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摘要: 6&Al9+$ 72;4 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。 h0v4!`PQ- a9<&|L < 背景: E/[<} ./ 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(<
Vk= 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。 oI/jGyY; 图1. RPC Photonics工程漫射体结构及光束投射形状 Ny
oRp P*M$^p nGvWlx 步骤 O,>`#? /`)>W : 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 aLKvl~s;m H7=[sL^ 图2. RPC Photonics工程漫射体不同类型的散射数据 qwz_.=5E6 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) vI)-Zz[3 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 \KpSYX1 例如下所示: EoOB0zo}Y+ Sample name: EDF-C1-56
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Merging data from file EDF-C1-56 0-0.txt a`:ag~op@& Finished merging RPC data for sample EDF-C1-56 U:[#n5g FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt _#2AdhCu 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 OB&lq.r a. 创建一个新的散射库 ED>T2.:{ b. 散射模型命名 ,*Vt53@E c. 改变散射模型为“Tabulated BSDF”. m:{ws~ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 8&0+Az"{O e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 '&<T;V% f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, Fo0dz g. 点击OK >#jfZ5t 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4jyDM68i q_sQC5:s #UO#kC<2(B 脚本代码: ~SWR|[ |D
?}6z '#Language "WWB-COM" n%"0%A BRu/pyxG Option Explicit h9B^U?<wT RkW)B^# Sub Main /<\B8^yQ in/ITy- 'Cleanup ,2I8,MOg ClearOutputWindow() 13X0LN Ki"o0u Print "Merging RPC Photonics BSDF Data Files" q')MKR* SetTextColor(255,0,0) z
5T_ Print "Note: Script should be located in the same folder as the BSDF TXT files." X9d~r_2&m< Print "Note: Do not run this script multiple times without deleting the output file between executions." I`O)I&KH SetTextColor(0,0,0) DV,rh83.ip cc"L> XoK 'Current directory of this script (should be the same as the text files being merged) pu"`*NL Dim cDir As String ?\eq!bu cDir = MacroDir$ & "\" w=r3QKm#K D m|_;iO, 'Array which will be populated with the list of files to be merged ]B;\?Tim Dim fList() As String, curFile As String g7-=kmr|V GetFileList( cDir, fList ) mM&*_#(
6 @L)=epC Print "" !E0zj9 [ R Print "Files found for merging:" $h({x~Oj9 For Each curFile In fList RnA>oKc Print Chr(9) & curFile cP4K9:k Next FzDZ<dJ J:{$\m' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. cvf@B_iN9 Dim nameArray() As String, sampName As String u)DhkF| nameArray = Split(fList(0)," 0-0.txt") |kUxTe sampName = nameArray(0) A=v^`a03I Print "" KvFGwq"X Print "Sample name: " & Chr(9) & sampName ;U
+;NsCH LOD'iiH6 'Open an output file and write the FRED header data x}w"2[fL Dim outFile As String D~;hIt* outFile = cDir & sampName & "_FRED.txt" Pmj]"7Vd[ Open outFile For Output As #1 2hjR'6h"Y Print #1, "type bsdf_data" P&ig.Og* Print #1, "format angles=deg bsdf=value scale=1" ed,w-;(n~ gZ5E%']sT 'Loop the file list, skip the two header lines and write the remaining data to file [I`r[u Dim lineArray() As String, curLine As Long ,@_$acm For Each curFile In fList S_z}h Print "Merging data from file " & curFile ,C#Mf@b ReadFile( cDir & curFile, lineArray ) Bh9O<|E For curLine = 2 To UBound(lineArray) yAu-BObD Print #1, lineArray(curLine) hLVS}HE2 Next M NE{mV( Next zS@"ITy 6z^Kg~a 'Close the output file Yfk){1 Close #1 c
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8> FBjIft5e Print "Finished merging RPC data for sample " & sampName +DWmutL Print "FRED formatted data file: " & Chr(9) & outFile 6\MJvg\; End Sub Y *
#'Gh, Pez 7HKW: 'Utility function to read the contents of a file into an array of strings. C-;y#a) Function ReadFile(ByVal fileName As String, _ TJ:B_F*bSk ByRef lineArray() As String) As Long >H@
zP8 (c/H$' ReadFile = -1 &S}i)Nu6J Dim oFSO As Object hcw)qB,s Set oFSO = CreateObject("Scripting.FileSystemObject")
uC3o@qGW< Erase lineArray }w \["r Dt~Jx\\ Dim fid As Long G`9\v=0 If oFSO.fileexists( fileName ) Then :*bmc /c fid = FreeFile() a pxZ} Open fileName For Input As fid y.AF90Q>) lineArray = Split(Input(LOF(fid), fid), vbCrLf) YfC1.8 Close fid tylMJ$ 9*. End If la ~T)U7 Set oFSO = Nothing x1m J&D Return UBound( lineArray ) ubV|s|J tJ>OZ End Function 8K!
l X d}K"dr:W5 Sub GetFileList( ByVal in_dir As String, _ DiK@>$v ByRef in_flist() As String ) r\y~
: |x|#n 'Redimension the file list array vUGEzC M Erase in_flist 3~"G(UP DLYk#d: q? 'Tracks how many files are found ~X^L3=!vf Dim fCount As Long tT}*%A fCount = 0 esH>NH_ .6%-Il 'Recurse directory and search for text files O:fv1 Dim f As String =`5Xx( f = Dir$(in_dir & "*.txt") :CO>g=` While f <> "" {g?$u ReDim Preserve in_flist(fCount) +'abAST
t in_flist(fCount) = f 4P@Ak7iL(V fCount += 1 &?mH[rG" f = Dir$() \|Pp%U [ Wend 5qkG~YO- ReDim Preserve in_flist(fCount-1) }EmNSs`$r UY*3b<F} End Sub 6[kp#
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