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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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背景 e1RtoNF^  
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。 $v6dB {%Qu  
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。 GBZx@B[TY  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 hsQrHs'k  
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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。 B94mh  
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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)  F%6`D  
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 swVq%]')"  
例如下所示: N+?kFob  
Sample name:  EDF-C1-56 iD|"}}01  
Merging data from file EDF-C1-56 0-0.txt 'H`_Z e<  
Finished merging RPC data for sample EDF-C1-56 8<t?o'9I  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt k:w\4Oqd  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 LTY@}o]\U  
a. 创建一个新的散射库 Nky%v+r  
b. 散射模型命名 +mP3 y~|-j  
c. 改变散射模型为“Tabulated BSDF”. 5U[;T]{)e  
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 ) 5CkM0G`  
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。 H3.WAg[`  
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, U"xI1fg%b  
g. 点击OK @Ey(0BxNu  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 'PlKCn`(w  
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脚本代码 w<awCp  
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'#Language "WWB-COM" I/GZ  
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Option Explicit sf?D4UdIH  
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Sub Main 0=s+bo1  
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    'Cleanup ]P ->xJ  
    ClearOutputWindow() QH4nb h4  
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    Print "Merging RPC Photonics BSDF Data Files" EG0NikT?  
    SetTextColor(255,0,0) ;X\>oV3#  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." }_M .-Xm  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ;P _`4w3  
    SetTextColor(0,0,0) q01zN:|-1  
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    'Current directory of this script (should be the same as the text files being merged) ~]A';xH&  
    Dim cDir As String 7BF't!-2F  
    cDir = MacroDir$ & "\" ;'pEzz?k"  
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    'Array which will be populated with the list of files to be merged P7 E}^y`e  
    Dim fList() As String, curFile As String RN3w{^Ll  
    GetFileList( cDir, fList ) |zvxKIW;wd  
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    Print "" T_,LK7D  
    Print "Files found for merging:" ~/\;7E{8!  
    For Each curFile In fList m{x!uq  
        Print Chr(9) & curFile @^;WC+\0  
    Next '8k\a{t_z  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {TdK S  
    Dim nameArray() As String, sampName As String `/]8C &u  
    nameArray = Split(fList(0)," 0-0.txt") ,US~p_M!  
    sampName  = nameArray(0) R8\y|p#c  
    Print "" 0'|#Hi7@  
    Print "Sample name: " & Chr(9) & sampName PKfxL}:"8  
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    'Open an output file and write the FRED header data & HphE2 h  
    Dim outFile As String +B_q? 6pR  
    outFile = cDir & sampName & "_FRED.txt" *u7C){)gr[  
    Open outFile For Output As #1 N(}7M~m>  
    Print #1, "type bsdf_data" nUhD41GJ  
    Print #1, "format angles=deg bsdf=value scale=1" jL%-G  
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    'Loop the file list, skip the two header lines and write the remaining data to file Y#{KGVT<  
    Dim lineArray() As String, curLine As Long VrO$SmH  
    For Each curFile In fList Nf0b?jn-  
        Print "Merging data from file " & curFile VuJth  
        ReadFile( cDir & curFile, lineArray ) 68)z`JI|<)  
        For curLine = 2 To UBound(lineArray) / vje='[!  
            Print #1, lineArray(curLine) xHykU;p@  
        Next XT~JP  
    Next ,$vc*}yI0  
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    'Close the output file D}cq_|mmn[  
    Close #1 <s+=v!  
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    Print "Finished merging RPC data for sample " & sampName ^67P(h  
    Print "FRED formatted data file: " & Chr(9) & outFile ]v94U b   
End Sub IDE@{Dy  
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'Utility function to read the contents of a file into an array of strings. DWk'6;e4j  
Function ReadFile(ByVal fileName As String, _ [JMz~~ F  
                  ByRef lineArray() As String) As Long pwd7I  
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    ReadFile = -1 1.yw\ZC\  
    Dim oFSO As Object 8DLR  
    Set oFSO = CreateObject("Scripting.FileSystemObject") XV%L6x  
    Erase lineArray I g-VSQ  
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    Dim fid As Long 3 {on$\  
    If oFSO.fileexists( fileName ) Then .b  N0!  
        fid = FreeFile() 1xM&"p:  
        Open fileName For Input As fid $L:g7?)k  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) wc~a}0uz  
        Close fid RS<c&{?  
    End If xE;fM\7pu  
    Set oFSO = Nothing ]4uIb+(S  
    Return UBound( lineArray ) fRaVY`|wK  
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End Function tPC8/ntP8  
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Sub GetFileList( ByVal in_dir As String, _ b0LQ$XM>8  
                 ByRef in_flist() As String ) ;?zb (2  
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    'Redimension the file list array |;rjr_I  
    Erase in_flist _jU6[y|XLh  
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    'Tracks how many files are found GsqrKrbJ  
    Dim fCount As Long Sr2c'T"  
    fCount = 0 ,W*<e-  
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    'Recurse directory and search for text files ?$-OdABXHK  
    Dim f As String _Mq@58q'  
    f = Dir$(in_dir & "*.txt") K.l?R#G`,F  
    While f <> "" lOd[8|/  
        ReDim Preserve in_flist(fCount) 6<]&T lS]  
        in_flist(fCount) = f .t"s>jq 1  
        fCount += 1 us`hR!_  
        f = Dir$() v{?9PRf\s  
    Wend quGb;)3  
    ReDim Preserve in_flist(fCount-1) l4R:_Z<  
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End Sub rU.ew~  
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