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摘要: CSU> nIE0 /KKX;L[D( 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,agPG\+ U(./LrM05 背景: v%aD:%wlY@ 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。 l}AB):<Z 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。 o7 !@WOeZ3 图1. RPC Photonics工程漫射体结构及光束投射形状 +N4h
Q" :OI!YR%" v;K\#uc_ 步骤 l:@.D|(o3 +[2lS54"W4 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。 *pasI.2s# dy`~%lX? 图2. RPC Photonics工程漫射体不同类型的散射数据 EoY#D'[ 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) 71 /6=aq>n 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 6ldDt?iSg 例如下所示: ;U`HvIch Sample name: EDF-C1-56 |E7]69=P Merging data from file EDF-C1-56 0-0.txt 5?vIkf Finished merging RPC data for sample EDF-C1-56 [=E<iPl FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt I3s}t$`y( 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *`jEg=) a. 创建一个新的散射库 &(.ZHF b. 散射模型命名 Dkdm~~Rr c. 改变散射模型为“Tabulated BSDF”. 7SqsVq`[~ 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 ) x@k9]6/zs 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。 A`r&"i OKA 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:utw T g. 点击OK Ta[}k/zW 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 YT:5J%" lMO0d_:b1 /r?X33D! 脚本代码: zR<jZwo]# (8ymQ!aY '#Language "WWB-COM" lp]O8^][& )US)-\^ Option Explicit $4M3j%S j/Kw-h ,5" Sub Main uuC/F_='B $Y4
Ao-@ 'Cleanup [wOO)FjT ClearOutputWindow() ?QMs< l;;:3: Print "Merging RPC Photonics BSDF Data Files" p{U8z\ SetTextColor(255,0,0)
:D/R Print "Note: Script should be located in the same folder as the BSDF TXT files."
w\QpQ~OX Print "Note: Do not run this script multiple times without deleting the output file between executions." 4v?S`w:6 SetTextColor(0,0,0) eX$Biv1N F%|(pHk 'Current directory of this script (should be the same as the text files being merged) 7:;V[/ Dim cDir As String O,;SA cDir = MacroDir$ & "\" {M$8V~8D 6Rt pB\hq 'Array which will be populated with the list of files to be merged /;>EyWW Dim fList() As String, curFile As String GS^4tmc GetFileList( cDir, fList ) d8K^`k+x NSkI2>+P Print "" >]`x~cE.5 Print "Files found for merging:" /za,&7sf For Each curFile In fList s6
^JgdW Print Chr(9) & curFile k{#:O= Next U9q*zP_jV @GV^B'}* 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. SW=p5@Hy{ Dim nameArray() As String, sampName As String [+1
i$d nameArray = Split(fList(0)," 0-0.txt") s0h)~z sampName = nameArray(0) _\<M58/z Print "" qnlj~]NV Print "Sample name: " & Chr(9) & sampName =os j}( +(<f(]bG 'Open an output file and write the FRED header data BKTsc/v2>: Dim outFile As String ^q6~xC,/ outFile = cDir & sampName & "_FRED.txt" |
jkmh6 Open outFile For Output As #1 t&oNJq{ Print #1, "type bsdf_data" @PI\.y_w Print #1, "format angles=deg bsdf=value scale=1" bM'AD[ %|I|Mc 'Loop the file list, skip the two header lines and write the remaining data to file wVVe L$28 Dim lineArray() As String, curLine As Long ~:@H6Ke[ For Each curFile In fList izxCbbg Print "Merging data from file " & curFile )<|T Ep4r- ReadFile( cDir & curFile, lineArray ) :s5g6TR For curLine = 2 To UBound(lineArray) Z*)<E) Print #1, lineArray(curLine) Cr`
0C Next BAhC-;B#R Next x0d+cSw f.= E. % 'Close the output file 4|(?Wt)5 Close #1 x\%egw =bDG|:+ Print "Finished merging RPC data for sample " & sampName 0b4OJ[ Print "FRED formatted data file: " & Chr(9) & outFile (gZ!o_ End Sub >g[W@FhT'k jz)H?UuDY 'Utility function to read the contents of a file into an array of strings. DHAWUS6 Function ReadFile(ByVal fileName As String, _ TU/J]'))C ByRef lineArray() As String) As Long 5c"kLq6r B'Wky>5) ReadFile = -1 _x!pMj(A Dim oFSO As Object 5-OvPTY`M Set oFSO = CreateObject("Scripting.FileSystemObject") cC4T3]4l' Erase lineArray CytpL`&^] No7Q,p Dim fid As Long j#& If oFSO.fileexists( fileName ) Then C gx?K]>y fid = FreeFile()
q0~_D8e, Open fileName For Input As fid ?@1'WD t lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2]+.8G7D% Close fid +RkYW*|$S End If ~laZ(Bma); Set oFSO = Nothing a%dx\&K Return UBound( lineArray ) h,x] z+*Z<c5d End Function
,<1* .6K>" Sub GetFileList( ByVal in_dir As String, _ R%%`wmG)" ByRef in_flist() As String ) `y`xk<q k3 l 'Redimension the file list array +HX'A C Erase in_flist }kj6hnQ {<kG{i/ 'Tracks how many files are found ZkW@ |v
Dim fCount As Long {rT`*P~ fCount = 0 U3}R^W~eb qedGBl& 'Recurse directory and search for text files |Z ,G
Dim f As String 6<Z:Xw f = Dir$(in_dir & "*.txt") yjd'{B9{ While f <> "" 5F"?]'*/ ReDim Preserve in_flist(fCount) O@iW?9C+ in_flist(fCount) = f tWnm{mF fCount += 1 W[Bu&?h$ f = Dir$() oui!fTy Wend F-^HN% ReDim Preserve in_flist(fCount-1) +,Az\aT/% (GG"'bYk End Sub s3{s.55{m 3Mx@ )\-";?sYky QQ:2987619807 sw|:Z(`
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