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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 /t6X(*xoy  
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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 Q#(GI2F2#  
    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。 QZX~T|Ckv  
    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。 1xU3#b&2tC  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 P/JK$nb  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 U$H @ jJ*  
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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) oo=#XZkk  
    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 QRLJ_W^&u  
    例如下所示: x f4{r+  
    Sample name:  EDF-C1-56 kAM1TWbaVQ  
    Merging data from file EDF-C1-56 0-0.txt YUQtMf9  
    Finished merging RPC data for sample EDF-C1-56 7O`o ovW$  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt >K# ,cxY  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 htm{!Z]s0  
    a. 创建一个新的散射库 kkvtB<<Y  
    b. 散射模型命名 ri1C-TJM)  
    c. 改变散射模型为“Tabulated BSDF”. /U6% %%-D`  
    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 ) o$C| J]%  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 dr{y0`CCN  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 yAL1O94  
    g. 点击OK _MWM;f`b  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |wox1Wt|E  
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    脚本代码 Y${l!+q  
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    '#Language "WWB-COM" 0)Rw|(Fpo]  
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    Option Explicit .+y>8h3{  
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    Sub Main \Hqc 9&0  
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        'Cleanup `(0LK%w  
        ClearOutputWindow() kl1Y] ?z}  
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        Print "Merging RPC Photonics BSDF Data Files" "Lh  
        SetTextColor(255,0,0) i`)!X:j  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." qQ7w&9r.M  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." z"DkFvA  
        SetTextColor(0,0,0) )a=/8ofe  
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        'Current directory of this script (should be the same as the text files being merged) xx*2?i  
        Dim cDir As String BO.dz06(Rw  
        cDir = MacroDir$ & "\" _SZ5P>GIU  
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        'Array which will be populated with the list of files to be merged /?"8-0d  
        Dim fList() As String, curFile As String lH|LdlX  
        GetFileList( cDir, fList ) OMihXt[  
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        Print "" Fk^3a'/4KJ  
        Print "Files found for merging:" 8_uzpeRhJc  
        For Each curFile In fList  17hTr  
            Print Chr(9) & curFile ID1?PM  
        Next WW@"Z}?k  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. dMl+ko  
        Dim nameArray() As String, sampName As String tJ& 5tNl  
        nameArray = Split(fList(0)," 0-0.txt") 2 Tvvq(?T  
        sampName  = nameArray(0) *!:QdWLq  
        Print "" %-;b u|  
        Print "Sample name: " & Chr(9) & sampName tn/T6C^)  
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        'Open an output file and write the FRED header data =OTm2:j#yQ  
        Dim outFile As String }xn_6  
        outFile = cDir & sampName & "_FRED.txt" y[0`hSQ)~  
        Open outFile For Output As #1 lm'Zy"~::  
        Print #1, "type bsdf_data" ED![^=  
        Print #1, "format angles=deg bsdf=value scale=1" NWmtwS+@  
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        'Loop the file list, skip the two header lines and write the remaining data to file p4X{"Z\mn  
        Dim lineArray() As String, curLine As Long <o:@dS  
        For Each curFile In fList v.Ogf 5  
            Print "Merging data from file " & curFile  W^g[L:s  
            ReadFile( cDir & curFile, lineArray ) 4cCF \&yU  
            For curLine = 2 To UBound(lineArray) ^9"KTZc-*  
                Print #1, lineArray(curLine) ),@f6](  
            Next US?Rr  
        Next H*e'Cs/  
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        'Close the output file +1{fzb>9_  
        Close #1 (!K+P[g  
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        Print "Finished merging RPC data for sample " & sampName  v%{0 Tyk  
        Print "FRED formatted data file: " & Chr(9) & outFile Ef7:y|?  
    End Sub EU`T6M  
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    'Utility function to read the contents of a file into an array of strings. z YDK $  
    Function ReadFile(ByVal fileName As String, _ rjojG59U>  
                      ByRef lineArray() As String) As Long V+B71\x<  
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        ReadFile = -1 "-i#BjZl/  
        Dim oFSO As Object %l9$a`&  
        Set oFSO = CreateObject("Scripting.FileSystemObject") A[/I#Im7  
        Erase lineArray A|x:UQlu  
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        Dim fid As Long J=WB6zi  
        If oFSO.fileexists( fileName ) Then XQ;I,\m  
            fid = FreeFile() H/cTJ9zz  
            Open fileName For Input As fid z?.(3oLT  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) k khE}qSD  
            Close fid ;[5r7 jHU  
        End If - @bp4Z=  
        Set oFSO = Nothing RtF8A5ys  
        Return UBound( lineArray ) z:G}>fk5  
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    End Function o'UHStk  
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    Sub GetFileList( ByVal in_dir As String, _ C|e+0aW  
                     ByRef in_flist() As String ) |XcH]7Ai"  
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        'Redimension the file list array 12gw#J/)9h  
        Erase in_flist eK_*q -  
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        'Tracks how many files are found .H;B=nd*  
        Dim fCount As Long <f%/px%1  
        fCount = 0 H7e /  
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        'Recurse directory and search for text files cC6z,0`3  
        Dim f As String #EwK"S~  
        f = Dir$(in_dir & "*.txt") #8?^C]*{0  
        While f <> "" \graMu}-  
            ReDim Preserve in_flist(fCount) CIQwl 6H9  
            in_flist(fCount) = f "3y}F  
            fCount += 1 `jW 4H$D  
            f = Dir$() 6"%qv`.Fp  
        Wend P4%>k6X  
        ReDim Preserve in_flist(fCount-1) LZV}U*  
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    End Sub d.\PS9l  
     
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