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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 '?$R YU,  
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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 >uxAti\  
    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。 WFTwFm6  
    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。 tC5>K9Ed  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 hOYP~OR  
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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。 D,()e^o  
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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) K,,'{j2#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 ,Fn-SrB:  
    例如下所示: 7M~/[f7Z{  
    Sample name:  EDF-C1-56 `i!fg\qnK  
    Merging data from file EDF-C1-56 0-0.txt T_d)1m fl  
    Finished merging RPC data for sample EDF-C1-56 J(SGaHm@  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >[ g=G  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >2ha6A[  
    a. 创建一个新的散射库 f VJWW):  
    b. 散射模型命名 rl x6a@MiD  
    c. 改变散射模型为“Tabulated BSDF”. Fd<eh(g9P  
    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 ) <`u_O!h  
    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。 ByacSN  
    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 kJ?AAPC  
    g. 点击OK RIDl4c [  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1--Ka& H  
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    脚本代码 %LuA:{EVD  
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    '#Language "WWB-COM" MpTOC&NG%s  
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    Option Explicit f@k.4aS  
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    Sub Main Tv9\` F[  
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        'Cleanup {w@9\LsU  
        ClearOutputWindow() !3{;oU%*  
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        Print "Merging RPC Photonics BSDF Data Files" d5`D[,]d  
        SetTextColor(255,0,0) ay#f\P!1  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." VB`% u=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." csA-<}S5]b  
        SetTextColor(0,0,0) /&9R*xNST#  
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        'Current directory of this script (should be the same as the text files being merged) /.~zk(-&h  
        Dim cDir As String nb ?(zDJ8  
        cDir = MacroDir$ & "\" v57<b&p26  
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        'Array which will be populated with the list of files to be merged IZGRQmi"  
        Dim fList() As String, curFile As String 'dqecmB  
        GetFileList( cDir, fList ) 8A}<-?>  
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        Print "" yF1p^>*ak&  
        Print "Files found for merging:" qj4jM7  
        For Each curFile In fList j6j4M,UI43  
            Print Chr(9) & curFile %m|1LI(  
        Next Hv2[=elc  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6Kw?  
        Dim nameArray() As String, sampName As String o' v!83$L  
        nameArray = Split(fList(0)," 0-0.txt") ]u:_r)T  
        sampName  = nameArray(0) `xZ,*G7(*  
        Print "" IfT: 9 &  
        Print "Sample name: " & Chr(9) & sampName %xKZ" #Z#K  
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        'Open an output file and write the FRED header data *aq"c9  
        Dim outFile As String 0g~Cdp  
        outFile = cDir & sampName & "_FRED.txt" 9m\Yi  
        Open outFile For Output As #1 p=^6V"'  
        Print #1, "type bsdf_data" p/G9P +?  
        Print #1, "format angles=deg bsdf=value scale=1" #N%j9  
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        'Loop the file list, skip the two header lines and write the remaining data to file L$rr:^J  
        Dim lineArray() As String, curLine As Long .&`apQD}  
        For Each curFile In fList "{trK?-8%  
            Print "Merging data from file " & curFile YQWq*o^:  
            ReadFile( cDir & curFile, lineArray ) dpX Fx"4A  
            For curLine = 2 To UBound(lineArray) i g .  
                Print #1, lineArray(curLine) +1@'2w{  
            Next oX'@,(6)  
        Next +zXcTT[V  
    -f1lu*3\  
        'Close the output file ~)zxIO!  
        Close #1 <_]W1V:0  
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        Print "Finished merging RPC data for sample " & sampName t*dq*(3"c  
        Print "FRED formatted data file: " & Chr(9) & outFile zbGZ\pz  
    End Sub o wI:Qs_/4  
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    'Utility function to read the contents of a file into an array of strings. -F 9 xPw  
    Function ReadFile(ByVal fileName As String, _ E25w^x2  
                      ByRef lineArray() As String) As Long 'Sesh'2 /  
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        ReadFile = -1 Pjxj$>&;*j  
        Dim oFSO As Object 9XhH*tBn7(  
        Set oFSO = CreateObject("Scripting.FileSystemObject") TB=_r(:l+  
        Erase lineArray IYHNN  
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        Dim fid As Long E|jU8qz>P  
        If oFSO.fileexists( fileName ) Then /0$405  
            fid = FreeFile() u:6R|%1fNn  
            Open fileName For Input As fid |.$7.8g  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) nLC5FA7<  
            Close fid JIHIKH-#  
        End If jw 5 U-zi  
        Set oFSO = Nothing P,xJVo\  
        Return UBound( lineArray ) B6KG\,'|  
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    End Function <M}O&?N 8x  
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    Sub GetFileList( ByVal in_dir As String, _ 6eA)d#  
                     ByRef in_flist() As String ) uu"hu||0_  
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        'Redimension the file list array UX<)hvKj  
        Erase in_flist mdo$d-d&  
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        'Tracks how many files are found -t>"s'kv  
        Dim fCount As Long v(=0hY9 O  
        fCount = 0 @K}h4Yok  
    Azp!;+  
        'Recurse directory and search for text files n3qRt  
        Dim f As String wZW\r!Us  
        f = Dir$(in_dir & "*.txt") "dE[X` }=  
        While f <> "" DsD? &:  
            ReDim Preserve in_flist(fCount) }T AG7U*  
            in_flist(fCount) = f tmM; Z(9t  
            fCount += 1 Li$2 Gpc/  
            f = Dir$() td23Z1Elk#  
        Wend DL,]iJm  
        ReDim Preserve in_flist(fCount-1) #6l(2d  
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    End Sub q)KOI` A  
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