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    [技术]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: 2023-05-11
    摘要 Enn7p9&  
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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 $^?"/;8P5  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 E&P'@'Yk  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 bB@1tp0+  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :@{(^}N8u  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 DZ -5A  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) yEyx.Mh.Af  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ;rYL\`6L  
    例如下所示: /"?yB$s  
    Sample name:  EDF-C1-56 }.ZX.qYX  
    Merging data from file EDF-C1-56 0-0.txt #qY`xH'>  
    Finished merging RPC data for sample EDF-C1-56 ?U.+SQ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt hAtf)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 9HrT>{@  
    a. 创建一个新的散射库 G vMhgG=D  
    b. 散射模型命名 r18eu B%  
    c. 改变散射模型为“Tabulated BSDF”. V/"UDof  
    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 ) 68JYA?  
    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。 ste0:.*qb  
    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 /MYl:>e>  
    g. 点击OK [E<NEl *  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 UIgs/  
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    脚本代码 F \6-s`(  
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    '#Language "WWB-COM" o0nd]"q?  
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    Option Explicit `~0)}K.F  
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    Sub Main N\{Xhr7d  
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        'Cleanup x9Um4!/t  
        ClearOutputWindow() zLEl/yPE  
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        Print "Merging RPC Photonics BSDF Data Files" E{x<P0 ;  
        SetTextColor(255,0,0) hB/4.K]8  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Z$ q{!aY  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." h=h4`uA9  
        SetTextColor(0,0,0) 2GeJ\1k  
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        'Current directory of this script (should be the same as the text files being merged) _wMxKM  
        Dim cDir As String U4;r.#qw,  
        cDir = MacroDir$ & "\" :"QR;O@  
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        'Array which will be populated with the list of files to be merged -Uj)6PzGu  
        Dim fList() As String, curFile As String c"HB7  
        GetFileList( cDir, fList ) 8Ld{Xg  
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        Print "" fNR2(8;}  
        Print "Files found for merging:" Wk<heF  
        For Each curFile In fList C:z+8wt  
            Print Chr(9) & curFile wJc~AP)I%z  
        Next Y$JGpeq8w  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. N8*6sK.  
        Dim nameArray() As String, sampName As String 9~3;upWu!  
        nameArray = Split(fList(0)," 0-0.txt") s4V-brCM$|  
        sampName  = nameArray(0) 6!F@?3qCyg  
        Print "" T($d3Nn1  
        Print "Sample name: " & Chr(9) & sampName 0F48T<i  
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        'Open an output file and write the FRED header data 0 PdeK'7  
        Dim outFile As String fv@mA--  
        outFile = cDir & sampName & "_FRED.txt" zD}@QoB  
        Open outFile For Output As #1 rgq~lZ.U4K  
        Print #1, "type bsdf_data" arVu`pD*n  
        Print #1, "format angles=deg bsdf=value scale=1" b$@vJ7V!  
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        'Loop the file list, skip the two header lines and write the remaining data to file *LuR <V  
        Dim lineArray() As String, curLine As Long *Wbs{>&No  
        For Each curFile In fList 2fqg,_  
            Print "Merging data from file " & curFile #BPJRNXd  
            ReadFile( cDir & curFile, lineArray ) T'i^yd }*v  
            For curLine = 2 To UBound(lineArray) 1`6kc9f.  
                Print #1, lineArray(curLine) tL#~U2K  
            Next -d-vzri  
        Next h2S!<  
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        'Close the output file WZ@hP'Zc  
        Close #1 ;*{"|l qe  
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        Print "Finished merging RPC data for sample " & sampName /$[9-G?  
        Print "FRED formatted data file: " & Chr(9) & outFile 6DkFIkS  
    End Sub 8Cx6Me>,=  
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    'Utility function to read the contents of a file into an array of strings. ZYS`M?Au  
    Function ReadFile(ByVal fileName As String, _ 7Gh+EJJ3I  
                      ByRef lineArray() As String) As Long }H5~@c$  
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        ReadFile = -1 +DsdzR`Gx,  
        Dim oFSO As Object pH9xyN[:a  
        Set oFSO = CreateObject("Scripting.FileSystemObject") %3%bRP  
        Erase lineArray 8(3n v[  
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        Dim fid As Long N4HIQ\p  
        If oFSO.fileexists( fileName ) Then Wg5<@=x!G  
            fid = FreeFile() NZb}n`:  
            Open fileName For Input As fid 0#G@F5; <  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ayGcc`  
            Close fid A4~- {.w=  
        End If ?<;9=l\Q  
        Set oFSO = Nothing &xWej2a!  
        Return UBound( lineArray ) }AW"2<@  
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    End Function $./&GOus  
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    Sub GetFileList( ByVal in_dir As String, _ 1fH2obI~X  
                     ByRef in_flist() As String ) 4j1$1C{  
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        'Redimension the file list array 79*f <Gr  
        Erase in_flist JW},7Ox  
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        'Tracks how many files are found A.9ZFFz  
        Dim fCount As Long 56?RFnZ&j  
        fCount = 0 +$YH dgZ.  
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        'Recurse directory and search for text files ~tc,p  
        Dim f As String un F=";9H  
        f = Dir$(in_dir & "*.txt") C+L_f_6]  
        While f <> "" '" 4;;(  
            ReDim Preserve in_flist(fCount) O#@G .~n?  
            in_flist(fCount) = f <dGph  
            fCount += 1 OZR{+YrB^  
            f = Dir$() ,W|cyQ  
        Wend uXouN$&  
        ReDim Preserve in_flist(fCount-1) |}o6N5)  
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    End Sub ^)E# c  
     
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