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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 X'WbS  
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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 Bi)1*  
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。 qv=i eU  
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。 X5527`?e  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 PygaW&9Z|d  
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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。 X4lz?Y:*  
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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=H#  
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 J84Q|E  
例如下所示: m@R!o  
Sample name:  EDF-C1-56 ds,NNN<HW  
Merging data from file EDF-C1-56 0-0.txt c=K . |g,  
Finished merging RPC data for sample EDF-C1-56 ,8nu%zcVn  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt i<l_z&  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;"$Wfy  
a. 创建一个新的散射库 o<`Mvw@Z  
b. 散射模型命名 +] >o@  
c. 改变散射模型为“Tabulated BSDF”. D |kdk;Xv  
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 ) lM~ 3yBy  
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。 HKbyi~8N=  
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, A}v! vVg  
g. 点击OK z'Atw"kA  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 $8vZiB!"  
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脚本代码 dE~]%fUFy-  
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'#Language "WWB-COM" D^8]+2r  
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Option Explicit  L_3Ao'SA  
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Sub Main hkB/ OJ  
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    'Cleanup \!M6-kmi  
    ClearOutputWindow() Hd]o?q\  
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    Print "Merging RPC Photonics BSDF Data Files" m/@ ;N,K  
    SetTextColor(255,0,0) .}!"J`{ W  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." q{T [|(!  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." KT$Za  
    SetTextColor(0,0,0) yuIy?K  
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    'Current directory of this script (should be the same as the text files being merged) 4eH:eCZze  
    Dim cDir As String 0z&]imU  
    cDir = MacroDir$ & "\" 3,`I\>No  
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    'Array which will be populated with the list of files to be merged K!W7a~ @  
    Dim fList() As String, curFile As String s^f7w  
    GetFileList( cDir, fList ) }C-K0ba7  
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    Print "" wW &q)WOi  
    Print "Files found for merging:" : EA-L  
    For Each curFile In fList !r\u,l^  
        Print Chr(9) & curFile 9o%k [n  
    Next 0V;9v  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. nv$>iJ^~H  
    Dim nameArray() As String, sampName As String /LwS|c6}}  
    nameArray = Split(fList(0)," 0-0.txt") {A^3<=|  
    sampName  = nameArray(0) 8XfhXm>~  
    Print "" Kk.a9uKI}  
    Print "Sample name: " & Chr(9) & sampName EzII!0 F  
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    'Open an output file and write the FRED header data xB5qX7*.  
    Dim outFile As String a]H&k$!c  
    outFile = cDir & sampName & "_FRED.txt" {Kh^)oYdd  
    Open outFile For Output As #1 (KG2X  
    Print #1, "type bsdf_data" ?D>%+rK8c  
    Print #1, "format angles=deg bsdf=value scale=1" ^^ >j2=  
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    'Loop the file list, skip the two header lines and write the remaining data to file qa-%j+  
    Dim lineArray() As String, curLine As Long jk (tw-B  
    For Each curFile In fList ]{Y7mpdB  
        Print "Merging data from file " & curFile 88x2Hf5I  
        ReadFile( cDir & curFile, lineArray ) Ml,~@} p  
        For curLine = 2 To UBound(lineArray) zv .#9^/y  
            Print #1, lineArray(curLine) {Jbouj?V!  
        Next @LSfP  
    Next t,NE`LC  
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    'Close the output file SI`ems{1>c  
    Close #1 gQQve{'  
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    Print "Finished merging RPC data for sample " & sampName d9iVuw0u<  
    Print "FRED formatted data file: " & Chr(9) & outFile a``/x_EZMn  
End Sub ]ZR}Pm/CA  
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'Utility function to read the contents of a file into an array of strings. hKVb#|$  
Function ReadFile(ByVal fileName As String, _ jXPf}{^  
                  ByRef lineArray() As String) As Long @[LM8 @:  
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    ReadFile = -1 ''^2rF^  
    Dim oFSO As Object xWK0p'E0  
    Set oFSO = CreateObject("Scripting.FileSystemObject") "]T1DG"  
    Erase lineArray %OJ"@6A  
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    Dim fid As Long ~%eZQgqA*  
    If oFSO.fileexists( fileName ) Then q# 6|/R*  
        fid = FreeFile() kfY. 9$(d  
        Open fileName For Input As fid I*z|_}$  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) :]icW ^%  
        Close fid &( ZEs c  
    End If Aflf]G1  
    Set oFSO = Nothing !_q=r[D\  
    Return UBound( lineArray ) : ]JMsa6  
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End Function _BEDQb{"|  
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Sub GetFileList( ByVal in_dir As String, _ nP&6i5s%  
                 ByRef in_flist() As String ) !eHQe7_  
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    'Redimension the file list array ], IQ~  
    Erase in_flist /2Z7  
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    'Tracks how many files are found U#x`u|L&6  
    Dim fCount As Long oj=% < a  
    fCount = 0 xyP 0haE  
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    'Recurse directory and search for text files B?db`/G9  
    Dim f As String Z,-J tl  
    f = Dir$(in_dir & "*.txt") 4d_Az'7`4  
    While f <> "" .?5~zet#;  
        ReDim Preserve in_flist(fCount) tl 9`  
        in_flist(fCount) = f %+((F +[  
        fCount += 1 CHi t{ @9  
        f = Dir$()  Spw^h=o  
    Wend as73/J6  
    ReDim Preserve in_flist(fCount-1) =)#<u9 qqL  
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End Sub SBaTbY0  
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