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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 (V#5Cs,o:  
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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 54v}iG  
    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。 Tw 8$6KUW  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 z`XX[9$qm  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 &Yb!j  
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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。 | <gYzb q  
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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) _ ZMoPEW  
    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 'a[|'  
    例如下所示: O!#r2Y"?K1  
    Sample name:  EDF-C1-56 C8ek{o)%W  
    Merging data from file EDF-C1-56 0-0.txt JYc;6p$<i  
    Finished merging RPC data for sample EDF-C1-56 *d b,N'rK  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt G*^4+^Vz?  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >8PGyc*9  
    a. 创建一个新的散射库 V^apDV\AV  
    b. 散射模型命名 DxoW,G W  
    c. 改变散射模型为“Tabulated BSDF”. 54r/s#|-3  
    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 ) $bOiP  
    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。 aYW 9 C<5  
    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 OO#_ 0qK  
    g. 点击OK '*lVVeSiFw  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^ZuwUuuf  
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    脚本代码 a]\l:r  
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    '#Language "WWB-COM" KDxqz$14 -  
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    Option Explicit n` M!K:Pq  
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    Sub Main x,L<{A`z  
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        'Cleanup 17la/7l<  
        ClearOutputWindow() jzvrJ14  
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        Print "Merging RPC Photonics BSDF Data Files" Ui|z#{8&  
        SetTextColor(255,0,0) QNWGUg4*&  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :<gC7UW  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ? `hA:X<  
        SetTextColor(0,0,0) Nux  
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        'Current directory of this script (should be the same as the text files being merged) 6pP:Q_U$  
        Dim cDir As String *{DpNV8"  
        cDir = MacroDir$ & "\" aGBUFCCa  
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        'Array which will be populated with the list of files to be merged nEHmiG  
        Dim fList() As String, curFile As String QlE]OAdB42  
        GetFileList( cDir, fList ) =aBc .PJ^  
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        Print "" 1Be/(pSc  
        Print "Files found for merging:" fb+_]{7g  
        For Each curFile In fList *(E]]8o  
            Print Chr(9) & curFile pF/s5z  
        Next iVT)V>Up  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 2Y>#FEW/  
        Dim nameArray() As String, sampName As String L;h|Sk]{  
        nameArray = Split(fList(0)," 0-0.txt") InA=ty]"_U  
        sampName  = nameArray(0) ^|%u%UR  
        Print "" *Za'^Z2  
        Print "Sample name: " & Chr(9) & sampName 7y4jk  
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        'Open an output file and write the FRED header data "O~7s}  
        Dim outFile As String nD.K*#u  
        outFile = cDir & sampName & "_FRED.txt" go9tvK  
        Open outFile For Output As #1 !mH !W5&  
        Print #1, "type bsdf_data" w"{mDL}c  
        Print #1, "format angles=deg bsdf=value scale=1" [nA1WFfM  
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        'Loop the file list, skip the two header lines and write the remaining data to file Pj8W]SA_  
        Dim lineArray() As String, curLine As Long }2h!  
        For Each curFile In fList 1z3>nou2{  
            Print "Merging data from file " & curFile Fe1XczB  
            ReadFile( cDir & curFile, lineArray ) ZiW&*nN?M  
            For curLine = 2 To UBound(lineArray) n|fKwWB\  
                Print #1, lineArray(curLine) `ztp u ~?  
            Next `{%ImXQF  
        Next {X 5G  
    } `Cc-X7  
        'Close the output file 5[LDG/{Tys  
        Close #1 '>cZ7:  
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        Print "Finished merging RPC data for sample " & sampName +,]_TxL|C  
        Print "FRED formatted data file: " & Chr(9) & outFile 8.HJoos  
    End Sub k%R(Qga  
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    'Utility function to read the contents of a file into an array of strings. _MW W  
    Function ReadFile(ByVal fileName As String, _ 3S .2  
                      ByRef lineArray() As String) As Long ''($E /  
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        ReadFile = -1 )# v}8aL  
        Dim oFSO As Object OP|X-  
        Set oFSO = CreateObject("Scripting.FileSystemObject") y[ZVi5) ,  
        Erase lineArray (y s<{Y-;  
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        Dim fid As Long JmC2buO  
        If oFSO.fileexists( fileName ) Then Rrrq>{D  
            fid = FreeFile() ;OC{B}.vH  
            Open fileName For Input As fid E~c>j<'-"<  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) [0D.+("EW  
            Close fid %?3$~d\n  
        End If Bk] `n'W  
        Set oFSO = Nothing 9* P-k.Bl  
        Return UBound( lineArray ) BCO (,k  
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    End Function BoXPX2:  
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    Sub GetFileList( ByVal in_dir As String, _ YZAQt* x  
                     ByRef in_flist() As String ) ydMhb367|  
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        'Redimension the file list array &oE'|^G  
        Erase in_flist \E6 0  
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        'Tracks how many files are found *x_e] /}  
        Dim fCount As Long xt6%[)  
        fCount = 0  PZY6 I  
    8_Z"@  
        'Recurse directory and search for text files MO? }$j  
        Dim f As String e~SRGyIww  
        f = Dir$(in_dir & "*.txt") j )wrF@W  
        While f <> "" Kpkpr`:)]  
            ReDim Preserve in_flist(fCount) 3lbGG42:  
            in_flist(fCount) = f ve\@u@K^  
            fCount += 1 ^9]g5.z:  
            f = Dir$() _$/Bt?h  
        Wend N;DE,[:<  
        ReDim Preserve in_flist(fCount-1)  c& $[a%s  
    Ce~Pms]  
    End Sub lk[u  
     
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