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摘要: >/7[HhBT &NK6U 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。 lQ| i
Ws 5mg] su 背景: E[tEW0ub 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。 %J:2y 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。 >qci$ 图1. RPC Photonics工程漫射体结构及光束投射形状 GL3olKnL nACKSsWqI A~#w gLGn 步骤 e`;U9Z e!
0Y`lQ 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。 #RP7?yGM, !\|L(Paf 图2. RPC Photonics工程漫射体不同类型的散射数据 xB,(!0{` 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) 7r$'2">K( 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 jT:kk 例如下所示: v Yw$m#@ Sample name: EDF-C1-56 .h\[7r Merging data from file EDF-C1-56 0-0.txt $GX9-^og=T Finished merging RPC data for sample EDF-C1-56 V,>uM
>$ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;(;{~1~ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |oTA$bln a. 创建一个新的散射库 !f*t9 I9Q b. 散射模型命名 *!L
it:H c. 改变散射模型为“Tabulated BSDF”. k>!A~gfP~ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) T<~?7-O" e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 a'YK1QX f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, xkmqf7w g. 点击OK 8% `Jf` 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 <jtu/U]78| ~19&s~ @1+({u#B 脚本代码: .{66q#. 1n EW'F '#Language "WWB-COM" 5hE mXZ% DeGcS1_? Option Explicit ^26}8vt (-esUOB. Sub Main qb>mUS wQ~F%rQ$ 'Cleanup F@jyTIS^ ClearOutputWindow() HbQ+:B] 1|3{.Ed Print "Merging RPC Photonics BSDF Data Files" m7NrS?7 SetTextColor(255,0,0) [qQ~\] Print "Note: Script should be located in the same folder as the BSDF TXT files." "D.`:9sk0 Print "Note: Do not run this script multiple times without deleting the output file between executions." IjnO2X SetTextColor(0,0,0) !&@!:=X, mNnt9F3Eq 'Current directory of this script (should be the same as the text files being merged) GB`
G(a Dim cDir As String nZ~J&QK- cDir = MacroDir$ & "\" -aF\
u[b E:S (v 'Array which will be populated with the list of files to be merged ky|Py Dim fList() As String, curFile As String ff.;6R\ GetFileList( cDir, fList ) Yp8GW1@ J?84WS Print "" 0Nq6>^
% Print "Files found for merging:" Q*l_QnfG For Each curFile In fList ,[|4{qli\ Print Chr(9) & curFile EmubpUS; Next 7~7_T#dTh zIh`Vw ,t0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. <jHo2U8/"s Dim nameArray() As String, sampName As String 6qkMB|@Ix nameArray = Split(fList(0)," 0-0.txt") H?W8_XiN sampName = nameArray(0) !i*bb~ Print "" qo62!q Print "Sample name: " & Chr(9) & sampName <R@w0b> kSH|+K\M4 'Open an output file and write the FRED header data P q)C(Z Dim outFile As String 0ntf%#2{ outFile = cDir & sampName & "_FRED.txt" dsD!)$ Open outFile For Output As #1 oJbMUEQQq Print #1, "type bsdf_data" ,]qTJ`J Print #1, "format angles=deg bsdf=value scale=1" 9|9Hk1 6[l{@*r" 'Loop the file list, skip the two header lines and write the remaining data to file !;~6nYY Dim lineArray() As String, curLine As Long TE t+At`] For Each curFile In fList sqP (1|9 Print "Merging data from file " & curFile @?\[M9yK ReadFile( cDir & curFile, lineArray ) lgaE2`0 [3 For curLine = 2 To UBound(lineArray) jj8h>"d Print #1, lineArray(curLine) 2/ v9 Next Rw#4 |& Next Qfd4")zhG Jx_BjkF 'Close the output file ^YwTO/Q| Close #1 ^E349c-| 1#-=|:U Print "Finished merging RPC data for sample " & sampName z6f N)kw Print "FRED formatted data file: " & Chr(9) & outFile M5>cYVG End Sub w5tcO%+k1 8s#2Zv 'Utility function to read the contents of a file into an array of strings. }*s%|!{H Function ReadFile(ByVal fileName As String, _ \OX;ZVb?5 ByRef lineArray() As String) As Long ;u
"BCW \>@QJ ReadFile = -1 9et%Hn.K' Dim oFSO As Object @XRN#_{ Set oFSO = CreateObject("Scripting.FileSystemObject") L5-Kw+t Erase lineArray ^B`*4 <W<>=vDzyE Dim fid As Long 1 /dy@' If oFSO.fileexists( fileName ) Then 8)
1+j>OQ fid = FreeFile() |E#+X Open fileName For Input As fid WY 'QhieH lineArray = Split(Input(LOF(fid), fid), vbCrLf) ql_GN[c/ Close fid b6y/o48 End If u~y0H Set oFSO = Nothing IGC:zZ~z Return UBound( lineArray ) m^M sp:T, /$NZj"# End Function ]= nM|e u|}p3-z|Y Sub GetFileList( ByVal in_dir As String, _ B(TE?[ # ByRef in_flist() As String ) K~DQUmU@ o,yP9~8\ 'Redimension the file list array SZ'2/#R> Erase in_flist _2N7E#m" S M~jV"OF= 'Tracks how many files are found v@^P4cu; Dim fCount As Long >/5'0n_R fCount = 0 48 n5Y~YS ;:5Ahfo \ 'Recurse directory and search for text files XD=p:Ezh Dim f As String WY)*3? f = Dir$(in_dir & "*.txt") aUTXg60l* While f <> "" .lt|$[" ReDim Preserve in_flist(fCount) 8pZGu8 in_flist(fCount) = f / 80Q fCount += 1 @G&2Tbj[` f = Dir$() Z>t,B%v Wend v3q.,I_ ReDim Preserve in_flist(fCount-1) #o/ MaS"V`NI End Sub aI'MVKwMk 4u.Fy<+@4M zOfMKrRG QQ:2987619807 2#hfBJg@
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