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摘要: l)V646-O,~ 8tzL.P^ 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。 w{GEWD{& /buj(/q^# 背景: :N' 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。 <eZrb6a' 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。 e1hf{:&/G@ 图1. RPC Photonics工程漫射体结构及光束投射形状 {~#d_!( D!i|KI/ f4vdJ5pV 步骤 .`oKd@I*" TV}=$\D 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Sp]ov:]%f S`vw<u4t 图2. RPC Photonics工程漫射体不同类型的散射数据 SKGnx 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) #hXuGBZEI 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 M{p9b E[j 例如下所示: ;HiaX<O! Sample name: EDF-C1-56 r>G||/Z Merging data from file EDF-C1-56 0-0.txt BL%3[JQ Finished merging RPC data for sample EDF-C1-56 zR?1iV.] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt
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FK+> 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >E
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cocM a. 创建一个新的散射库 tZ:fOM b. 散射模型命名 o%K1!' c. 改变散射模型为“Tabulated BSDF”. -o57"r^x d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) (A-Uo
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 1 K] f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ;|f]e/El g. 点击OK oUB9)C~ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 T7N\b]?j@Y `R*!GHro 4}]In/yA 脚本代码: !ED,'d%J Ld=6'C8ud '#Language "WWB-COM" (V"7H 1"T&B0G3l Option Explicit f|2QI~R A$?o3--#]G Sub Main B9'2$s+Z; mOFp!( 'Cleanup <iM}p^jX9 ClearOutputWindow() Gz7,g
Y Dc] J3r Print "Merging RPC Photonics BSDF Data Files" 2-^['R SetTextColor(255,0,0) x_= 3!) Print "Note: Script should be located in the same folder as the BSDF TXT files." ='(;!3ZH Print "Note: Do not run this script multiple times without deleting the output file between executions." Hq,znRz~` SetTextColor(0,0,0) uC2 5pH" '(8}
<(% 'Current directory of this script (should be the same as the text files being merged) #:Ukv? Dim cDir As String AS lmW@/9v cDir = MacroDir$ & "\" q\Z9.T+Qo Vb?_RE_H 'Array which will be populated with the list of files to be merged OO;I^`Yn Dim fList() As String, curFile As String >jc17BJq GetFileList( cDir, fList ) O\ w-hk d/E0opv Print "" s2K8|q= Print "Files found for merging:" ,;yaYF6|/ For Each curFile In fList %gTY7LIe1z Print Chr(9) & curFile RMAbu*D0 Next y <P1VES Ua+Us"M3} 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. v&` n}lS Dim nameArray() As String, sampName As String ,MD>Jx| nameArray = Split(fList(0)," 0-0.txt") T=fVD8 sampName = nameArray(0) CDDEWVd Print "" ]jV1/vJ-! Print "Sample name: " & Chr(9) & sampName RR>G}u9np P}-S[[b73s 'Open an output file and write the FRED header data !1P<A1K Dim outFile As String Qq\hD@Z| outFile = cDir & sampName & "_FRED.txt" Rz33_ qA Open outFile For Output As #1 ~bfjP2
g Print #1, "type bsdf_data" kqLpt Print #1, "format angles=deg bsdf=value scale=1" 9A}nZ1Y 5~"m$/yE 'Loop the file list, skip the two header lines and write the remaining data to file dVBr-+ Dim lineArray() As String, curLine As Long G)%r|meKGB For Each curFile In fList $oZV 54 Print "Merging data from file " & curFile i.+#a2 ReadFile( cDir & curFile, lineArray ) T7*p!0 For curLine = 2 To UBound(lineArray) u6*mHkM Print #1, lineArray(curLine) g+=f=5I3 Next 7] 17?s]t, Next KPa&P:R3 T2 V(P>E 'Close the output file 1(4IcIR5T; Close #1 ^2mCF cA`X(Am6]g Print "Finished merging RPC data for sample " & sampName gR k+KGKn< Print "FRED formatted data file: " & Chr(9) & outFile 1VG7[#Zy End Sub o[nr) z4(Q.0x7 'Utility function to read the contents of a file into an array of strings. `R:HMO[ow Function ReadFile(ByVal fileName As String, _ 1@Rl^ey ByRef lineArray() As String) As Long !^w}Sp It8@Cp.dU ReadFile = -1 AHTQF#U^ Dim oFSO As Object /^Zgv-n Set oFSO = CreateObject("Scripting.FileSystemObject") \05 n$. Erase lineArray 9K#U<Q0b' Tc;j)_C) Dim fid As Long QBTjiaYGa' If oFSO.fileexists( fileName ) Then o&rNM5: fid = FreeFile() ~)!vhdBe Open fileName For Input As fid CSIsi]H lineArray = Split(Input(LOF(fid), fid), vbCrLf) h?&S*)1 Close fid 5i&+.?(Z= End If }U$p[Gi< Set oFSO = Nothing 8MCSU'uQ Return UBound( lineArray ) 3HB(rTw uJ%XF*> _D End Function x5!lnN,# M!]g36h[ Sub GetFileList( ByVal in_dir As String, _ ziD+% - ByRef in_flist() As String ) Rm=[Sj84 1&JB@F9! 'Redimension the file list array qISzn04 Erase in_flist `xu/|})KI Ec|5'Kz] 'Tracks how many files are found __,}/|K2 Dim fCount As Long +FtL_7[v fCount = 0 qvN 5[rb !8OUH6{2 'Recurse directory and search for text files JJE0q5[ Dim f As String 4(}V$#^+ f = Dir$(in_dir & "*.txt") H iDL:14 While f <> "" T~-PT39E ReDim Preserve in_flist(fCount) (ysDs[?\ in_flist(fCount) = f M9dUo7 fCount += 1 8nHFNOv6 f = Dir$() DX@*lM Wend #wZBWTj. ReDim Preserve in_flist(fCount-1) -$5nqaK? )x&OdFX End Sub isV9nWo$
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