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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 O-N@HZC  
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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 uto E}U7]  
    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。 <y!(X"n`  
    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。 j,J/iJs  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 &x#3N=c#  
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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。 /hC'-6:]^  
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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) mR1|8H!f  
    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^>e| Eq|  
    例如下所示: C}D\^(nLu.  
    Sample name:  EDF-C1-56 AnD#k ]  
    Merging data from file EDF-C1-56 0-0.txt |{j\7G*5  
    Finished merging RPC data for sample EDF-C1-56 #$?!P1  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt dJf#j?\[  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 TEEt]R-y  
    a. 创建一个新的散射库 H2iC? cSR  
    b. 散射模型命名 so]p1@K  
    c. 改变散射模型为“Tabulated BSDF”. h)o5j-M>4  
    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 ) 9u^yEqG`  
    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:C\f]  
    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 6z3`*B  
    g. 点击OK !hc#il'g].  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 rJ^*8C!  
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    脚本代码 enB 2-)< K  
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    '#Language "WWB-COM" "NOll:5"(  
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    Option Explicit kWm[Lt  
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    Sub Main Y3M"a8e'  
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        'Cleanup ;]A:(HSZj  
        ClearOutputWindow() 7c>{og6  
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        Print "Merging RPC Photonics BSDF Data Files" %&\DCAFk  
        SetTextColor(255,0,0) L`@)*x)~R  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." dxk~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." i^_?C5  
        SetTextColor(0,0,0) dkI(&/  
    ^sb+|b  
        'Current directory of this script (should be the same as the text files being merged) -D^.I  
        Dim cDir As String U!D\Vd  
        cDir = MacroDir$ & "\" _2p D  
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        'Array which will be populated with the list of files to be merged =+>^:3cCQ  
        Dim fList() As String, curFile As String 1_RN*M +#  
        GetFileList( cDir, fList ) XMi)PXs$  
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        Print "" 5 cz6\A&  
        Print "Files found for merging:" s{@3G8  
        For Each curFile In fList bG&vCH;}%  
            Print Chr(9) & curFile T.B} k`$  
        Next n\'@]qG)Z4  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. EhK~S(r^  
        Dim nameArray() As String, sampName As String p5?8E$VHV  
        nameArray = Split(fList(0)," 0-0.txt") Hr/3nq}.  
        sampName  = nameArray(0) snti*e4"V  
        Print "" :j[a X7Sq2  
        Print "Sample name: " & Chr(9) & sampName r3mQoTvnv  
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        'Open an output file and write the FRED header data NoD\t(@h  
        Dim outFile As String qytH<UB  
        outFile = cDir & sampName & "_FRED.txt" S/H!a:_5r  
        Open outFile For Output As #1 ?CHFy2%Y  
        Print #1, "type bsdf_data" w W1>#F  
        Print #1, "format angles=deg bsdf=value scale=1" 6Cvg-X@  
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        'Loop the file list, skip the two header lines and write the remaining data to file 5l,Q=V^@l  
        Dim lineArray() As String, curLine As Long fNNik7  
        For Each curFile In fList q+)csgN  
            Print "Merging data from file " & curFile S1G=hgF_L  
            ReadFile( cDir & curFile, lineArray ) >7j(V`i"y  
            For curLine = 2 To UBound(lineArray) C$#X6Q!,  
                Print #1, lineArray(curLine) 8^)K|+_'m  
            Next ;&?l1Vu  
        Next a]nyZdt`  
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        'Close the output file $bo 5:c  
        Close #1 +t`QHvxv  
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        Print "Finished merging RPC data for sample " & sampName D`fi\A  
        Print "FRED formatted data file: " & Chr(9) & outFile ?KF.v1w7  
    End Sub v.pj PBU1  
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    'Utility function to read the contents of a file into an array of strings. 97~*Z|#<+  
    Function ReadFile(ByVal fileName As String, _ o:C],G_  
                      ByRef lineArray() As String) As Long E])X$:P?  
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        ReadFile = -1 \5=fC9*G  
        Dim oFSO As Object {nl4(2$  
        Set oFSO = CreateObject("Scripting.FileSystemObject") WeqQw?-  
        Erase lineArray y*fU_Il|!  
    Kl)PF),  
        Dim fid As Long {<}kqn83sT  
        If oFSO.fileexists( fileName ) Then r -SQk>Y}  
            fid = FreeFile() 2O~I.(9(  
            Open fileName For Input As fid }iF"&b0n"  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) xs ^$fn\  
            Close fid oN/T>&d  
        End If J;S@Q/s  
        Set oFSO = Nothing KXy|Si8w  
        Return UBound( lineArray ) Mk"V%)1k  
    //\UthOT  
    End Function K;}h u(*\]  
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    Sub GetFileList( ByVal in_dir As String, _ ;}=[( eqA  
                     ByRef in_flist() As String ) 8LouCv(>  
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        'Redimension the file list array ?[K \X  
        Erase in_flist sG~5O\,E  
    ]\Tcy[5  
        'Tracks how many files are found 1]l m0bfs  
        Dim fCount As Long Tfba3+V  
        fCount = 0 |Skxa\MI  
    &bO0Rn1F  
        'Recurse directory and search for text files (!0=~x|Z[  
        Dim f As String o]vU(j_Ju  
        f = Dir$(in_dir & "*.txt") MxXu&.| _  
        While f <> "" <Hq|<^_K  
            ReDim Preserve in_flist(fCount) k_c8\::p#  
            in_flist(fCount) = f i1#\S0jN  
            fCount += 1 ZxRD+`  
            f = Dir$() ZJxUv {J  
        Wend f9Hm2wV  
        ReDim Preserve in_flist(fCount-1) Jm+hDZrW  
    #sq$i  
    End Sub >/DyR+?>4  
     
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