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摘要: 1=Npq=d nO-1^HUl 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。
%T9'dcM IJX75hE0g 背景: [!Uzw2 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。 @~WSWlQW 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。 3%`asCW$ 图1. RPC Photonics工程漫射体结构及光束投射形状 m"3gTqG 2e~ud9, q6E8^7RtS@ 步骤 *\W
*,D.I rqa?A}' 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。 tR`'( *wh w]2tb 图2. RPC Photonics工程漫射体不同类型的散射数据 B#Sg:L9Tr' 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) |Uf[x[ 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 xnz(hz6 例如下所示: 7,vvL8\NHu Sample name: EDF-C1-56 Wk3R6
V Merging data from file EDF-C1-56 0-0.txt "^?|=sQ Finished merging RPC data for sample EDF-C1-56 !{On_>`, FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt @|A
wT 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /m#!<t7 a. 创建一个新的散射库 .4I"[$?Q b. 散射模型命名 s
Yp?V\Y" c. 改变散射模型为“Tabulated BSDF”. 8&d s 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 ) B^8]quOH 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。 -TL `nGF 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, NR98I7 g. 点击OK V*
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^ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 WsHC%+\' "XvM1G&s` wO\,?SI4 脚本代码: G3 h&nH,> e[5=?p@| '#Language "WWB-COM" ;4E(n <<Zt.!hS Option Explicit $inpiO|s >LqW;/&S< Sub Main 'VH%cz* c{X>i>l> 'Cleanup i^Ba?r;* ClearOutputWindow() s]=bg+v?j
RDFOUqS Print "Merging RPC Photonics BSDF Data Files" 3WH"NC-O< SetTextColor(255,0,0) Z{'.fq2A Print "Note: Script should be located in the same folder as the BSDF TXT files." 1w30Vj2< Print "Note: Do not run this script multiple times without deleting the output file between executions." <W$Ig@4[.d SetTextColor(0,0,0) c UJUZ@ol 4JOw@/nE 'Current directory of this script (should be the same as the text files being merged) D4';QCwo Dim cDir As String .W[[Z;D cDir = MacroDir$ & "\" B Q)1)8r :#yjg1aej 'Array which will be populated with the list of files to be merged y[L7=Td Dim fList() As String, curFile As String Q#wl1P GetFileList( cDir, fList ) 7&I+mw/X (YOp Print "" jg,oGtRz Print "Files found for merging:" ,7wxVR%Ys For Each curFile In fList J~\`8cds Print Chr(9) & curFile d-cK`pSB Next ^N{Lau gWqO5C~h 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. x+mfQcSD& Dim nameArray() As String, sampName As String R78=im7 nameArray = Split(fList(0)," 0-0.txt") x{Gdr51% sampName = nameArray(0) T3-8AUCK8? Print "" 4^? J BpBZ Print "Sample name: " & Chr(9) & sampName rXortK#\% 83^|a5 'Open an output file and write the FRED header data l}#z#L2,` Dim outFile As String Y~R['u, outFile = cDir & sampName & "_FRED.txt" n\U3f M>N Open outFile For Output As #1 &HS6} Print #1, "type bsdf_data" Obd};&6Q Print #1, "format angles=deg bsdf=value scale=1" U}r^M(
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{~A:B 'Loop the file list, skip the two header lines and write the remaining data to file uTSTBI4t Dim lineArray() As String, curLine As Long C>1fL6ct For Each curFile In fList |fQl0hL Print "Merging data from file " & curFile q;XO1Se ReadFile( cDir & curFile, lineArray ) +`@)87O For curLine = 2 To UBound(lineArray) LTSoo.dE Print #1, lineArray(curLine)
]+ \]2`? Next "cK@Yo Next y093- EPY64{ 'Close the output file 8SG*7[T7 Close #1 K
>-)O=$s 3I rmDT Print "Finished merging RPC data for sample " & sampName zsQhydTR Print "FRED formatted data file: " & Chr(9) & outFile _~^JRC[q End Sub Pf?*bI %J_`-\)"{~ 'Utility function to read the contents of a file into an array of strings. 'dnTu@mUT Function ReadFile(ByVal fileName As String, _ (l|:$%[0 ByRef lineArray() As String) As Long ("UzMr, T'n~QfU ReadFile = -1 R4?OFhN9 Dim oFSO As Object G! y~Y]e Set oFSO = CreateObject("Scripting.FileSystemObject") (x.O]8GKP Erase lineArray 0K0[mC}ZwM [sM~B Dim fid As Long ~@3X&E0S If oFSO.fileexists( fileName ) Then QasUgZ fid = FreeFile() aNqhxvwf Open fileName For Input As fid >bKN$,Qen lineArray = Split(Input(LOF(fid), fid), vbCrLf) }~Am{Er<l Close fid U[!x
0M End If D@M
ZTb Set oFSO = Nothing XT n`$}nz Return UBound( lineArray ) [Rqv49n*V 3#d5.Ut End Function z}Qt6na]- ;NyX9&@ Sub GetFileList( ByVal in_dir As String, _ {V> >a ByRef in_flist() As String ) `%8by y@$ =Ws-s f] 'Redimension the file list array HzW`j"\ Erase in_flist 7TTU&7l~ i.0}d5Y 'Tracks how many files are found +) pO82 Dim fCount As Long sC8C><y
fCount = 0 I?).D?o Z#-:zD7_ 'Recurse directory and search for text files l?+67cQLA Dim f As String MjO.s+I f = Dir$(in_dir & "*.txt") Vb=Oz While f <> "" 0?D`|x_ ReDim Preserve in_flist(fCount) 07zbx6:t in_flist(fCount) = f g$++\%k& fCount += 1 piZ0KA" f = Dir$() ebbC`eFD Wend CM ; r\,o ReDim Preserve in_flist(fCount-1) @"`J~uK gAy,uP~, End Sub ` |p3@e (GLd"Zq ^ Vl{IsY QQ:2987619807 s!\:%N
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