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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
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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 a{QHv0goG  
    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。 ^/2n[orl5  
    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。 !t{3IE  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 o';sHa'  
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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。 $VhUZGuG>  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ?3Se=7 k  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 !!b5vzyve  
    例如下所示: 1 +O- g  
    Sample name:  EDF-C1-56 pN&5vu30  
    Merging data from file EDF-C1-56 0-0.txt OA_:_%a(  
    Finished merging RPC data for sample EDF-C1-56 .KGW#Qk8  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt S`BLwnU`#  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xpKD 'O=T  
    a. 创建一个新的散射库 KO<Yc`Fs  
    b. 散射模型命名 ddmTMfH  
    c. 改变散射模型为“Tabulated BSDF”. 5v=%pQbY  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) v-3In\T=^  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Z TWbe  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4T`u?T]  
    g. 点击OK @3K)VjY7  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bBc<yaN  
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    脚本代码 *T*=~Y4kE  
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    '#Language "WWB-COM" j#"?Oe{_1  
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    Option Explicit B t-o:)pa  
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    Sub Main Aj#CB.y  
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        'Cleanup <- Q=h?D  
        ClearOutputWindow() "D'A7DA  
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        Print "Merging RPC Photonics BSDF Data Files" _$s9o$8$  
        SetTextColor(255,0,0) 8 qt,sU  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." t?L;k+sMM  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." wbshKkUh_*  
        SetTextColor(0,0,0) 9Ruj_U  
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        'Current directory of this script (should be the same as the text files being merged) ~&4Hc%*IB  
        Dim cDir As String Kgbgp mW  
        cDir = MacroDir$ & "\" jwgXq(  
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        'Array which will be populated with the list of files to be merged 3xWeN#T0  
        Dim fList() As String, curFile As String fHCLsI  
        GetFileList( cDir, fList ) ,o& &d.  
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        Print "" r j#K5/df  
        Print "Files found for merging:" %Wkvo-rOq  
        For Each curFile In fList 8rAOs\ys  
            Print Chr(9) & curFile cH?j@-pY  
        Next I$9^i#O'3  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. dElOy?v  
        Dim nameArray() As String, sampName As String ~^cx a%  
        nameArray = Split(fList(0)," 0-0.txt") {5QIQ  
        sampName  = nameArray(0) uV!Ax *'  
        Print "" :^tw!U%y1  
        Print "Sample name: " & Chr(9) & sampName l69&-Nyg  
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        'Open an output file and write the FRED header data T3,"g=  
        Dim outFile As String l)m\i_r:  
        outFile = cDir & sampName & "_FRED.txt" sy=M#WGS  
        Open outFile For Output As #1 /_5I}{  
        Print #1, "type bsdf_data" 1{i)7 :Y  
        Print #1, "format angles=deg bsdf=value scale=1" I&?(=i)N  
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        'Loop the file list, skip the two header lines and write the remaining data to file ]ppi962Z  
        Dim lineArray() As String, curLine As Long D::$YR ~R  
        For Each curFile In fList fCdd,,,}  
            Print "Merging data from file " & curFile 55MrsiW  
            ReadFile( cDir & curFile, lineArray ) la:i!q AH  
            For curLine = 2 To UBound(lineArray) u@tJu'X  
                Print #1, lineArray(curLine)  17AJT  
            Next ifTMoC%  
        Next i_Dv+^&zV  
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        'Close the output file Ca?5bCI,  
        Close #1 wegu1Ny  
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        Print "Finished merging RPC data for sample " & sampName >Ig%|4Hw  
        Print "FRED formatted data file: " & Chr(9) & outFile C` ?6`$Y  
    End Sub dznHR6x  
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    'Utility function to read the contents of a file into an array of strings. .V G$`g"  
    Function ReadFile(ByVal fileName As String, _ -\6nT'P  
                      ByRef lineArray() As String) As Long F(c~D0  
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        ReadFile = -1 @ c,KK~{  
        Dim oFSO As Object }_93}e  
        Set oFSO = CreateObject("Scripting.FileSystemObject") _Mq0QQ42  
        Erase lineArray MF:]J  
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        Dim fid As Long |g<1n  
        If oFSO.fileexists( fileName ) Then [ lZo'o  
            fid = FreeFile() 7Gb1[3  
            Open fileName For Input As fid AoB~ZWq  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) gZ%wm Y  
            Close fid #U45;idp  
        End If os6p1"_\f  
        Set oFSO = Nothing R|aA6} /I  
        Return UBound( lineArray ) :U)>um34e  
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    End Function '{=dEEi  
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    Sub GetFileList( ByVal in_dir As String, _  +]Ca_`  
                     ByRef in_flist() As String ) $ZX^JWq  
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        'Redimension the file list array ;d$PQi  
        Erase in_flist 9l) .L L  
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        'Tracks how many files are found \pI)tnu6'U  
        Dim fCount As Long > w:+nG/r  
        fCount = 0 v,t;!u,40  
    %\6ns  
        'Recurse directory and search for text files y,&.<Yc  
        Dim f As String AZ' "M{wiI  
        f = Dir$(in_dir & "*.txt") cpz'upVOZ  
        While f <> "" `L p3snS  
            ReDim Preserve in_flist(fCount) T \%{zz_(  
            in_flist(fCount) = f E^uau=F  
            fCount += 1 rmpx8C Y"  
            f = Dir$() 3GVE/GtU  
        Wend BG:l Zj'I  
        ReDim Preserve in_flist(fCount-1) /3|uU  
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    End Sub <L|eY(:  
     
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