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摘要: 3Y$GsN4ln s~X%Y<9l 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。 `ERz\`d~Y; tCt#%7J;a 背景: <a3WKw 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。 5{,<j\#L 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。 H Pz+Dm 图1. RPC Photonics工程漫射体结构及光束投射形状 !4+<<(B=E RViAwTvY v]UwJz3< 步骤 |[8Th4*n `R^g U]Z, 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。 $F.a><1rY Q"#J6@ 图2. RPC Photonics工程漫射体不同类型的散射数据 } Q+|W=2t 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) C0Z=~Q% 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 q)
KKvO 例如下所示: JucY[`|JV Sample name: EDF-C1-56 _Fg5A7or Merging data from file EDF-C1-56 0-0.txt aN3;`~{9 Finished merging RPC data for sample EDF-C1-56 Aos+dP5h,8 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt owv[M6lbD 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,V}WM%Km a. 创建一个新的散射库 lyhiFkO
iH b. 散射模型命名 WNc0W>*NE1 c. 改变散射模型为“Tabulated BSDF”. a 1*p*dM# d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) oXgcc*j e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 6Kz,{F@ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, uyx 2;f g. 点击OK [Ch.cE_ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 G3v5KmT X@FN|Rdh Ax}JLPz5' 脚本代码: \fe]c : Flb&B1 '#Language "WWB-COM" aw> #P Dvln/SBk Option Explicit &)<)^.@3G^ Cgc\
ah Sub Main 93hxSRw PPsE${! 'Cleanup poFg1 ClearOutputWindow() -s/ea~=R e96k{C`j0 Print "Merging RPC Photonics BSDF Data Files" #X"@<l4F SetTextColor(255,0,0) Xn
;AZu^'R Print "Note: Script should be located in the same folder as the BSDF TXT files." kU`r)=1" Print "Note: Do not run this script multiple times without deleting the output file between executions." 8dhUBJ0_ SetTextColor(0,0,0) .N(p=9 $ME)#( 'Current directory of this script (should be the same as the text files being merged) a'IdYW0 Dim cDir As String U/BR*Zn]* cDir = MacroDir$ & "\" 9nbLg5P T[j,UkgGo 'Array which will be populated with the list of files to be merged #$y?v%^ Dim fList() As String, curFile As String ehY5!D1Q GetFileList( cDir, fList ) vfo~27T{( {l>hMxij Print "" 8~gLqh8^V Print "Files found for merging:" A5w6]: f2 For Each curFile In fList 0ZO2#>gh$ Print Chr(9) & curFile v.5+7,4 Next 1-QS~)+ |^H5^k "Bv 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. g=o4Q<
#^y Dim nameArray() As String, sampName As String ;9g2?-svw
nameArray = Split(fList(0)," 0-0.txt") >F&47Yn sampName = nameArray(0) o _H`o&xr Print "" "
2Dngw Print "Sample name: " & Chr(9) & sampName 0SPk|kr N}YkMJy 'Open an output file and write the FRED header data Xn\jO>[Ef Dim outFile As String G*v,GR outFile = cDir & sampName & "_FRED.txt" jF*j0PkNdb Open outFile For Output As #1 lb1Xsgm{ Print #1, "type bsdf_data" 1ZRT:N<- Print #1, "format angles=deg bsdf=value scale=1" dC4'{n|7 Ecx<OTo 'Loop the file list, skip the two header lines and write the remaining data to file >-{Hyx Dim lineArray() As String, curLine As Long @xZR9Z8]L For Each curFile In fList /H+a0`/ Print "Merging data from file " & curFile PnG-h~Y3N ReadFile( cDir & curFile, lineArray ) 61
~upQaR For curLine = 2 To UBound(lineArray) n{SJ_S#a.a Print #1, lineArray(curLine) 76` .Y Next dAe')N:KPI Next !5?<% * z&^&K} 'Close the output file T9q-,w/j; Close #1 KCDE{za W+1^4::+ Print "Finished merging RPC data for sample " & sampName lB[kbJ Print "FRED formatted data file: " & Chr(9) & outFile .w,q0<} End Sub /|&*QLy :p6M= 'Utility function to read the contents of a file into an array of strings. '$QB$2~V Function ReadFile(ByVal fileName As String, _ Oz#{S:24M+ ByRef lineArray() As String) As Long wn)W
?P;k !$>R j ReadFile = -1 xi;`ecqS< Dim oFSO As Object HLHz2-lI Set oFSO = CreateObject("Scripting.FileSystemObject") $xdy& Erase lineArray _t}WsEQ+P rk)`\=No Dim fid As Long ~.lPEA %% If oFSO.fileexists( fileName ) Then vgN&K@hJ fid = FreeFile() $7A8/# Open fileName For Input As fid eGbGw lineArray = Split(Input(LOF(fid), fid), vbCrLf) m<2M4u Close fid :S(ZzY
Q End If 5.J.RE"M Set oFSO = Nothing jOD?|tK& Return UBound( lineArray ) "Os_vlapHo -+-_I*( End Function yJe>JK~) dN[\xVcj Sub GetFileList( ByVal in_dir As String, _ >~+ELVB& ByRef in_flist() As String ) % +\."eC Yk Qd
'Redimension the file list array -1ub^feJ, Erase in_flist 57'4ljvYi sds"%]rg 'Tracks how many files are found IRqy%@) Dim fCount As Long PRE|+=w$ fCount = 0 &~U ] ~;@ G'aDb/ 'Recurse directory and search for text files 1D!<'`)AY Dim f As String ^\,E&=/}M f = Dir$(in_dir & "*.txt") 2Q:+_v While f <> "" -!]ZMi9 ReDim Preserve in_flist(fCount) gt w Q- in_flist(fCount) = f ,UdVNA fCount += 1 WQO) =n f = Dir$() K8Y=S12Ti Wend 2P{Gxz<# ReDim Preserve in_flist(fCount-1) "|KP'<8% i,9)\1R End Sub P\)iZiGc ijx0gh`~ 6<(.4a? QQ:2987619807 :tv,]05t
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