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摘要: MCO`\"`l vHM,_I{ 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。 H%G|8,4 Dg'BlrwbR 背景: Xn
#v! 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。 >&D}^TMYY 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。 (Y:?qy 图1. RPC Photonics工程漫射体结构及光束投射形状 ~tB#Q6`nB hzV= 7 qi=v}bp& 步骤 o3,}X@p =)IV^6~b 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。 Cu`ty] -' R}T\<6Y 图2. RPC Photonics工程漫射体不同类型的散射数据 tr@)zM
GB 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) ,ocAB;K 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 6`V~cVu 例如下所示: 9*;OHoD h Sample name: EDF-C1-56 ihBIE Merging data from file EDF-C1-56 0-0.txt s_4y^w]aX Finished merging RPC data for sample EDF-C1-56 J|.n bSE FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ePscSMx& 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 UJ7{FN=@t a. 创建一个新的散射库 {N'<_%cu b. 散射模型命名 2f0qfF c. 改变散射模型为“Tabulated BSDF”. r O-=):2 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 ) [iUy_ C=qp 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。 PS'SI X 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, ^
RIWW0 g. 点击OK 6S&OE k 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )JXy>q# !~fy".|x {pz7ADK< 脚本代码: +~\ 1g^h k<QZ_*x}G '#Language "WWB-COM" <RJ+f- 9^1li2z k{ Option Explicit M~Ph/ "5b4fQ;x Sub Main n0%5mTUN wuKr9W9Xa 'Cleanup Rg%Xy`gS ClearOutputWindow() a,eJO ?? tJ9gwx7Pg Print "Merging RPC Photonics BSDF Data Files" -fT}Nj\ SetTextColor(255,0,0) X3R:^ff\ Print "Note: Script should be located in the same folder as the BSDF TXT files." [Y-3C47 Print "Note: Do not run this script multiple times without deleting the output file between executions." eZMfn$McJv SetTextColor(0,0,0) q$7/X;A FJ{6_=@D 'Current directory of this script (should be the same as the text files being merged) 9" cyZO Dim cDir As String Ws;X;7tS cDir = MacroDir$ & "\" }.N~jx0R wj 15Og? 'Array which will be populated with the list of files to be merged 6wH:jd9, Dim fList() As String, curFile As String t`pbEjE0K GetFileList( cDir, fList ) L|Bjw3K&D d5#z\E?? Print "" q]#j,}cN9 Print "Files found for merging:" :uB(PeAv* For Each curFile In fList K96N{"{iI% Print Chr(9) & curFile *QA{xvT Next O PJ(ub ?yKG\tPhM 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5`Y>!|
Ab Dim nameArray() As String, sampName As String L7nW_ nameArray = Split(fList(0)," 0-0.txt") pMV ?vH sampName = nameArray(0) k|3hs('y| Print "" _@! yj Print "Sample name: " & Chr(9) & sampName I|.
< Kj/Lcx;bh 'Open an output file and write the FRED header data y/;DA= Dim outFile As String V0!kvIv outFile = cDir & sampName & "_FRED.txt" oQK,#>rv Open outFile For Output As #1 |>Pz#DCy Print #1, "type bsdf_data" TTD#ovo' Print #1, "format angles=deg bsdf=value scale=1" d"OYq 'tJxADK 'Loop the file list, skip the two header lines and write the remaining data to file *r|Zbxf( Dim lineArray() As String, curLine As Long ?G 'sb}. For Each curFile In fList mNKcaM?h Print "Merging data from file " & curFile +zZ]Txb( ReadFile( cDir & curFile, lineArray ) S~U5xM^s For curLine = 2 To UBound(lineArray) O:Wd
,3_ Print #1, lineArray(curLine) 2Ws'3Jz Next rm4t Next lw_@(E]E iz3Hoj 'Close the output file : eFyd`Syw Close #1 %J+k.UrM j+[oZfH Print "Finished merging RPC data for sample " & sampName \?[ m%$A Print "FRED formatted data file: " & Chr(9) & outFile ~(]'ah, End Sub 8@r>`c [~ !9t9+~ 'Utility function to read the contents of a file into an array of strings. "rHPcp"m Function ReadFile(ByVal fileName As String, _ c3(0BSv ByRef lineArray() As String) As Long \-D[C+1( =yZ6 $ hK ReadFile = -1 {EJ+
Dim oFSO As Object lcXo> Set oFSO = CreateObject("Scripting.FileSystemObject") O)c3Lm-w Erase lineArray p~OX1RBI >N"=10 Dim fid As Long (5kL6d2 If oFSO.fileexists( fileName ) Then F]cc?r312 fid = FreeFile() r{wf;5d( Open fileName For Input As fid c=aVYQ"2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) wlpcuz@ Close fid ik5"9b-\< End If <7o@7r'0 Set oFSO = Nothing M$e$%kPShE Return UBound( lineArray ) d?><+!a mh35S!I3I^ End Function )h1 `?q:5 uTrQ<|}# Sub GetFileList( ByVal in_dir As String, _ rEoOv ByRef in_flist() As String ) p1s|JI [6)vD@ 'Redimension the file list array n<Ki.;-ZE Erase in_flist eBqF@'DQ e?WI=Og 'Tracks how many files are found y1#QP3'Z1 Dim fCount As Long R)Dh; XA fCount = 0 F6"Qs FG JqtOoR 'Recurse directory and search for text files zLg_0r*h1 Dim f As String mxICQ>s
b f = Dir$(in_dir & "*.txt") FYH^axpp While f <> "" hA+;eXy/ ReDim Preserve in_flist(fCount) AjINO}b in_flist(fCount) = f d.k'\1o fCount += 1 aZ}z/.b] f = Dir$() 1~vv<`- Wend =cxG4R1x ReDim Preserve in_flist(fCount-1) ;0}C2Cz' Ox6^=D" End Sub Z|j\_VKhl
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