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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
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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 y/Fv4<X  
    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。 Wf^6:  
    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。 FX`SaY>D  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 9XImgeAs  
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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。 l`G .lM(  
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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) :@a8>i1&  
    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 6}ct{Q  
    例如下所示: sPuNwVX>}I  
    Sample name:  EDF-C1-56 yANk(  
    Merging data from file EDF-C1-56 0-0.txt x9)^0Hbo  
    Finished merging RPC data for sample EDF-C1-56 Tp2`eY5  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'te4mY}  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 FO#`}? R`  
    a. 创建一个新的散射库 JE9SPFQx9M  
    b. 散射模型命名 }ac0}  
    c. 改变散射模型为“Tabulated BSDF”. X-%XZD B6  
    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 ) RoCX*3d  
    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>]FO  
    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 FJDx80J  
    g. 点击OK &i179Qg!  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 MA0 }BJoW  
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    脚本代码 M}2a/}4   
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    '#Language "WWB-COM" :Lu=t3#  
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    Option Explicit [+<lm 5t  
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    Sub Main ^EY^.?Mg  
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        'Cleanup ~ HFDX@m*  
        ClearOutputWindow() ;K]6/Wt  
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        Print "Merging RPC Photonics BSDF Data Files" Gxx:<`[ON  
        SetTextColor(255,0,0) YTP6m9hA+  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." s|L}wtc  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." !cS A|C  
        SetTextColor(0,0,0) Nr 5h%<` I  
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        'Current directory of this script (should be the same as the text files being merged) 7~(|q2ib  
        Dim cDir As String Al&)8x{p  
        cDir = MacroDir$ & "\" `(NMHXgG+  
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        'Array which will be populated with the list of files to be merged F} d>pK9fn  
        Dim fList() As String, curFile As String aF2vw{wT}  
        GetFileList( cDir, fList ) 7`AQn],  
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        Print "" O%feBe  
        Print "Files found for merging:" sswYwU  
        For Each curFile In fList X;`XkOjk  
            Print Chr(9) & curFile $]O;D~  
        Next 0G@sj7)]  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -:Up$6PR  
        Dim nameArray() As String, sampName As String Ps=OL\i  
        nameArray = Split(fList(0)," 0-0.txt") t0t" =(d  
        sampName  = nameArray(0) a?&{eMEe}  
        Print "" .[YM0dt  
        Print "Sample name: " & Chr(9) & sampName  5`];[M9  
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        'Open an output file and write the FRED header data rfj>/?8!@  
        Dim outFile As String T#&tf^;  
        outFile = cDir & sampName & "_FRED.txt" aLzRbRv  
        Open outFile For Output As #1 OX|nYTp  
        Print #1, "type bsdf_data" aN n\URR  
        Print #1, "format angles=deg bsdf=value scale=1" N pu#.)G  
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        'Loop the file list, skip the two header lines and write the remaining data to file s'/b&Idf8  
        Dim lineArray() As String, curLine As Long 6R_G{AWLL  
        For Each curFile In fList H#yBWvj*H  
            Print "Merging data from file " & curFile rO#WG}E<"  
            ReadFile( cDir & curFile, lineArray ) `rt?n|*QF  
            For curLine = 2 To UBound(lineArray) #Fp5>%*  
                Print #1, lineArray(curLine) ;Ohabbj*  
            Next c*iZ6j"iI  
        Next eAvOT$  
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        'Close the output file )<Cf,R  
        Close #1 eRV4XB:  
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        Print "Finished merging RPC data for sample " & sampName Ih_2")d  
        Print "FRED formatted data file: " & Chr(9) & outFile ZV:cg v  
    End Sub 1$1s 0yg  
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    'Utility function to read the contents of a file into an array of strings. Ns3k(j16  
    Function ReadFile(ByVal fileName As String, _ E RnuM  
                      ByRef lineArray() As String) As Long (- ]A1WQ?  
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        ReadFile = -1 HP`dfo~j  
        Dim oFSO As Object o{C7V *  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Rn] `_[)*~  
        Erase lineArray ^P)W/2  
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        Dim fid As Long TV^m1uC  
        If oFSO.fileexists( fileName ) Then 0[ (Z48  
            fid = FreeFile() kH&KE5  
            Open fileName For Input As fid  ]I pLF#  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) }ZPO^4H;-  
            Close fid '!$g<= @  
        End If @(k}q3b<  
        Set oFSO = Nothing ?_hKhn%K9  
        Return UBound( lineArray ) Q7<_> )e^  
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    End Function J`uO~W"  
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    Sub GetFileList( ByVal in_dir As String, _ ;;A8*\*$  
                     ByRef in_flist() As String ) *OoM[wEY  
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        'Redimension the file list array iR_j h=2{  
        Erase in_flist nu'r `  
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        'Tracks how many files are found pb>TUKvT&  
        Dim fCount As Long *<.{sx^Gk  
        fCount = 0 +>v3&[lGv  
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        'Recurse directory and search for text files ]VuB2L[D  
        Dim f As String Nn`l+WA3  
        f = Dir$(in_dir & "*.txt") YU*u!  
        While f <> "" QJeL&mf  
            ReDim Preserve in_flist(fCount) olHT* mr  
            in_flist(fCount) = f C2l=7+X#W  
            fCount += 1 HUP~  
            f = Dir$() yJyovfJz.  
        Wend [ ;/4'  
        ReDim Preserve in_flist(fCount-1) !c 3c%=W  
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    End Sub T/m4jf2  
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