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摘要: o{wXq)b A('_.J= 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。 rq>OmMQ67 *wetPt)~v_ 背景: C [h^bBq 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。 SH${ \BKup FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 V[N4 {c 图1. RPC Photonics工程漫射体结构及光束投射形状 lwuslt*E/ L
2:N @TP |ydOi& 步骤 z4yV1 -^%YrWgd? 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 17{$D,P ($ l
t@j 图2. RPC Photonics工程漫射体不同类型的散射数据 NN;'QiE 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) #+,O 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 zgh~P^Z 例如下所示: ;_vo2zl1 Sample name: EDF-C1-56 *(sUz?t Merging data from file EDF-C1-56 0-0.txt f~NGIlgR Finished merging RPC data for sample EDF-C1-56 4]$$ar) FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6$|!_94>*) 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 X}s}E
;v9 a. 创建一个新的散射库 pZv>{=2hOS b. 散射模型命名 +Y c. 改变散射模型为“Tabulated BSDF”. n!K<g.tjW d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) S=bdue e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 $rG~0 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, {KO+t7'Q g. 点击OK ') -Rv]xe 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~Uz1()ftz t$W~X~// ^cy.iolt 脚本代码: w0FkKJV 9M&uQccY '#Language "WWB-COM" dUg| {l 4pfv?!Oj Option Explicit 6-\ghPo /Ky xOb) Sub Main |tkhsQ-; jZ8#86/#{ 'Cleanup 17nONhh ClearOutputWindow() mSu1/?PS lrXi*u] Print "Merging RPC Photonics BSDF Data Files" &>.
w* SetTextColor(255,0,0) k5%:L2FO Print "Note: Script should be located in the same folder as the BSDF TXT files." ZV;lr Vv Print "Note: Do not run this script multiple times without deleting the output file between executions." c5t],P SetTextColor(0,0,0) C=z7Gk= yA/b7x-c 'Current directory of this script (should be the same as the text files being merged) '&.QW$B\B_ Dim cDir As String U[Pll~m2b cDir = MacroDir$ & "\" LmKG6>Q1#1 8"\g?/ 'Array which will be populated with the list of files to be merged ZKv^q%92 Dim fList() As String, curFile As String LS=HX~5C GetFileList( cDir, fList ) smM*HDK D/$$"AT Print "" D6KYkN(,v Print "Files found for merging:" SbLx`]rI For Each curFile In fList -R[ *S " Print Chr(9) & curFile !\0UEC Next _p~lL<q-K[ jJN.( 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Q599@5aS Dim nameArray() As String, sampName As String )K4A-9pC nameArray = Split(fList(0)," 0-0.txt") @} 61D sampName = nameArray(0) XkWO -L Print "" .5',w"R Print "Sample name: " & Chr(9) & sampName ib4 shaN` ~
cKmf] 'Open an output file and write the FRED header data <3wfY
#;>< Dim outFile As String 26c,hPIeXY outFile = cDir & sampName & "_FRED.txt" wX_s./#JJ Open outFile For Output As #1 ccUq!1 Print #1, "type bsdf_data" w!0`JPu Print #1, "format angles=deg bsdf=value scale=1" Wgt[ACioN HbRDa 'Loop the file list, skip the two header lines and write the remaining data to file !z
!R)6 Dim lineArray() As String, curLine As Long +w
;2k w For Each curFile In fList cMCGaaLU Print "Merging data from file " & curFile &ggS!y'n ReadFile( cDir & curFile, lineArray ) J!$q"0G'WT For curLine = 2 To UBound(lineArray) XNwZSW Print #1, lineArray(curLine) gg>O:np8 Next t,*hxzD" Next f_*Bd.@ ~Bll\3-= 'Close the output file ohFUy}y Close #1 ~bp^Q|
wM JsfX&dX0 Print "Finished merging RPC data for sample " & sampName $"d< F3k Print "FRED formatted data file: " & Chr(9) & outFile l .8@F End Sub RJ ,a}w[9 n+Ia@$|m 'Utility function to read the contents of a file into an array of strings. zj ;'0Zu Function ReadFile(ByVal fileName As String, _ ]ov>VF,< ByRef lineArray() As String) As Long Le&SN7I :27GqY,3sK ReadFile = -1 j4v.8; Dim oFSO As Object ,)u\G(N Set oFSO = CreateObject("Scripting.FileSystemObject") 1 m)WM,L Erase lineArray lKo07s6u prf Dim fid As Long ;(cqaB If oFSO.fileexists( fileName ) Then eIEr\X4\~~ fid = FreeFile() xn49[T
Open fileName For Input As fid yF&"'L lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1(z&0Y ; Close fid i%m]<yElm End If }<y-`WB Set oFSO = Nothing N? r{Y$x Return UBound( lineArray ) Mqu>#lL '.jr" 3u End Function 6I0G.N :"Vfn:Q Sub GetFileList( ByVal in_dir As String, _ `Pa)H ByRef in_flist() As String ) N=e-"8 E1(2wJ-3" 'Redimension the file list array =Ri'Prx& Erase in_flist p<5ED\;N; ][b_l(r$? 'Tracks how many files are found B3Id}[V Dim fCount As Long V=)0{7-9 fCount = 0 %d<uOCf\Q R5i v]8X4W 'Recurse directory and search for text files %E\&9, Dim f As String N# o" W f = Dir$(in_dir & "*.txt") 1Ner1EKGp While f <> "" `Zn2Vx ReDim Preserve in_flist(fCount) {ZiZ$itf in_flist(fCount) = f )<w`E{q fCount += 1 3z^l f = Dir$() ?]i.Zi\[f Wend ~&>|u5C*@ ReDim Preserve in_flist(fCount-1) f9A^0A?c 9,h'cf`F End Sub y H\z+A|
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