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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 I8%'Z>E(  
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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 Gc!{%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。 wG[l9)lz  
    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。 |Gs-9+'y  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :3*oAh8|  
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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。 R]s jG <  
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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) vHe.+XY  
    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 B;7s]R  
    例如下所示: 43Uy<%yb>}  
    Sample name:  EDF-C1-56 z}N^`_ *  
    Merging data from file EDF-C1-56 0-0.txt %t|2GIu  
    Finished merging RPC data for sample EDF-C1-56 ;S27m]Q?  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt "lzg@=$|)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0 S8{VZpy  
    a. 创建一个新的散射库 ZS>/ 5  
    b. 散射模型命名 "m)O13x  
    c. 改变散射模型为“Tabulated BSDF”. l+X^x%EA  
    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 ) um;U;%?Q  
    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。 P3FpU<OBwp  
    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 "MP{z~M mj  
    g. 点击OK Yy~Dg  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2-2LmxLG  
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    脚本代码 XxQ2g&USk  
    'N/%SRk  
    '#Language "WWB-COM" U]&%EqLS  
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    Option Explicit $4) g uG)  
    [/^g) ^s:  
    Sub Main 2YEn)A@8  
    l{ { #tW  
        'Cleanup *hgsS~  
        ClearOutputWindow() j*\MUR=  
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        Print "Merging RPC Photonics BSDF Data Files" k)_#u;qmG  
        SetTextColor(255,0,0) Y{{,62D  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." &G,v*5N8$K  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." t?&ajh  
        SetTextColor(0,0,0) L7="!I  
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        'Current directory of this script (should be the same as the text files being merged) \05C'z3]  
        Dim cDir As String aa3YtNpP  
        cDir = MacroDir$ & "\" 3p#^#1/_  
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        'Array which will be populated with the list of files to be merged z$,hdZ]  
        Dim fList() As String, curFile As String SK2pOZN  
        GetFileList( cDir, fList ) "K]4j]yU  
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        Print "" #jR?C9&!(  
        Print "Files found for merging:" ld0WZj  
        For Each curFile In fList /;[')RO`  
            Print Chr(9) & curFile 0(.C f.B~  
        Next I!%@|[ Ow  
    8;bOw  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. hD=D5LYAZ  
        Dim nameArray() As String, sampName As String |LhuZ_;1xo  
        nameArray = Split(fList(0)," 0-0.txt") g-`NsqzD  
        sampName  = nameArray(0) '/@VG_9L]  
        Print "" -#hl& ^u$  
        Print "Sample name: " & Chr(9) & sampName 'c]&{-w<i  
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        'Open an output file and write the FRED header data EkPSG&6RZ  
        Dim outFile As String iWsIc\!+,  
        outFile = cDir & sampName & "_FRED.txt" IEj`:]d  
        Open outFile For Output As #1 ={d\zjI$  
        Print #1, "type bsdf_data" gNBI?xs`p  
        Print #1, "format angles=deg bsdf=value scale=1" D=+sD"<|  
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        'Loop the file list, skip the two header lines and write the remaining data to file '1IH^<b  
        Dim lineArray() As String, curLine As Long e<pojb1Q  
        For Each curFile In fList (yVI<Os{a  
            Print "Merging data from file " & curFile 3J{'|3x  
            ReadFile( cDir & curFile, lineArray ) @B <_h+  
            For curLine = 2 To UBound(lineArray) qz):YHxT]n  
                Print #1, lineArray(curLine) 4+Kc  
            Next L T!X|O.  
        Next LPClE5  
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        'Close the output file :I8t}Wg  
        Close #1 owB)+  
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        Print "Finished merging RPC data for sample " & sampName @A%`\Ea%  
        Print "FRED formatted data file: " & Chr(9) & outFile 4O'ho0w7  
    End Sub TW$^]u~v  
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    'Utility function to read the contents of a file into an array of strings. ^YV[1~O  
    Function ReadFile(ByVal fileName As String, _ _,QUH"  
                      ByRef lineArray() As String) As Long Ea 1>]V  
    ) eV]M~K:  
        ReadFile = -1 #k6T_ki  
        Dim oFSO As Object 1U!CD-%(  
        Set oFSO = CreateObject("Scripting.FileSystemObject") !cZIoz  
        Erase lineArray U/;Vge8{  
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        Dim fid As Long 7(-<x@e  
        If oFSO.fileexists( fileName ) Then K,Vl.-4?  
            fid = FreeFile() _`_$U MK;  
            Open fileName For Input As fid J=Z"sU=  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3FfS+q*3S  
            Close fid L!RLw4  
        End If Z(cgI5Pu  
        Set oFSO = Nothing n$8A"'.M  
        Return UBound( lineArray ) +VDB\n   
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    End Function {[eY/)6H  
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    Sub GetFileList( ByVal in_dir As String, _ +a{>jzR  
                     ByRef in_flist() As String ) ^[6AOz+L  
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        'Redimension the file list array {Ffr l(*  
        Erase in_flist uQ}kq7gd  
    .#SWfAb2h  
        'Tracks how many files are found rx<fjA%  
        Dim fCount As Long pE#0949  
        fCount = 0 4R.#=]F  
    !nVuvsbv  
        'Recurse directory and search for text files -Cl0!}P4I  
        Dim f As String ! d(,t[cV  
        f = Dir$(in_dir & "*.txt") 8GX@76o  
        While f <> "" qohUxtnTK>  
            ReDim Preserve in_flist(fCount) wiZK-#\x  
            in_flist(fCount) = f "xKJ?8   
            fCount += 1 g~]FI  
            f = Dir$() {|50&]m  
        Wend !^%b|=[  
        ReDim Preserve in_flist(fCount-1) :'03*A_[  
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    End Sub MZ.Jkf(  
     
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