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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 ws$kwSHq  
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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 \J-D@b;  
    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。 FB3}M)G>M  
    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。 J M;WCV%NM  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 H6lZ<R{=  
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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。 y<l(F?_  
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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) &#!1 Y[e^  
    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 RP k'1nD  
    例如下所示: '*<I<? z;  
    Sample name:  EDF-C1-56 .d?LRf  
    Merging data from file EDF-C1-56 0-0.txt }:!X@C~  
    Finished merging RPC data for sample EDF-C1-56 eAjsMED  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt wVc ^l  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3`Xzp  
    a. 创建一个新的散射库 2G_]Y8  
    b. 散射模型命名 kS=nH9  
    c. 改变散射模型为“Tabulated BSDF”. NQX?&9L`r  
    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 ) wfpl]d!  
    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。 >]xW{71F@  
    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 -2>s#/%  
    g. 点击OK EP>Lh7E9n  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 gx',K1T  
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    脚本代码 G5K?Q+n   
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    '#Language "WWB-COM" (GC5r#AnS  
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    Option Explicit ,aGIq. *v  
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    Sub Main wy#>Aq  
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        'Cleanup oz)4YBf  
        ClearOutputWindow() 1"75+Q>D  
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        Print "Merging RPC Photonics BSDF Data Files" s%`l>#H  
        SetTextColor(255,0,0) 5`+9<8V  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." n%#3xo a  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." "~._G5i.  
        SetTextColor(0,0,0) 7pQ 5`;P  
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        'Current directory of this script (should be the same as the text files being merged) {*TB }Xsr,  
        Dim cDir As String |N"K83_pr  
        cDir = MacroDir$ & "\" m"'LT0nur  
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        'Array which will be populated with the list of files to be merged R=D}([pi  
        Dim fList() As String, curFile As String .5o~^  
        GetFileList( cDir, fList ) W;2J~V!c  
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        Print "" nKS*y*  
        Print "Files found for merging:" #jG?{j3;?  
        For Each curFile In fList D&2NO/ R  
            Print Chr(9) & curFile adIrrK  
        Next o:W*#dt  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. G'#u!<(^h  
        Dim nameArray() As String, sampName As String !/u  
        nameArray = Split(fList(0)," 0-0.txt") W&R67ff|  
        sampName  = nameArray(0) +~aIT=i3  
        Print "" AG9DJ{T  
        Print "Sample name: " & Chr(9) & sampName 5[jS(1a`c  
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        'Open an output file and write the FRED header data ![\P/1p  
        Dim outFile As String ej&.tNvq  
        outFile = cDir & sampName & "_FRED.txt" saP%T~  
        Open outFile For Output As #1 S`zu.8%5  
        Print #1, "type bsdf_data" Nc{&AV8Y_v  
        Print #1, "format angles=deg bsdf=value scale=1" VrP{U-`  
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        'Loop the file list, skip the two header lines and write the remaining data to file 5R~M@   
        Dim lineArray() As String, curLine As Long :??W3ROn  
        For Each curFile In fList .BBJhXtrdu  
            Print "Merging data from file " & curFile `x#S. b  
            ReadFile( cDir & curFile, lineArray ) {.A N4  
            For curLine = 2 To UBound(lineArray) /KF@Un_Ow  
                Print #1, lineArray(curLine) sL~4 ~178  
            Next EJTM >Rpor  
        Next 6',Hs  
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        'Close the output file kBcTXl  
        Close #1 ?{aJ#w   
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        Print "Finished merging RPC data for sample " & sampName MQx1|>rG  
        Print "FRED formatted data file: " & Chr(9) & outFile }BI6dZ~2A  
    End Sub 76@W:L*J$J  
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    'Utility function to read the contents of a file into an array of strings. 5G\OINxy  
    Function ReadFile(ByVal fileName As String, _ =LV-n  
                      ByRef lineArray() As String) As Long !(?7V  
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        ReadFile = -1 \|QB;7u  
        Dim oFSO As Object #U L75  
        Set oFSO = CreateObject("Scripting.FileSystemObject") v/rBjUc+X  
        Erase lineArray CE96e y  
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        Dim fid As Long $ MH;v_'a  
        If oFSO.fileexists( fileName ) Then 5Ex[}y9L`  
            fid = FreeFile() uuwJ-  
            Open fileName For Input As fid x cAs}y}  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) V.*M;T\i  
            Close fid _3 oo%?}  
        End If =O0A(ca"g  
        Set oFSO = Nothing ;BH.,{*@B  
        Return UBound( lineArray ) GLecBF+>F  
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    End Function u_' -vZ_  
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    Sub GetFileList( ByVal in_dir As String, _ Q%d%Io\-t  
                     ByRef in_flist() As String ) "Ux(nt  
    !;*flr`/  
        'Redimension the file list array 83Rs1}*  
        Erase in_flist H i8V=+  
    B//*hH >F  
        'Tracks how many files are found }M%3  
        Dim fCount As Long ^0|:  
        fCount = 0 G-9i   
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        'Recurse directory and search for text files j#2Xw25  
        Dim f As String "o`?-bQ:  
        f = Dir$(in_dir & "*.txt") ZwsQ}5  
        While f <> "" lAi5sN)|$  
            ReDim Preserve in_flist(fCount) P7=`P  
            in_flist(fCount) = f BT8)t.+pv  
            fCount += 1 N7lg6$s Aj  
            f = Dir$() "A+7G5  
        Wend H%Vf$1/TF  
        ReDim Preserve in_flist(fCount-1) oOND]>  
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    End Sub ynM~&]fk#k  
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