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摘要: 4q#6.E;yy 1];rW`Bw 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。 9t@^P^}=\m vw=OGjT_>m 背景: jqxeON 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。 amq]&.M 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。 = !7k/n'; 图1. RPC Photonics工程漫射体结构及光束投射形状 fy04/_,q jv7-i'I@ =g4^tIYq 步骤 RG/M- d%_v
eVIe 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。 &No6k~T0:b Poy ]5:. 图2. RPC Photonics工程漫射体不同类型的散射数据 a@ `1 5O: 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) ^2E\{$J 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ry9%Y3 例如下所示: 3a PCi>i!_ Sample name: EDF-C1-56 :e> y=
s> Merging data from file EDF-C1-56 0-0.txt WNSf$D{p Finished merging RPC data for sample EDF-C1-56 cF!ygz// FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Nq'Cuwsp 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h(]aP<49L a. 创建一个新的散射库 4cJ7W_ >i6 b. 散射模型命名 H59}d
oKH c. 改变散射模型为“Tabulated BSDF”. +c4]}9f! 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 ) y<mmv~= 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。
FEj{/ 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, *izPLM}+ g. 点击OK O="#yE) 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 j`jF{k b V`xZ4 i%L f)w>V3~w, 脚本代码: N,U<.{T=A rlG&wX '#Language "WWB-COM" L rV`P)$T rT$J0"*= Option Explicit 4_qd5K+n" eh_{- Sub Main g4USKJ19. 4i0~t~vDpr 'Cleanup >zcR ?PPs ClearOutputWindow() iu!j#VO X v;} !z Print "Merging RPC Photonics BSDF Data Files" mU.(aLHW SetTextColor(255,0,0) Zwj\Hz. Print "Note: Script should be located in the same folder as the BSDF TXT files." 0'u2xe Print "Note: Do not run this script multiple times without deleting the output file between executions." t\44 Pu% SetTextColor(0,0,0) ~lO^C xo{3r\u?} 'Current directory of this script (should be the same as the text files being merged) dL;C4[(N Dim cDir As String oE:9}]N_ cDir = MacroDir$ & "\" MX!t/&X(n } LuPYCzpu 'Array which will be populated with the list of files to be merged !14aw9Q Dim fList() As String, curFile As String ( iM*Y"Y GetFileList( cDir, fList ) UHr0J jQK dIk/vg Print "" <aps)vF Print "Files found for merging:" L3[r7 b For Each curFile In fList Q/[|/uNw? Print Chr(9) & curFile rPaUDR4U Next FPj j1U`C !Ld0c4 'Split the first text file name found to get the sample name. First file should be 0-0 measurement.
MZp` Dim nameArray() As String, sampName As String YC!Tgb~H nameArray = Split(fList(0)," 0-0.txt") pw;
sampName = nameArray(0) 7_t\wmvYp Print "" lq0@)'D Print "Sample name: " & Chr(9) & sampName u l[ edp_ ap|7./yg 'Open an output file and write the FRED header data x3ds{Z$,>( Dim outFile As String p.{9OrH(4 outFile = cDir & sampName & "_FRED.txt" ?VC[%sjwn Open outFile For Output As #1 vY|{CBGbd Print #1, "type bsdf_data" eu!B
, Print #1, "format angles=deg bsdf=value scale=1" s;oDwT1 6zuWG0t 'Loop the file list, skip the two header lines and write the remaining data to file -h=K]Y{` Dim lineArray() As String, curLine As Long _@U?;73"5 For Each curFile In fList vrVb/hhG Print "Merging data from file " & curFile :N!Fe7H, ReadFile( cDir & curFile, lineArray ) +E.}k!y For curLine = 2 To UBound(lineArray) q2Xm~uN`) Print #1, lineArray(curLine) $`7cs}# Next P%#WeQ+ Next Pl|e?Np ;O7CahdF 'Close the output file s^5KFK1 Close #1 R7~H}>uaF Y=RdxCCx4 Print "Finished merging RPC data for sample " & sampName &Xr@nt0H Print "FRED formatted data file: " & Chr(9) & outFile w74)kIi End Sub -]8cw#y
0A >T'=4n[' 'Utility function to read the contents of a file into an array of strings. 7.hgne'< Function ReadFile(ByVal fileName As String, _ ?.E ixGzI^ ByRef lineArray() As String) As Long _TF\y@hF*D e[txJ*SuO ReadFile = -1 X$"=\p>X Dim oFSO As Object jKFypIZ4 Set oFSO = CreateObject("Scripting.FileSystemObject") C>%2'S^.b Erase lineArray S`,(10Y qJq49}2 Dim fid As Long 8Ar5^.k If oFSO.fileexists( fileName ) Then Jjt'R`t%t fid = FreeFile() G2#={g{ Open fileName For Input As fid CV/ei,=9 lineArray = Split(Input(LOF(fid), fid), vbCrLf) `
VL`8 Close fid 4F_*,_Y End If nC Mv&{~
Set oFSO = Nothing
i <KWFF# Return UBound( lineArray ) 88 fH!6b (1.E9+MquU End Function 3#)I 7FG &\(p<TF Sub GetFileList( ByVal in_dir As String, _ z+ybtS>pZ ByRef in_flist() As String ) .
J"g.Q weMC9T)B 'Redimension the file list array KA )9&6 Erase in_flist 8KqrB! XA8{N 'Tracks how many files are found j$l[OZ:# Dim fCount As Long W,</ fCount = 0 rLMjN#`^ tb;!2$ 'Recurse directory and search for text files U1pL
`P1 Dim f As String w2BIf[~t f = Dir$(in_dir & "*.txt") V!!E)I While f <> "" j{)_&|^{ ReDim Preserve in_flist(fCount) 21Z}Zj in_flist(fCount) = f nic7RN?F< fCount += 1 CXqU<a& f = Dir$() R~40,$e{ Wend plL##?<D< ReDim Preserve in_flist(fCount-1) m/#)B6@A rUC@Bf End Sub nS xFz!
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