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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 b,xZY1a  
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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 :viW  
    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。 [9; @1I<x  
    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&xZN8jW   
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 %* "+kw Z  
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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。 Vj*-E  
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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) #D`@G8~(  
    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 d][ Wm  
    例如下所示: }p)K6!J0  
    Sample name:  EDF-C1-56 :{7+[LcH7  
    Merging data from file EDF-C1-56 0-0.txt s0SzO,Vi  
    Finished merging RPC data for sample EDF-C1-56 DR#" 3  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <Ky-3:pxeM  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 zggnDkC5  
    a. 创建一个新的散射库 9zp!lw~;+  
    b. 散射模型命名 4E$MhP  
    c. 改变散射模型为“Tabulated BSDF”. wI.aV>  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /5@YZ?|#2  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 fUT[tkb/!  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 VBhUh~:Om  
    g. 点击OK 9[0iIT$q$  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 -&Rv=q>  
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    脚本代码 .t8)`MU6.  
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    '#Language "WWB-COM" vm [lMx  
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    Option Explicit =?i?-6M  
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    Sub Main gQnr.  
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        'Cleanup KOcB#UHJ  
        ClearOutputWindow() `ecseBn3d  
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        Print "Merging RPC Photonics BSDF Data Files" 8g#$Y2P  
        SetTextColor(255,0,0) PgBEe @.  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." .;? Bni  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." O. * 0;5  
        SetTextColor(0,0,0) i)i>Ulj*i  
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        'Current directory of this script (should be the same as the text files being merged) R"nB4R0Uh  
        Dim cDir As String h]4xS?6O  
        cDir = MacroDir$ & "\" 1T^WMn:U  
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        'Array which will be populated with the list of files to be merged 74%vNKzc~  
        Dim fList() As String, curFile As String 0z8(9DlTc  
        GetFileList( cDir, fList ) Eb3ZM#  
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        Print "" 5y#,z`S  
        Print "Files found for merging:" (.J/Ql0Y  
        For Each curFile In fList 'E| %l!xO  
            Print Chr(9) & curFile r%,?uim#  
        Next qGinlE&\  
    #:)'D?,  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 5KC Qvv\  
        Dim nameArray() As String, sampName As String b?~p/[  
        nameArray = Split(fList(0)," 0-0.txt") [|nK5(e9  
        sampName  = nameArray(0) 3",gjXmBu  
        Print "" so-5%S  
        Print "Sample name: " & Chr(9) & sampName +=tdgw/  
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        'Open an output file and write the FRED header data ?t/qaUXN  
        Dim outFile As String oo'9ZE/%  
        outFile = cDir & sampName & "_FRED.txt" 66=[6U9 *  
        Open outFile For Output As #1 x9lA';})  
        Print #1, "type bsdf_data" 1/dL-"*0  
        Print #1, "format angles=deg bsdf=value scale=1" o}N@Q-i gq  
    *D]:{#C*  
        'Loop the file list, skip the two header lines and write the remaining data to file w2LnY1A  
        Dim lineArray() As String, curLine As Long y_X6{}Ke  
        For Each curFile In fList 7[ ovEE54  
            Print "Merging data from file " & curFile n Kkpp-  
            ReadFile( cDir & curFile, lineArray ) =s\$i0A2  
            For curLine = 2 To UBound(lineArray) ZFZ'&"+  
                Print #1, lineArray(curLine) O&Y;/$w  
            Next [4Q;(67  
        Next % km <+F=~  
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        'Close the output file 8JLf @C:  
        Close #1 m6Dm1'+  
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        Print "Finished merging RPC data for sample " & sampName Fa("Gok[  
        Print "FRED formatted data file: " & Chr(9) & outFile 2Kxb(q"  
    End Sub G(E1c"?  
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    'Utility function to read the contents of a file into an array of strings. fUw:jE xz  
    Function ReadFile(ByVal fileName As String, _ gM96RY  
                      ByRef lineArray() As String) As Long t=%zY~P  
    d) -(C1f  
        ReadFile = -1 HUKrp*Hv  
        Dim oFSO As Object =!TUf/O-  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Y9.3`VX  
        Erase lineArray geQ!}zXWi  
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        Dim fid As Long *@rA7zPFf  
        If oFSO.fileexists( fileName ) Then %" iX3  
            fid = FreeFile() P(T-2Ux6  
            Open fileName For Input As fid 5/.W-Q\pl}  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) &h:4TaD  
            Close fid KhjC'CU,  
        End If Dk  `&tr  
        Set oFSO = Nothing ^".OMS"!  
        Return UBound( lineArray ) Du_5iuMh  
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    End Function XYU5.  
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    Sub GetFileList( ByVal in_dir As String, _ jKUEs75]  
                     ByRef in_flist() As String ) poz_=,c  
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        'Redimension the file list array fU6YJs.H^8  
        Erase in_flist Ts!'>_<Je  
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        'Tracks how many files are found w:\} B'u  
        Dim fCount As Long +\=g&G,  
        fCount = 0 o2fih%p?1  
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        'Recurse directory and search for text files :9&c%~7B9  
        Dim f As String _H$Lu4b)N  
        f = Dir$(in_dir & "*.txt") x%dny]O1;  
        While f <> "" p%I)&- 8  
            ReDim Preserve in_flist(fCount) ).KA0-  
            in_flist(fCount) = f J;& y?%{@5  
            fCount += 1 f-~Y  
            f = Dir$() ` o)KG,  
        Wend ztVTXI%Kz  
        ReDim Preserve in_flist(fCount-1) P@N+jS`Vf  
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    End Sub M+ [ho]  
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