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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 \\qw"w9  
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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 qYMTud[Vf  
    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。 ,UdTUw~F  
    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。 ]0HlPP:2  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 4g.y$  
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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。 Xeg g2.Kk  
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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) ~PT( /L  
    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 m|O7@N  
    例如下所示: BO b#9r  
    Sample name:  EDF-C1-56 W*hRYgaX3  
    Merging data from file EDF-C1-56 0-0.txt i%+p\eeq*  
    Finished merging RPC data for sample EDF-C1-56 %} _{_Z  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %#rH~E  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 =NH p%|  
    a. 创建一个新的散射库 ^n|u$gIF8  
    b. 散射模型命名 zL @ZNH  
    c. 改变散射模型为“Tabulated BSDF”. gE/O29Y  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) -vXX u;frt  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 bP`.teO\  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 mis cmD  
    g. 点击OK +oY[uF  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7P`|wNq  
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    脚本代码 n lsQf3  
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    '#Language "WWB-COM" ,%+i}H,3  
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    Option Explicit g4WN+y`  
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    Sub Main 8_MR7'C1hi  
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        'Cleanup C@` eYi  
        ClearOutputWindow() +$:bzo_u  
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        Print "Merging RPC Photonics BSDF Data Files" 5-Vdq  
        SetTextColor(255,0,0) Kr!(<i  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." swvn*xr  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." p/B&R@%  
        SetTextColor(0,0,0) \gRX:i#n  
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        'Current directory of this script (should be the same as the text files being merged) DFKU?#R  
        Dim cDir As String m}] bP  
        cDir = MacroDir$ & "\" K@P5]}'#  
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        'Array which will be populated with the list of files to be merged u/e-m/  
        Dim fList() As String, curFile As String 7hq*+e  
        GetFileList( cDir, fList ) 0^4uZeW?  
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        Print "" =PiDZS^"  
        Print "Files found for merging:" =dD<[Iz6  
        For Each curFile In fList ,[}5@cS  
            Print Chr(9) & curFile dUOvv/,FZT  
        Next I"4j152P|  
    .'C$w1[w  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7@u0;5p|  
        Dim nameArray() As String, sampName As String O1pBr=+j+{  
        nameArray = Split(fList(0)," 0-0.txt") pOlo_na}[  
        sampName  = nameArray(0) P8DY*B k  
        Print "" l@Vl^f~P  
        Print "Sample name: " & Chr(9) & sampName Ep/4o< N(  
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        'Open an output file and write the FRED header data tuuc9H4B  
        Dim outFile As String .L[WvAo  
        outFile = cDir & sampName & "_FRED.txt" _D:#M  
        Open outFile For Output As #1 L;=:OX 0  
        Print #1, "type bsdf_data" {dV#"+  
        Print #1, "format angles=deg bsdf=value scale=1" c#M 'Mye  
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        'Loop the file list, skip the two header lines and write the remaining data to file vr<6j/ty  
        Dim lineArray() As String, curLine As Long beFVjVVHq  
        For Each curFile In fList ">]v'h(s  
            Print "Merging data from file " & curFile O^v^GG=e;C  
            ReadFile( cDir & curFile, lineArray ) @O#4duM4Qz  
            For curLine = 2 To UBound(lineArray) pmd=3,D'u  
                Print #1, lineArray(curLine) JX,&im*BG  
            Next >;}np F>  
        Next r- 0BLq]~{  
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        'Close the output file } )O ^xF ~  
        Close #1 |><hdBQXX<  
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        Print "Finished merging RPC data for sample " & sampName SovK|b &  
        Print "FRED formatted data file: " & Chr(9) & outFile x g~q'>  
    End Sub 1J<Wth{  
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    'Utility function to read the contents of a file into an array of strings. rMIr&T  
    Function ReadFile(ByVal fileName As String, _ bj4cW\b(  
                      ByRef lineArray() As String) As Long ^& ZlV  
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        ReadFile = -1 z5-vx`  
        Dim oFSO As Object y6ntGrZ}$  
        Set oFSO = CreateObject("Scripting.FileSystemObject") [uP_F,Y/  
        Erase lineArray |LA./%U  
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        Dim fid As Long `2\vDy1,j  
        If oFSO.fileexists( fileName ) Then 9,=3D2x&  
            fid = FreeFile() E+Z//)1Z  
            Open fileName For Input As fid Yz;Hu$/  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) WUx}+3eWv  
            Close fid _?&$@c  
        End If 'L)@tkklp  
        Set oFSO = Nothing dABmK;  
        Return UBound( lineArray ) So?SBh1C  
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    End Function wvsKn YKX  
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    Sub GetFileList( ByVal in_dir As String, _ ss'#sPX  
                     ByRef in_flist() As String ) hXdc5 ?i?  
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        'Redimension the file list array ,<n >g;  
        Erase in_flist DK 4 8  
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        'Tracks how many files are found {Y-<#U~iH  
        Dim fCount As Long o %sBU  
        fCount = 0 /,dcr*  
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        'Recurse directory and search for text files 3 RG*:9  
        Dim f As String VE5w!of  
        f = Dir$(in_dir & "*.txt") tr0P ;}=  
        While f <> "" BYuF$[3ya&  
            ReDim Preserve in_flist(fCount) ]2\|<.  
            in_flist(fCount) = f VAf"B5 R  
            fCount += 1 j+AAhn  
            f = Dir$() tZmo= 3+:  
        Wend XB,  2+  
        ReDim Preserve in_flist(fCount-1) y?j#;n0  
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    End Sub ~*RG|4#  
     
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