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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 xR_]^Get  
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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 XX6&% 7(  
    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。 6,@M0CX  
    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。 hJ}G5pX  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Ix(4<s  
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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。 9&d BL0  
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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) yBl<E$=  
    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 y.O? c &!  
    例如下所示: \]9;c6(  
    Sample name:  EDF-C1-56 92SB'T>  
    Merging data from file EDF-C1-56 0-0.txt VqbiZOZ@  
    Finished merging RPC data for sample EDF-C1-56 Etl7V  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt s]I],>}RU  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PN'8"8`{  
    a. 创建一个新的散射库 }2\"(_  
    b. 散射模型命名 #-@{rgH  
    c. 改变散射模型为“Tabulated BSDF”. -"cN9RF  
    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 ) [ =9R5.)c  
    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。 $< aBawLZO  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 QqwX Fk  
    g. 点击OK `Ch6"= t  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 {[s<\<~B*  
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    脚本代码 {$EXI]f  
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    '#Language "WWB-COM" ;T_9;RU<'b  
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    Option Explicit y&CUT:M6  
    %/^d]#  
    Sub Main -0]aOT--  
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        'Cleanup 6 %=BYDF  
        ClearOutputWindow() AzV5Re8M  
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        Print "Merging RPC Photonics BSDF Data Files" 7d<v\=J}  
        SetTextColor(255,0,0) cpy"1=K~M  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." kDz.{Ih  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." W+eN%w5  
        SetTextColor(0,0,0) ]SPB c  
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        'Current directory of this script (should be the same as the text files being merged) C=]3NB>Jc  
        Dim cDir As String e56#Qb@$\  
        cDir = MacroDir$ & "\" jG2w(h/"  
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        'Array which will be populated with the list of files to be merged ]lo1Kw  
        Dim fList() As String, curFile As String 4w?7AI]Ej  
        GetFileList( cDir, fList ) w\mF2h  
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        Print "" g\l;>  
        Print "Files found for merging:" xL BG}C  
        For Each curFile In fList %b?Pasf.  
            Print Chr(9) & curFile }ot _k-  
        Next $W?XxgkB?  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (LfVa`<1  
        Dim nameArray() As String, sampName As String ep?0@5D}]  
        nameArray = Split(fList(0)," 0-0.txt") m7"f6zSo(  
        sampName  = nameArray(0) } -vBRY  
        Print "" gfYB|VyWo  
        Print "Sample name: " & Chr(9) & sampName Wk|z\OR(  
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        'Open an output file and write the FRED header data /Ow?nWSt  
        Dim outFile As String z(WpOD   
        outFile = cDir & sampName & "_FRED.txt" wgyO%  
        Open outFile For Output As #1 bxN;"{>Xz  
        Print #1, "type bsdf_data" c|R/,/  
        Print #1, "format angles=deg bsdf=value scale=1" 9PJDT]  
    -1:Z^&e/  
        'Loop the file list, skip the two header lines and write the remaining data to file SSXS  
        Dim lineArray() As String, curLine As Long [z~Nw#  
        For Each curFile In fList nADd,|xD3  
            Print "Merging data from file " & curFile k~R[5W|'  
            ReadFile( cDir & curFile, lineArray )  eqR#`  
            For curLine = 2 To UBound(lineArray) R u5&xIQ  
                Print #1, lineArray(curLine) =#tQIhX`  
            Next gp HwiFc  
        Next #H`y1zm  
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        'Close the output file [Mz;:/  
        Close #1 s]c$]&IGG  
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        Print "Finished merging RPC data for sample " & sampName }#8uXA  
        Print "FRED formatted data file: " & Chr(9) & outFile #+ '@/5{n  
    End Sub J7GsNFL  
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    'Utility function to read the contents of a file into an array of strings. 0f^.zt{T  
    Function ReadFile(ByVal fileName As String, _ )0mDN.  
                      ByRef lineArray() As String) As Long !P$xh  
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        ReadFile = -1 L_mqC(vn  
        Dim oFSO As Object 2-0cB$W+  
        Set oFSO = CreateObject("Scripting.FileSystemObject") }NCvaO  
        Erase lineArray ?vFh)U  
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        Dim fid As Long BA-nxR  
        If oFSO.fileexists( fileName ) Then ef&@aB  
            fid = FreeFile() j\f$r,4  
            Open fileName For Input As fid N| Pm|w*?  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q ~JKKq  
            Close fid 1`lFF_stkP  
        End If ]Rh( =bg  
        Set oFSO = Nothing t5X lR]` w  
        Return UBound( lineArray ) }G+A_HF ^  
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    End Function lM^!^6=v0l  
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    Sub GetFileList( ByVal in_dir As String, _ b U]N^og^  
                     ByRef in_flist() As String ) [IFRwQ^%_O  
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        'Redimension the file list array oxQID  
        Erase in_flist WG !t!1p  
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        'Tracks how many files are found ;&6PL]/d  
        Dim fCount As Long _F@p53WE  
        fCount = 0 !9xANSb  
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        'Recurse directory and search for text files Gr$*t,ZW  
        Dim f As String O6,"#BX  
        f = Dir$(in_dir & "*.txt") n/oipiYx  
        While f <> "" =veOVv[Q&/  
            ReDim Preserve in_flist(fCount) 9C}aX}`  
            in_flist(fCount) = f :$i:8lz  
            fCount += 1 v7FRTrqjj  
            f = Dir$() gkML .u  
        Wend H r^15  
        ReDim Preserve in_flist(fCount-1) XYHCggy  
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    End Sub @gSFvb bc  
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