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摘要: [ Q=)f K~,,xsy,G& 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。 M?$-u <ze'o.c 背景: g:;v] Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。
6/@ cP/ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 w=#&(xm0 图1. RPC Photonics工程漫射体结构及光束投射形状 sd8o&6 A7|"0*62 ,Z>Rv Ll 步骤 Uk;SY[mU ^5,ASU 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 J4lE7aFDA~ @[
:s P 图2. RPC Photonics工程漫射体不同类型的散射数据 >454Yir0Mk 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) kmov(V 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 [.<vISRir 例如下所示: s|,gn 5 Sample name: EDF-C1-56 KM0#M'dXy Merging data from file EDF-C1-56 0-0.txt sSD(mO<( Finished merging RPC data for sample EDF-C1-56 7qW:^2y FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt LDPo}ogs 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 @4$F%[g
h a. 创建一个新的散射库 V!}, a@>p b. 散射模型命名 |UR.7rOV c. 改变散射模型为“Tabulated BSDF”. Uut,cQ". d 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 ) &nz1[, 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。 YuPgsJ[m 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, sL&u%7>Re g. 点击OK tanuP@O 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 C7+TnJ $(zJ -BoN}xE4 脚本代码: NoYu"57\ `+zr PpX '#Language "WWB-COM" fG,qax`:c B0R[f Option Explicit &G<ZK9Ot}0 Z6h.gaQ7
H Sub Main M
$e~Rlw a~XNRAh 'Cleanup {5%<@<?) ClearOutputWindow() 8d$~wh !%@n067 Print "Merging RPC Photonics BSDF Data Files"
w$B7..r SetTextColor(255,0,0) ut\9@>*J=Q Print "Note: Script should be located in the same folder as the BSDF TXT files." }qlz^s Print "Note: Do not run this script multiple times without deleting the output file between executions." ;H\,w/E9 SetTextColor(0,0,0) 0IA
'8_K P_ZguNH 'Current directory of this script (should be the same as the text files being merged) :'!?dszS Dim cDir As String KqtI^qC8 cDir = MacroDir$ & "\" n$=n:$`q qx!IlO 'Array which will be populated with the list of files to be merged Rwy:.)7B$q Dim fList() As String, curFile As String 'GW@P GetFileList( cDir, fList ) R
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{'r*Jb0 Print "" ^NnZYr. Print "Files found for merging:" 9f"6Jw@F For Each curFile In fList ?tSY=DK\n Print Chr(9) & curFile Y":hb;& Next ZjI^0D8 ]}5jX^j 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. !8A5Y[(XD Dim nameArray() As String, sampName As String 9td(MZ%i~N nameArray = Split(fList(0)," 0-0.txt") >2C;5ba sampName = nameArray(0) h2BD?y Print "" BM3)`40[] Print "Sample name: " & Chr(9) & sampName i&bttSRNV c2F`S1Nu< 'Open an output file and write the FRED header data L$ ON=$q5 Dim outFile As String j?8E >tM outFile = cDir & sampName & "_FRED.txt" (sl]%RjGa Open outFile For Output As #1 ?3zx?>sG Print #1, "type bsdf_data" mV4} - Print #1, "format angles=deg bsdf=value scale=1" `/|=eQ")o@ em W#ZX 'Loop the file list, skip the two header lines and write the remaining data to file .g|pgFM? Dim lineArray() As String, curLine As Long Tw`l4S& For Each curFile In fList Aw|3W ] Print "Merging data from file " & curFile W&yw5rt** ReadFile( cDir & curFile, lineArray ) @ ?%"nK For curLine = 2 To UBound(lineArray) >5N}ZIN Print #1, lineArray(curLine) @rJ#Dr Next j1d=$'a " Next /3c1{%B\ zf S<X 'Close the output file uC}YKT>V7 Close #1 %-SP VtmUK$k}I Print "Finished merging RPC data for sample " & sampName U
*I52$ Print "FRED formatted data file: " & Chr(9) & outFile --/ . End Sub 9GGBJTk- J$P]>By5: 'Utility function to read the contents of a file into an array of strings. d6n6 =
[* Function ReadFile(ByVal fileName As String, _ P$oa6`%l ByRef lineArray() As String) As Long ![V<vIy ^wHO!$ ReadFile = -1 :@3d Dim oFSO As Object Z?@07Y[|K Set oFSO = CreateObject("Scripting.FileSystemObject") VEpQT
Qp Erase lineArray EgO4:8$h +tA rH
C] Dim fid As Long /2U.,vw If oFSO.fileexists( fileName ) Then Xgl>kJy<# fid = FreeFile() [[|;Wr}2 Open fileName For Input As fid <l6CtK@ lineArray = Split(Input(LOF(fid), fid), vbCrLf) cK?t]%S Close fid LTCjw_<7 End If
8~I>t9Q+ Set oFSO = Nothing bEE:6)]G Return UBound( lineArray ) +pV3.VMH0 :L?zk"0C End Function un/R7" [v&_MQ Sub GetFileList( ByVal in_dir As String, _ pp-Ur?PM ByRef in_flist() As String ) duqu}*Jw C8jZcs#4 'Redimension the file list array - Z|1@s& Erase in_flist t3WlVUtq3 ruW6cvsvet 'Tracks how many files are found :G`_IB\ Dim fCount As Long Y#m0/1- fCount = 0 &]M<G)9 Jw^+t)t 'Recurse directory and search for text files A<Na,EC Dim f As String nxJhK
T f = Dir$(in_dir & "*.txt") *83+!DV| While f <> "" Vz#cb5:g ReDim Preserve in_flist(fCount) `#UTOYx4 in_flist(fCount) = f =1,g#HS fCount += 1 AsLAm#zq f = Dir$() 9X(bByEO Wend ~<eiWDf ReDim Preserve in_flist(fCount-1) 8R
z=)J f(C0&"4e End Sub (>jME
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