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摘要: Wh5O{G@Ut %<yM=1~> 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。 AW5g ( Hw&M2a 背景: Z;D3lbqE 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。 A#&qoZ(C 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。 C&kl*nO 图1. RPC Photonics工程漫射体结构及光束投射形状 ton`ji\^ ^~ $& VY@hhr1s~ 步骤 tL{~O= <|3v@ 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。 3ohcHQ/a yuEOQ\!(u 图2. RPC Photonics工程漫射体不同类型的散射数据 vp-7>Wj 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) twmJ 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 /
LM 例如下所示: I?Fa Sample name: EDF-C1-56 IQe[ CcM Merging data from file EDF-C1-56 0-0.txt 3z92Gy5cr Finished merging RPC data for sample EDF-C1-56 5KE%@,k k FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt O7'3}P; 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 q-
(NZno a. 创建一个新的散射库 B@inH]wq b. 散射模型命名 NP'Ke: c. 改变散射模型为“Tabulated BSDF”. e-3pg?M 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 ) Ks2%F&\cE 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。 oh0|2IrM 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, a9zph2o-
g. 点击OK E(kpK5h{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GY]6#>D#7 % 3-\3qx* YzW7;U
S 脚本代码: 8:?Q(M7 nvo1+W(% '#Language "WWB-COM" #r)1<}_e# gzCMJ<3!D Option Explicit $1zeY6O U4l*;od Sub Main }"B? 8T@_~ 0$Y 9>)O 'Cleanup }9udo,RWu ClearOutputWindow() kJi&9
]!G>8Rc Print "Merging RPC Photonics BSDF Data Files" J&ECm+2 SetTextColor(255,0,0) Po11EZa$a Print "Note: Script should be located in the same folder as the BSDF TXT files." |4> r" Print "Note: Do not run this script multiple times without deleting the output file between executions." 3J~kiy.nfW SetTextColor(0,0,0) m2q;^o:J *r,&@UB 'Current directory of this script (should be the same as the text files being merged) U"y'Kd Dim cDir As String J*~2:{=% cDir = MacroDir$ & "\" ,x"yZ yb{{ z@ 'Array which will be populated with the list of files to be merged PT@e),{~o9 Dim fList() As String, curFile As String uj9tr`Zh
GetFileList( cDir, fList ) FWpN:|X BS JRjMt-7H_ Print "" 9#T%bB"J Print "Files found for merging:" ?~JxO/K For Each curFile In fList g;#KBxE Print Chr(9) & curFile gLSG:7m@ Next v7<S F 5 (21gW9 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Q@W|GOH3 Dim nameArray() As String, sampName As String i=X* nameArray = Split(fList(0)," 0-0.txt") #"p1Qea$ sampName = nameArray(0) )Z8"uRTb0 Print "" k CW!m Print "Sample name: " & Chr(9) & sampName ^o6)[_L EOPS? @ 'Open an output file and write the FRED header data SeNF!k% Y Dim outFile As String }y-;>i#m=g outFile = cDir & sampName & "_FRED.txt" e8ULf~I Open outFile For Output As #1 F;Q_*0mIQ Print #1, "type bsdf_data" 2Z;`#{ Print #1, "format angles=deg bsdf=value scale=1" *0&4mi8 BsK|:MM] 'Loop the file list, skip the two header lines and write the remaining data to file ;Up'~BP( Dim lineArray() As String, curLine As Long eC^0I78x For Each curFile In fList -_EY$?4 Print "Merging data from file " & curFile juYA`:qE& ReadFile( cDir & curFile, lineArray ) [}p For curLine = 2 To UBound(lineArray) Ck3QrfM Print #1, lineArray(curLine) N(_
.N6 Next 0/SC Next cbh#E)[' 9QOr,~~s 'Close the output file }c35FM, Close #1 a81!~1A cZaF
f?]k Print "Finished merging RPC data for sample " & sampName e+F}9HR7 Print "FRED formatted data file: " & Chr(9) & outFile >w2Q1! End Sub q?;*g@t Y/^[qD 'Utility function to read the contents of a file into an array of strings. H]tSb//qc Function ReadFile(ByVal fileName As String, _ --
i&" ByRef lineArray() As String) As Long 5?3Isw`v2 7wiK.99 ReadFile = -1 Mt[Bq6}ZD Dim oFSO As Object y$j1?7 Set oFSO = CreateObject("Scripting.FileSystemObject") W$ JY M3! Erase lineArray S_T{L FE8+E\ U? Dim fid As Long MtZt8s If oFSO.fileexists( fileName ) Then 9feD!0A fid = FreeFile() zdLVxL>87 Open fileName For Input As fid 8^<c,!DM lineArray = Split(Input(LOF(fid), fid), vbCrLf) B@cJ\ Close fid IwTr'}XIw End If m\*&2Na Set oFSO = Nothing ^i{,z*vi Return UBound( lineArray ) '?{0z!! ;f".'9 l^ End Function < 72s7*Rv DL'd&;6 Sub GetFileList( ByVal in_dir As String, _ B#HnPUUK ByRef in_flist() As String ) A+0T"2 BGB,Gb 'Redimension the file list array ",~ b2]ym Erase in_flist j}|N^A_ S y\F`B0#$ 'Tracks how many files are found K[Yc<Q Dim fCount As Long =w',-+@ fCount = 0 "C:rTIH ^H5w41 'Recurse directory and search for text files /Y;+PAy Dim f As String C+/Eqq^( f = Dir$(in_dir & "*.txt") U/.w;DI While f <> "" *oEv ,I_ ReDim Preserve in_flist(fCount) Q?*
nuE in_flist(fCount) = f u{g]gA8s fCount += 1 (y=dR1p f = Dir$() 6PiEa( Wend 'fS?xDs-v ReDim Preserve in_flist(fCount-1) dzgs%qtK zo_k\K`{@ End Sub k k
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