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    [分享]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: 2020-12-15
    摘要 1=Npq=d  
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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 [!Uzw 2  
    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。 @~WSWlQW  
    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。 3%`asCW$  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 *\W *,D.I  
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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。 tR`'( *wh  
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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) |Uf[x[  
    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 xnz(hz6  
    例如下所示: 7,vvL8\NHu  
    Sample name:  EDF-C1-56 Wk3R6 V  
    Merging data from file EDF-C1-56 0-0.txt "^?|=sQ  
    Finished merging RPC data for sample EDF-C1-56 !{On_>` ,  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @|A w T  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /m#!<t7  
    a. 创建一个新的散射库 .4I "[$?Q  
    b. 散射模型命名 s Yp?V\Y"  
    c. 改变散射模型为“Tabulated BSDF”. 8&d s  
    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 ) B^8]quOH  
    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。 -TL `nGF  
    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 NR98I7  
    g. 点击OK V* :Q~ ^  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 WsHC%+\'  
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    脚本代码 G3 h&nH,>  
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    '#Language "WWB-COM" ;4E(n  
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    Option Explicit $inpiO|s  
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    Sub Main 'VH%cz*  
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        'Cleanup i^Ba?r;*  
        ClearOutputWindow() s]=bg+v?j  
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        Print "Merging RPC Photonics BSDF Data Files" 3WH"NC-O<  
        SetTextColor(255,0,0) Z{' .fq2A  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 1w30Vj2<  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." <W$Ig@4[.d  
        SetTextColor(0,0,0) c UJUZ@ol  
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        'Current directory of this script (should be the same as the text files being merged) D4';QCwo  
        Dim cDir As String .W[[Z;D  
        cDir = MacroDir$ & "\" B Q) 1)8r  
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        'Array which will be populated with the list of files to be merged y[L7=Td  
        Dim fList() As String, curFile As String Q#wl1P  
        GetFileList( cDir, fList ) 7&I+mw/X  
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        Print "" jg,oGtRz  
        Print "Files found for merging:" ,7wxVR%Ys  
        For Each curFile In fList J~\`8cds  
            Print Chr(9) & curFile d-cK`pSB  
        Next ^N{Lau  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. x+mf QcSD&  
        Dim nameArray() As String, sampName As String R78=im7  
        nameArray = Split(fList(0)," 0-0.txt") x{Gdr51%  
        sampName  = nameArray(0) T3-8AUCK8?  
        Print "" 4^? J BpBZ  
        Print "Sample name: " & Chr(9) & sampName rXortK#\%  
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        'Open an output file and write the FRED header data l}#z#L2,`  
        Dim outFile As String Y~R['u,  
        outFile = cDir & sampName & "_FRED.txt" n\U3f M>N  
        Open outFile For Output As #1 &HS6}  
        Print #1, "type bsdf_data" Obd};&6Q  
        Print #1, "format angles=deg bsdf=value scale=1" U}r^M( s!  
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        'Loop the file list, skip the two header lines and write the remaining data to file uTSTBI4t  
        Dim lineArray() As String, curLine As Long C>1fL6ct  
        For Each curFile In fList |fQl0hL  
            Print "Merging data from file " & curFile q;XO1Se  
            ReadFile( cDir & curFile, lineArray ) +`@)87O  
            For curLine = 2 To UBound(lineArray) LTSoo.dE  
                Print #1, lineArray(curLine) ]+ \]2`?  
            Next "cK@Yo  
        Next y 093-  
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        'Close the output file 8SG*7[T7  
        Close #1 K >-)O=$s  
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        Print "Finished merging RPC data for sample " & sampName zsQhydTR  
        Print "FRED formatted data file: " & Chr(9) & outFile _~^JRC[q  
    End Sub Pf?*bI  
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    'Utility function to read the contents of a file into an array of strings. 'dnTu@mUT  
    Function ReadFile(ByVal fileName As String, _ (l|:$%[0  
                      ByRef lineArray() As String) As Long ("UzMr,  
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        ReadFile = -1 R4?OFhN9  
        Dim oFSO As Object G!y~Y]e  
        Set oFSO = CreateObject("Scripting.FileSystemObject") (x.O]8GKP  
        Erase lineArray 0K0[mC}ZwM  
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        Dim fid As Long ~@3X&E0S  
        If oFSO.fileexists( fileName ) Then QasUgZ  
            fid = FreeFile() aNqhxvwf  
            Open fileName For Input As fid >bKN$,Qen  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) }~Am{Er <l  
            Close fid U[!x 0M  
        End If D@M ZTb  
        Set oFSO = Nothing XT n`$}nz  
        Return UBound( lineArray ) [Rqv49n*V  
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    End Function z}Qt6na]-  
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    Sub GetFileList( ByVal in_dir As String, _ {V> >a  
                     ByRef in_flist() As String ) `%8byy@$  
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        'Redimension the file list array HzW`j"\  
        Erase in_flist 7 TTU&7l~  
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        'Tracks how many files are found +) pO82  
        Dim fCount As Long sC8C><y  
        fCount = 0 I?) .D?o  
    Z#-:zD7_  
        'Recurse directory and search for text files l?+67cQLA  
        Dim f As String MjO.s+I  
        f = Dir$(in_dir & "*.txt") V b=Oz  
        While f <> "" 0?D`|x_  
            ReDim Preserve in_flist(fCount) 07zbx6:t  
            in_flist(fCount) = f g$++\%k&  
            fCount += 1 piZ0KA"  
            f = Dir$() ebbC`eFD  
        Wend CM; r\,o  
        ReDim Preserve in_flist(fCount-1) @"`J~uK  
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    End Sub `|p3@e  
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