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    [分享]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: 2020-12-15
    摘要 =}e{U&CX  
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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 fnFI w=d  
    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。 `{}DLaD9  
    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。 -9s&OKo`({  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 )Oj{x0{\Q  
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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。 #g1,U7vv8  
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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) S9qc34\^=  
    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 `2HNQiK'@  
    例如下所示: H1vToIP%  
    Sample name:  EDF-C1-56 >kDkvg1"  
    Merging data from file EDF-C1-56 0-0.txt .bRDz:?j  
    Finished merging RPC data for sample EDF-C1-56 I5rAL\y-G  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Cg^1(dBd[9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 5&134!hC  
    a. 创建一个新的散射库 88DMD"$B  
    b. 散射模型命名 QG XR<Y  
    c. 改变散射模型为“Tabulated BSDF”. V?jot<|$  
    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 ) #[~f 6s9D  
    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。 j[fY.>yt&  
    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 ]Lm?3$u$  
    g. 点击OK 3rx 8"  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 TF@k{_f  
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    脚本代码 ^'hh?mL  
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    '#Language "WWB-COM" j[:Iu#VR  
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    Option Explicit @$o^(my  
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    Sub Main |'Ksy{lA  
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        'Cleanup :b(Nrj&TQ[  
        ClearOutputWindow() xG,L*3c{o  
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        Print "Merging RPC Photonics BSDF Data Files" l}9E0^AS  
        SetTextColor(255,0,0) U#(#U0s*-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." " VSma  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ~J|B  
        SetTextColor(0,0,0) T<u QhPMw  
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        'Current directory of this script (should be the same as the text files being merged) 'o ZdMl&  
        Dim cDir As String p}yp!(l  
        cDir = MacroDir$ & "\" 1&utf0TX6q  
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        'Array which will be populated with the list of files to be merged Y:]m~-T  
        Dim fList() As String, curFile As String p4wx&VLi  
        GetFileList( cDir, fList ) rL6Y4u0e%  
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        Print "" _4X3g%nXl  
        Print "Files found for merging:" h@D!/PS  
        For Each curFile In fList zd {\XW  
            Print Chr(9) & curFile 4+B OS ~  
        Next 4cJka~  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Y86 mg7[U/  
        Dim nameArray() As String, sampName As String Rj])c^ZA'*  
        nameArray = Split(fList(0)," 0-0.txt") ^wb$wtL('  
        sampName  = nameArray(0) PsyXt5Dk  
        Print "" m4'x>Z  
        Print "Sample name: " & Chr(9) & sampName }x?2txuu  
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        'Open an output file and write the FRED header data Ab:+AC5{  
        Dim outFile As String [Qn$i/ ` J  
        outFile = cDir & sampName & "_FRED.txt" Ydh+iLjhx  
        Open outFile For Output As #1 h0zv @,u  
        Print #1, "type bsdf_data" ]Jx_bs~g  
        Print #1, "format angles=deg bsdf=value scale=1" yMKVF`D*  
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        'Loop the file list, skip the two header lines and write the remaining data to file ]E}eM@xdD  
        Dim lineArray() As String, curLine As Long l]Q<BV  
        For Each curFile In fList Kb*X2#;*  
            Print "Merging data from file " & curFile {4HcecT  
            ReadFile( cDir & curFile, lineArray ) {7LNQGiJ  
            For curLine = 2 To UBound(lineArray) XjU/7Q  
                Print #1, lineArray(curLine) K]C@seF`  
            Next "\l#q$1h  
        Next yFjjpEpnFt  
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        'Close the output file #;F*rJ[XY  
        Close #1 lD@`xq.M;  
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        Print "Finished merging RPC data for sample " & sampName uN9J?j*ir  
        Print "FRED formatted data file: " & Chr(9) & outFile C0 o  
    End Sub N:&EFfg3  
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    'Utility function to read the contents of a file into an array of strings. !9vq"J~hz"  
    Function ReadFile(ByVal fileName As String, _ "|<U`3y6  
                      ByRef lineArray() As String) As Long oS#PBql4  
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        ReadFile = -1 t-VU&.Y  
        Dim oFSO As Object GfL: 0  
        Set oFSO = CreateObject("Scripting.FileSystemObject") G)3Q|Vc  
        Erase lineArray + vO; J  
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        Dim fid As Long 4-JyK%m,0  
        If oFSO.fileexists( fileName ) Then @"O|[%7e  
            fid = FreeFile() K%WG[p\Eu  
            Open fileName For Input As fid VrnZrQj<  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9 y{R_  
            Close fid #(G"ya  
        End If "-:-!1;Ji  
        Set oFSO = Nothing JbLHW26pl  
        Return UBound( lineArray ) .r\|9 *j<  
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    End Function 9oTtH7%  
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    Sub GetFileList( ByVal in_dir As String, _ ,qT+Vqpr{  
                     ByRef in_flist() As String ) Vi'zSR28Z  
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        'Redimension the file list array 't3&,:Y  
        Erase in_flist BKk+<#Ti  
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        'Tracks how many files are found 1Ms_2  
        Dim fCount As Long r&ux|o+  
        fCount = 0 6 }>CPi#  
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        'Recurse directory and search for text files p&k%d, *  
        Dim f As String uo-1.[9ds  
        f = Dir$(in_dir & "*.txt") C zb: nyRj  
        While f <> "" sny$[!)  
            ReDim Preserve in_flist(fCount) e&-MP;kgW9  
            in_flist(fCount) = f ky@ZEp=  
            fCount += 1 JiFB<Q\  
            f = Dir$() P`AW8Y6o  
        Wend mKuY=#RP  
        ReDim Preserve in_flist(fCount-1) 7[ZoUWx  
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    End Sub -1}&\=8M  
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