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摘要: yOU(2"8p 3rW|kkn 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。 `:8J46or {PP9$>4`l 背景: a]17qMl Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 "Mw[P [w* FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Z%zj";C
G 图1. RPC Photonics工程漫射体结构及光束投射形状 ia&AW @}p2aV59 t.8 GT&p 步骤 RcG0 8p.) 'VyM{:8 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 {'sY|lou e1(Q(3 图2. RPC Photonics工程漫射体不同类型的散射数据 NL=|z=q 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) zLs|tJOVp 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 +CH},@j 例如下所示: EKEjv|_) Sample name: EDF-C1-56 `+'rib5 Merging data from file EDF-C1-56 0-0.txt oBQ#eW aY Finished merging RPC data for sample EDF-C1-56 h!~3Dw>,N FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt +y7;81ND 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 }VS3L_
;}/ a. 创建一个新的散射库 uzmk6G
v b. 散射模型命名 ]xC#rwHUC c. 改变散射模型为“Tabulated BSDF”. oVA?J%EK d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) <~}7Mxn%x@ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q$& sTM 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, )[H{yQ g. 点击OK MObt,[^W 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 rk+#GO{ WV3|?,y]qm \P} p5k[ 脚本代码: /kL$4CA qPB8O1fyU '#Language "WWB-COM" E J$36 q{s(.Uq$& Option Explicit C{sLz9 8h3=b[ Sub Main ]2# :tIC~GG]_) 'Cleanup ;Op3?_ ClearOutputWindow() ,fK3ZC V/cP4{L Print "Merging RPC Photonics BSDF Data Files" 'O5'i\uz SetTextColor(255,0,0) Q-ni| Print "Note: Script should be located in the same folder as the BSDF TXT files." G+B~Ix- Print "Note: Do not run this script multiple times without deleting the output file between executions." ;^*Unyt[4] SetTextColor(0,0,0) hjaT^(Y ]\/tVn.' 'Current directory of this script (should be the same as the text files being merged) mNmLyU=d Dim cDir As String D:k3"
E"S cDir = MacroDir$ & "\" o]nw0q?
NCxqh < 'Array which will be populated with the list of files to be merged D9`0Dr}/2 Dim fList() As String, curFile As String uwRr LF GetFileList( cDir, fList ) <0yE
5Mrf y=In?QN{6* Print "" .sQ=;w/ZA Print "Files found for merging:" xs\!$*R For Each curFile In fList OB[o2G <0 Print Chr(9) & curFile |
8qBm Next Q{k
At% )p!7#v/@f 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. >iS`pb Dim nameArray() As String, sampName As String z4&iK)x nameArray = Split(fList(0)," 0-0.txt") IbcZ@'RSw sampName = nameArray(0) }FzqW*4~ Print "" YF+n
b.0. Print "Sample name: " & Chr(9) & sampName aM7uBx\8 5 S1D@vnZ3O\ 'Open an output file and write the FRED header data ZeG_en ; Dim outFile As String gN)c outFile = cDir & sampName & "_FRED.txt" A
AHt218 Open outFile For Output As #1 Ed9Z9 Print #1, "type bsdf_data" h3T9"w[ Print #1, "format angles=deg bsdf=value scale=1" )'*5R <# b;)~wU= 'Loop the file list, skip the two header lines and write the remaining data to file =)hVn Dim lineArray() As String, curLine As Long ^$&k5e/}C For Each curFile In fList `R"I;qV Print "Merging data from file " & curFile WK="J6K5 ReadFile( cDir & curFile, lineArray ) 6a;v&5 For curLine = 2 To UBound(lineArray) vD 5vbl Print #1, lineArray(curLine) Q}S_%I}u: Next ^
wY[3"{ Next [`]4P& _|"Y]:j_ 'Close the output file b)9'bJRvU Close #1 )5|I_PXB C/(M"j M Print "Finished merging RPC data for sample " & sampName c)@>zto# Print "FRED formatted data file: " & Chr(9) & outFile S1/`th End Sub _ Ro!"YVX ho>k$s? 'Utility function to read the contents of a file into an array of strings. M-i_#EWP Function ReadFile(ByVal fileName As String, _ /m!Cc/Hv ByRef lineArray() As String) As Long iS5W>1] u*qV[y5Bl ReadFile = -1 0oEOre3^% Dim oFSO As Object 3s"0SLS4 Set oFSO = CreateObject("Scripting.FileSystemObject") "zIFxDR# Erase lineArray -{`@=U w`l{LHrR Dim fid As Long JWA@+u*k If oFSO.fileexists( fileName ) Then BL 3gKx.' fid = FreeFile() W+*5"h Open fileName For Input As fid M)sZSH.<O lineArray = Split(Input(LOF(fid), fid), vbCrLf) #z1H8CFL" Close fid sBV4)xM End If >a3p >2 Set oFSO = Nothing YDGS}~m~Q Return UBound( lineArray ) ={hX}"*D /O]t R End Function @y31NH( QJ|a p4r Sub GetFileList( ByVal in_dir As String, _ 4e;QiTj ByRef in_flist() As String ) S~]mWxgZ ;W>Y:NCrp 'Redimension the file list array G<M:Ak+~ Erase in_flist t'm;:J1 ^[15&T5 'Tracks how many files are found nNXgW Dim fCount As Long oA1a /[# fCount = 0 #M A4 vky .^ 'Recurse directory and search for text files fr!Pj(Q1 Dim f As String GJqE!I,. f = Dir$(in_dir & "*.txt") b~-%c_ While f <> "" xUfbW;;]UU ReDim Preserve in_flist(fCount) |pa$*/!NT in_flist(fCount) = f ["}rk fCount += 1 eSW{Cb f = Dir$() UU8pz{/ Wend ~n}k\s~|4 ReDim Preserve in_flist(fCount-1) O0>A+o[1F zS]8V?` End Sub t20PP4FWM $H$j-)\D /pp1~r.s?> QQ:2987619807 ;l$ \6T
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