RPC Photonics扩散片BSDF
摘要: cUNGo%Y -sx-7LKi 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。 i&1U4q F*X%N_n 背景: ?.~]mvOR 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。 v2(U(Tt 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。 6s&qZ+v-
图1. RPC Photonics工程漫射体结构及光束投射形状 F;X"3F.! +&?'KZ+Z_v Kj=;>u 步骤 (Q\\Gw -t%L#1k 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。 )I?RMR 8 `o{b"l+
图2. RPC Photonics工程漫射体不同类型的散射数据 jJ*=Ghu- 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) &1oaZY w 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 "zXGp7Q'# 例如下所示: B6(h7~0(< Sample name: EDF-C1-56 GPMrs)J*! Merging data from file EDF-C1-56 0-0.txt !>q?dhw@ Finished merging RPC data for sample EDF-C1-56 `|uoqKv FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt v)%[ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (}sDm~;s a. 创建一个新的散射库 Wf_CR( b. 散射模型命名 8~}s 3j4 c. 改变散射模型为“Tabulated BSDF”. H'D#s;SlR 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 ) `~0P[>|+ 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。 otoBb^Mz 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, Jm%mm SYK g. 点击OK p|b+I"M 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 {WIY8B'c $R8>u#K! C+T&O 脚本代码: (/('nY a4Ls^ '#Language "WWB-COM" S_ZLTcq<1 zUNH8=U Option Explicit uAc@ Z- G OH Sub Main ^}>zYt o?;F.W_ 'Cleanup ]s f2"~v ClearOutputWindow() +SO2M|ru& r[6#G2 Print "Merging RPC Photonics BSDF Data Files" c6f|y_2 SetTextColor(255,0,0) Zlr{L]c
Print "Note: Script should be located in the same folder as the BSDF TXT files." \nrgAC-b Print "Note: Do not run this script multiple times without deleting the output file between executions." 2O$95M SetTextColor(0,0,0) Cc@=? UwZu:[T6H 'Current directory of this script (should be the same as the text files being merged) Czq1
kz Dim cDir As String >6*(}L9 cDir = MacroDir$ & "\" bELIRM9 '.=Wk^,Ua 'Array which will be populated with the list of files to be merged lv=yz\ Dim fList() As String, curFile As String ,Le&I9*% GetFileList( cDir, fList ) -J-3_9I <jpe u^7 Print "" t|go5DXz4 Print "Files found for merging:" Lhl$w'r For Each curFile In fList : =
]sq}IN Print Chr(9) & curFile MFf05\aDu Next hO5K\QnRL i7i|370 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. &oon'q5; Dim nameArray() As String, sampName As String 1M7\:te* nameArray = Split(fList(0)," 0-0.txt") LvSP #$f sampName = nameArray(0) aQl?d<|+lk Print "" BM|-GErE Print "Sample name: " & Chr(9) & sampName NFrNm'v N$N;Sw 'Open an output file and write the FRED header data l*F!~J3 Dim outFile As String ,k4z; outFile = cDir & sampName & "_FRED.txt" )?!vJb" Open outFile For Output As #1 #]5&mKi Print #1, "type bsdf_data" +A]&AkTw Print #1, "format angles=deg bsdf=value scale=1" WF+bN#YJ ~C}(\8g 'Loop the file list, skip the two header lines and write the remaining data to file 4RK.Il*d Dim lineArray() As String, curLine As Long uAW*5 `[ For Each curFile In fList Kj~>&WU Print "Merging data from file " & curFile `E./p ReadFile( cDir & curFile, lineArray ) kS@9c _3S For curLine = 2 To UBound(lineArray) }}kS~
w-# Print #1, lineArray(curLine) E9L!O.Q Next )ZS:gD Next gi1}5DR &(5^vw<0 'Close the output file XD_P\z Close #1 s[0prm5. {B'Gm]4 Print "Finished merging RPC data for sample " & sampName ,Hik (22 Print "FRED formatted data file: " & Chr(9) & outFile j\XX:uU_ End Sub b5iIV1g -IpV'%nX; 'Utility function to read the contents of a file into an array of strings. u#zP>! Function ReadFile(ByVal fileName As String, _ ]7#^])> ByRef lineArray() As String) As Long _9}x2uO~ 5@w'_#!) ReadFile = -1 ^yn[QWFO Dim oFSO As Object lU&`r:1>_ Set oFSO = CreateObject("Scripting.FileSystemObject") M9uH&CD6U Erase lineArray H3
A]m~=3 K B`1% = Dim fid As Long @&~OB/7B: If oFSO.fileexists( fileName ) Then "<cB73tY fid = FreeFile() DuTlYXM2^ Open fileName For Input As fid hO+O0=$}wN lineArray = Split(Input(LOF(fid), fid), vbCrLf) +Op%,,Db Close fid *@\?}cX End If d&[M8( Set oFSO = Nothing ;[WSf{k Return UBound( lineArray ) OH-~ S7Iu?R_I End Function g( @$uJ [[*0MA2Y Sub GetFileList( ByVal in_dir As String, _ Ux%\Y.PPI ByRef in_flist() As String ) bMK#^ZoH Lyf? V(S 'Redimension the file list array ;qMnO_E Erase in_flist h-?q6O/| >,]
eL 'Tracks how many files are found [B2>*UPl Dim fCount As Long 4y]: Gqz~ fCount = 0 ijZydn c{]r{FAx9o 'Recurse directory and search for text files T>%uRK$ Dim f As String J^s< |