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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 O%>FKU>(?  
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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 5S;|U&f|  
    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。 b8>2Y'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。 l'K3)yQEJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 M)<4|x  
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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。 A#WvN>  
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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) gvoo1 Sa  
    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 NIzxSGk|  
    例如下所示: N9[2k.oBH  
    Sample name:  EDF-C1-56 tW=,o&C=  
    Merging data from file EDF-C1-56 0-0.txt @S-p[u  
    Finished merging RPC data for sample EDF-C1-56 09r0Rb  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt SviGLv;oR  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 hPM:=@ N$  
    a. 创建一个新的散射库 bR0z$~  
    b. 散射模型命名 /.Fvl;!J;  
    c. 改变散射模型为“Tabulated BSDF”. }gfs  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) B <CK~ybY  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 d{gj8  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 nVK`H@5fw  
    g. 点击OK z.xOT;t  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =VctG>ct|  
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    脚本代码 <21@jdu3n,  
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    '#Language "WWB-COM" ~I_v {  
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    Option Explicit 60A E~  
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    Sub Main e@GR[0~  
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        'Cleanup W8/8V,  
        ClearOutputWindow() +( *;F4>  
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        Print "Merging RPC Photonics BSDF Data Files" 2u> [[U1:  
        SetTextColor(255,0,0) tSZd0G<A<o  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." fuwv,[m  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "(U%Vg|)  
        SetTextColor(0,0,0) x D(RjL+  
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        'Current directory of this script (should be the same as the text files being merged) Yy_o*Ozq  
        Dim cDir As String Vd'KN2Jm  
        cDir = MacroDir$ & "\" UT^-!L LB]  
    |.s#m^"  
        'Array which will be populated with the list of files to be merged K?4/x4p@  
        Dim fList() As String, curFile As String Dn}Wsd=  
        GetFileList( cDir, fList ) e2onR~Cf  
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        Print "" /!u#S9_B  
        Print "Files found for merging:" d+6 by,'  
        For Each curFile In fList oQkY@)3.w  
            Print Chr(9) & curFile F$;vPAxbK"  
        Next 1o;*`  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ]{[8$|Mg  
        Dim nameArray() As String, sampName As String 6]#\|lds1  
        nameArray = Split(fList(0)," 0-0.txt") iTt#%Fs)4M  
        sampName  = nameArray(0) nt"8kv  
        Print "" jv"^_1  
        Print "Sample name: " & Chr(9) & sampName xyoh B#'W  
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        'Open an output file and write the FRED header data Fe4QWB6\U  
        Dim outFile As String T}?vp~./   
        outFile = cDir & sampName & "_FRED.txt" 2WA =U]  
        Open outFile For Output As #1 &|:T+LVv$+  
        Print #1, "type bsdf_data" s 4Mi9h_  
        Print #1, "format angles=deg bsdf=value scale=1" ""dX4^gtU  
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        'Loop the file list, skip the two header lines and write the remaining data to file 6iozb~!Rr  
        Dim lineArray() As String, curLine As Long UacGq,  
        For Each curFile In fList Tz=YSQy$9  
            Print "Merging data from file " & curFile /R_*u4}iD  
            ReadFile( cDir & curFile, lineArray ) $rZ:$d.C  
            For curLine = 2 To UBound(lineArray) `f@VX :aL}  
                Print #1, lineArray(curLine) )A`Zgg'L7D  
            Next :\0q\2e[<  
        Next rQncW~  
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        'Close the output file NMSpi[dr  
        Close #1 ZU vA`   
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        Print "Finished merging RPC data for sample " & sampName n&. bs7N2  
        Print "FRED formatted data file: " & Chr(9) & outFile =,aWO7Pz  
    End Sub j15TavjGh  
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    'Utility function to read the contents of a file into an array of strings. h=q%h8  
    Function ReadFile(ByVal fileName As String, _ U`j[Ni}"  
                      ByRef lineArray() As String) As Long IH$R X GL  
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        ReadFile = -1 !lSxBr[dQ  
        Dim oFSO As Object x04JU$@  
        Set oFSO = CreateObject("Scripting.FileSystemObject") a<.7q1F  
        Erase lineArray ^6?NYHMr=  
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        Dim fid As Long dYg}qad5:  
        If oFSO.fileexists( fileName ) Then a0"gt"q A  
            fid = FreeFile() 2p(M`@  
            Open fileName For Input As fid (8!#<$  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) -%XvWZvZ  
            Close fid lR!Sdd} -  
        End If zS Yh ?NB5  
        Set oFSO = Nothing ZCQ7xQD  
        Return UBound( lineArray ) 7'[C+/:  
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    End Function v-85` h  
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    Sub GetFileList( ByVal in_dir As String, _ L3Leb%,!  
                     ByRef in_flist() As String ) n6gYZd  
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        'Redimension the file list array k'N `5M)  
        Erase in_flist ?VMj;+'tr  
    p}KZ#"Q  
        'Tracks how many files are found _tR%7%3*  
        Dim fCount As Long &jgpeFiiC  
        fCount = 0 @:@0}]%z9  
    *G^n<p$"  
        'Recurse directory and search for text files l`2X'sw[/  
        Dim f As String eNlE]W,=  
        f = Dir$(in_dir & "*.txt") 6 ^X$;  
        While f <> "" 5/Ng!bW  
            ReDim Preserve in_flist(fCount) {xw*H<"f<  
            in_flist(fCount) = f D[)")xiG  
            fCount += 1 gmfux b/  
            f = Dir$() j.$#10*:  
        Wend pti`q )  
        ReDim Preserve in_flist(fCount-1) }DTpl?l  
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    End Sub  M/5e4b  
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