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摘要: 85GU~. )eaEc9o> 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。 osdl dS +<o}@hefY2 背景: 6./3w&D; 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。 6A9
r{'1 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。 U+FI^Xrt# 图1. RPC Photonics工程漫射体结构及光束投射形状 70BLd(? n3Q Rn^ nA?Ks!9T 步骤 nWz7$O &K.js 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。 -L&%,% s7>a 图2. RPC Photonics工程漫射体不同类型的散射数据 \]=''C=J 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) MGU%"7i'} 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 'V#$PZx 例如下所示: X&14;lu%p Sample name: EDF-C1-56 'NYW`, Merging data from file EDF-C1-56 0-0.txt $4ZjN N@ Finished merging RPC data for sample EDF-C1-56 *H({q`j33k FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt o/~Rf1 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 'BOMFp7c a. 创建一个新的散射库 1HS43! b. 散射模型命名 8%EauwAx c. 改变散射模型为“Tabulated BSDF”. \\UOpl 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 ) gql^Inx< 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。 cWS 0B $$ 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, s i=m5$V g. 点击OK qb1JE[2F 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^Ez`WP rctGa ,l SWWeN#Q 脚本代码: 0 F-db = Y`e?\#` '#Language "WWB-COM" fDD^?/^ p38RgEf Option Explicit 9T;DFUM /=IBK` Sub Main I:Q3r"1 >,}SP; 'Cleanup #)b0&wyW6i ClearOutputWindow() J-d>#'Wb| Oz-;2 Print "Merging RPC Photonics BSDF Data Files" $WICyI{$ SetTextColor(255,0,0) Mv\]uAT` Print "Note: Script should be located in the same folder as the BSDF TXT files." 'S#D+oF(1~ Print "Note: Do not run this script multiple times without deleting the output file between executions." F*TkQ\y SetTextColor(0,0,0) i8|0zI bJ5 VlK67R 'Current directory of this script (should be the same as the text files being merged) q'1
86L87 Dim cDir As String
Xn= cDir = MacroDir$ & "\" `),ACkU>U =GJ)4os 'Array which will be populated with the list of files to be merged
YG K7b6
Dim fList() As String, curFile As String h"ZR`?h GetFileList( cDir, fList ) bBg=X}9 |kK_B
:K Print "" ]Mb:zs<r Print "Files found for merging:" Tx:S{n7& For Each curFile In fList B`mTp01 Print Chr(9) & curFile teX)!N [ Next /w
"h'u /0z#0gNp 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. =" ;G&)H- Dim nameArray() As String, sampName As String kxWcWl8 nameArray = Split(fList(0)," 0-0.txt") S2<evs1d sampName = nameArray(0) `RHhc{ Print "" <:ptNGR Print "Sample name: " & Chr(9) & sampName Cc&SHG*R ,,+iPGa< 'Open an output file and write the FRED header data *iiyU}x Dim outFile As String K.r
"KxCm| outFile = cDir & sampName & "_FRED.txt" v\3$$T) Open outFile For Output As #1
x=YV* Print #1, "type bsdf_data" IrMxdF~c Print #1, "format angles=deg bsdf=value scale=1" _;'<}a qW
2'?B3< 'Loop the file list, skip the two header lines and write the remaining data to file OKV/=]GS Dim lineArray() As String, curLine As Long MHPh! For Each curFile In fList EK2mJCC| Print "Merging data from file " & curFile S'}pUGDO ReadFile( cDir & curFile, lineArray ) u#)ARCx ,w For curLine = 2 To UBound(lineArray) "|nh=!L Print #1, lineArray(curLine) h[i@c`3/2 Next wq:"/2p1 Next /zg|I?$>Z4 ,~*pPhQ8m 'Close the output file X[J? Close #1 hQ\W~3S55 Ye]-RN/W Print "Finished merging RPC data for sample " & sampName ]US Print "FRED formatted data file: " & Chr(9) & outFile JIU8~D End Sub D* QZR;D#. 0P l>k'9 'Utility function to read the contents of a file into an array of strings. 4Qj@:b Function ReadFile(ByVal fileName As String, _ _"h1#E ByRef lineArray() As String) As Long )MeeF-Ad6 ?!a8'jfs ReadFile = -1 uWjEyxPv{ Dim oFSO As Object :rSCoi>K Set oFSO = CreateObject("Scripting.FileSystemObject") ;D|g5$OE& Erase lineArray K;lxPM] r^T+I3 Dim fid As Long UH`cWV Lpr If oFSO.fileexists( fileName ) Then a_(T9pr fid = FreeFile() g).IF. Open fileName For Input As fid cceh`s=cU lineArray = Split(Input(LOF(fid), fid), vbCrLf) QC<O=<$Q[ Close fid Jxsch\ End If X?++I4\ Set oFSO = Nothing L "5;< Return UBound( lineArray ) tJII-\3" =4#p|OZP End Function G'{*guYU )QW
p[bV Sub GetFileList( ByVal in_dir As String, _ CPci
'SO ByRef in_flist() As String ) guk{3<d:Jy !`0
El',gY 'Redimension the file list array p-kug]qX Erase in_flist Mz: "p. l#& \,T 'Tracks how many files are found I78Q8W(5 Dim fCount As Long W%@0Y m`7 fCount = 0 -0>s`ruor JYrOE"!h 'Recurse directory and search for text files pcNpr`
Dim f As String 0aa&13!5 f = Dir$(in_dir & "*.txt") |h-e+Wh1 While f <> "" n8Rsle`a ReDim Preserve in_flist(fCount) q$kx/6=k in_flist(fCount) = f
:X 9_~ fCount += 1 Odr<fvV,> f = Dir$() ODKHI\U
Wend {r?+PQQ# ReDim Preserve in_flist(fCount-1) .TO#\!KBv *T2kxN,Ik End Sub $_O;yz g3TqTs \kP1 Jr QQ:2987619807 m[<z/D
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