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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

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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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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。 gMay  
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。 1.dX)^\  
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,HS;wo;t  
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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。 ?o>6S EGW  
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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) FvA|1c  
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 o@',YF>OQ  
例如下所示: 1:5P%$?b  
Sample name:  EDF-C1-56 Di])<V  
Merging data from file EDF-C1-56 0-0.txt )u Qvt-  
Finished merging RPC data for sample EDF-C1-56 Q'C 4pn@  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !p"Kd ~  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ZmP1C`>  
a. 创建一个新的散射库 x{j+}'9  
b. 散射模型命名 Crg#6k1~EN  
c. 改变散射模型为“Tabulated BSDF”. R05T5Q1]A  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) PbQE{&D#  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 *V<)p%l.  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, GJ>ypEWo  
g. 点击OK !,R  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 9<w=),R`8  
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脚本代码 9QZ}Hn`p  
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'#Language "WWB-COM" hsz$S:am  
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Option Explicit |&(H^<+Xp  
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Sub Main [e1\A&T  
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    'Cleanup 6\XP|n-0+0  
    ClearOutputWindow() 37~rm  
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    Print "Merging RPC Photonics BSDF Data Files" ^`/V i  
    SetTextColor(255,0,0) ud.poh~|  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." G1A$PR  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." P mC82"  
    SetTextColor(0,0,0) \2(MpB\_6!  
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    'Current directory of this script (should be the same as the text files being merged) #%qqL  
    Dim cDir As String rx{#+ iw  
    cDir = MacroDir$ & "\" 1RmBtx\<  
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    'Array which will be populated with the list of files to be merged +7`u9j.  
    Dim fList() As String, curFile As String s!bHS_\e|  
    GetFileList( cDir, fList ) y B1W>s8&  
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    Print "" J&(  
    Print "Files found for merging:" 7jhl0  
    For Each curFile In fList #3YdjU3w  
        Print Chr(9) & curFile zj%cd;  
    Next G &m>Ov$#&  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. p0"BO4({{  
    Dim nameArray() As String, sampName As String -v;iMEZ)  
    nameArray = Split(fList(0)," 0-0.txt") -=@K %\\~5  
    sampName  = nameArray(0) * .oi3m  
    Print "" _CHKh*KHML  
    Print "Sample name: " & Chr(9) & sampName r#ks>s  
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    'Open an output file and write the FRED header data *4zoAslU1  
    Dim outFile As String rD_Ss.\^g  
    outFile = cDir & sampName & "_FRED.txt" o,iS&U"TC  
    Open outFile For Output As #1 )tJL@Qo  
    Print #1, "type bsdf_data" fN~8L}!l  
    Print #1, "format angles=deg bsdf=value scale=1" 44z=m MR<  
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    'Loop the file list, skip the two header lines and write the remaining data to file n\~"Wim<b  
    Dim lineArray() As String, curLine As Long Lx9hq7<  
    For Each curFile In fList f:)]FHPB1  
        Print "Merging data from file " & curFile ZKVp[A  
        ReadFile( cDir & curFile, lineArray ) "-G.V#zI  
        For curLine = 2 To UBound(lineArray) ch%Q'DR_I)  
            Print #1, lineArray(curLine) <!$j9)~x  
        Next \mqhugy  
    Next !.x=r  
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    'Close the output file 0tn7Rkiw  
    Close #1 7N&3FER  
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    Print "Finished merging RPC data for sample " & sampName I$rW[l2  
    Print "FRED formatted data file: " & Chr(9) & outFile W+fkWq7`Xx  
End Sub H J2O@e  
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'Utility function to read the contents of a file into an array of strings. U`},)$  
Function ReadFile(ByVal fileName As String, _ C`=`Ce~|d  
                  ByRef lineArray() As String) As Long 1aXIhk4  
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    ReadFile = -1 pZNlcB[Qn-  
    Dim oFSO As Object lk5_s@V l  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 0~LnnD N  
    Erase lineArray ^/4 {\3  
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    Dim fid As Long ulJ+:zwq$  
    If oFSO.fileexists( fileName ) Then @pyA;>U  
        fid = FreeFile() Pj^k pjV  
        Open fileName For Input As fid Y+S~b  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) >-o?S O(M,  
        Close fid ~XN]?5GQf  
    End If :{e`$kz  
    Set oFSO = Nothing |2+c DR  
    Return UBound( lineArray ) ^+YGSg7  
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End Function U/~Zk@3j  
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Sub GetFileList( ByVal in_dir As String, _ {ILQ CvP*  
                 ByRef in_flist() As String ) Q'vIeG"o  
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    'Redimension the file list array pD)/- Dgdm  
    Erase in_flist 60SenHKles  
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    'Tracks how many files are found )Q N=>J  
    Dim fCount As Long xfZ9&g  
    fCount = 0 \p_8YC  
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    'Recurse directory and search for text files QyBK*uNdV  
    Dim f As String ?7uStqa  
    f = Dir$(in_dir & "*.txt") 3vEjf  
    While f <> "" 0bRkC,N (  
        ReDim Preserve in_flist(fCount) <CdG[Ih  
        in_flist(fCount) = f FkkZyCqZ`  
        fCount += 1 KfN`ZZ<  
        f = Dir$() {yl/T:Bh&  
    Wend :D)&>{?  
    ReDim Preserve in_flist(fCount-1) pu m9x)y1  
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End Sub *~MiL9m+?  
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