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摘要: EmP2r*"rb Xe/7rhov 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。 c No)LF <bv9X?U 背景: vl%Pg!l 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。 .:;q8FL/ 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。 ;lTgihW- 图1. RPC Photonics工程漫射体结构及光束投射形状 waV4~BdL T z+Y_ }_Sgor83n 步骤 L`^v"W() )s 1
Ei9J 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。 =E~SaT ^'sOWIzeiY 图2. RPC Photonics工程漫射体不同类型的散射数据 W$" >\A0% 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) JvW!w)$pY 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 8Waic&lX~ 例如下所示: xxdxRy9/ Sample name: EDF-C1-56 dUceZmAl Merging data from file EDF-C1-56 0-0.txt 2b#>~ Finished merging RPC data for sample EDF-C1-56 %=v<3 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (%M:=zm 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 gp{P _ a. 创建一个新的散射库 R ta_\Aj! b. 散射模型命名 #M[Cq= 2 c. 改变散射模型为“Tabulated BSDF”. $:D hK d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) rIH+X2x e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 uC`)?f*I f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, G&0JK ,Y g. 点击OK hA"z0Fszh 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KR4 RIJZ_t (W`=`]! D4GXZX8K 脚本代码: !{oP'8Ax$ ?[O Sy.6 '#Language "WWB-COM" kca Y pQ+4++7ID Option Explicit $4TawFf"nc v|>'m#Ln2 Sub Main cFG%Ew@ |G-o&m" 'Cleanup RK=YFE 0 ClearOutputWindow() *:,7
A9LY LZ~$=< Print "Merging RPC Photonics BSDF Data Files" 1FC1*7A[ SetTextColor(255,0,0) C
F< Print "Note: Script should be located in the same folder as the BSDF TXT files." 9D mQ Print "Note: Do not run this script multiple times without deleting the output file between executions." ( KG>lTdN SetTextColor(0,0,0) DfP
vi1 !O8vr4= 'Current directory of this script (should be the same as the text files being merged) noNL.%I Dim cDir As String .gHL(*1P cDir = MacroDir$ & "\" Ibl==Irk uI[lrMQYa 'Array which will be populated with the list of files to be merged -U_<: Dim fList() As String, curFile As String 8DNGqaH;dt GetFileList( cDir, fList ) $yg}HS7HC 1Xu^pc Print "" ;tLu Print "Files found for merging:" C{):jH,Rf For Each curFile In fList Q1@V?`rkS{ Print Chr(9) & curFile r`/tb^ Next "Mmvf'N rru `%~'O 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. I"+;L4o ` Dim nameArray() As String, sampName As String CpICb9w nameArray = Split(fList(0)," 0-0.txt") =Wk!mGc sampName = nameArray(0) 2myHn/%C Print "" pfvNVu Print "Sample name: " & Chr(9) & sampName $
V"7UA22 QFf lx 'Open an output file and write the FRED header data Y1vSwS%{T Dim outFile As String PDssEb7 outFile = cDir & sampName & "_FRED.txt" a|@^N Open outFile For Output As #1 G%K<YyAP Print #1, "type bsdf_data" nPUq+cXy]C Print #1, "format angles=deg bsdf=value scale=1" Jk7[}Jc$
Eyu?T 'Loop the file list, skip the two header lines and write the remaining data to file vrIM!~*W Dim lineArray() As String, curLine As Long eESJk14 For Each curFile In fList P
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]L Print "Merging data from file " & curFile a4! AvG ReadFile( cDir & curFile, lineArray ) n2H2G_-L[ For curLine = 2 To UBound(lineArray) {N$G|bm]u< Print #1, lineArray(curLine) ]7^YPFc+ Next 2FS,B\d Next S<LHNZu|^A c;bp[Y3R 'Close the output file l>M&S^/s j Close #1 =`rESb[ Aj4i}pT Print "Finished merging RPC data for sample " & sampName _>*$%R Print "FRED formatted data file: " & Chr(9) & outFile "ND 7,rQ End Sub (byFr9z @hWt.qO3s 'Utility function to read the contents of a file into an array of strings. dYJW`Q;j.| Function ReadFile(ByVal fileName As String, _ "Gxf[6B ByRef lineArray() As String) As Long Ydu=Jg5u7 O.*, e ReadFile = -1 W 6~B~L Dim oFSO As Object @&d/}Mx"t Set oFSO = CreateObject("Scripting.FileSystemObject") !T|X/BR Erase lineArray ?!-2G [N925?--S Dim fid As Long -q\1Tlc]3 If oFSO.fileexists( fileName ) Then )fR'1_ fid = FreeFile() z&d&Ky Open fileName For Input As fid 0*8[m+j1 lineArray = Split(Input(LOF(fid), fid), vbCrLf) dM 7-,9Vc Close fid (_E<? End If 1<
;<? Set oFSO = Nothing 6546"sU Return UBound( lineArray ) T.aY{Y -pc*$oe End Function %Sfew/"R0 BfIGw Sub GetFileList( ByVal in_dir As String, _ 4S@^ym ByRef in_flist() As String ) +X0?bVT !["WnF{5eC 'Redimension the file list array {v56k8uZ Erase in_flist xO6)lVd m
Fwx},dl 'Tracks how many files are found b4s.`%U Dim fCount As Long 9#.nNv*z3 fCount = 0 ep Eg6
F\Ex$:%~ 'Recurse directory and search for text files >ZuWsA0q Dim f As String N%:QaCZKw f = Dir$(in_dir & "*.txt") u-At k-2M While f <> "" Y_)!U`>N? ReDim Preserve in_flist(fCount) k 0z2)3L in_flist(fCount) = f !,PG!Gnl fCount += 1 y'pAhdF f = Dir$() p0UR5A>p Wend -Yy,L%E]F: ReDim Preserve in_flist(fCount-1) @%fNB,H` diGPTV-?$ End Sub (5re'Pl Pp6(7j o4,W!^n2 QQ:2987619807 B{lBUv(B
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