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摘要: 2s}G6'xE]P w%(D4ldp 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。 1v*N]}`HU )5u#'5I> 背景: 2 ]n4)vv, 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。 O^_CqT% 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。 %AA-G 图1. RPC Photonics工程漫射体结构及光束投射形状 >O0<u qKE +,g' m ;wj|@cF 步骤 kIRjoKf <F 7cO1(yE#vr 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。 "BIhd*K[~ V;gC[7H 图2. RPC Photonics工程漫射体不同类型的散射数据 hsJGly5H 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) ! vuun | 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 fS p 例如下所示: ""IPaNHQ Sample name: EDF-C1-56 ;@O8y\@ Merging data from file EDF-C1-56 0-0.txt
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Finished merging RPC data for sample EDF-C1-56 ]ZH6
.@| FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,rOh*ebF 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 l~[
K.p& a. 创建一个新的散射库 z>b^Ui0 b. 散射模型命名 %BQ?DTtb7' c. 改变散射模型为“Tabulated BSDF”. SZ:R~4 A 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 )
$QwzL/a 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。 j$4lyDfD f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, IR32O,) g. 点击OK cQ3p|a ` 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 UG]x CkDS uE>m3Y(aP bAUYJPRpy 脚本代码: %&J`mq 4 b}'W} '#Language "WWB-COM" #A:^XAU1Z@ \w-3Spk* Option Explicit h;mOfF dP"cm0 Sub Main 2} _^~8 @KJmNM1]V 'Cleanup 8E>2
6@. ClearOutputWindow() e}s,WC2- pV1;gqXNS Print "Merging RPC Photonics BSDF Data Files" v7v> SetTextColor(255,0,0) g_eR&kuh Print "Note: Script should be located in the same folder as the BSDF TXT files." 2o7o~r Print "Note: Do not run this script multiple times without deleting the output file between executions." "$q"Kilj% SetTextColor(0,0,0) Z/;hbbG g@]1H41 'Current directory of this script (should be the same as the text files being merged) n.,ZgLx[" Dim cDir As String waG &3m cDir = MacroDir$ & "\" ca[*#xiJ rLbFaLeQ 'Array which will be populated with the list of files to be merged Np;tpq~ Dim fList() As String, curFile As String )=5*iWe GetFileList( cDir, fList ) }IQ! [T5 mXu";?2 Print "" 5nK|0vv%2 Print "Files found for merging:" )-1$y+s>
For Each curFile In fList @@}muW>;T Print Chr(9) & curFile -*2b/=$u Next k"cKxzB TLg 9`UA 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5oOs.(m|*C Dim nameArray() As String, sampName As String Rli`]~!w nameArray = Split(fList(0)," 0-0.txt") ^plP1c: sampName = nameArray(0) :ra[e(l9 Print "" Z7Nhb{ Print "Sample name: " & Chr(9) & sampName :4pO/I
~ OQDx82E 'Open an output file and write the FRED header data 7j"B-k# Dim outFile As String {q&A/ outFile = cDir & sampName & "_FRED.txt" T <RWz Open outFile For Output As #1 GB}X Print #1, "type bsdf_data" 2O2d*Ld> Print #1, "format angles=deg bsdf=value scale=1" z] |Y $:?=A5ttuo 'Loop the file list, skip the two header lines and write the remaining data to file zeH=py[n Dim lineArray() As String, curLine As Long C%P.`Nx A For Each curFile In fList Y1BxRd?D Print "Merging data from file " & curFile (e3?--~b6 ReadFile( cDir & curFile, lineArray ) /FcwsD\=$ For curLine = 2 To UBound(lineArray) " j:15m5 Print #1, lineArray(curLine) \d w ["k Next /!y3ZzL Next 1z3I^gI*i NE Z ]% 'Close the output file ]O~/k~f Close #1 <q|eG\01S +:z%#D Print "Finished merging RPC data for sample " & sampName S7CD#Y[s Print "FRED formatted data file: " & Chr(9) & outFile >
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? End Sub *Oy%($' UZE%!OWpeK 'Utility function to read the contents of a file into an array of strings. > 'JWW*Y! Function ReadFile(ByVal fileName As String, _ ` $[`C/h ByRef lineArray() As String) As Long o2LUB)=R' $U%N$_k? ReadFile = -1 2f9%HX(5 Dim oFSO As Object RY*s }f Set oFSO = CreateObject("Scripting.FileSystemObject") 3N{
ZX{} Erase lineArray AOCiIPw
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Dim fid As Long y(Q.uYz* If oFSO.fileexists( fileName ) Then yn{U/+ fid = FreeFile() M]e _@:! Open fileName For Input As fid d.NB@[?* lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8SMa5a{ Close fid yy\d<-X~ End If f=40_5a6 Set oFSO = Nothing om,=.,|Ld Return UBound( lineArray ) bJ6v5YA% *\[GfTL End Function B 6,X) hfQ^C6yR Sub GetFileList( ByVal in_dir As String, _ O[&G6+ ByRef in_flist() As String ) [0n&?<< 1
BVpv7@ 'Redimension the file list array lb #`f,r> Erase in_flist 5LxzET"P :*lB86Ly 'Tracks how many files are found $qhVow5~ Dim fCount As Long .{k^
tf4 fCount = 0 h&?tF~h skfFj&_T 'Recurse directory and search for text files `LVX|l62 Dim f As String D,'@b+B[ f = Dir$(in_dir & "*.txt") wB0ONH[ While f <> "" 1He'\/# ReDim Preserve in_flist(fCount) ehls:)F in_flist(fCount) = f -o0~xspF fCount += 1 {2%@I~US f = Dir$() LgS.%Mn Wend "@E(}z'sM ReDim Preserve in_flist(fCount-1) YPsuG -is 9#niMv9 End Sub Y<-dd"\
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