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摘要:
[7bY( 3]'3{@{}H 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。 XP'KgTF -Jhf] 背景: I
?1E}bv 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。 gVGq 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。 #\}hN~@F 图1. RPC Photonics工程漫射体结构及光束投射形状 PSRGlxdO -$7Jc=:> @wo9;DW` 步骤 <C&UDj yHCc@`1. 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 !MbRI '
|4XyU= 图2. RPC Photonics工程漫射体不同类型的散射数据 \ .:CL?m# 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 9DIG K\ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 r
)T`?y 例如下所示: 3yTBkFI! Sample name: EDF-C1-56 j1BYSfX' Merging data from file EDF-C1-56 0-0.txt zmdOL9"a
Finished merging RPC data for sample EDF-C1-56 ? f%@8%px FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt <a'j8pw9i 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cJt#8P
a. 创建一个新的散射库 ag3T[}L
z b. 散射模型命名 X3nwA#If1 c. 改变散射模型为“Tabulated BSDF”. -/h$Yb 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 ) DU;]Q:r{ 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。 $lO\eQGxB f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Y$(G)Fs g. 点击OK Va1|XQ<CL 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "MyYu}AD C ZJW`c/ dZZHk 脚本代码: j*CnnM#n L|c01 '#Language "WWB-COM" 6ds&n#n cM55
vVd Option Explicit .9`.\v6R Lg'z%pi Sub Main 7Q^t( g
>X!Q 'Cleanup EB)0 iQ ClearOutputWindow() f5'+F-`N b+w|3bQa Print "Merging RPC Photonics BSDF Data Files" tf>?; SetTextColor(255,0,0) aa$+( Print "Note: Script should be located in the same folder as the BSDF TXT files." ]Fa VKC~3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 9D&ocV3QV SetTextColor(0,0,0) |`,%%p|T% Rrs z{a
'Current directory of this script (should be the same as the text files being merged) k+_pj k Dim cDir As String T;I a;<mfE cDir = MacroDir$ & "\" q'PA2a: vRm;H|[%S 'Array which will be populated with the list of files to be merged O%rjY Dim fList() As String, curFile As String X.g1
312~ GetFileList( cDir, fList ) 4O2O0\o: L>cTI2NB. Print "" ZU/6#pb Print "Files found for merging:" YrA#NTB_o For Each curFile In fList y+@7k3" Print Chr(9) & curFile iQ:]1H s Next =EFF2M`F &g|-3)A 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 'r3I/qg*m Dim nameArray() As String, sampName As String o ;.j_ nameArray = Split(fList(0)," 0-0.txt") gR%fv sampName = nameArray(0) )~rN{W<s`H Print "" k|1/gd5 Print "Sample name: " & Chr(9) & sampName mL ]zkD_ ga VWfG 'Open an output file and write the FRED header data 9=Y-w s Dim outFile As String }VdohX- outFile = cDir & sampName & "_FRED.txt" tZwZZ0]Z Open outFile For Output As #1 `5Q0U%`W Print #1, "type bsdf_data" vTN$SgzfCU Print #1, "format angles=deg bsdf=value scale=1" UZ v^3_,qz nCJ)=P.d 'Loop the file list, skip the two header lines and write the remaining data to file ,{7Z OzA Dim lineArray() As String, curLine As Long v-EcJj% For Each curFile In fList Ee d2`~ Print "Merging data from file " & curFile JuS#p5E # ReadFile( cDir & curFile, lineArray ) cV=h8F For curLine = 2 To UBound(lineArray) E\ 5t&jZr Print #1, lineArray(curLine) d_]zX;_ Next *e!0ZB3J Next 2{% U\^- Q"S;r1 D 'Close the output file *ax$R6a#X Close #1 hr(E,TAe Z-.`JkKd8 Print "Finished merging RPC data for sample " & sampName GeD^-.^ Print "FRED formatted data file: " & Chr(9) & outFile 8:TN,p End Sub V`m'r+ Y N\BB8<F 'Utility function to read the contents of a file into an array of strings. <x *.M"6? Function ReadFile(ByVal fileName As String, _ UW_fn ByRef lineArray() As String) As Long ZG"_M@S. fKb8)PDP ReadFile = -1 n3-5`Jti Dim oFSO As Object M<4~ewWJ Set oFSO = CreateObject("Scripting.FileSystemObject") y}Oc^Fc Erase lineArray ?I6 !m~ V'K1kYb Dim fid As Long .Ce30VE- If oFSO.fileexists( fileName ) Then CI{? Kb fid = FreeFile() #41~`vq3 Open fileName For Input As fid S=@.<gS lineArray = Split(Input(LOF(fid), fid), vbCrLf) 8m\*~IX= Close fid Y92wL} End If Mj|\LF + Set oFSO = Nothing "AMbU68 Return UBound( lineArray ) pX `BDYg. SvLI%>B=9 End Function $F"'=+0 Nr8#/H2f Sub GetFileList( ByVal in_dir As String, _ SfLZVB ByRef in_flist() As String ) T{<riJ`O :c)N"EJlI2 'Redimension the file list array XEl-5-M" Erase in_flist 3|x*lmit wc`UcGO 'Tracks how many files are found xkV(E!O Dim fCount As Long lA>^k;+> fCount = 0 p8,Rr{ %/iD@2r 'Recurse directory and search for text files f9ux+XQk9 Dim f As String iq*]CF f = Dir$(in_dir & "*.txt") WR,MqM20 While f <> "" |C"(K-do ReDim Preserve in_flist(fCount) (dmLEt in_flist(fCount) = f &y_Ya%Z3*e fCount += 1 "sh*,K5x| f = Dir$() `Y]t*`
e| Wend AQ+MjS, ReDim Preserve in_flist(fCount-1) AUjZYp ;+C2P@M End Sub )S"!)\4 b
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