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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: hjs[$ ,1  
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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>J  
    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。 ~}PB&`%7  
    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。 "'~55bG  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 oYI7 .w  
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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。 73 ix4C  
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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) :VGvL"Kro  
    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 &3#19v7/  
    例如下所示: 7&-B6Y4  
    Sample name:  EDF-C1-56 vu Vcv  
    Merging data from file EDF-C1-56 0-0.txt 2guWWFS  
    Finished merging RPC data for sample EDF-C1-56 L/t'|<m  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $t}t'uJ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8 6y)+h`  
    a. 创建一个新的散射库 K*NCIIDh  
    b. 散射模型命名 A 0~uv4MC  
    c. 改变散射模型为“Tabulated BSDF”. xy;u"JY*  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ^}8qPBz  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 dTcrJ|/Y  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, =Kqb V{!  
    g. 点击OK .ww~'5b0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 HtFc+%=  
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    脚本代码: X?kw=x{2P  
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    '#Language "WWB-COM" dX^ ^ @7  
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    Option Explicit \%[sv@P9s  
    F/.nr  
    Sub Main QPr29  
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        'Cleanup ^E-BB 6D  
        ClearOutputWindow() 5\S s`#g  
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        Print "Merging RPC Photonics BSDF Data Files" CvkZ<i){  
        SetTextColor(255,0,0) x6N)T4J(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." A~0eJaq+  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Pnl+.?  
        SetTextColor(0,0,0) ] 40@yrc  
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        'Current directory of this script (should be the same as the text files being merged) ~[a6  
        Dim cDir As String ?E +[  
        cDir = MacroDir$ & "\" Z/G`8|A  
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        'Array which will be populated with the list of files to be merged K)DpC*j  
        Dim fList() As String, curFile As String Iy[TEB  
        GetFileList( cDir, fList ) 2J;_9 g&M  
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        Print "" rvEX ;8TS  
        Print "Files found for merging:" a)lS)*Y  
        For Each curFile In fList E! "N}v  
            Print Chr(9) & curFile {f1iys'Om  
        Next (Y!{ UNq5  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. % H/V iC  
        Dim nameArray() As String, sampName As String RwyX,|  
        nameArray = Split(fList(0)," 0-0.txt") X^o0t^  
        sampName  = nameArray(0) 2pQ29  
        Print "" xwSi.~.  
        Print "Sample name: " & Chr(9) & sampName o{[w6^D7  
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        'Open an output file and write the FRED header data y?Cq{(  
        Dim outFile As String XU5GmGu_+  
        outFile = cDir & sampName & "_FRED.txt" (ay((|)  
        Open outFile For Output As #1 0+{CN|0  
        Print #1, "type bsdf_data" }j`#s  
        Print #1, "format angles=deg bsdf=value scale=1" P!xN]or]u  
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        'Loop the file list, skip the two header lines and write the remaining data to file nVyV]'-z  
        Dim lineArray() As String, curLine As Long 8*&|Q1`K:  
        For Each curFile In fList rK~Obv  
            Print "Merging data from file " & curFile )=TS)C4  
            ReadFile( cDir & curFile, lineArray ) ;s\ck:Xg  
            For curLine = 2 To UBound(lineArray) /0 2-0mNv  
                Print #1, lineArray(curLine) wGLSei-s  
            Next Xte"tf9(C  
        Next K#;EjR4H  
    :meq4!g{1  
        'Close the output file wX+KW0|>  
        Close #1 )0XJOm  
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        Print "Finished merging RPC data for sample " & sampName O>,Rsj!e  
        Print "FRED formatted data file: " & Chr(9) & outFile Lq#$q>!K  
    End Sub \f4JIsZ-&  
    \Z8:^ct.P  
    'Utility function to read the contents of a file into an array of strings. GUcGu5tw:  
    Function ReadFile(ByVal fileName As String, _ 9s2 N!bx  
                      ByRef lineArray() As String) As Long vYNu=vnM  
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        ReadFile = -1 ydMfV-  
        Dim oFSO As Object hQ_g OI  
        Set oFSO = CreateObject("Scripting.FileSystemObject") FA$1&Fu3Y  
        Erase lineArray G[lNgVbU@  
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        Dim fid As Long rUDMQxLruV  
        If oFSO.fileexists( fileName ) Then =bh.V@*  
            fid = FreeFile() "JpnmE[`  
            Open fileName For Input As fid m\eYm;R Vj  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) QHPC?a6CD  
            Close fid f9a_:]F  
        End If N VBWF  
        Set oFSO = Nothing s#>``E!  
        Return UBound( lineArray ) F.$NYr/|y  
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    End Function ; %mYsQ  
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    Sub GetFileList( ByVal in_dir As String, _ q3e^vMK"  
                     ByRef in_flist() As String ) -_T@kg[0zB  
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        'Redimension the file list array bR}=bp4K  
        Erase in_flist \[Q*d  
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        'Tracks how many files are found |.{[%OJP  
        Dim fCount As Long uoMDf{d  
        fCount = 0 L@x#:s=  
    ByivV2qd{  
        'Recurse directory and search for text files ~T:L0||.%9  
        Dim f As String i1ss}JJp*  
        f = Dir$(in_dir & "*.txt") c=u'#|/eb  
        While f <> "" !A=>B=.|D  
            ReDim Preserve in_flist(fCount) <?Y.w1  
            in_flist(fCount) = f ]vUTb9>{?  
            fCount += 1 vJfj1 f  
            f = Dir$() 57rH`UFXH  
        Wend tish%Qnpd  
        ReDim Preserve in_flist(fCount-1) o}6d[G>  
    "2>_eZ#b  
    End Sub W8Aii'Q8C/  
     
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