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摘要: i>]<*w ,>QMyI
hv 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。 L)R[)$2(g [`hE^chd 背景: k binf Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 !0!U01SWa FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ,{uW8L 图1. RPC Photonics工程漫射体结构及光束投射形状 20.-;jK :!+}XT7)/ }:RT,< 步骤 EZ%w= !e:iB7< 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 &sZ9$s:(^ OD?y 图2. RPC Photonics工程漫射体不同类型的散射数据 eC+"mhB 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) EI=Naq 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 ^6)GS%R 例如下所示: 't0+:o">: Sample name: EDF-C1-56 f.aB?\"f6 Merging data from file EDF-C1-56 0-0.txt Z#OhYm+y Finished merging RPC data for sample EDF-C1-56 B.}_], FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt kvW|= 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 sFQ4O- SM a. 创建一个新的散射库 !cEbzb b. 散射模型命名 H{\.g=01 c. 改变散射模型为“Tabulated BSDF”. `j&0VIU>> 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 ) M('s|>\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。 Z>(r9R3{ 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, "EcX_> g. 点击OK `1E|PQbWc 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b)on A| Snc;p |
((1V^ 脚本代码: '%zN KA 5~">l '#Language "WWB-COM" :]CzN^k(1c [x2JFS#4 Option Explicit qj~flw1: <*s"e)XeqF Sub Main &a%WM /9x{^ 'Cleanup Usa+b
A ClearOutputWindow() w5F4"nl#O} ]{f^;y8 Print "Merging RPC Photonics BSDF Data Files" di6B!YQP SetTextColor(255,0,0) s<[A0=LH Print "Note: Script should be located in the same folder as the BSDF TXT files." *4<4 Print "Note: Do not run this script multiple times without deleting the output file between executions." O1GDugZ SetTextColor(0,0,0) ~Cjz29|gp q,[k7&HS 'Current directory of this script (should be the same as the text files being merged) J>rka]* Dim cDir As String E,{GU cDir = MacroDir$ & "\" :ozV3`%$( T
n"e 'Array which will be populated with the list of files to be merged NH7`5mF$ Dim fList() As String, curFile As String aWyUu/g<A` GetFileList( cDir, fList ) XDPL;(? '3A+"k-}mh Print "" /b{o3, #.M Print "Files found for merging:" z;i4N3-: For Each curFile In fList "-w^D!C Print Chr(9) & curFile \7pipde Next ldA!ou7 PJzc=XPU 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. <d5@CA+M Dim nameArray() As String, sampName As String 6cM<>&e nameArray = Split(fList(0)," 0-0.txt") 6X/wdk sampName = nameArray(0) +' %@! Print "" `E@kFJ(<On Print "Sample name: " & Chr(9) & sampName KQ&Y2l1*>> "`pNH' 'Open an output file and write the FRED header data aF!E x Dim outFile As String 'It?wB W outFile = cDir & sampName & "_FRED.txt" i+g~ Uj}h Open outFile For Output As #1 8zY)J # Print #1, "type bsdf_data" n-DaX
kK Print #1, "format angles=deg bsdf=value scale=1" nqT> qS[Z &5?G-mn 'Loop the file list, skip the two header lines and write the remaining data to file }g~g50ci Dim lineArray() As String, curLine As Long >R!"P[* For Each curFile In fList 3UdU"d[75 Print "Merging data from file " & curFile Q]@c&* _| ReadFile( cDir & curFile, lineArray ) +R!zs For curLine = 2 To UBound(lineArray) /
s,tY74'5 Print #1, lineArray(curLine) ~W<CE_/]k Next _a](V6 Next Ly;I,)w Hou*lCA 'Close the output file IV'p~t Close #1 w5`#q&? iv*V#J> Print "Finished merging RPC data for sample " & sampName owvS/"@ Print "FRED formatted data file: " & Chr(9) & outFile <47k@Ym End Sub }Z\wH*s` "+)K |9T# 'Utility function to read the contents of a file into an array of strings. OsQkA2= Function ReadFile(ByVal fileName As String, _ H3, ut ByRef lineArray() As String) As Long 8'A72*dhX afHaB/t{R ReadFile = -1 (9 sIA*,} Dim oFSO As Object <:&de8bT Set oFSO = CreateObject("Scripting.FileSystemObject") Rf)ke(" Erase lineArray ?c]n^GvG 5,1{Tv` Dim fid As Long _T5)n=| If oFSO.fileexists( fileName ) Then "xe=N fid = FreeFile() 4U=75!> Open fileName For Input As fid pj0fM{E lineArray = Split(Input(LOF(fid), fid), vbCrLf) @Y}uZ'jt' Close fid 24ux End If oKA& An Set oFSO = Nothing ZtK\HDdp Return UBound( lineArray ) *FK`&(B+} 87V1#U ^ End Function \=;uu_v$ T-gk <V Sub GetFileList( ByVal in_dir As String, _ Kc #|Z ByRef in_flist() As String ) _OMpIdY,R* .$&Q[r3Lu 'Redimension the file list array `pL^}_>|GM Erase in_flist >xqM5#m`E$ m}3gZu] 'Tracks how many files are found .$!{-v[ Dim fCount As Long e$e#NoN fCount = 0 C$d>_r h1[WhBL-O 'Recurse directory and search for text files cK@jmGj+ Dim f As String c>HK9z{ f = Dir$(in_dir & "*.txt") fY,|o3# While f <> "" x[(?# ReDim Preserve in_flist(fCount) geM6G$V& in_flist(fCount) = f 2&Jdf fCount += 1 %0,-.(h f = Dir$() N@xg:xr Wend 5GQLd ReDim Preserve in_flist(fCount-1) )J D(` 1u|V`J)0 End Sub QAPu<rdJP
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