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摘要: ex#-,;T gL~3z'$ 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。 +xAD;A4 qC=9m[MI 背景: 62kA(F0e, 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。 ?VCp_Ji 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。 KSJ+3_7]k 图1. RPC Photonics工程漫射体结构及光束投射形状 gil:SUW1r vTo+jQs^ h@]{j_$u 步骤 A#{I-*D[ :fDzMD 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。 fu{v(^ jd2 p~W 图2. RPC Photonics工程漫射体不同类型的散射数据 ([|^3tM 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) [0 rH/{ 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 h+7U'+|%A 例如下所示: Lr20xm Sample name: EDF-C1-56 W6`_lGTj Merging data from file EDF-C1-56 0-0.txt x?]fHin_ Finished merging RPC data for sample EDF-C1-56 PT~F^8,) FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Lp3pJE
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P9R-41! a. 创建一个新的散射库 X40JCQx{+ b. 散射模型命名 Zx`/88!x[ c. 改变散射模型为“Tabulated BSDF”. Vx:uqzw# 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 ) c6 .j$6t e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ,S
m?2< f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, @My
RcC g. 点击OK (#x&Y#5 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 YzJWS|] [vz2< genn _v8u% 脚本代码: ,$aqF<+; ?r*}1WsH '#Language "WWB-COM" 4uh~@ Lv FjI1'Ah\ Option Explicit J*zQ8\f=} $C,`^n' Sub Main t'yh&44_ vR pO0qG 'Cleanup O'(D:D? ClearOutputWindow() "r8N-
h/P asE.!g? Print "Merging RPC Photonics BSDF Data Files" fGW~xul_ SetTextColor(255,0,0) +6~zMKp Print "Note: Script should be located in the same folder as the BSDF TXT files." RH$l?j6 Print "Note: Do not run this script multiple times without deleting the output file between executions." !b+!] 2~g} SetTextColor(0,0,0) [z*1#lj S bSQj=|h1 'Current directory of this script (should be the same as the text files being merged) zGc]*R Dim cDir As String !HtW~8|: cDir = MacroDir$ & "\" FW)~e*@8= In;P33'p 'Array which will be populated with the list of files to be merged l)~$/#k Dim fList() As String, curFile As String a1ps'^Qhh GetFileList( cDir, fList ) (WP^}V5 {iCX?Sb Print "" 0W_u"UY$c Print "Files found for merging:" ~0o>B$xJ For Each curFile In fList ooCfr?E Print Chr(9) & curFile ~$rSy|19 Next _;/+8= c>! ^\ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. |VjD. ]I Dim nameArray() As String, sampName As String F7/%,vf nameArray = Split(fList(0)," 0-0.txt") 0-uVmlk=/ sampName = nameArray(0) ) 3V1aC Print "" RE-y5.kE^ Print "Sample name: " & Chr(9) & sampName T1 1>&K) W^c /l*>v 'Open an output file and write the FRED header data &" 5Yt&{ Dim outFile As String ~]9EhC'l outFile = cDir & sampName & "_FRED.txt" ah(k!0PV Open outFile For Output As #1 ($8!r|g5# Print #1, "type bsdf_data" 3<[q>7X Print #1, "format angles=deg bsdf=value scale=1" Q4Qf/q;U ;#8xRLW 'Loop the file list, skip the two header lines and write the remaining data to file -a"b:Q Dim lineArray() As String, curLine As Long :~ 	 For Each curFile In fList h2= wC. Print "Merging data from file " & curFile R((KAl]dL ReadFile( cDir & curFile, lineArray ) r%>7n,+o For curLine = 2 To UBound(lineArray) :QHh;TIG=< Print #1, lineArray(curLine) T-x9IoE Next ?k@;,l :s Next C*11?B[ [M:<!QXw 'Close the output file FBOgaI83G Close #1 rd24R-6 ~zvZK]JoX Print "Finished merging RPC data for sample " & sampName {Q`Q2'@ Print "FRED formatted data file: " & Chr(9) & outFile )jjaY1E End Sub o3NB3@uj< )(c%QWz 'Utility function to read the contents of a file into an array of strings. !kH 1| Function ReadFile(ByVal fileName As String, _ >7cDfv" ByRef lineArray() As String) As Long 3{Zd<JYg4- 10GU2a$0"$ ReadFile = -1 ER}5`*X{ Dim oFSO As Object rZ.z!10 Set oFSO = CreateObject("Scripting.FileSystemObject") sheCwhV Erase lineArray dl`{:ZR S N-Bw&hEZ Dim fid As Long ^ ]+vtk If oFSO.fileexists( fileName ) Then pwB>$7(_h fid = FreeFile() %F}d'TPx Open fileName For Input As fid nyOmNvZf lineArray = Split(Input(LOF(fid), fid), vbCrLf) q]s_ hWWv Close fid NQcg}y End If FJ{&R Ld Set oFSO = Nothing jz>b>; Return UBound( lineArray ) M=4b qd~9uo&[Ig End Function S/l6c P Ka%#RNW Sub GetFileList( ByVal in_dir As String, _ M7-2;MZ ByRef in_flist() As String ) 5dbj{r)s6i 1F+JyZK}w 'Redimension the file list array 9ESV[ Erase in_flist 5v=e(Ph+ H7meI9L 'Tracks how many files are found SO<9?uk. Dim fCount As Long 2i NZz fCount = 0 cJM.Q_I}Y T{=&>pNK[ 'Recurse directory and search for text files O.8k [Ht Dim f As String a(G}< f = Dir$(in_dir & "*.txt") p9S>H While f <> "" IABF_GwF ReDim Preserve in_flist(fCount) ,pVe@ d' in_flist(fCount) = f ft4hzmuzM fCount += 1 ~]'yUd1gSZ f = Dir$() gyT0h?xDt Wend d'b9.ki\ ReDim Preserve in_flist(fCount-1) .SNg2. ),^pi? End Sub .kgt?r
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