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摘要: <<#j?% 9:[L
WT& 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。 xb6y=L G%Dhj)2} 背景: c-s A?q#| 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。 '#Yqs/V 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。 8Qm%T7]UFb 图1. RPC Photonics工程漫射体结构及光束投射形状 pGO=3=O
:oN$w\A l:Hm|9UZ 步骤 Xu[(hT6 MTyBGrs( 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 o'#ow(X CN(}0/ 图2. RPC Photonics工程漫射体不同类型的散射数据 uC2-T5n' 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ^ " 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 a%FM)/oI|T 例如下所示: r0xmDJ@y Sample name: EDF-C1-56 LN!e_b Merging data from file EDF-C1-56 0-0.txt JSf \ApX Finished merging RPC data for sample EDF-C1-56 JJE3\
FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt P84uEDY 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8Pgw_ 21N1 a. 创建一个新的散射库 BNj@~uC{ b. 散射模型命名 ZjB]pG+ c. 改变散射模型为“Tabulated BSDF”. B_ x?s d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) JI5%fU%O#n e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ;1gWz
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, agI"Kh]j? g. 点击OK v4$"{W;' 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7k<6oM1 #?^%#"~4H 8*$HS.Db' 脚本代码: %k+G-oT5 &N+i3l6` '#Language "WWB-COM" F4R0A6HL *IGCFZbp41 Option Explicit QGq8r> <F%c"Rkh Sub Main e]!`Cl-f80 \H&8.<HJ 'Cleanup LA9'HC(5 ClearOutputWindow() 3<"!h1x5 ;1[a*z<l&s Print "Merging RPC Photonics BSDF Data Files" kWZ@v+Mk3 SetTextColor(255,0,0) kMJA#{< Print "Note: Script should be located in the same folder as the BSDF TXT files." :4\=xGiY Print "Note: Do not run this script multiple times without deleting the output file between executions." mD"[z}r) SetTextColor(0,0,0) `|2p1Ei %@,!
( 'Current directory of this script (should be the same as the text files being merged) .@`5>_ Dim cDir As String ^T< HD cDir = MacroDir$ & "\" j=U^+jAn ?cvV~&$gc 'Array which will be populated with the list of files to be merged {^jRV@ Dim fList() As String, curFile As String l'Kx#y$ GetFileList( cDir, fList ) Hl*V i3bQU H'_ v Print "" s9\N{ar# Print "Files found for merging:" />0
Bm`A For Each curFile In fList ;i>(r;ZM Print Chr(9) & curFile q L-Ni Next cAQ_/> ={k_
(8] 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. O,_k.EH Dim nameArray() As String, sampName As String \;FE@ nameArray = Split(fList(0)," 0-0.txt") ny'wS sampName = nameArray(0) 2E$K='H:, Print "" :RG=3T[ Print "Sample name: " & Chr(9) & sampName kBlk^=h<:w twr-+rm2 'Open an output file and write the FRED header data p`=v$_]?( Dim outFile As String F5s`AjU outFile = cDir & sampName & "_FRED.txt" d&owS+B{48 Open outFile For Output As #1 }9*N EU)o Print #1, "type bsdf_data" xO0}A1t
Wd Print #1, "format angles=deg bsdf=value scale=1" !M(3[(Ni d cG)ql4d 'Loop the file list, skip the two header lines and write the remaining data to file 6=3;(2u[C" Dim lineArray() As String, curLine As Long Bgf'Hm%r For Each curFile In fList PZYVLUw
` Print "Merging data from file " & curFile vo!QJ ReadFile( cDir & curFile, lineArray ) u+Sj#iZ For curLine = 2 To UBound(lineArray) QTmMj@R&( Print #1, lineArray(curLine) ?Hrj}K27 Next DWXHx Next 3T)_(SM" UPGS/Xs]1 'Close the output file M=t;t0 Close #1 <HXzcWQ$ K4vOy_wT Print "Finished merging RPC data for sample " & sampName r=cm(AHF Print "FRED formatted data file: " & Chr(9) & outFile >^bSjE End Sub :7L[v9' E/{v6S{)Y 'Utility function to read the contents of a file into an array of strings. uMb[0-5 Function ReadFile(ByVal fileName As String, _ Qk?J4 B ByRef lineArray() As String) As Long pdq5EUdS Gg# 1k TK ReadFile = -1 ]?*L"()kp Dim oFSO As Object xDO1gnH% Set oFSO = CreateObject("Scripting.FileSystemObject") z`2Ais@ao Erase lineArray CSVL,(Uw T;1aL4w" Dim fid As Long myqQqVW If oFSO.fileexists( fileName ) Then 3(
o~|% fid = FreeFile() %Y-KjSs+l Open fileName For Input As fid Rxl/)H[Lc" lineArray = Split(Input(LOF(fid), fid), vbCrLf) qE@H~& Close fid c-`izn] End If @E%fAC Set oFSO = Nothing X(qs]: Return UBound( lineArray ) !vGJ7 ?O.'_YS End Function >)8<d3m ;9)A+bD] Sub GetFileList( ByVal in_dir As String, _ Q4B(NYEu( ByRef in_flist() As String ) ,#8H9<O9t LjY@b 'Redimension the file list array 4O>0gK{w Erase in_flist 9ohO-t$XkY aFd87'^ 'Tracks how many files are found 6e4A|< Dim fCount As Long 39oI
&D>8 fCount = 0 VX,@Gp_' m :BVYS|% 'Recurse directory and search for text files 4cZlQ3OE. Dim f As String wY{!gQ f = Dir$(in_dir & "*.txt") ;
-,VJCPi While f <> "" PD`EtkUnv ReDim Preserve in_flist(fCount) *zl-R*bM$ in_flist(fCount) = f TLT6z[ fCount += 1 LR%P\~ f = Dir$() 3}x6IM2 Wend !HSX:qAP$ ReDim Preserve in_flist(fCount-1) P%y$e0 o!sHK9hvJ) End Sub JTdcLmL
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