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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 4 6JP1  
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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 #z5?Y2t7~^  
    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。 Olrw>YbW  
    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。 jtCob'n8  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 B ~bU7.Cd  
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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。 i; uM!d}  
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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) )u:8Pv  
    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 m/c~2?-;  
    例如下所示: _C\ d^a (  
    Sample name:  EDF-C1-56 SQCuY<mD  
    Merging data from file EDF-C1-56 0-0.txt Hd}t=6  
    Finished merging RPC data for sample EDF-C1-56 g5]DA.&(  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u9%:2$[  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PltPIu)F  
    a. 创建一个新的散射库 [_GR'x'0x  
    b. 散射模型命名 6iS+3+  
    c. 改变散射模型为“Tabulated BSDF”. x?$Y<=vT  
    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 ) g4932_tC  
    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。 rV{e[fGd  
    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 ZACn_gd[5  
    g. 点击OK z>q_]U0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Tdp$laPO'  
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    脚本代码 F.w#AV  
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    '#Language "WWB-COM" }6(:OB?  
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    Option Explicit eS+LFS7*k  
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    Sub Main l0,O4k2'  
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        'Cleanup jP]'gQ!-w  
        ClearOutputWindow() uSbg*OA  
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        Print "Merging RPC Photonics BSDF Data Files" B)iJH  
        SetTextColor(255,0,0) jV8><5C  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." kE|#mI[>  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ^u<+tV   
        SetTextColor(0,0,0) O`| ri5d  
    Ku# _   
        'Current directory of this script (should be the same as the text files being merged) "d\8OOU  
        Dim cDir As String IT"jtV  
        cDir = MacroDir$ & "\" [\p0eUog/  
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        'Array which will be populated with the list of files to be merged EORAx  
        Dim fList() As String, curFile As String y->iv%  
        GetFileList( cDir, fList ) 7u(i4O& k  
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        Print "" z AIC5fvu  
        Print "Files found for merging:" G 0 yt%qHE  
        For Each curFile In fList sa ?;D  
            Print Chr(9) & curFile djp(s$:{4  
        Next u?i1n=Ne  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. W_EN4p~J  
        Dim nameArray() As String, sampName As String XDQ1gg`  
        nameArray = Split(fList(0)," 0-0.txt") 2;tp>,G9d  
        sampName  = nameArray(0) 2:yv:7t/  
        Print "" :'=C/AL  
        Print "Sample name: " & Chr(9) & sampName F'!}$oT"  
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        'Open an output file and write the FRED header data x(~l[hT  
        Dim outFile As String Ws@s(5r  
        outFile = cDir & sampName & "_FRED.txt" TjdYCk]'  
        Open outFile For Output As #1 Gz:a1-x  
        Print #1, "type bsdf_data" j|9 2 g  
        Print #1, "format angles=deg bsdf=value scale=1" $+j )  
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        'Loop the file list, skip the two header lines and write the remaining data to file vC1 `m  
        Dim lineArray() As String, curLine As Long <Th.}=  
        For Each curFile In fList j3U8@tuG  
            Print "Merging data from file " & curFile |V5H(2/nk  
            ReadFile( cDir & curFile, lineArray ) 4a~_hkY]  
            For curLine = 2 To UBound(lineArray) rjzRH  
                Print #1, lineArray(curLine) M9nYt~vHX  
            Next 'u~use"  
        Next }^t?v*kcA  
    ^q$sCt}  
        'Close the output file Wj0([n  
        Close #1 UWp(3FQ  
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        Print "Finished merging RPC data for sample " & sampName ~yV0SpL  
        Print "FRED formatted data file: " & Chr(9) & outFile j~0hAKHG  
    End Sub (nm&\b~j  
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    'Utility function to read the contents of a file into an array of strings. GzX@Av$  
    Function ReadFile(ByVal fileName As String, _ ~?FKww|_*J  
                      ByRef lineArray() As String) As Long 4T" P #)z  
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        ReadFile = -1 $= gv  
        Dim oFSO As Object {^F_b% a4z  
        Set oFSO = CreateObject("Scripting.FileSystemObject") uWSG+  
        Erase lineArray ,h"M{W$  
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        Dim fid As Long B(hNBq7  
        If oFSO.fileexists( fileName ) Then *hba>LZ  
            fid = FreeFile() ygHNAQG~  
            Open fileName For Input As fid e5dwq  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) a"EXR-+8  
            Close fid }0 Z3Lrv  
        End If n:{yri+  
        Set oFSO = Nothing xM(  
        Return UBound( lineArray ) wp$=lU{B  
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    End Function y9 "!ys  
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    Sub GetFileList( ByVal in_dir As String, _ };|'8'5  
                     ByRef in_flist() As String ) sy~mcH:%+  
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        'Redimension the file list array <5 okwcJ^  
        Erase in_flist Mw< 1  
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        'Tracks how many files are found -1[ri8t;nV  
        Dim fCount As Long .d;/6HD[y  
        fCount = 0 `eA0Z:`g!  
    T ^uBMDYe  
        'Recurse directory and search for text files 3=z'Ih`  
        Dim f As String vg<_U&N=-r  
        f = Dir$(in_dir & "*.txt") <=p"c k@  
        While f <> "" y<Z8+/f`f  
            ReDim Preserve in_flist(fCount) ,ua]h8  
            in_flist(fCount) = f K-K+%U  
            fCount += 1 -k'=s{iy  
            f = Dir$() :E.mU{  
        Wend `*! .B  
        ReDim Preserve in_flist(fCount-1) e_Y>[/Om  
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    End Sub MYu-[Hg  
     
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