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摘要: `,TPd ~#~ 9;.dNdg> 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。 s*rtm i^j{l_-JE 背景: =PXNg!B}D* 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。 #~(@Ka.eA0 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。 /K'Kx 图1. RPC Photonics工程漫射体结构及光束投射形状 1w?X~VZAX A*W QdY &u$l2hSS 步骤 vVE^Y 'tF<7\! 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 n1$p
esr I#9A\.pO 图2. RPC Photonics工程漫射体不同类型的散射数据 z^~fVl 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) ~ 5`Ngpp 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 v)BUt,A 例如下所示: ~KEnZa0 Sample name: EDF-C1-56 _)lK.5 Merging data from file EDF-C1-56 0-0.txt sd
Z=3) Finished merging RPC data for sample EDF-C1-56 df}B:?Ew. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt vrh}X[JEw' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $yRbo'- a. 创建一个新的散射库 852$Ui|I b. 散射模型命名 D`iWf3a. c. 改变散射模型为“Tabulated BSDF”. Q TM+WD 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 ) U.d*E/OR5 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。 R0 {+Xd 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, Xig%Q~oMp g. 点击OK DtyT8kr 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Xo }w$q5 CEt_wKzf &9IMZAo 脚本代码: S =eP/
W&6ye '#Language "WWB-COM" k:R9wo (Z
sdj Option Explicit !j [U s|YY i~ Sub Main ^h=;]vxO }Li24JK 'Cleanup *COr^7Kf5 ClearOutputWindow() E9QNx62 /\h&t6B1 Print "Merging RPC Photonics BSDF Data Files" lLoFM SetTextColor(255,0,0) Eo)n(
Z9 Print "Note: Script should be located in the same folder as the BSDF TXT files." NcRY
Ch Print "Note: Do not run this script multiple times without deleting the output file between executions." KG)Y{-Ao SetTextColor(0,0,0) oQFpIX;\m j =[Td 'Current directory of this script (should be the same as the text files being merged) 4LKOBiEM Dim cDir As String RVX-3FvP cDir = MacroDir$ & "\" dAohj
QH: N!^U{;X7/ 'Array which will be populated with the list of files to be merged .#EmE'IP* Dim fList() As String, curFile As String ln#Lx&r;| GetFileList( cDir, fList ) !)KX?i[Q ?zKDPBj
Print "" ^BSMlKyB Print "Files found for merging:" L@9"6& For Each curFile In fList Mt<TEr}7Z= Print Chr(9) & curFile W/xb[w9v Next Fp|x,- qzsS"=5 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. KGzBK: Dim nameArray() As String, sampName As String a{,EX[~b nameArray = Split(fList(0)," 0-0.txt") -0Y8/6]( sampName = nameArray(0) tb^3-ZUb Print "" L0_R2EA Print "Sample name: " & Chr(9) & sampName \<a(@#E*~ / IAK'/ 'Open an output file and write the FRED header data GYyP+7K4l[ Dim outFile As String "~N#Jqzr: outFile = cDir & sampName & "_FRED.txt" |'b=xeH.^< Open outFile For Output As #1 f
\[Z`D Print #1, "type bsdf_data" s0qA8`Yu Print #1, "format angles=deg bsdf=value scale=1" Of SYOL7o "PLZZL$+ 'Loop the file list, skip the two header lines and write the remaining data to file p 8Ts5n Dim lineArray() As String, curLine As Long $yI!YX& For Each curFile In fList E;9SsA
Print "Merging data from file " & curFile SPn0D9b] ReadFile( cDir & curFile, lineArray ) 6*{N{]`WZ) For curLine = 2 To UBound(lineArray) J'.U+XU Print #1, lineArray(curLine) zf4@:GM` Next VLkK6W.u Next e(,sFhR owJPEx 'Close the output file {{SeD:hx Close #1 &iId<.SiJ (KK9/k Print "Finished merging RPC data for sample " & sampName %7z Print "FRED formatted data file: " & Chr(9) & outFile "#qyX[\ End Sub Tr-gdX ; nkSYW]aQ1g 'Utility function to read the contents of a file into an array of strings. |*e
>hk Function ReadFile(ByVal fileName As String, _ GadQ \> ByRef lineArray() As String) As Long `$fwLC3j Cn[`] ReadFile = -1 htq#( M Dim oFSO As Object <._MNHC Set oFSO = CreateObject("Scripting.FileSystemObject") NUX0=(k Erase lineArray w`UB_h#Bl ?6; +.h\ Dim fid As Long ]b-Z;Nce If oFSO.fileexists( fileName ) Then a)`b;]+9 fid = FreeFile() &w- QMjM> Open fileName For Input As fid Yvcd(2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) !/BXMj,= Close fid =O<Ul~JRK End If 3<AZ,gF1 Set oFSO = Nothing bYYyXM Return UBound( lineArray ) )K4 |-<i .u>IjK^ End Function a#nVRPU8m 3BDAvdJ4. Sub GetFileList( ByVal in_dir As String, _ _}vD?/$L ByRef in_flist() As String ) U:M?Ji5CY I?.$ 'Redimension the file list array AL>*Vj2h/n Erase in_flist $RuJm\f 2a3hm8%U 'Tracks how many files are found Rq%g5lK Dim fCount As Long 5P,{h fCount = 0 |-bSoq7t mA|!IhM 'Recurse directory and search for text files Q?B5@J Dim f As String Ysz{~E' f = Dir$(in_dir & "*.txt") 4/e-E^ While f <> "" <iajtq<Z ReDim Preserve in_flist(fCount) \H!ECTI in_flist(fCount) = f KDhr.P.~ fCount += 1 F0t!k> f = Dir$() H-K,Q%;C@ Wend G9TK)Nz ReDim Preserve in_flist(fCount-1) <(TTYf8lS Yc/Nz(m End Sub (Eq0 |"cj &B1d+.+ )2C_6eR QQ:2987619807 ;;pxI5
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