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QtvY v! 0ez(A 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。 3e(ehLc4DJ +-E~6^> 背景: 2Ry1b+\ 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。 H,N)4;F<c 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。 kWdi595 图1. RPC Photonics工程漫射体结构及光束投射形状 EvOJ~'2 Y% Mi]L]-L L[=a/|)TBV 步骤 XoA+MuDzpo 97ql5 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。 |=&cQRY!p i+gQE! 图2. RPC Photonics工程漫射体不同类型的散射数据 y#XbJuN/ 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) yRo-EP 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 ?. D3'qv 例如下所示: |g==" Sample name: EDF-C1-56 byv[yGa` Merging data from file EDF-C1-56 0-0.txt Q'%PNrN Finished merging RPC data for sample EDF-C1-56 F^hBtfz FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt vap,y $C 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 G#MdfKH a. 创建一个新的散射库 q7"7U=W0 b. 散射模型命名 =+AS/Jq c. 改变散射模型为“Tabulated BSDF”. 92^w8Z. d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Me=CSQqf< e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 h[PYP5{L f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, .|/~op4; g. 点击OK W^s
;Bi+Nw 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 gB<3-J1R ^$t7+g >Jp:O
7 脚本代码: );FJx~b ZcaX'5}!S '#Language "WWB-COM" QR>gt; 9]e V?yoA8 Option Explicit yrR1[aT Q:5KZm[ [ Sub Main l&[;rh B9wPU1 'Cleanup vBog0KD);s ClearOutputWindow() A\#iXOd G#?Sfn O0 Print "Merging RPC Photonics BSDF Data Files" og0*Nt+ SetTextColor(255,0,0) Qci4J Print "Note: Script should be located in the same folder as the BSDF TXT files." nB!&Zq Print "Note: Do not run this script multiple times without deleting the output file between executions." aJcf`<p SetTextColor(0,0,0) '{(UW.Awo qM.bF&&Go 'Current directory of this script (should be the same as the text files being merged) lv]hTH 4T Dim cDir As String <A#
l
35 cDir = MacroDir$ & "\" 3"P }n &-mX , 'Array which will be populated with the list of files to be merged !tp1:'KG Dim fList() As String, curFile As String 8KRba4[ GetFileList( cDir, fList ) Jej` ;I J.8IwN1E Print "" L@gWzC~?Q Print "Files found for merging:"
##4GK08! For Each curFile In fList #b~JDO( Print Chr(9) & curFile 46 PoM Next ,13Lq- N"3b{Qio 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. W]nSR RWco Dim nameArray() As String, sampName As String A$w4PVS nameArray = Split(fList(0)," 0-0.txt") PnoPbk[< sampName = nameArray(0) |M+<m">E Print "" )LyojwY_g Print "Sample name: " & Chr(9) & sampName APO>y rSJ9v: 'Open an output file and write the FRED header data WH= EPOR, Dim outFile As String %wSj%>&-R outFile = cDir & sampName & "_FRED.txt" p1|f<SF') Open outFile For Output As #1 $k2*[sn, Print #1, "type bsdf_data" 3#TV5+x*"` Print #1, "format angles=deg bsdf=value scale=1" AU$Uxwz4 D)d~3`=# 'Loop the file list, skip the two header lines and write the remaining data to file K5XK%Gl" Dim lineArray() As String, curLine As Long =|YxDas For Each curFile In fList +9")KQT Print "Merging data from file " & curFile r3\cp0P;s ReadFile( cDir & curFile, lineArray ) PZ*pQ=` For curLine = 2 To UBound(lineArray) a(0*um( Print #1, lineArray(curLine) z5r$M Next L*~J%7 Next +*hm-lv? f4PIoZ e 'Close the output file /, ! B2 Close #1 G^`1]? Iwc{R8BV Print "Finished merging RPC data for sample " & sampName [!U?}1YQ Print "FRED formatted data file: " & Chr(9) & outFile Sx8OhUyux End Sub 0eS)&GdR .3MIcj=p 'Utility function to read the contents of a file into an array of strings. $9ky{T?YG Function ReadFile(ByVal fileName As String, _ uECsh2Uin ByRef lineArray() As String) As Long r9ww.PpNk# q2et|QCru ReadFile = -1 NvvUSyk\;s Dim oFSO As Object `IY/9'vT Set oFSO = CreateObject("Scripting.FileSystemObject") L_K=g_] Erase lineArray INyk3`FT }eRD|1 Dim fid As Long g=$1cC+( If oFSO.fileexists( fileName ) Then [mPjP%{=@ fid = FreeFile() 14"J d\M8 Open fileName For Input As fid ?|ZTaX6A lineArray = Split(Input(LOF(fid), fid), vbCrLf) as>L[jyG/ Close fid #2EI\E&$ End If `8Lo {P Set oFSO = Nothing j7)Ao*WN Return UBound( lineArray ) ?:L:EW8 qvv2O1c"A End Function T
N!=@Gy +fnK/%b Sub GetFileList( ByVal in_dir As String, _ [l8jRT=R ByRef in_flist() As String ) rQaxr! \l@,B +) 'Redimension the file list array %3$*K\Ai Erase in_flist ]7/
b/J iIP8`!
O 'Tracks how many files are found K/}rP[H Dim fCount As Long /mK?E5H'r1 fCount = 0 FSRj4e1y1 eEn;!RS) 'Recurse directory and search for text files 4NdN<#Lr Dim f As String 5T:i9h f = Dir$(in_dir & "*.txt") bHI<B)=` While f <> "" +|ycvHd ReDim Preserve in_flist(fCount) edK|NOOZ in_flist(fCount) = f Q
pmsOp| fCount += 1 e A}%C.ZR f = Dir$() <$hu Wend 4DOK4{4?5 ReDim Preserve in_flist(fCount-1) zH*KYB fks)+L' End Sub EKzAd
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