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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 =+gp~RR,  
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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 pj,.RcH@o  
    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。 +P6#7.p`Z  
    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。 f}bUuQrH-!  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zY8"\ZB  
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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。 S=lA^#'UdX  
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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) HSx~Fs^J  
    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 @M4~,O6-  
    例如下所示: ;?;D(%L  
    Sample name:  EDF-C1-56 uMF\3T(x4  
    Merging data from file EDF-C1-56 0-0.txt ~%^af"_  
    Finished merging RPC data for sample EDF-C1-56 _u}v(!PI  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt @.kv",[{[  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pooi8" G  
    a. 创建一个新的散射库 tBG :ECUL  
    b. 散射模型命名 fRT:@lV  
    c. 改变散射模型为“Tabulated BSDF”. h`%K \C  
    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 ) L&ws[8-  
    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。 \{da|n -  
    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 f7X#cs)a  
    g. 点击OK BmrP]3W?  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0[D5]mcv  
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    脚本代码 lGPC)Hu{`  
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    '#Language "WWB-COM" #`a-b<uz  
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    Option Explicit *wp'`3y}  
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    Sub Main [ H>MeeR  
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        'Cleanup ao{>.b  
        ClearOutputWindow() |k&.1NkZ  
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        Print "Merging RPC Photonics BSDF Data Files" TFxb\  
        SetTextColor(255,0,0) NOx&`OU+  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." G !1- 20  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." &t%CuU]/@  
        SetTextColor(0,0,0) SX^fh.  
    ;~]&$2sk  
        'Current directory of this script (should be the same as the text files being merged) K?[pCF2C  
        Dim cDir As String NG'VlT  
        cDir = MacroDir$ & "\" |@nvg>mu  
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        'Array which will be populated with the list of files to be merged Q77qrx3  
        Dim fList() As String, curFile As String kTi QO2H  
        GetFileList( cDir, fList ) }C*o;'o5G  
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        Print "" 42 p6l   
        Print "Files found for merging:" (dMFYL>YP  
        For Each curFile In fList 0*3 <}  
            Print Chr(9) & curFile --.j&w  
        Next 3jS=  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. C2<y(GU[Bh  
        Dim nameArray() As String, sampName As String f=K1ZD  
        nameArray = Split(fList(0)," 0-0.txt") +crAkb}i  
        sampName  = nameArray(0) IJ4"X#Q/  
        Print "" MCh8Q|Yx4  
        Print "Sample name: " & Chr(9) & sampName a+{g~/z;,Q  
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        'Open an output file and write the FRED header data =AD/5E,3  
        Dim outFile As String )sV# b  
        outFile = cDir & sampName & "_FRED.txt" T@yH. 4D  
        Open outFile For Output As #1 (la<X <w  
        Print #1, "type bsdf_data" \=N tbBL$[  
        Print #1, "format angles=deg bsdf=value scale=1" ~Y'e1w$`  
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        'Loop the file list, skip the two header lines and write the remaining data to file K,IOD t  
        Dim lineArray() As String, curLine As Long /#:RYM'Tu  
        For Each curFile In fList 6km u'vw  
            Print "Merging data from file " & curFile pK'WJ 72U  
            ReadFile( cDir & curFile, lineArray ) 3~cOQ%#]4  
            For curLine = 2 To UBound(lineArray) %+I(S`}  
                Print #1, lineArray(curLine) w:Lu  
            Next E<\\'VF  
        Next ,O[vxN1X*  
    HO@T2t[  
        'Close the output file |ni cvg@  
        Close #1 LV]\{'  
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        Print "Finished merging RPC data for sample " & sampName l4/TJ%`MG  
        Print "FRED formatted data file: " & Chr(9) & outFile }MIH{CMH  
    End Sub !r LHPg  
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    'Utility function to read the contents of a file into an array of strings. c%Gz{':+  
    Function ReadFile(ByVal fileName As String, _ PzV(e)~7  
                      ByRef lineArray() As String) As Long }TF<C !]  
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        ReadFile = -1 <rC#1wR4  
        Dim oFSO As Object jSG jv>  
        Set oFSO = CreateObject("Scripting.FileSystemObject") he+[  
        Erase lineArray i*^K)SI8  
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        Dim fid As Long =d5!O~}r>  
        If oFSO.fileexists( fileName ) Then :jUuw:\  
            fid = FreeFile() `+f\Q2]Z  
            Open fileName For Input As fid ?s?uoZ /2  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) eAuJ}U[  
            Close fid DY07?x7  
        End If )_Oc=/c|f  
        Set oFSO = Nothing /y!Vs`PZ!  
        Return UBound( lineArray ) 7q^/.:wlf  
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    End Function yBe/UFp+  
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    Sub GetFileList( ByVal in_dir As String, _ O#EBR<CuK  
                     ByRef in_flist() As String ) \6'A^cE/PX  
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        'Redimension the file list array RdDcMZ  
        Erase in_flist ZbrE m  
    = ]@xXVf/  
        'Tracks how many files are found ua[\npz5  
        Dim fCount As Long !<LS4s;  
        fCount = 0 qnS7z%H8  
    ;VuB8cnL`  
        'Recurse directory and search for text files 1(?J>{-lw  
        Dim f As String kp6x6%{K\  
        f = Dir$(in_dir & "*.txt") 5&kR1Bp#-  
        While f <> ""  qN QsU  
            ReDim Preserve in_flist(fCount) QVH_B+ Q  
            in_flist(fCount) = f -J30g\  
            fCount += 1 y?JbJ  
            f = Dir$() JdRs=#X  
        Wend h0eo:Ahi  
        ReDim Preserve in_flist(fCount-1) ]Bsq?e^  
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    End Sub ;MMFF{  
     
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