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摘要: TJGKQyG$L ,:Y=,[ n RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 k3htHCf*G$ V1+o3g{} 背景: W} +6L| 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。 0aq-drl5\ 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。 g5TLX&Bd 图1. RPC Photonics工程漫射体结构及光束投射形状 5;KT-(q~ }X.8.S' 7$!Bq# 步骤 c=c.p
i"s I]S(tx! 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 jzOMjz~:) ;U:o'9^9T 图2. RPC Photonics工程漫射体不同类型的散射数据 :ftyNaq' 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) qcoZ2VJ hh 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 &wWGZ~T 例如下所示:
fVe-esAw Sample name: EDF-C1-56 =P+wp{?AN| Merging data from file EDF-C1-56 0-0.txt dIh(~KqB Finished merging RPC data for sample EDF-C1-56 N7|W.( FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 74!JPOpQH 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 sT8kVN|Uv a. 创建一个新的散射库 'bqf?3W b. 散射模型命名 Q?'W >^*J c. 改变散射模型为“Tabulated BSDF”. <PA$hTYM 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 ) _:z;j{@4 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。 :.o0< 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, o~z.7q g. 点击OK }t{^*( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ViC76aJ :zk.^q O9 r44ww 脚本代码: J'&?=| m`w6wz '#Language "WWB-COM" /? <9,7#i =:T:9Y_ i Option Explicit Wh&Z *J tj Bv{ Sub Main #B{F{,vlu, 7PPsEU:rf 'Cleanup $TUC?e9"h ClearOutputWindow() W;j)ux7jMY bJu,R-f Print "Merging RPC Photonics BSDF Data Files" RB
0j!H: SetTextColor(255,0,0) Ts *'f Print "Note: Script should be located in the same folder as the BSDF TXT files." p5 PON0dS Print "Note: Do not run this script multiple times without deleting the output file between executions." p~y
4q4 SetTextColor(0,0,0) A^jm<~ +mel0ZStS 'Current directory of this script (should be the same as the text files being merged) )"Yah Dim cDir As String D.JVEKLkU cDir = MacroDir$ & "\" H0:6zSsc=| 2/NWWoKw 'Array which will be populated with the list of files to be merged gnK!"!nL Dim fList() As String, curFile As String v*p)"J * GetFileList( cDir, fList ) ;5S7_p2]j =
ft$j Print "" -&^( T Print "Files found for merging:" tg4&j$ For Each curFile In fList E<_6OCz Print Chr(9) & curFile w'j]Y% Next W..>Ny;'3 P =Gb 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. }Qu
7o Dim nameArray() As String, sampName As String MA QY/s~F nameArray = Split(fList(0)," 0-0.txt") {?_)m/\ sampName = nameArray(0) J*k=|+[ Print "" Icb;Yzt Print "Sample name: " & Chr(9) & sampName T"lqPbK X'p%$HsMG 'Open an output file and write the FRED header data M0\[hps~X Dim outFile As String ;qQzF outFile = cDir & sampName & "_FRED.txt" %}MM+1eu Open outFile For Output As #1 %zVv3p: Print #1, "type bsdf_data" yr DYw T Print #1, "format angles=deg bsdf=value scale=1" 1Vvx@1 4&WzGnK 'Loop the file list, skip the two header lines and write the remaining data to file }tq9 /\ Dim lineArray() As String, curLine As Long OF}_RGKg3 For Each curFile In fList :jCaDhK Print "Merging data from file " & curFile ;0{*V5A ReadFile( cDir & curFile, lineArray ) vUExS Z^ For curLine = 2 To UBound(lineArray) JH,+F Print #1, lineArray(curLine) Y)5}bmL Next V,,iKr@TG Next H*<dte< \Fjq|3`<l 'Close the output file 09i[2n;O Close #1 NX/)Z&Fx: 7]53GGNO Print "Finished merging RPC data for sample " & sampName %^A++Z$` Print "FRED formatted data file: " & Chr(9) & outFile ~Dh}E9E: End Sub nr6U>
KR^ $*> _0{< 'Utility function to read the contents of a file into an array of strings. xrd^vE Function ReadFile(ByVal fileName As String, _ [#H8Mb+7 ByRef lineArray() As String) As Long eu/Sp3@v A>S2BL#= ReadFile = -1 b&&'b) Dim oFSO As Object $RO=r90o Set oFSO = CreateObject("Scripting.FileSystemObject") 6f1Y:qK'@ Erase lineArray cViCWc2 WVFy Zp B Dim fid As Long A}O9e If oFSO.fileexists( fileName ) Then <Z_`^~! fid = FreeFile() 4\iQ%fb Open fileName For Input As fid H2-( lineArray = Split(Input(LOF(fid), fid), vbCrLf) kv2:rmv Close fid o$;x[US End If P40eK0e6 Set oFSO = Nothing <ZEll[0L Return UBound( lineArray ) M1\/ueOe 21Opx~T3 End Function v.J#d>tvf T9yW# . Sub GetFileList( ByVal in_dir As String, _ =$J2 ByRef in_flist() As String ) y+<HS]vyV 4T-AWk 'Redimension the file list array oyY,uB.| Erase in_flist %hh8\5l.: $Vh82Id^ 'Tracks how many files are found L"0L_G Dim fCount As Long z9ZAY!Zhq] fCount = 0 jHzb,& stScz#! 'Recurse directory and search for text files ~b/>TKn+ Dim f As String c{q`uI;O f = Dir$(in_dir & "*.txt") wXnt3)e While f <> "" ~heF0C_ ReDim Preserve in_flist(fCount) ~1oD7=WN in_flist(fCount) = f =T`-h"E~@ fCount += 1 jXQ_7 f = Dir$() u ""=9>0 Wend 0v?,:]A0E ReDim Preserve in_flist(fCount-1) ?aui q J0k~% End Sub [z9i v~ ~%ZO8X:^ xUUp?]9y QQ:2987619807 5s9~rm
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