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摘要: @uldD"MJ<] <r.QS[:h 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。 d?T!)w \yC /OLXq 背景: zh*D2/r 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。 %l!?d`? 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。 Hd\V?#H 图1. RPC Photonics工程漫射体结构及光束投射形状 9$HBKcO >ItT269G 8hD[z} 步骤 0hV#]`9`gN c|;n)as9(% 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。 4P k%+l YLGE{bS 图2. RPC Photonics工程漫射体不同类型的散射数据 |w}j!}u 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) HFZ'xp|3dn 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 @,TIw[p 例如下所示: XhHgXVVGG< Sample name: EDF-C1-56 ;Pt8\X Merging data from file EDF-C1-56 0-0.txt "(7y%TFt: Finished merging RPC data for sample EDF-C1-56 !>n!Q*\(Ov FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt >&KH!:OX| 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 rZJJ\ , | a. 创建一个新的散射库 ~TEn + b. 散射模型命名 $R/@8qnP
W c. 改变散射模型为“Tabulated BSDF”. |HD>m'e d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) {pIh/0 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 8qg%>ZU4d f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, SL- 2 ^\R g. 点击OK H.ksI;, 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 t{jY@JT| :LY.C<8 m0TV i] v 脚本代码: !6%?VJB|b QQ .?A(U7 '#Language "WWB-COM" p%>sc FL^ _)` Option Explicit KtL?,zi ;+E]F8G9r Sub Main t.28IHJ /)sP, 2/ 'Cleanup *v+l,z4n ClearOutputWindow() gHBv Q1g vS>'LX Print "Merging RPC Photonics BSDF Data Files" cZNcplt8 SetTextColor(255,0,0) cQ j`W
* Print "Note: Script should be located in the same folder as the BSDF TXT files." |6JKB' Print "Note: Do not run this script multiple times without deleting the output file between executions." a31e.36g SetTextColor(0,0,0) I.jqC2G ?f"5yQ-B 'Current directory of this script (should be the same as the text files being merged) C!*!n^qA Dim cDir As String v"o"W[ cDir = MacroDir$ & "\" <J&S[`U! EVX3uC}{ 'Array which will be populated with the list of files to be merged W/!P1M n Dim fList() As String, curFile As String [! $NTt_ GetFileList( cDir, fList ) K>$f#^ uGMzU&+ Print "" .P)lQk\ Print "Files found for merging:" `|ie#L(:7/ For Each curFile In fList gM3:J:N Print Chr(9) & curFile VO|ECB2e Next ~i5YqH0 kL*P 3
0 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. <u!cdYo@ Dim nameArray() As String, sampName As String u[b |QR=5 nameArray = Split(fList(0)," 0-0.txt") sE% $]Jp sampName = nameArray(0) n^4R]9U Print "" (?r,pAc: Print "Sample name: " & Chr(9) & sampName 0hemXvv1 p0@^1 'Open an output file and write the FRED header data <giBL L! Dim outFile As String ."$t&[;s outFile = cDir & sampName & "_FRED.txt" ]$@a.#} Open outFile For Output As #1 Food<(!.> Print #1, "type bsdf_data" :25LQf^nz Print #1, "format angles=deg bsdf=value scale=1" p@Y=6 Bw bqcCA91 'Loop the file list, skip the two header lines and write the remaining data to file k XSX<b <% Dim lineArray() As String, curLine As Long 1#A$&'&\J; For Each curFile In fList }<04\t? Print "Merging data from file " & curFile T$%|=gq ReadFile( cDir & curFile, lineArray ) t WI- For curLine = 2 To UBound(lineArray) m\`>N_4*9 Print #1, lineArray(curLine) )\akIA Next $d?W1D<A Next xqG<R5k>> .G O0xnm 'Close the output file dz_S6o ] Close #1 @sXv5kZ: &?@C^0&QV Print "Finished merging RPC data for sample " & sampName cV+?j}"*+ Print "FRED formatted data file: " & Chr(9) & outFile YaC%69C' End Sub U] LDi8 Nc:s+ o 'Utility function to read the contents of a file into an array of strings. N[e,){v Function ReadFile(ByVal fileName As String, _ L'= \|r ByRef lineArray() As String) As Long 4Z)s8sD KW $'J3
/C7 ReadFile = -1 =>$)F 4LW Dim oFSO As Object 6X \g7bg Set oFSO = CreateObject("Scripting.FileSystemObject") n=.P46| Erase lineArray 928_e)V Fv$tl)p* Dim fid As Long m{/7)2. If oFSO.fileexists( fileName ) Then ^jL '*&l fid = FreeFile() u R0UfKK Open fileName For Input As fid OIcXelS:@k lineArray = Split(Input(LOF(fid), fid), vbCrLf) ETp?R WXX Close fid xlI=)ak{ End If cM#rus?)+ Set oFSO = Nothing b:dN )m Return UBound( lineArray ) p#@ #$u- 9kL,69d2 End Function C96/ KF.{r Sub GetFileList( ByVal in_dir As String, _ _ \D% ByRef in_flist() As String ) #{cy( &cz r_T)|||v 'Redimension the file list array @-$8)?`q Erase in_flist HlGSt$woX GKBoSSnV& 'Tracks how many files are found GcBqe=/B! Dim fCount As Long ;*(-8R/ fCount = 0 Un6R)MVT 6r)P&J 'Recurse directory and search for text files ]~TsmR[ Dim f As String ^ ""edCs f = Dir$(in_dir & "*.txt") a1Fx|#!
mq While f <> "" &hOz(825r ReDim Preserve in_flist(fCount) H1bR+2s in_flist(fCount) = f n!jmxl$ fCount += 1 1JJsYX f = Dir$() >US*7m } Wend H[=\_X1o( ReDim Preserve in_flist(fCount-1) Y}?8 ">H*InF End Sub rAenxZ,tF ~7]V^tG jI-a+LnEm QQ:2987619807 \x<8
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