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摘要: HRDpFMA/~ RE%f'y 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。 k<^M >` $ R5 4[U 背景: e:9EP, 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。 qVE0[ve 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。 4Qfsxg 图1. RPC Photonics工程漫射体结构及光束投射形状 f=R+]XPzz E3wL n/< 3 J04 $cD 步骤 `<X-3)>;G ~&73f7 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。 bhpku=ov $?0ch15/ 图2. RPC Photonics工程漫射体不同类型的散射数据 UDg's 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) chE!,gik 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Kg$RT?q-C6 例如下所示: =L" 0]4K Sample name: EDF-C1-56 p1Zb&:+ Merging data from file EDF-C1-56 0-0.txt S v>6:y9?G Finished merging RPC data for sample EDF-C1-56 P6 OnE18n FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt U+)p'%f; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ==5F[UX a. 创建一个新的散射库 *n? 1C"l b. 散射模型命名 \@:,A] c. 改变散射模型为“Tabulated BSDF”. cj8cV|8@ 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 ) 1jl!VU6 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。 p%"dYH%]&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, fo@^=-4A- g. 点击OK S 13cQ?4 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @%R<3!3v A]/o-S_ /8h=6" 脚本代码: "n!yK cqNK`3:.j '#Language "WWB-COM" c0@8KW[, ~.m<`~u Option Explicit m.e]tTe 6gg8h>b Sub Main AC)
M2; q!5:M\ 'Cleanup I#M3cI!X? ClearOutputWindow() >d 2Fa4u3 @LKQ-<dZG Print "Merging RPC Photonics BSDF Data Files" yLX $SR SetTextColor(255,0,0) EiW|+@1 Print "Note: Script should be located in the same folder as the BSDF TXT files." )|F|\6:ne Print "Note: Do not run this script multiple times without deleting the output file between executions." bV_nYpo SetTextColor(0,0,0) #.bW9j/ #&&T1;z"# 'Current directory of this script (should be the same as the text files being merged) Ma[EgG Dim cDir As String p~qe/ cDir = MacroDir$ & "\" _IDZ.\'>$ 6Xlzdt 'Array which will be populated with the list of files to be merged 9t"Rw ns Dim fList() As String, curFile As String V8?}I)#(7 GetFileList( cDir, fList ) NI >%v RdTM5ANT Print "" a:h<M^n049 Print "Files found for merging:" *gbK
:*_J For Each curFile In fList >gk_klLh Print Chr(9) & curFile :gh[BeqQ) Next e3?=1ZB ETe4I`d{ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. y>^^. Dim nameArray() As String, sampName As String Ey46JO" nameArray = Split(fList(0)," 0-0.txt") d8j1L/e sampName = nameArray(0) _kj]vbG^; Print "" >H2`4]4] Print "Sample name: " & Chr(9) & sampName T~TP }h5i Tc 'Open an output file and write the FRED header data ~C.*Vc?| Dim outFile As String @;Ttdwg#J outFile = cDir & sampName & "_FRED.txt" K}VCFV Open outFile For Output As #1 xt{'Be&Ya+ Print #1, "type bsdf_data" Ccf/hA#mb Print #1, "format angles=deg bsdf=value scale=1" tli.g bLgH3[{ 'Loop the file list, skip the two header lines and write the remaining data to file wbO6Ag@)) Dim lineArray() As String, curLine As Long a V3:{oL For Each curFile In fList J3K=z Print "Merging data from file " & curFile hvd}l8 ReadFile( cDir & curFile, lineArray ) U2oCSo5:3N For curLine = 2 To UBound(lineArray) 5,RUPaE Print #1, lineArray(curLine) ^u/%zL Next |y\Km Next mo0\t#jA %\As 'Close the output file pm&THd Close #1 lo1Ui`V }{aGh I~< Print "Finished merging RPC data for sample " & sampName h~MV=7
lE Print "FRED formatted data file: " & Chr(9) & outFile ${+u-Wfau End Sub .1x04Np! ])x1MmRg\ 'Utility function to read the contents of a file into an array of strings. n\#YGL<n Function ReadFile(ByVal fileName As String, _ fCl}eXg6w ByRef lineArray() As String) As Long )*|/5wW1 Q=\
Oa(I ReadFile = -1 c}x1-d8 Dim oFSO As Object G7-BeA8 Set oFSO = CreateObject("Scripting.FileSystemObject") z`y9<+ Erase lineArray i%glQT [&Xp]:M'D Dim fid As Long <P9fNBGa If oFSO.fileexists( fileName ) Then (}"D x3K fid = FreeFile() [\uR3$j# Open fileName For Input As fid # kI> lineArray = Split(Input(LOF(fid), fid), vbCrLf) ?HZp@& Close fid +>w]T\[1~ End If T X`X5j Set oFSO = Nothing snV*gSUH Return UBound( lineArray ) e5=d
Ev uFd$*`jS End Function ^6 6!f 5^W
gwZ<$6 Sub GetFileList( ByVal in_dir As String, _ Otn,UoeeB ByRef in_flist() As String ) }fpya2Xt 4 23zX6 'Redimension the file list array
w-jElV Erase in_flist MatXhP] Fi )fH
Q7 'Tracks how many files are found 0oe<=L]F Dim fCount As Long ]AP1+
&9fN fCount = 0 I Mgd2qIC NOz3_k 'Recurse directory and search for text files C
\ Cc[v Dim f As String F c[KIG3@ f = Dir$(in_dir & "*.txt") yI w}n67 While f <> "" 2`yhxO ReDim Preserve in_flist(fCount) BT_]=\zi in_flist(fCount) = f fJ,N.O+9E fCount += 1 rvA>khu0/ f = Dir$() h#rP]o@ Wend r^9l/H~$ ReDim Preserve in_flist(fCount-1) g14*6O: t@RYJmW End Sub ,RP-)j"Wff R^Rc!G} c=\tf~}^Ms QQ:2987619807 ^Fk;t
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