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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 CUHT5J*sY  
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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 J3(E{w8Q  
    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。 H cyoNY  
    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。 QxN1N^a0  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 x}nBU q:  
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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。 u1Slu%^e  
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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) dgIH`<U$  
    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 Aq*?Q/pV  
    例如下所示: 1_#;+S  
    Sample name:  EDF-C1-56 q5L^>"  
    Merging data from file EDF-C1-56 0-0.txt IM7<z,*oF  
    Finished merging RPC data for sample EDF-C1-56 D7T|K :F)  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt AS@(]T#R  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 "M!m-]  
    a. 创建一个新的散射库 gua7<z6=eh  
    b. 散射模型命名 Lt=32SvTn  
    c. 改变散射模型为“Tabulated BSDF”. Rw%?@X3m]  
    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 ) 1kw*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。 xY#J((-iH  
    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 (XW'1@b  
    g. 点击OK =JgR c7  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [U8/nT  
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    脚本代码 Hz."4nhv  
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    '#Language "WWB-COM" N0Y4m_dm*  
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    Option Explicit [A/2 Ms  
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    Sub Main Z\EA!Cs3  
     \20} /&  
        'Cleanup Zfcf?&><  
        ClearOutputWindow() A8{ xZsH  
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        Print "Merging RPC Photonics BSDF Data Files" MO0NNVVi%U  
        SetTextColor(255,0,0) WV.hQX9P  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." $x+7.%1m)~  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." )=d)j^ t9  
        SetTextColor(0,0,0) )!\6 "{  
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        'Current directory of this script (should be the same as the text files being merged)  <{Y3}Q  
        Dim cDir As String SFd_k9  
        cDir = MacroDir$ & "\" f"P866@oWn  
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        'Array which will be populated with the list of files to be merged 1' U  
        Dim fList() As String, curFile As String ;Vat\,45pg  
        GetFileList( cDir, fList ) wCg7JW#  
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        Print "" 4S ~kNp$  
        Print "Files found for merging:" CvE^t#Bok  
        For Each curFile In fList >Ti%Th,  
            Print Chr(9) & curFile 7Tdx*1 U  
        Next y zp#  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8I RKCuV  
        Dim nameArray() As String, sampName As String 7<!x:G?C  
        nameArray = Split(fList(0)," 0-0.txt") qz]qG=wmL  
        sampName  = nameArray(0) \f? K74  
        Print "" P@ew' JL%  
        Print "Sample name: " & Chr(9) & sampName >pLJ ,Z  
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        'Open an output file and write the FRED header data .,xyE--;d  
        Dim outFile As String O}Pqbx&  
        outFile = cDir & sampName & "_FRED.txt" # euG$(  
        Open outFile For Output As #1 ~LpkA`Hn!  
        Print #1, "type bsdf_data" U|tacO5w`  
        Print #1, "format angles=deg bsdf=value scale=1" [;Lgbgt3f  
    'LPyh ;!f  
        'Loop the file list, skip the two header lines and write the remaining data to file ZH;4e<gg  
        Dim lineArray() As String, curLine As Long !>> A@3  
        For Each curFile In fList 3= sBe HL  
            Print "Merging data from file " & curFile F&R*njJcc  
            ReadFile( cDir & curFile, lineArray ) LxhS 9  
            For curLine = 2 To UBound(lineArray) Y Z+G7D>  
                Print #1, lineArray(curLine)  yP+<kv4  
            Next }k-8PG =  
        Next U'ctO%  
    vRC >=y*=  
        'Close the output file |YROxY"ML  
        Close #1 ydYsmTr  
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        Print "Finished merging RPC data for sample " & sampName dv\bkDF4A  
        Print "FRED formatted data file: " & Chr(9) & outFile "/e)v{  
    End Sub  4bA^Gq  
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    'Utility function to read the contents of a file into an array of strings. #z.n?d2Gd  
    Function ReadFile(ByVal fileName As String, _ 06^/zr  
                      ByRef lineArray() As String) As Long b`D]L/}pr  
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        ReadFile = -1 OS@uGp=  
        Dim oFSO As Object -_t4A *  
        Set oFSO = CreateObject("Scripting.FileSystemObject")  d=^QK{8  
        Erase lineArray ;K\2/"$QD  
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        Dim fid As Long Eej Lso#\  
        If oFSO.fileexists( fileName ) Then #W)m({}  
            fid = FreeFile() B;(U ?gC  
            Open fileName For Input As fid M{G}-QK_.  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) CdRJ@Lf  
            Close fid  Jk(V ]  
        End If ~M^[  
        Set oFSO = Nothing [%bGs1U  
        Return UBound( lineArray ) ,b!D8{W"N  
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    End Function 0)d='3S  
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    Sub GetFileList( ByVal in_dir As String, _ u*2?Gky  
                     ByRef in_flist() As String ) 3#t#NW*e  
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        'Redimension the file list array ,M{G X  
        Erase in_flist 4Z%1eOR9V  
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        'Tracks how many files are found )1#/@cU  
        Dim fCount As Long #)~u YQ  
        fCount = 0 K:'^f? P  
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        'Recurse directory and search for text files C\5G43`  
        Dim f As String YT+b{   
        f = Dir$(in_dir & "*.txt") )TiM>{  
        While f <> "" XjL3Ar*  
            ReDim Preserve in_flist(fCount) /.7RWy`  
            in_flist(fCount) = f S=) c7t?a  
            fCount += 1 YdO*5Gb6  
            f = Dir$() e7"T37  
        Wend z7IJSj1gQI  
        ReDim Preserve in_flist(fCount-1) <(>t"<  
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    End Sub o 7kg.w|  
     
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