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摘要: <a3XV !g:UM R 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。 4w[ta?&6B 4 l(o{{ 背景: :UciFIa 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。 <3CrCEPC 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。 je%12DM 图1. RPC Photonics工程漫射体结构及光束投射形状 1nmWL0 t$|6}BX aoX$,~oI5 步骤 6*Qpq7Ml (#`o>G( 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。 =c4U%d2 mg]dK p 图2. RPC Photonics工程漫射体不同类型的散射数据 (7
iMIY 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) HPB1d!^ 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 G8'3.;"W5 例如下所示: v$Z1Lh Sample name: EDF-C1-56 h^,a 1' Merging data from file EDF-C1-56 0-0.txt #YdU,y=B Finished merging RPC data for sample EDF-C1-56 | w -W=v FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt MG>;|*$% 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (%, ' a. 创建一个新的散射库 Yd'ke,Je b. 散射模型命名 y0]O 6.{ c. 改变散射模型为“Tabulated BSDF”. _A*0K,F- 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 ) 2ra4t]f6 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。 Nx'j+>bz>y 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, iL<O|' be g. 点击OK L4%LE/t|e 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^lj>v}4fkW cB^lSmu5 ^`THV 脚本代码: uyIA]OtyN M:E#}( '#Language "WWB-COM" <D}k@M
Z 5N0H^ Option Explicit M-hnBt `PfC:L Sub Main >{Djx 5B6:pH6e 'Cleanup L\I/2aiE ClearOutputWindow() !WXSrICX[ 2z:9^a/]Na Print "Merging RPC Photonics BSDF Data Files" X +R_TC SetTextColor(255,0,0) }dCnFZ{K3 Print "Note: Script should be located in the same folder as the BSDF TXT files." X*@Sj;|m Print "Note: Do not run this script multiple times without deleting the output file between executions." |>)mYLN!y SetTextColor(0,0,0) -L@=j }<p%PyM 'Current directory of this script (should be the same as the text files being merged) &CgD smJo# Dim cDir As String :M16ijkx cDir = MacroDir$ & "\" b.(^CYYQ I6+5 mv\ 'Array which will be populated with the list of files to be merged fqxMTTg@ Dim fList() As String, curFile As String kmwFw># GetFileList( cDir, fList ) nM#\4Q[}Jh lUmaNZ Print "" hdzaU&w Print "Files found for merging:" G8VWx&RE For Each curFile In fList 8}2
`^<U Print Chr(9) & curFile o'G")o Next Ex<0@Oz cVN|5Y 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. TD'1L:mv Dim nameArray() As String, sampName As String Em;zi.Y+V nameArray = Split(fList(0)," 0-0.txt") P$Nwf,d2u sampName = nameArray(0) V0>,Kxk Print "" 4?`7XJ0a Print "Sample name: " & Chr(9) & sampName q-'zZ# tP3Upw"U 'Open an output file and write the FRED header data raCxHY Dim outFile As String @L0.Z1 ). outFile = cDir & sampName & "_FRED.txt" %VgR * Open outFile For Output As #1 74_ji! Print #1, "type bsdf_data" B4%W,F:@ Print #1, "format angles=deg bsdf=value scale=1" ~_Aclm? YvonZ 'Loop the file list, skip the two header lines and write the remaining data to file ]*).3<Lw Dim lineArray() As String, curLine As Long !U@[lBW For Each curFile In fList sNWj+T Print "Merging data from file " & curFile 0=NB[eG ReadFile( cDir & curFile, lineArray ) IIzdCa{l For curLine = 2 To UBound(lineArray) z?7pn}- Print #1, lineArray(curLine) b$hQB090 Next @>?&Mw\c Next /) N[tv2 >5\rU[H> 'Close the output file
Re`= B Close #1 ne%ckW?ks ffd yDUzQ Print "Finished merging RPC data for sample " & sampName d:3G4g Print "FRED formatted data file: " & Chr(9) & outFile 7C=t19&R' End Sub Tw$la kw rxO|k0x^C 'Utility function to read the contents of a file into an array of strings. DF<_Ns! Function ReadFile(ByVal fileName As String, _ b1-JnEc ByRef lineArray() As String) As Long I_Q '+d Xcb\N ReadFile = -1 ,{$:Q}` Dim oFSO As Object US-P>yF Set oFSO = CreateObject("Scripting.FileSystemObject") p\Jz<dkN1 Erase lineArray mD tD7FzJ S>nM&758 Dim fid As Long AkGCIn3 If oFSO.fileexists( fileName ) Then {JMFCc[ fid = FreeFile() vtmvvv Open fileName For Input As fid ACs?m\$Q lineArray = Split(Input(LOF(fid), fid), vbCrLf) .hUndg Close fid u>}k+8~ End If m8.sHw Set oFSO = Nothing ^J?I-LG Return UBound( lineArray ) M%Ov6u<I8 c8A
// End Function qm2 uk16 Sub GetFileList( ByVal in_dir As String, _ 0GEK xV\F ByRef in_flist() As String ) A#*0mJ8IK lf&g *%?1 'Redimension the file list array in$Pk$ c Erase in_flist 72.ZE%Ue 42mdak}\ 'Tracks how many files are found `8EHhN; Dim fCount As Long Ga"t4[=I fCount = 0 jT%k{"+>+? L]cZPfI6 'Recurse directory and search for text files :beBiO Dim f As String zxY f = Dir$(in_dir & "*.txt") jU/0a=h9 While f <> "" O.Z<dy+ ReDim Preserve in_flist(fCount) 0@vSl%I+ in_flist(fCount) = f y]yp8Bs+ fCount += 1 WOiw 0 f = Dir$() 5\lOZYHX Wend zrri&QDF< ReDim Preserve in_flist(fCount-1) ^<Q+=\h (bY#!16C: End Sub I8rtta wS9EC}s:Q $ba3dqbCW QQ:2987619807 B/7c`V
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