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摘要: !T(Omve) ]7
mSM 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。 M:f=JuAx `bF;Ew; 背景: }@6
%yR 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。 uL AXN 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。 9?,.zc^ 图1. RPC Photonics工程漫射体结构及光束投射形状 lc#zS_ !_!b\ eakIK+-21y 步骤 wcT6d?*5 <t@*[Aw 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。 dV #;]F:TlR 图2. RPC Photonics工程漫射体不同类型的散射数据 DQnWLC"u 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) 74Wg@!P 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 [ i#Gqx>'w 例如下所示: YcZ4y@6" Sample name: EDF-C1-56 1\{F.v Merging data from file EDF-C1-56 0-0.txt RyD$4jk+T" Finished merging RPC data for sample EDF-C1-56 P?7b,a95O FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt +N_%|!F-c 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H;&t"Ql. a. 创建一个新的散射库 X+@,vCC b. 散射模型命名 1R9/AP c. 改变散射模型为“Tabulated BSDF”. E=trJge d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) !2I wuru e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 z59J=?| f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, h!GixN? g. 点击OK ^4NH.q{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 RL9BB. Q6>( Z XS/TYdXB8 脚本代码: B[V=l<J KL`>mJo$ '#Language "WWB-COM" D*,H%xA 'Y Zs6rcJ Option Explicit czRh.kz, o#6}?g. Sub Main mX_`rvYII DboqFh#]=h 'Cleanup "Fiv
]^ ClearOutputWindow() rd{(E s&</zU' Print "Merging RPC Photonics BSDF Data Files" `_i-BdW SetTextColor(255,0,0) `<d>C}9 Print "Note: Script should be located in the same folder as the BSDF TXT files." )_?$B6hf,& Print "Note: Do not run this script multiple times without deleting the output file between executions." .`].\Zykf SetTextColor(0,0,0) [K- s\ rgY~8PY" 'Current directory of this script (should be the same as the text files being merged) RoZV6U~ Dim cDir As String zPYa@0I
cDir = MacroDir$ & "\" {{,%p#/b l?[DO?m+R 'Array which will be populated with the list of files to be merged bHnQLJ Dim fList() As String, curFile As String IIZsN*^ GetFileList( cDir, fList ) ,V?,I9qf (6{
VMQ Print "" 5WYU&8+]{: Print "Files found for merging:" i|mA/
e3b For Each curFile In fList 9A!qg< Print Chr(9) & curFile T-TH.
R Next %?jf.p*kY V^i3:' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. e hq6.+l Dim nameArray() As String, sampName As String W]OT=6u8o nameArray = Split(fList(0)," 0-0.txt") IpxjP\ sampName = nameArray(0) |z%,W/Ef Print "" n21J7;\/+ Print "Sample name: " & Chr(9) & sampName E.9F~&DPJ< P'8E8_M} 'Open an output file and write the FRED header data _?ZT[t<
Dim outFile As String U<b!$"P9 outFile = cDir & sampName & "_FRED.txt" -,&Xp>u\ Open outFile For Output As #1 T_WQzEL^ Print #1, "type bsdf_data" }UrtDXhA Print #1, "format angles=deg bsdf=value scale=1" |.A>0-']M d,)L, J 'Loop the file list, skip the two header lines and write the remaining data to file E_oe1C: Dim lineArray() As String, curLine As Long 51vK> For Each curFile In fList W#!\.m`5 Print "Merging data from file " & curFile o[6hUX0tN ReadFile( cDir & curFile, lineArray ) *)<tyIHd For curLine = 2 To UBound(lineArray) /L.a:Er$ Print #1, lineArray(curLine) X#y l8k_ Next \<} nn?~n Next Ar==@777j K^bn4Nr 'Close the output file fVM%.` Close #1 d\v _!7 t>xV]W< Print "Finished merging RPC data for sample " & sampName e9d~Xi16KY Print "FRED formatted data file: " & Chr(9) & outFile ,#G@ri:B End Sub SxDE3A-: yl}Hr* 'Utility function to read the contents of a file into an array of strings. N+\*:$>zt6 Function ReadFile(ByVal fileName As String, _ 9M<? *8) ByRef lineArray() As String) As Long ;IT^SHym RjDFc:bB ReadFile = -1 yrjm0BM# Dim oFSO As Object j*5VJ: Set oFSO = CreateObject("Scripting.FileSystemObject") KJd;c. Erase lineArray bA)Xjq)Rr I9E@2[=! Dim fid As Long VxCH}&! If oFSO.fileexists( fileName ) Then fp7Qb $-A fid = FreeFile() r!#3>F;B Open fileName For Input As fid .\VjS^o&Z& lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1}6pq2 Close fid wb}tN7~Y; End If <L J$GiU Set oFSO = Nothing ld
$`5!Z Return UBound( lineArray ) 0e7!_/9 N ]duv~JS End Function '|Oi#S +FiV!nRkZ Sub GetFileList( ByVal in_dir As String, _ '.=Z2O3p ByRef in_flist() As String ) $?\],T Z8T{Xw6% 'Redimension the file list array *%O1d., Erase in_flist 8<^,<? :.dQY=6I 'Tracks how many files are found )oj`K,# Dim fCount As Long [D t`@Dm fCount = 0 5?b9[o+D ymKdRF 'Recurse directory and search for text files U2aE:$oeYi Dim f As String & zG= f = Dir$(in_dir & "*.txt") E|>I/!{u7` While f <> "" m[}$&i$( ReDim Preserve in_flist(fCount) BjH(E'K[b in_flist(fCount) = f G2A pm`/ y fCount += 1 qSQjAo4t@ f = Dir$() {b?)|@)is Wend uk1IT4+ ReDim Preserve in_flist(fCount-1) ~ _raI7, 0h7\zoZ5 End Sub
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