale=1" s;oDwT1  
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        'Loop the file list, skip the two header lines and write the remaining data to file -h=K]Y{`  
        Dim lineArray() As String, curLine As Long _@U?;73"5  
        For Each curFile In fList vrVb/hhG  
            Print "Merging data from file " & curFile :N!Fe7H,  
            ReadFile( cDir & curFile, lineArray ) +E.}k!y  
            For curLine = 2 To UBound(lineArray) q2Xm~uN`)  
                Print #1, lineArray(curLine) $`7cs}#  
            Next  P%#WeQ+  
        Next Pl|e?Np  
    ;O7CahdF  
        'Close the output file s^5KFK1  
        Close #1 R7~H}>uaF  
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        Print "Finished merging RPC data for sample " & sampName &Xr@nt0H  
        Print "FRED formatted data file: " & Chr(9) & outFile w74 )kIi  
    End Sub -]8cw#y 0A  
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    'Utility function to read the contents of a file into an array of strings. 7.hgne'<  
    Function ReadFile(ByVal fileName As String, _ ?.E ixGzI^  
                      ByRef lineArray() As String) As Long _TF\y@hF*D  
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        ReadFile = -1 X$"=\p>X  
        Dim oFSO As Object jKFypIZ4  
        Set oFSO = CreateObject("Scripting.FileSystemObject") C>%2'S^.b  
        Erase lineArray S`,(10Y  
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        Dim fid As Long 8Ar5^.k  
        If oFSO.fileexists( fileName ) Then Jjt'R`t%t  
            fid = FreeFile() G2#={g{  
            Open fileName For Input As fid CV/ei,=9  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ` VL`8  
            Close fid 4F_*,_Y  
        End If nCMv&{~  
        Set oFSO = Nothing i <KWFF#  
        Return UBound( lineArray ) 88fH !6b  
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    End Function 3#)I7FG  
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    Sub GetFileList( ByVal in_dir As String, _ z+ybtS>pZ  
                     ByRef in_flist() As String ) . J"g.Q  
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        'Redimension the file list array KA)9&6  
        Erase in_flist 8K qrB!  
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        'Tracks how many files are found j$l[OZ:#  
        Dim fCount As Long W,</  
        fCount = 0 rLMjN#`^  
    tb;!2$  
        'Recurse directory and search for text files U1pL `P1  
        Dim f As String w2B If[~t  
        f = Dir$(in_dir & "*.txt") V!!E)I  
        While f <> "" j{)_&|^{  
            ReDim Preserve in_flist(fCount) 21Z}Zj  
            in_flist(fCount) = f nic7RN?F<  
            fCount += 1 CXqU< a&  
            f = Dir$() R~40,$e{  
        Wend plL##?<D<  
        ReDim Preserve in_flist(fCount-1) m/#)B6@A  
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    End Sub nSxFz!  
     
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