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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 n1ly y0%u  
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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 >8WP0 Qx/  
    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。 eYN5;bx)W  
    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。 g# Sl %Y  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 A OISs4  
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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。 T 6)bD&  
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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) 9Uj $K>:  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 +av@$}  
    例如下所示: ts\5uiB<%  
    Sample name:  EDF-C1-56 6kpg+{;  
    Merging data from file EDF-C1-56 0-0.txt 1 *'HL#  
    Finished merging RPC data for sample EDF-C1-56 nExU#/*~^  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u%}nw :>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D^l%{IG   
    a. 创建一个新的散射库 g!lWu[d  
    b. 散射模型命名 Cs9.&Y  
    c. 改变散射模型为“Tabulated BSDF”. W+UfGk}A  
    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 ) i BF|&h(\  
    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。 D8Ykg >B;&  
    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 #gz M|  
    g. 点击OK n>ULRgiT:o  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 o]yl ;I  
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    脚本代码 . $BUw  
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    '#Language "WWB-COM" gp>3I!bo[K  
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    Option Explicit sH{4Y-J  
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    Sub Main &dM. d!  
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        'Cleanup c3 jx+Q  
        ClearOutputWindow() OGK}EI  
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        Print "Merging RPC Photonics BSDF Data Files" sDPs G5q<  
        SetTextColor(255,0,0) W42 iu"@  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." B"h#C!E  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." NQBpX  
        SetTextColor(0,0,0) D{GfL ib"U  
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        'Current directory of this script (should be the same as the text files being merged) B2>H_dmQ  
        Dim cDir As String 'u*D A|HC  
        cDir = MacroDir$ & "\" yv t.  
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        'Array which will be populated with the list of files to be merged B3We|oe!  
        Dim fList() As String, curFile As String } Yb[   
        GetFileList( cDir, fList ) 4Jp:x"w  
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        Print "" 4!Fo$9  
        Print "Files found for merging:" |iakz|])  
        For Each curFile In fList [xSF6  
            Print Chr(9) & curFile ) i;1*jK  
        Next u+Y\6~=+  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _Gn2o2T  
        Dim nameArray() As String, sampName As String Q-_N2W ?  
        nameArray = Split(fList(0)," 0-0.txt") ]~9t Y n  
        sampName  = nameArray(0) '))0Lh l  
        Print "" Q_"]+i]s@  
        Print "Sample name: " & Chr(9) & sampName uGwm r  
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        'Open an output file and write the FRED header data ff]6aR/ UQ  
        Dim outFile As String BF\XEm?!  
        outFile = cDir & sampName & "_FRED.txt" /s x@$cvW  
        Open outFile For Output As #1 |cK*~  
        Print #1, "type bsdf_data" mk;&yh  
        Print #1, "format angles=deg bsdf=value scale=1" |,S+@"0#  
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        'Loop the file list, skip the two header lines and write the remaining data to file ?9!6%]2D  
        Dim lineArray() As String, curLine As Long Nv#t:J9f  
        For Each curFile In fList /5S30 |K  
            Print "Merging data from file " & curFile 9]k @Q_  
            ReadFile( cDir & curFile, lineArray ) v[ . cd*b  
            For curLine = 2 To UBound(lineArray) h{%nC>m;  
                Print #1, lineArray(curLine) /KFfU1  
            Next nEJq_  
        Next }q_<_lQ  
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        'Close the output file y&6FybIz  
        Close #1 WffQ:L?  
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        Print "Finished merging RPC data for sample " & sampName !\-{D$E?H  
        Print "FRED formatted data file: " & Chr(9) & outFile `.E[}W  
    End Sub HJ9Kz^TnC  
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    'Utility function to read the contents of a file into an array of strings. Lf16j*}-Q  
    Function ReadFile(ByVal fileName As String, _ Z/W:97M  
                      ByRef lineArray() As String) As Long *1 uKr9  
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        ReadFile = -1 MV5_L3M  
        Dim oFSO As Object '.on)Zd.  
        Set oFSO = CreateObject("Scripting.FileSystemObject") U_Vs.M.p  
        Erase lineArray C_( *>!Z%  
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        Dim fid As Long }u\])I3  
        If oFSO.fileexists( fileName ) Then )Q=_0;#;k  
            fid = FreeFile() 6"wlg!k8  
            Open fileName For Input As fid rA3$3GLQ-  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) YJ^] u}  
            Close fid gR&Q3jlIV  
        End If 'H3^e}   
        Set oFSO = Nothing v| gw9  
        Return UBound( lineArray ) 0@[$lv;OS  
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    End Function eX?OYDDC0j  
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    Sub GetFileList( ByVal in_dir As String, _ qz+dmef  
                     ByRef in_flist() As String ) B\=L3eL<D  
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        'Redimension the file list array _G[g;$ <  
        Erase in_flist Dl<bnx;0  
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        'Tracks how many files are found -?H#LUk  
        Dim fCount As Long 2V"B:X\  
        fCount = 0 Q! o'}nA  
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        'Recurse directory and search for text files .~)q};Z  
        Dim f As String ],>@";9u"  
        f = Dir$(in_dir & "*.txt") 4qO+_!x{)  
        While f <> "" "~#3&3HVS  
            ReDim Preserve in_flist(fCount) Tre]"2l  
            in_flist(fCount) = f EOIN^4V"  
            fCount += 1 :WjpzgPuN  
            f = Dir$() \MsTB|Z  
        Wend +Jlay1U&  
        ReDim Preserve in_flist(fCount-1) yg `j-9[8  
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    End Sub |EIng0a  
     
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