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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: 2025-07-22
    摘要: U9]&~jR  
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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: qS}pv  
    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。 \\i$zRi  
    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。 Z&j?@k,k  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 +U= !svE  
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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。 "R9^X3;  
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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) 8@J5tFJ&%  
    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 to"[r  
    例如下所示: \(a!U,]LM  
    Sample name:  EDF-C1-56 ~u+|NtF  
    Merging data from file EDF-C1-56 0-0.txt bf&k:.v'8  
    Finished merging RPC data for sample EDF-C1-56 h(Ccm44  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt os~}5QJ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 qk=0ovUzg  
    a. 创建一个新的散射库 ?QfomTT  
    b. 散射模型命名 Fl;!'1  
    c. 改变散射模型为“Tabulated BSDF”. Jk3V]u  
    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 ) =as\Tp#d  
    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。 SdOE^_@:  
    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, Imm|5-qJ  
    g. 点击OK R4P$zB_<2  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3PU'd^  
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    脚本代码: `p{,C`g,R  
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    '#Language "WWB-COM" K`% I!Br  
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    Option Explicit H G)c\b  
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    Sub Main h`HdM58CQ  
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        'Cleanup vspub^;5\  
        ClearOutputWindow() SP |R4*KY  
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        Print "Merging RPC Photonics BSDF Data Files" ?B`Yq\L)  
        SetTextColor(255,0,0) zgR@-OtFZ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." m"RE[dQ  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." !ii'hwFm$  
        SetTextColor(0,0,0) >W[#-jA_Z  
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        'Current directory of this script (should be the same as the text files being merged) )ls<"WTC.  
        Dim cDir As String ^S'tMT_  
        cDir = MacroDir$ & "\" WCPl}7>  
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        'Array which will be populated with the list of files to be merged WJN}d-S=^  
        Dim fList() As String, curFile As String uRu)iBd D  
        GetFileList( cDir, fList ) z LHE;  
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        Print "" >4lT0~V/  
        Print "Files found for merging:" zkrcsc\Z~0  
        For Each curFile In fList wRi` L7  
            Print Chr(9) & curFile .0zNt  
        Next ; 3WA-nn  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. =z$XqT.'  
        Dim nameArray() As String, sampName As String &QL!Y{=Y6  
        nameArray = Split(fList(0)," 0-0.txt") 8x J]K  
        sampName  = nameArray(0) @xI:ZtM  
        Print "" A/4HR]  
        Print "Sample name: " & Chr(9) & sampName 5V{zdS=  
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        'Open an output file and write the FRED header data +Eh^j3W  
        Dim outFile As String 7~V,=WEe  
        outFile = cDir & sampName & "_FRED.txt" *4tJ|m6"Y6  
        Open outFile For Output As #1 )KLsa`RV:  
        Print #1, "type bsdf_data"  `=h`:`  
        Print #1, "format angles=deg bsdf=value scale=1" iS"(  
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        'Loop the file list, skip the two header lines and write the remaining data to file bf3Njma%  
        Dim lineArray() As String, curLine As Long k'K&GF1B  
        For Each curFile In fList Z$? Ql@M  
            Print "Merging data from file " & curFile %EooGHGF?  
            ReadFile( cDir & curFile, lineArray ) {G D<s))  
            For curLine = 2 To UBound(lineArray) 7.o:(P1??g  
                Print #1, lineArray(curLine) V~uH)IMkh7  
            Next domaD"C  
        Next PmGW\E[ni  
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        'Close the output file >7VO ytc  
        Close #1 c_fx,; ;  
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        Print "Finished merging RPC data for sample " & sampName ZO2$Aan  
        Print "FRED formatted data file: " & Chr(9) & outFile `KgWaf-  
    End Sub Qw ukhD7  
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    'Utility function to read the contents of a file into an array of strings. 4Em mh=A  
    Function ReadFile(ByVal fileName As String, _ y0d a8sd)  
                      ByRef lineArray() As String) As Long %U&O \GB  
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        ReadFile = -1 R N1q/H|  
        Dim oFSO As Object ?Sq?f?  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 6_m5%c~;+r  
        Erase lineArray }jQxwi)  
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        Dim fid As Long <#s=78 g.3  
        If oFSO.fileexists( fileName ) Then * ?a-m\  
            fid = FreeFile() cViEvS r  
            Open fileName For Input As fid 9U_uw Rv2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) \G?GX  
            Close fid xm }9(EJ  
        End If (RR:{4I  
        Set oFSO = Nothing G/nSF:rp  
        Return UBound( lineArray ) :@:i*2=  
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    End Function ,m-z D  
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    Sub GetFileList( ByVal in_dir As String, _ F_9eju^|  
                     ByRef in_flist() As String ) 6q[|U_3I@  
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        'Redimension the file list array [i 18$q5D  
        Erase in_flist qn VxP&  
    %T hY6y(  
        'Tracks how many files are found >~-8RM  
        Dim fCount As Long 2NHkK_B1P  
        fCount = 0 wo($7'.@  
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        'Recurse directory and search for text files v=A ]#O%  
        Dim f As String ^tS{a*Yn  
        f = Dir$(in_dir & "*.txt") )~ {T  
        While f <> "" O,`#h*{N  
            ReDim Preserve in_flist(fCount) 'u6T^YS  
            in_flist(fCount) = f w-%V9]J1  
            fCount += 1 Y40`~  
            f = Dir$() =.=4P~T&  
        Wend "@1e0`n Q  
        ReDim Preserve in_flist(fCount-1) ^gb3DNV~y  
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    End Sub 9`P<|(  
     
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