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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 B__e*d:)!m  
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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 x?od_M;*8;  
    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。 ~:|V,1  
    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。 $iA:3DM07  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 NLUO{'uUW  
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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。 |`fuu2W!  
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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) y(E<MRd8V  
    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 n</Rd=  
    例如下所示: ,f<J4U:Y  
    Sample name:  EDF-C1-56 {<#b@=G  
    Merging data from file EDF-C1-56 0-0.txt +8"P*z,  
    Finished merging RPC data for sample EDF-C1-56 uD[T l  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <AP.m4N) _  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2^nws  
    a. 创建一个新的散射库 KuL+~  
    b. 散射模型命名 L>0Pur)[  
    c. 改变散射模型为“Tabulated BSDF”. 7) a f  
    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 ) zZey  
    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。 W1ndb:  
    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 H^vA}F`  
    g. 点击OK bQ&%6'ck  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 %c%`< y<~L  
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    脚本代码 $@L2zl1  
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    '#Language "WWB-COM" 0O-"tP8o  
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    Option Explicit Vl>KeZ+  
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    Sub Main fr$6&HDZ9  
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        'Cleanup CC3M7|eO3  
        ClearOutputWindow() Z`zLrXPD)  
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        Print "Merging RPC Photonics BSDF Data Files" <(yAat$H  
        SetTextColor(255,0,0) x"cB8bZ!$  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 3-kL0Q["  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 2^w{Hcf  
        SetTextColor(0,0,0) mgM"u94-]  
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        'Current directory of this script (should be the same as the text files being merged) c~OvoTF,  
        Dim cDir As String e"*ho[  
        cDir = MacroDir$ & "\" j |o&T41  
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        'Array which will be populated with the list of files to be merged " SP6o  
        Dim fList() As String, curFile As String b)E<b{'W  
        GetFileList( cDir, fList ) <aI}+  
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        Print "" Ww#!-,*]o  
        Print "Files found for merging:" B7'yc`)H  
        For Each curFile In fList  obPG]*3  
            Print Chr(9) & curFile (hIo0 .  
        Next 6BM$u v4  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?,%PemN  
        Dim nameArray() As String, sampName As String F~bDg tN3  
        nameArray = Split(fList(0)," 0-0.txt") 4Tx.|   
        sampName  = nameArray(0) 'fk6]&-I  
        Print "" '#.D`9YI<  
        Print "Sample name: " & Chr(9) & sampName n[# **s  
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        'Open an output file and write the FRED header data h^''ue"  
        Dim outFile As String I:YgKs)[  
        outFile = cDir & sampName & "_FRED.txt" F2EX7Crj  
        Open outFile For Output As #1 B ?y[ %i  
        Print #1, "type bsdf_data" _{eA8J(A<  
        Print #1, "format angles=deg bsdf=value scale=1" vL^ +X`.td  
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        'Loop the file list, skip the two header lines and write the remaining data to file 3"k n5)x  
        Dim lineArray() As String, curLine As Long {LCKt/Z>P  
        For Each curFile In fList DZEq(>mn  
            Print "Merging data from file " & curFile kc}|L9  
            ReadFile( cDir & curFile, lineArray )  x\VP X  
            For curLine = 2 To UBound(lineArray) hJz]N$@W  
                Print #1, lineArray(curLine) 2$A"{2G  
            Next rq}xuSFI  
        Next wwJs_f\  
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        'Close the output file vz1I/IdTd  
        Close #1 <E^;RG  
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        Print "Finished merging RPC data for sample " & sampName #uICH t3  
        Print "FRED formatted data file: " & Chr(9) & outFile 5j9%W18  
    End Sub d3#e7rQ8  
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    'Utility function to read the contents of a file into an array of strings. ziM@@$ .F  
    Function ReadFile(ByVal fileName As String, _ )V*`(dn'zm  
                      ByRef lineArray() As String) As Long Uty0mc(  
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        ReadFile = -1 JLjs`oq h  
        Dim oFSO As Object A:pD:}fm}D  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ez5>V7Y  
        Erase lineArray 2k&Voa  
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        Dim fid As Long -pQ?ybQ  
        If oFSO.fileexists( fileName ) Then pEX Q  
            fid = FreeFile() P4|A\|t  
            Open fileName For Input As fid e#F3KLSL`  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) _g,_G  
            Close fid '- #QK'p  
        End If 2:e7'}\D.  
        Set oFSO = Nothing EV-# E  
        Return UBound( lineArray ) 'SrDc'?  
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    End Function S1C#5=  
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    Sub GetFileList( ByVal in_dir As String, _ 2d  YU  
                     ByRef in_flist() As String ) z92Xc  
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        'Redimension the file list array ,wv>G]v  
        Erase in_flist Ra:UnA  
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        'Tracks how many files are found }ov>b2H#<  
        Dim fCount As Long B7o US}M  
        fCount = 0 h%v qt~0  
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        'Recurse directory and search for text files ?wn <F}UH  
        Dim f As String lZ <D,&  
        f = Dir$(in_dir & "*.txt") %dhrXK5  
        While f <> "" ;M\Cw.%![  
            ReDim Preserve in_flist(fCount) -@B6$XWL  
            in_flist(fCount) = f :&2% x  
            fCount += 1 0 wDhX  
            f = Dir$() iQLP~Z>,T  
        Wend ;4Xx5*E  
        ReDim Preserve in_flist(fCount-1) ,_=LV  
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    End Sub 7_rDNK@e  
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