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摘要: T!eeMsI z6S
N 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。 ?Q;8D@
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7 背景: 1u75 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。 "12.Bi.O"[ 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。 V;mKJ.d${ 图1. RPC Photonics工程漫射体结构及光束投射形状 q PuxYU ,,S5 8\x K2>(C$Z 步骤 _C~e(/=z ?~uTbNR 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。 /vS!9f${ o{pQDI {R 图2. RPC Photonics工程漫射体不同类型的散射数据 /
*xP`'T 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) S9J<3
= 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 db`xlvrCY 例如下所示: aAiSP+# Sample name: EDF-C1-56 'x{g P?. Merging data from file EDF-C1-56 0-0.txt -q|K\>tgU Finished merging RPC data for sample EDF-C1-56 +'Pl?QyH FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt f!a[+^RB: 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 :,%~rR a. 创建一个新的散射库 |`_qmk[:R b. 散射模型命名 [
\ LA c. 改变散射模型为“Tabulated BSDF”. 0RAmwfXm d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) SY>i@s+ML e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 .pNWpWL. f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, c-3AzB#[ g. 点击OK )Q9m,/F 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _HX1E 4YM!S E-I Or=
[2@Wg 脚本代码: 5p}Y6Lc\j I]bqle0M '#Language "WWB-COM" )n}Wb+2I nx`!BNL'V Option Explicit fs+l R nt&<|8G Sub Main _7#Ng@#\ Wk"4mq 'Cleanup 2s>dlz ClearOutputWindow() *,5V;7OR n3t1'_/TU} Print "Merging RPC Photonics BSDF Data Files" _R<eWp SetTextColor(255,0,0) Er^ijh, Print "Note: Script should be located in the same folder as the BSDF TXT files." 0ohpJh61Q Print "Note: Do not run this script multiple times without deleting the output file between executions." H|k!5W^ SetTextColor(0,0,0) ]4-lrI1# _"_ W KlN 'Current directory of this script (should be the same as the text files being merged) _"
W<> Dim cDir As String "-GjwB cDir = MacroDir$ & "\"
GY,l&.& r,X5@/ 'Array which will be populated with the list of files to be merged tp<uN~rTgh Dim fList() As String, curFile As String ,IoPK!5xy GetFileList( cDir, fList ) eBX#^ 4V9DPBh Print "" IXNcn@tN Print "Files found for merging:" y}*rRm.: For Each curFile In fList #7I,.DUy[ Print Chr(9) & curFile 98eiYh Next $Nvt:X_ PhW<)B] 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. RQ}(}|1+\ Dim nameArray() As String, sampName As String #Ki(9oWd nameArray = Split(fList(0)," 0-0.txt") w|:UTJ>@ sampName = nameArray(0) La9v97H: Print "" r2H \B,_ Print "Sample name: " & Chr(9) & sampName .|
CcUmx a)=WDRk 'Open an output file and write the FRED header data Cv862kP Dim outFile As String 0&T0Ls#4 outFile = cDir & sampName & "_FRED.txt" vKN"o* q Open outFile For Output As #1 RFd.L@-] Print #1, "type bsdf_data" )j(13faW| Print #1, "format angles=deg bsdf=value scale=1" yE[ -@3v h1@|UxaE# 'Loop the file list, skip the two header lines and write the remaining data to file 6}wXNTd Dim lineArray() As String, curLine As Long w^MU$ubx For Each curFile In fList j_S/// Print "Merging data from file " & curFile EM]~yn!+ ReadFile( cDir & curFile, lineArray ) ?#?[6t For curLine = 2 To UBound(lineArray) Dz/I"bZLC Print #1, lineArray(curLine) HPl!r0 h Next =S/$h}Vi Next `l,=iy$ 0Ci\( 'Close the output file g.OBh_j-v Close #1 #R$d6N[H 08AC9 Print "Finished merging RPC data for sample " & sampName "]J4 BZD Print "FRED formatted data file: " & Chr(9) & outFile le*mr0a End Sub W$LaXytmak Cc*"cQe 'Utility function to read the contents of a file into an array of strings. CqX2R:# Function ReadFile(ByVal fileName As String, _ -BUxQ8/, ByRef lineArray() As String) As Long *n mr4Q'v{ $G/h-6+8 ReadFile = -1 N1$lG?
)+ Dim oFSO As Object jqxeON Set oFSO = CreateObject("Scripting.FileSystemObject") Q!K@ Erase lineArray dA>=#/" wuE] ju< Dim fid As Long [^xLK If oFSO.fileexists( fileName ) Then 'teToE<i fid = FreeFile() Qj: D=j8 Open fileName For Input As fid ppr95Y]^ lineArray = Split(Input(LOF(fid), fid), vbCrLf) *0]E4]ZO Close fid ,9<}V;( End If kG_ K &,;@ Set oFSO = Nothing Ug>yTc_(7 Return UBound( lineArray ) ^2E\{$J ry9%Y3 End Function 3a PCi>i!_ Jj+|>(P Sub GetFileList( ByVal in_dir As String, _ usEdp ByRef in_flist() As String ) dr0<K[S_ $z,lq#zzl 'Redimension the file list array )W9W8>Cc5_ Erase in_flist i? 5jl&30 taOD,}c|$ 'Tracks how many files are found [of{~ Dim fCount As Long `|K30hRp: fCount = 0 O{Bll;C 5W"&$6vj 'Recurse directory and search for text files C9zQ{G Dim f As String i5wXT f = Dir$(in_dir & "*.txt") ,l`4)@{G While f <> "" _j{^I^P ReDim Preserve in_flist(fCount) sv`+?hjG in_flist(fCount) = f .;j} :< fCount += 1 ~]X4ru5,4 f = Dir$() kBolDPvBG Wend Q\>9PKK ReDim Preserve in_flist(fCount-1) ,grdl|Dg -JOtvJIQI End Sub -o c@$*t
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