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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 Y)F(-H)  
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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 EK=0oy[  
    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。 kN1R8|pv  
    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。 ,M?8s2?  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 aY? VP?BL  
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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。 I50Ly sM  
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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) BWxJ1ENM  
    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 ![ce }  
    例如下所示: _[z)%`kay  
    Sample name:  EDF-C1-56 Xwo+iZ(a  
    Merging data from file EDF-C1-56 0-0.txt )#M$ov  
    Finished merging RPC data for sample EDF-C1-56 N [3Y~HX!q  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Zl&ED{k<  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 AQ(n?1LU  
    a. 创建一个新的散射库 )@I] Rk?  
    b. 散射模型命名 ysK J=  
    c. 改变散射模型为“Tabulated BSDF”. y `FZ 0FI  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 2e1%L,y{W  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 TO5y.M|7  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 nlhv  
    g. 点击OK ]zyT_}&  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 N".BC|r  
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    脚本代码 dtY8>klI  
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    '#Language "WWB-COM" zF^H*H  
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    Option Explicit ?'a>?al%>  
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    Sub Main ;}f {o^]'  
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        'Cleanup ktynIN  
        ClearOutputWindow() iR9duP+  
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        Print "Merging RPC Photonics BSDF Data Files" k3t]lG p  
        SetTextColor(255,0,0) J`0dF<<{[y  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." [Q8Wy/o Q  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." +{=U!}3|  
        SetTextColor(0,0,0) >f Hu  
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        'Current directory of this script (should be the same as the text files being merged) [^}bc-9?i  
        Dim cDir As String Nb3O> &J  
        cDir = MacroDir$ & "\" cy!P!t,@  
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        'Array which will be populated with the list of files to be merged W0mvwYON[  
        Dim fList() As String, curFile As String e<=Nd,v4;  
        GetFileList( cDir, fList ) VByA6^JR  
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        Print "" $-pijBiz_  
        Print "Files found for merging:" vv2[t  
        For Each curFile In fList $v2t6wS,"  
            Print Chr(9) & curFile MtPdpm6\  
        Next X=f%!  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. "AXgT[ O  
        Dim nameArray() As String, sampName As String QA^FP8!j  
        nameArray = Split(fList(0)," 0-0.txt") K@2"n| S;  
        sampName  = nameArray(0) cy? #LS  
        Print "" O>vCi&  
        Print "Sample name: " & Chr(9) & sampName N.Q}.(N0  
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        'Open an output file and write the FRED header data 4noy!h  
        Dim outFile As String >h~ik/|*  
        outFile = cDir & sampName & "_FRED.txt" p>J@"?%^  
        Open outFile For Output As #1 bM?29cs  
        Print #1, "type bsdf_data" tj*0Y-F~  
        Print #1, "format angles=deg bsdf=value scale=1" N$t<&5 +  
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        'Loop the file list, skip the two header lines and write the remaining data to file ep},~tPZn  
        Dim lineArray() As String, curLine As Long <3j`Z1J  
        For Each curFile In fList tK uJ &I~  
            Print "Merging data from file " & curFile fD\Fq'29{  
            ReadFile( cDir & curFile, lineArray ) t OJyj49^a  
            For curLine = 2 To UBound(lineArray) bFL2NH5  
                Print #1, lineArray(curLine) 0Ba]Zo Z  
            Next N8kNi4$mp=  
        Next kd"nBb=  
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        'Close the output file -~JYfj@  
        Close #1 CGK]i. N  
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        Print "Finished merging RPC data for sample " & sampName J9XH8Grk-  
        Print "FRED formatted data file: " & Chr(9) & outFile j@+$lU*r  
    End Sub 3HcduJntl  
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    'Utility function to read the contents of a file into an array of strings. cl4 _M{~  
    Function ReadFile(ByVal fileName As String, _ jy>?+hm?  
                      ByRef lineArray() As String) As Long @T L|\T  
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        ReadFile = -1 =6 zK 1Z  
        Dim oFSO As Object KTot40osj  
        Set oFSO = CreateObject("Scripting.FileSystemObject") kmu`sk"  
        Erase lineArray :/$_eg0A  
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        Dim fid As Long +rSU  
        If oFSO.fileexists( fileName ) Then l. cp[  
            fid = FreeFile()  R:Ih#2R  
            Open fileName For Input As fid #l- 0$  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) YjL'GmL<  
            Close fid ,G="wI  
        End If ,g0t&jITo  
        Set oFSO = Nothing W)T'?b'.  
        Return UBound( lineArray ) /uR/,R++  
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    End Function eGpKoq7a  
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    Sub GetFileList( ByVal in_dir As String, _ )'RaMo` 4  
                     ByRef in_flist() As String ) [ "3s  
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        'Redimension the file list array 7hPwa3D^  
        Erase in_flist L$);50E  
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        'Tracks how many files are found +zLw%WD[l  
        Dim fCount As Long =)g}$r &<  
        fCount = 0 9v-Y*\!w.  
    :HY =^$\  
        'Recurse directory and search for text files $-t@=N@vO?  
        Dim f As String , #GB  
        f = Dir$(in_dir & "*.txt") o^"OKHU,S0  
        While f <> "" +Q);t,  
            ReDim Preserve in_flist(fCount) Rmn{Vui9\  
            in_flist(fCount) = f H7Z`aQC  
            fCount += 1  qbS6#7D  
            f = Dir$() {=Jo!t;f  
        Wend HRM-r~2:-]  
        ReDim Preserve in_flist(fCount-1) C$C>RYE?.  
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    End Sub :wg=H  
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