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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 qKNX^n;  
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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 |W4 \  
    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。 0goKiPx  
    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。  O_^O1  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 U'(}emh}  
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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。 B w?Kb@  
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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) k.=67L  
    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 /^ *GoB  
    例如下所示: e[_W( v  
    Sample name:  EDF-C1-56 7.g)_W{7}  
    Merging data from file EDF-C1-56 0-0.txt 7oaa)  
    Finished merging RPC data for sample EDF-C1-56 y Nb&;E7 H  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %.^8&4$+  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 eLE9-K+  
    a. 创建一个新的散射库 tKg\qbY&  
    b. 散射模型命名 DwM4/m  
    c. 改变散射模型为“Tabulated BSDF”. L(tS]yWHw  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) NCbl|v=  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 FD>j\  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 w20E]4"  
    g. 点击OK ;m6Mm`[i<  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kB_uU !G  
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    脚本代码 obWBX'  
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    '#Language "WWB-COM" L-ans2?  
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    Option Explicit V"":_`1VW  
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    Sub Main sX53(|?*  
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        'Cleanup 7+] T}4;  
        ClearOutputWindow() N}{CL(xi  
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        Print "Merging RPC Photonics BSDF Data Files" &We1i &w  
        SetTextColor(255,0,0) Q]X0 O10  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." x" 21 Jh  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." f:iK5g  
        SetTextColor(0,0,0) -f?Rr:#  
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        'Current directory of this script (should be the same as the text files being merged) ,Yhy7w  
        Dim cDir As String bqY}t. Y&"  
        cDir = MacroDir$ & "\" INwc@XB  
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        'Array which will be populated with the list of files to be merged /Z<"6g?  
        Dim fList() As String, curFile As String JtYc'%OF  
        GetFileList( cDir, fList ) b:fy  
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        Print "" ]e+IaZ[Wo  
        Print "Files found for merging:" {#M=gDhbX  
        For Each curFile In fList #u+BjuZo  
            Print Chr(9) & curFile L^PZ\OC  
        Next  I 0ycLx  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3}O.B r|  
        Dim nameArray() As String, sampName As String rC]jz$sle  
        nameArray = Split(fList(0)," 0-0.txt") Cnf;5/  
        sampName  = nameArray(0) bu"Jb4_a>  
        Print "" 2c fzLW(  
        Print "Sample name: " & Chr(9) & sampName }i_[wq{E&  
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        'Open an output file and write the FRED header data ixN>KwH  
        Dim outFile As String Q6?+#}  
        outFile = cDir & sampName & "_FRED.txt" b!hxx Z  
        Open outFile For Output As #1 uE:#m.Q  
        Print #1, "type bsdf_data" ;@K,>$ur-  
        Print #1, "format angles=deg bsdf=value scale=1" {y0*cC  
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        'Loop the file list, skip the two header lines and write the remaining data to file EVmQ"PKL'  
        Dim lineArray() As String, curLine As Long K/oPfD]  
        For Each curFile In fList R7T"fN  
            Print "Merging data from file " & curFile %_+9y??  
            ReadFile( cDir & curFile, lineArray ) 1DcYc-k#  
            For curLine = 2 To UBound(lineArray) FM9b0qE  
                Print #1, lineArray(curLine) >>krH'79  
            Next &:L8; m  
        Next sBp|Lo  
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        'Close the output file `g% ]z@'+?  
        Close #1 H^"BK-`hs  
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        Print "Finished merging RPC data for sample " & sampName GSV,  
        Print "FRED formatted data file: " & Chr(9) & outFile eG # (9  
    End Sub Sw#Ez-X  
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    'Utility function to read the contents of a file into an array of strings. _5M!ec  
    Function ReadFile(ByVal fileName As String, _ ;3\F b3d  
                      ByRef lineArray() As String) As Long &dvJg  
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        ReadFile = -1 ` 2|~Z H  
        Dim oFSO As Object 6 6x} |7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") uW;Uq=UN  
        Erase lineArray /@FB;`'  
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        Dim fid As Long nL^6{I~  
        If oFSO.fileexists( fileName ) Then vJ GxD\h  
            fid = FreeFile() i#lvt#2J0  
            Open fileName For Input As fid PGT!HdX#{  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) SrK;b .  
            Close fid L3q)j\ ls  
        End If e^~t52]  
        Set oFSO = Nothing 9 )B>|#\  
        Return UBound( lineArray ) BO[Q"g$Kon  
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    End Function l@1f L%f  
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    Sub GetFileList( ByVal in_dir As String, _ *sJx0<!M}  
                     ByRef in_flist() As String ) pRc(>P3;  
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        'Redimension the file list array r_)-NOp  
        Erase in_flist mm#U a/~1u  
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        'Tracks how many files are found a-!"m  
        Dim fCount As Long Kox~k?JK  
        fCount = 0 i04Sf^  
    >4M_jC.  
        'Recurse directory and search for text files 2l5@gDk5  
        Dim f As String @{I55EQ]  
        f = Dir$(in_dir & "*.txt") .U5+PQN  
        While f <> "" ^0{S!fs  
            ReDim Preserve in_flist(fCount) ?2EzNNcS  
            in_flist(fCount) = f 7M;Y#=sR  
            fCount += 1 V<4)'UI?k9  
            f = Dir$() 'Iyk`=R  
        Wend  vA`[#(C  
        ReDim Preserve in_flist(fCount-1) mSQ!<1PM  
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    End Sub ;t?pyFT2Z  
     
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