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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 WQ>y;fi5/{  
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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 y6C3u5`  
    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。 _)U[c;^6  
    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。 Ns}BE H  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 /+g9C(['  
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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。 7I0[Ii  
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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) <bbC &O\  
    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 \J0fr'(S  
    例如下所示: ;[,r./XmH  
    Sample name:  EDF-C1-56 Pv#>j\OR&  
    Merging data from file EDF-C1-56 0-0.txt [')C]YQb=  
    Finished merging RPC data for sample EDF-C1-56 c?H@HoF  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @cC@(M~Ru  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 '1r<g\ l  
    a. 创建一个新的散射库 jMV9r-{*+  
    b. 散射模型命名 lC AD $Ia~  
    c. 改变散射模型为“Tabulated BSDF”. ]b6gZ<  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) yy(.|  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q%Fa1h:2&  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 s`63 y&Z[  
    g. 点击OK 9-( \\$%  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )'3V4Z&  
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    脚本代码 8EBy5X}US  
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    '#Language "WWB-COM" u4QBD5T"  
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    Option Explicit n=8DC&  
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    Sub Main L7rH=gZ&!]  
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        'Cleanup 5%K(tRc|  
        ClearOutputWindow() (S)jV 0  
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        Print "Merging RPC Photonics BSDF Data Files" )ld`2) 4  
        SetTextColor(255,0,0) ^2 }p%j >  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." *< ?~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." W#sCvI@   
        SetTextColor(0,0,0) k0^t$J W  
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        'Current directory of this script (should be the same as the text files being merged) :)g}x&A^$  
        Dim cDir As String u`~,`z^{n  
        cDir = MacroDir$ & "\" mi& mQQ  
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        'Array which will be populated with the list of files to be merged agUdPl$e\  
        Dim fList() As String, curFile As String eX3|<Bf  
        GetFileList( cDir, fList ) FNy-&{P2  
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        Print "" 4E 0 Y=  
        Print "Files found for merging:" <[Y@<  
        For Each curFile In fList /)/>/4O  
            Print Chr(9) & curFile "Iu Pg=|#  
        Next <<~swN  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Fsi;[be$A  
        Dim nameArray() As String, sampName As String h'|J$   
        nameArray = Split(fList(0)," 0-0.txt") 5q95.rw  
        sampName  = nameArray(0) Cj1nll8c  
        Print "" m&{%6  
        Print "Sample name: " & Chr(9) & sampName ( *Fb/  
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        'Open an output file and write the FRED header data & T&>4I!'M  
        Dim outFile As String xI( t!aYp  
        outFile = cDir & sampName & "_FRED.txt" gl>%ADOB@  
        Open outFile For Output As #1 .0b4"0~T6  
        Print #1, "type bsdf_data" ;oGpB#[zO  
        Print #1, "format angles=deg bsdf=value scale=1" YX{c06BHs  
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        'Loop the file list, skip the two header lines and write the remaining data to file XZH\HK)K-]  
        Dim lineArray() As String, curLine As Long /pYp, ak  
        For Each curFile In fList ipH'}~=ID  
            Print "Merging data from file " & curFile dQ`=CIr  
            ReadFile( cDir & curFile, lineArray ) &{z RuF  
            For curLine = 2 To UBound(lineArray) i/{`rv*K[  
                Print #1, lineArray(curLine) ("txj[v-/  
            Next _4-UM2o;  
        Next ?v@pB>NZ  
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        'Close the output file :{'%I#k2  
        Close #1 Su*f`~G];  
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        Print "Finished merging RPC data for sample " & sampName .g8db d  
        Print "FRED formatted data file: " & Chr(9) & outFile _]6n]koD,  
    End Sub 8/BWe ;4  
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    'Utility function to read the contents of a file into an array of strings. `w K6B5>  
    Function ReadFile(ByVal fileName As String, _ zya2 O?s  
                      ByRef lineArray() As String) As Long wq = Ef  
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        ReadFile = -1 wNQhg  
        Dim oFSO As Object n1PV/ Z  
        Set oFSO = CreateObject("Scripting.FileSystemObject") AZf$XHP2  
        Erase lineArray 7 DW_G  
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        Dim fid As Long C|-QU  
        If oFSO.fileexists( fileName ) Then `g^bQ x  
            fid = FreeFile() DtglPo_(  
            Open fileName For Input As fid [I2vg<my  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) s]'EIw}mo  
            Close fid wHE1Jqpo  
        End If Qa@] sWcM  
        Set oFSO = Nothing R>y/Y<5=  
        Return UBound( lineArray ) QUK v :;  
    <}('w/  
    End Function "pTU&He  
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    Sub GetFileList( ByVal in_dir As String, _  kAnK1W>  
                     ByRef in_flist() As String ) B'8T+qvA  
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        'Redimension the file list array 0}qnq"  
        Erase in_flist u}eLf'^ZCe  
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        'Tracks how many files are found  Vl`!6.F3  
        Dim fCount As Long h)pYV>!d  
        fCount = 0 e!oL!Zg  
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        'Recurse directory and search for text files k<QZ_*x}G  
        Dim f As String <RJ+f-  
        f = Dir$(in_dir & "*.txt") aK?PK }@  
        While f <> "" TxvvCV^  
            ReDim Preserve in_flist(fCount) @r3,|tkrz  
            in_flist(fCount) = f qc"PTv0q  
            fCount += 1 tf4clzSTa  
            f = Dir$() $8WeWmY  
        Wend i<-a-Z+^  
        ReDim Preserve in_flist(fCount-1) Wo7`gf_(  
    \W+Hzf] W#  
    End Sub G0b##-.'^  
     
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