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摘要: z!eY=G' ;g*ab 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。 nKch_Jb jg#%h` 背景:
&+u$96 Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 ?-Fp rC FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 m@)K]0g<f 图1. RPC Photonics工程漫射体结构及光束投射形状 R9~%ORI#; ,qyH B2v q*,];j/>k 步骤 Uk5jZ| UV$v:>K# 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。 $#1i@dI 36e!je 图2. RPC Photonics工程漫射体不同类型的散射数据 V`=#j[gX)= 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) d0eMDIm3R\ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ?u"MsnCXYn 例如下所示: 0 @~[SXR Sample name: EDF-C1-56 YeK PoW Merging data from file EDF-C1-56 0-0.txt ,vl][MhM Finished merging RPC data for sample EDF-C1-56 6*le(^y` FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt j-ZKEA{:1 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Q
>] v?4 a. 创建一个新的散射库 "8>*O;xk b. 散射模型命名 kTt;3 Ia c. 改变散射模型为“Tabulated BSDF”. dr'# d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) '/G.^Zl9 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 P'xq+Q f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, x~rIr#o g. 点击OK H[BY(a@c 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 vE^Hk!^ IMpEp}7 f =B)jYI 脚本代码: ^W{+?q' q;1]M[& '#Language "WWB-COM" qQv?J]l TU&gj1 Option Explicit AtGk
_tpVZ @.6l^"L Sub Main B0T[[%~3M [/.o>R#J( 'Cleanup -Xb]=Yf- ClearOutputWindow() hlWTsi4N wz3BtCx Print "Merging RPC Photonics BSDF Data Files" 3@f@4t@5V SetTextColor(255,0,0) 2&S*> ( Print "Note: Script should be located in the same folder as the BSDF TXT files." #XE`8$
Print "Note: Do not run this script multiple times without deleting the output file between executions." x|&A^hQ SetTextColor(0,0,0) l:5x*QSX 3iMh)YH5b 'Current directory of this script (should be the same as the text files being merged) f$[6]7P Dim cDir As String -}_-#L!Q cDir = MacroDir$ & "\" x'tYf^Va28 o|FRG{TJ 'Array which will be populated with the list of files to be merged -$yNJ5F` Dim fList() As String, curFile As String t:X\`.W GetFileList( cDir, fList ) S7vT= $yS7u Print "" EW7heIT$ Print "Files found for merging:" rf?Q# KM\W For Each curFile In fList Q[O[,Rk Print Chr(9) & curFile q^ lx03 Next cPZD#";f *J&XM[t 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. l(
/yaZ` Dim nameArray() As String, sampName As String Q{F*%X nameArray = Split(fList(0)," 0-0.txt") >jMq-#*4 sampName = nameArray(0) D^V0kC p!F Print "" PZmg7N Print "Sample name: " & Chr(9) & sampName Y).5(t7zaR ?4vf2n@ 'Open an output file and write the FRED header data J-yj&2 Dim outFile As String gIa/sD2m> outFile = cDir & sampName & "_FRED.txt" Exd$v"s
Y Open outFile For Output As #1 g(){wCI Print #1, "type bsdf_data" oju)8H1o# Print #1, "format angles=deg bsdf=value scale=1" /<,LM8n uH 1%diL^ 'Loop the file list, skip the two header lines and write the remaining data to file #Ux*": Dim lineArray() As String, curLine As Long !.9pV.~ For Each curFile In fList w],+l N; Print "Merging data from file " & curFile X+2 aP'D ReadFile( cDir & curFile, lineArray ) Qvo(2( For curLine = 2 To UBound(lineArray) szW_cjS Print #1, lineArray(curLine) ~$xLR/{y Next ~H"Q5Hr Next e%.Xya#\ r:Uqtqxh 'Close the output file ClZ:#uMbN Close #1 gw[\7 ,Yx"3i, Print "Finished merging RPC data for sample " & sampName xDv5'IGBb Print "FRED formatted data file: " & Chr(9) & outFile el
GP2x#: End Sub ]gI>ay"\QA tg%s#lLeH 'Utility function to read the contents of a file into an array of strings. 4pNIsjl} Function ReadFile(ByVal fileName As String, _ 3>LyEXOW ByRef lineArray() As String) As Long d67Q@')00 k+Ew+j1_ ReadFile = -1 n/*BK; Dim oFSO As Object v[4A_WjT Set oFSO = CreateObject("Scripting.FileSystemObject") Zqwxi1 Erase lineArray FgA'X< m]LR4V6k| Dim fid As Long TTB1}j+V6 If oFSO.fileexists( fileName ) Then IO/%X;Y_ fid = FreeFile() +|6
'7Z(9 Open fileName For Input As fid f44b=,Lry5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) 7g@P$e] Close fid }2dz];bR End If t[gz#' Set oFSO = Nothing ,=o)R,[ Return UBound( lineArray ) s%Ez/or(T oJ|8~:) End Function x0aPY;,N0 [X>\!mt Sub GetFileList( ByVal in_dir As String, _ 9v[cy` \ ByRef in_flist() As String ) :5 XNV6^| llG^ +*Y8t 'Redimension the file list array .1F(-mLd Erase in_flist Vf?+->-?{ XP#j9CF#. 'Tracks how many files are found `>M;f%s Dim fCount As Long ki/xo^Y2< fCount = 0 jY^wqQls 7)Zk:53] 'Recurse directory and search for text files q:Lw!'Zh Dim f As String r2:n
wlG f = Dir$(in_dir & "*.txt") p4},xQzB While f <> "" N6CWEIJ ReDim Preserve in_flist(fCount) G55-{y9Q in_flist(fCount) = f ;O8Uc&:P fCount += 1 j#KL"B_A f = Dir$() kaSi sjd Wend w[g(8#* ReDim Preserve in_flist(fCount-1) f5)4H WH`E=p^x4 End Sub ym*,X@Qg^
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