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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 lO=~&_  
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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 -$o4WSd~  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 #_'| TT>p#  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 MXrh[QCU)  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 DgKe!w$  
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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。 >tTu1#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) Itv}TK eF  
    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 ok(dCAKP  
    例如下所示: p>= b|Qy|  
    Sample name:  EDF-C1-56 xMHu:,ND  
    Merging data from file EDF-C1-56 0-0.txt A3Oe=rB  
    Finished merging RPC data for sample EDF-C1-56 dr]Pns9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @Q%<~b[y  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ?+?`Js o(  
    a. 创建一个新的散射库 1hW"#>f7  
    b. 散射模型命名 #pr{tL  
    c. 改变散射模型为“Tabulated BSDF”. l@`Do[  
    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 ) #SqU>R  
    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。 B-W8Zq#4>  
    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 um*!+Q  
    g. 点击OK ' ;3#t(J;  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 o>Q=V 0?  
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    脚本代码 % jSB9  
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    '#Language "WWB-COM" mH /9J  
    < m/@_"  
    Option Explicit 3h`_Qv%g  
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    Sub Main `w EAU7m:  
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        'Cleanup BTDUT%Yfg  
        ClearOutputWindow() V~fPp"F  
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        Print "Merging RPC Photonics BSDF Data Files" T[ltOQw?Y  
        SetTextColor(255,0,0) uc]`^,`2/  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." f8S!FGiNc  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." [(m+Ejzi%  
        SetTextColor(0,0,0) ?XB[awTD~  
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        'Current directory of this script (should be the same as the text files being merged) JXq l=/%  
        Dim cDir As String  giORc  
        cDir = MacroDir$ & "\" 9qI#vHA  
    PdSYFJM  
        'Array which will be populated with the list of files to be merged ]?lUe5F  
        Dim fList() As String, curFile As String ^!rAT1(/_  
        GetFileList( cDir, fList ) 3NSX(gC%  
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        Print "" {8T/;K@  
        Print "Files found for merging:" "-R19SpJKh  
        For Each curFile In fList [^0 S#,L  
            Print Chr(9) & curFile K(}g!iT)~  
        Next W[t0hbV w  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. $d5}OI"g  
        Dim nameArray() As String, sampName As String v/x~L$[  
        nameArray = Split(fList(0)," 0-0.txt") HUalD3 \  
        sampName  = nameArray(0) Dy|)u1?  
        Print "" DdCNCXU  
        Print "Sample name: " & Chr(9) & sampName GS+Z(,J>=  
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        'Open an output file and write the FRED header data Y(B3M=j  
        Dim outFile As String Wgb L9'}B  
        outFile = cDir & sampName & "_FRED.txt" `l0"4 [?  
        Open outFile For Output As #1 |vtj0 ,[  
        Print #1, "type bsdf_data" p mUG`8SY  
        Print #1, "format angles=deg bsdf=value scale=1" 3GPGwzX |  
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        'Loop the file list, skip the two header lines and write the remaining data to file w@x||K=Z  
        Dim lineArray() As String, curLine As Long cf,^7,-`"  
        For Each curFile In fList  6h?)x  
            Print "Merging data from file " & curFile <lTLz$QE  
            ReadFile( cDir & curFile, lineArray ) 7x#."6>Dy  
            For curLine = 2 To UBound(lineArray) ).IK[5Q`  
                Print #1, lineArray(curLine) zI"1.^Trn  
            Next T\w{&3ONm  
        Next c\OLf_Uf  
    B{!*OC{l  
        'Close the output file pvhN.z  
        Close #1 `J %35  
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        Print "Finished merging RPC data for sample " & sampName 9QHV%%  
        Print "FRED formatted data file: " & Chr(9) & outFile DLPg0>;jl  
    End Sub zg$NrI&  
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    'Utility function to read the contents of a file into an array of strings. H1r8n$h  
    Function ReadFile(ByVal fileName As String, _ J+m1d\lBu  
                      ByRef lineArray() As String) As Long &]O^d4/  
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        ReadFile = -1 "'~&D/7  
        Dim oFSO As Object 7)*q@  
        Set oFSO = CreateObject("Scripting.FileSystemObject") )yUSuK(Vu  
        Erase lineArray v9"03 =h  
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        Dim fid As Long 6 -BC/  
        If oFSO.fileexists( fileName ) Then 3;F up4!4}  
            fid = FreeFile() Rw^X5ByJE  
            Open fileName For Input As fid v.F|8 cG  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) %R  P\,|  
            Close fid lBLL45%BIN  
        End If up2wkc8  
        Set oFSO = Nothing !+ (H(,gI  
        Return UBound( lineArray ) g\pLQH  
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    End Function dg#w!etB  
    ]v#T9QQN  
    Sub GetFileList( ByVal in_dir As String, _ k,61Va  
                     ByRef in_flist() As String ) 465?,EpS  
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        'Redimension the file list array .V@3zzv\  
        Erase in_flist P52qtN<  
    "EnxVV  
        'Tracks how many files are found 7`tJ/xtMy;  
        Dim fCount As Long ?u>A2Vc!  
        fCount = 0 {bNVNG^  
    @s0mX3P  
        'Recurse directory and search for text files ]v l?J  
        Dim f As String \lF-]vz*  
        f = Dir$(in_dir & "*.txt") _Uhl4Mh  
        While f <> "" yT[)V[}  
            ReDim Preserve in_flist(fCount) @b{$s  
            in_flist(fCount) = f o @nsv&i  
            fCount += 1  CP Ju=  
            f = Dir$() {T3~js   
        Wend {dwlW`{  
        ReDim Preserve in_flist(fCount-1) zT")!Df>'  
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    End Sub W4=A.2[q  
     
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