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摘要: 37/n"\4 w6%
Q"%rp 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。 ]yU"J:/ }9'`3vsJ 背景: o|(5Sr&H 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。 _95296 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。 }~XWtWbd- 图1. RPC Photonics工程漫射体结构及光束投射形状 `Z?wj@H1` \n)',4mY QOF@DvQ
步骤 jmM|on! `
R6`"hx$ 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。 '-;[8:y. qos7u91z 图2. RPC Photonics工程漫射体不同类型的散射数据 !Lf<hS^ 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) 9Eyx Ob 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 k"(]V 例如下所示: N4!`iS Y Sample name: EDF-C1-56 0mY Y:?v Merging data from file EDF-C1-56 0-0.txt @c3xUK Finished merging RPC data for sample EDF-C1-56 %z><)7 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt iq(PC3e`V 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NK_|h% a. 创建一个新的散射库 *U?O4E9 b. 散射模型命名 -Aj)<KNx[ c. 改变散射模型为“Tabulated BSDF”. du3f'=q6| 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 ) (jgk !
6 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。 Kx__&a 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, IHl q27O g. 点击OK c3A\~tHW 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 P#,u9EIJ "s*-dZO vT'Bs;QR 脚本代码: yB*,)x0
@ -4a9 BE". '#Language "WWB-COM" BM%wZ:
s WNjwv/ Option Explicit
157_0 H",B[
YK Sub Main n_8[bkbi /0h
*(nL 'Cleanup kNEEu!G ClearOutputWindow() b'H'QY
d2
^}ooE Print "Merging RPC Photonics BSDF Data Files" C_.9qo]DT7 SetTextColor(255,0,0) 24mdhT| Print "Note: Script should be located in the same folder as the BSDF TXT files." ?9b9{c'an Print "Note: Do not run this script multiple times without deleting the output file between executions." 'Wonz<{' SetTextColor(0,0,0) 2ej7Ql_@c kIrrbD 'Current directory of this script (should be the same as the text files being merged) BT$p~XB Dim cDir As String 5Wt){rG0Z cDir = MacroDir$ & "\" f-=\qSo m7 =$*1k 'Array which will be populated with the list of files to be merged iTVe8eI Dim fList() As String, curFile As String \U~4b_aN GetFileList( cDir, fList ) c8qr-x1HG ^rkKE
dd Print "" j]a$RC# Print "Files found for merging:" TOYK'|lwM For Each curFile In fList ]Z JoC!u Print Chr(9) & curFile P:qmg"i@3 Next 6K $mW YdY-Jg Xm 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. wucdXj{% Dim nameArray() As String, sampName As String bQAznd0 nameArray = Split(fList(0)," 0-0.txt") mYBEjZB sampName = nameArray(0) 7p&jSOY Print "" ;|N:FG Print "Sample name: " & Chr(9) & sampName BxY t*b% g8),$:Uw 'Open an output file and write the FRED header data [}X|&`'i Dim outFile As String <_tmkLeZf outFile = cDir & sampName & "_FRED.txt" cw;wv+|k Open outFile For Output As #1 #m+!< Print #1, "type bsdf_data" =bC
+1
C Print #1, "format angles=deg bsdf=value scale=1" 9N]Xa q^@*{H 'Loop the file list, skip the two header lines and write the remaining data to file .u`[|:K Dim lineArray() As String, curLine As Long \/-c) For Each curFile In fList ?I.9?cQXZ Print "Merging data from file " & curFile fGgt[f[ ReadFile( cDir & curFile, lineArray ) ^\)a[OWp For curLine = 2 To UBound(lineArray) 5:Qz Print #1, lineArray(curLine) ."K>h3(&V Next X@nBj;
Next Vs>Pv$kW 0QQss 'Close the output file
idmU.` Close #1 8WP>u8& yev!Nw Print "Finished merging RPC data for sample " & sampName -H1=N Print "FRED formatted data file: " & Chr(9) & outFile E3L?6Qfx> End Sub ~PQ.l\C ;rh.6D l 'Utility function to read the contents of a file into an array of strings. ^s,3*cAU Function ReadFile(ByVal fileName As String, _ lwnO ByRef lineArray() As String) As Long iP/v"g"g BEZ~<E&0H ReadFile = -1 !Jg;%%E3:i Dim oFSO As Object )!y>2$20 r Set oFSO = CreateObject("Scripting.FileSystemObject") ^({)t Erase lineArray NgNGq\! 3f|}p{3 Dim fid As Long >nSsbhAe If oFSO.fileexists( fileName ) Then KaIKb=4L| fid = FreeFile() LvG.ocCG Open fileName For Input As fid a+h$u lineArray = Split(Input(LOF(fid), fid), vbCrLf) wNONh`b Close fid }v1wpv/b( End If ;!yK~OBxt Set oFSO = Nothing bT,:eA Return UBound( lineArray ) P-m_], rK~-Wzwu End Function {+N<
9(O (1/Sf&2i Sub GetFileList( ByVal in_dir As String, _ M8^ID # ByRef in_flist() As String ) 3qYGEhxv `CK~x= 'Redimension the file list array ~W'DEpq_ Erase in_flist %zavSm" $+gQnI3w 'Tracks how many files are found s8j |>R|k Dim fCount As Long `At.$3B fCount = 0 n}p G&&;q C* `WMP* 'Recurse directory and search for text files 9t! d.} Dim f As String j:9M${~ f = Dir$(in_dir & "*.txt") zal]t$z> While f <> "" #h!+b ReDim Preserve in_flist(fCount) , c.^"5 in_flist(fCount) = f {9IRW\kn fCount += 1 kuY^o,u-1e f = Dir$() whI{?NP Wend ~Ps *i]n( ReDim Preserve in_flist(fCount-1) B5\l&4X +)jUA]hJ/ End Sub o<g?*"TRh .5JIQWE( b3NIFKw QQ:2987619807 1nVQYqT_
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