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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 knX0b$$  
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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 Pk[:+. f(  
    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。 ^,')1r,  
    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。 U>6MT@\  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 n'=-bj`  
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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。 Mk"+*G  
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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) VO3&!uOd  
    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 }\}pSqW  
    例如下所示: wXp A1,i  
    Sample name:  EDF-C1-56 <qN0Q7  
    Merging data from file EDF-C1-56 0-0.txt V{;!vt~  
    Finished merging RPC data for sample EDF-C1-56 5bM/ v  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9K~2!<  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pDb5t>  
    a. 创建一个新的散射库 gO%#'Eb2  
    b. 散射模型命名 q%TWtQS  
    c. 改变散射模型为“Tabulated BSDF”. &=H{ 36i@  
    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 ) $A"kHS7T  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 M3@Wb@  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 jW*|Mu>2  
    g. 点击OK ?|'+5$  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;vvO#3DWM  
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    脚本代码 >f#P(  
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    '#Language "WWB-COM" }]_/:KUt  
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    Option Explicit zvV<0 Z  
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    Sub Main /^^t>L  
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        'Cleanup n4Nb,)M  
        ClearOutputWindow() n/#zx:d?  
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        Print "Merging RPC Photonics BSDF Data Files" 0 3fCn"  
        SetTextColor(255,0,0) G'IqAKJ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." "a))TV%N  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." cHOtMPyQ  
        SetTextColor(0,0,0) <+UEM~)  
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        'Current directory of this script (should be the same as the text files being merged) Y $hYW  
        Dim cDir As String A^:[+PJHN  
        cDir = MacroDir$ & "\" \7PPFKS  
    fe PH=C  
        'Array which will be populated with the list of files to be merged CsHHJgx  
        Dim fList() As String, curFile As String tJ[yx_mf  
        GetFileList( cDir, fList ) e5G)83[=  
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        Print "" DhZuQpH  
        Print "Files found for merging:" 51j5AbFQ"  
        For Each curFile In fList 1=(jpy  
            Print Chr(9) & curFile n&ZA rJ  
        Next g^|}e?  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. d%_=r." Y  
        Dim nameArray() As String, sampName As String #\s*>Z  
        nameArray = Split(fList(0)," 0-0.txt") li'h&!|]  
        sampName  = nameArray(0) G2 A#&86J{  
        Print "" 4?Pdld  
        Print "Sample name: " & Chr(9) & sampName {<&i4;  
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        'Open an output file and write the FRED header data u3 k%  
        Dim outFile As String Cbu/7z   
        outFile = cDir & sampName & "_FRED.txt" `)V1GR2 ES  
        Open outFile For Output As #1 a(AKVk\  
        Print #1, "type bsdf_data" -!MrG68  
        Print #1, "format angles=deg bsdf=value scale=1" .4on7<-a  
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        'Loop the file list, skip the two header lines and write the remaining data to file MmiC%"7wt  
        Dim lineArray() As String, curLine As Long MU6|>{  
        For Each curFile In fList fy+fJ )4sj  
            Print "Merging data from file " & curFile S3#NGBZ/  
            ReadFile( cDir & curFile, lineArray ) -]""Jl^  
            For curLine = 2 To UBound(lineArray) sd4eJ  
                Print #1, lineArray(curLine) I\ e?v`e  
            Next {!!df.h  
        Next D4,kGU@  
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        'Close the output file gc(Gc vdB\  
        Close #1 LXYpP- E  
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        Print "Finished merging RPC data for sample " & sampName U\aP  
        Print "FRED formatted data file: " & Chr(9) & outFile .Zo%6[X  
    End Sub hOYm =r  
    +&hhj~I.  
    'Utility function to read the contents of a file into an array of strings. $VEG1]/svp  
    Function ReadFile(ByVal fileName As String, _ ^(z7?T  
                      ByRef lineArray() As String) As Long .*XELP=BT  
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        ReadFile = -1 @1+C*  
        Dim oFSO As Object ;R[  xo!  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 3 #GZ6:rVJ  
        Erase lineArray e7e6b-"_2  
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        Dim fid As Long m$N` Xj  
        If oFSO.fileexists( fileName ) Then WMy97*L<  
            fid = FreeFile() u.v 5!G  
            Open fileName For Input As fid [5[}2 B_t  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) m]H[$ Q  
            Close fid L8OW@)|  
        End If (Hk4~v6pqC  
        Set oFSO = Nothing bVfFhfh*  
        Return UBound( lineArray ) V11(EZJ/j  
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    End Function &UzeNL"]  
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    Sub GetFileList( ByVal in_dir As String, _ /|7@rH([{  
                     ByRef in_flist() As String ) BR&T,x/d  
    'I$-h<W  
        'Redimension the file list array 5x$/.U  
        Erase in_flist 9Z?P/ o  
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        'Tracks how many files are found DI9hy/T(  
        Dim fCount As Long b1+6I_u.  
        fCount = 0 t<~WDI|AN  
    /zt9;^e  
        'Recurse directory and search for text files C]@v60I  
        Dim f As String dA,irb I0W  
        f = Dir$(in_dir & "*.txt") Q 6>7{\8l  
        While f <> "" 'u9,L FO  
            ReDim Preserve in_flist(fCount) jbQ N<`!  
            in_flist(fCount) = f g%C!)UbT  
            fCount += 1 0*e)_l!  
            f = Dir$() TtZZjeg+V  
        Wend }iGpuoXT`  
        ReDim Preserve in_flist(fCount-1) R$>]7-N}  
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    End Sub ZtzSG@f  
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