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摘要: Q+uYr- IJ=~hBI 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。 ]Oe#S"-Oo ;AHa|35\ 背景: H!vvdp?Z 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。 r5r K> 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。 < FN[{YsA 图1. RPC Photonics工程漫射体结构及光束投射形状 sV{[~U,| P$w0.XZa YK_a37E{F 步骤 X hTp'2,] Grkj@Q* 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 #&Biu}4D oIf-s[uH 图2. RPC Photonics工程漫射体不同类型的散射数据 y" P$:l 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) \N7
E!82 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 Cee?%NaTS 例如下所示: %tmK6cY4Y Sample name: EDF-C1-56 szWh#O5= Merging data from file EDF-C1-56 0-0.txt ]<{BDXIGIE Finished merging RPC data for sample EDF-C1-56 C>t1~^Q},9 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt aS62S9nwX 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,mjwQ6:Ny a. 创建一个新的散射库 uKhfZSx0w b. 散射模型命名 1*(^<x+n c. 改变散射模型为“Tabulated BSDF”. .Ml}cE$L d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /sC$;l 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。 =V%s^ 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, lvk(q\-f g. 点击OK mp!6MO Q 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 D4;V8(w=# 3'*SSZmnOB QT^W00h 脚本代码: G^j/8e StaX~J6= '#Language "WWB-COM" zj"J~s;? uppA`> Option Explicit F8>Fp" r|6S&Ia> Sub Main (fb&5=Wzw gmy_ZVU' 'Cleanup w6v P
a ClearOutputWindow() YD7i6A D_(xhM Print "Merging RPC Photonics BSDF Data Files" Ah)_mxK SetTextColor(255,0,0) l+y/ Mq^QB Print "Note: Script should be located in the same folder as the BSDF TXT files." lLyMm8E%pZ Print "Note: Do not run this script multiple times without deleting the output file between executions." FC/m,D50oI SetTextColor(0,0,0) TV0(uMZ0+' pZ%/;sxYa 'Current directory of this script (should be the same as the text files being merged) d,6 Z Dim cDir As String Quc9lL cDir = MacroDir$ & "\" 2*F["E VQ{}S $jQ 'Array which will be populated with the list of files to be merged lmo>z'< Dim fList() As String, curFile As String
&tkkn2t GetFileList( cDir, fList ) Iy6"2$%a k2_ " Print "" rwv_
RN Print "Files found for merging:" bJmVq%>; For Each curFile In fList 0^?(;AK Print Chr(9) & curFile w J/k\ Next '9H7I! L@ 1 nIb/nY 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. c<r`E Dim nameArray() As String, sampName As String GGo
nA nameArray = Split(fList(0)," 0-0.txt") -A[iTI" sampName = nameArray(0) tE/j3 Print "" RYZh"1S;k Print "Sample name: " & Chr(9) & sampName 3^xTZ*G S/"-x{Gc2v 'Open an output file and write the FRED header data !6'j
W! Dim outFile As String H
:}|UW outFile = cDir & sampName & "_FRED.txt" <2HI. @^ Open outFile For Output As #1 V)^nVD)e Print #1, "type bsdf_data" 6-{QU] # Print #1, "format angles=deg bsdf=value scale=1" XwOj`N{!H D[x0sly 'Loop the file list, skip the two header lines and write the remaining data to file =mxmJFA Dim lineArray() As String, curLine As Long N5Eb.a9S For Each curFile In fList w4<RV:Vmt Print "Merging data from file " & curFile KA#4iu{ ReadFile( cDir & curFile, lineArray ) NmthvKhH For curLine = 2 To UBound(lineArray) BI?M/pIm Print #1, lineArray(curLine) 4Cr|]o' Next P ^R224R Next [R iCa yk5-@qo 'Close the output file U{gJn#e/. Close #1 Fyrr,# d nWh}! Print "Finished merging RPC data for sample " & sampName ( ?3 )l Print "FRED formatted data file: " & Chr(9) & outFile -)(HG)3 End Sub 8
C @iD% Sp: `Z1kH 'Utility function to read the contents of a file into an array of strings. bm*Ell\a. Function ReadFile(ByVal fileName As String, _ v?F~fRH ByRef lineArray() As String) As Long J~9l+? ZP61T*n ReadFile = -1 "yxIaTZu Dim oFSO As Object OWT5Bjl Set oFSO = CreateObject("Scripting.FileSystemObject") PXz,[<ET?# Erase lineArray YIGQDj@ kaQn'5 Dim fid As Long c&z@HEzV7 If oFSO.fileexists( fileName ) Then q$7WZ+Y\ fid = FreeFile() DfgqB3U[ Open fileName For Input As fid HWG5Ghu8,) lineArray = Split(Input(LOF(fid), fid), vbCrLf) w0(A7L:L Close fid hdJW#,xq End If uA dgR Set oFSO = Nothing vzA)pB~; Return UBound( lineArray ) ORHs1/L`j |fkz=*rn End Function >xb}AY; & F\HR Sub GetFileList( ByVal in_dir As String, _ PMC5qQ%x ByRef in_flist() As String ) T+7-6y+ d h BD .IB 'Redimension the file list array 1Ys6CJ# Erase in_flist Q{1Q w'+@ IIcG+zwx 'Tracks how many files are found ;DbEP. %u$ Dim fCount As Long p(o"K@I fCount = 0 yXyL,R Dz4e.tvN 'Recurse directory and search for text files Hy}oSy26 Dim f As String VJquB8?H
f = Dir$(in_dir & "*.txt") ahQdBoj While f <> "" 6jz6
ReDim Preserve in_flist(fCount) Ud@D%?A7 in_flist(fCount) = f KCEBJ{jM fCount += 1 2H+!78 f = Dir$() otTv,T182 Wend /,#HGu]q' ReDim Preserve in_flist(fCount-1) }t5-%&gBY0 n$]78\C End Sub aTXmF1_n
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