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摘要: @,j*wnR AG
nxYV"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。 JJ-( Sl nt;m+by 背景: Rxt^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。 98c(< 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。 ZL&qp04} 图1. RPC Photonics工程漫射体结构及光束投射形状 #FLb*%Nr 4&lv6`G ` q4h]o^ + 步骤 oN~&_*FE /|m2WxK) 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。 H\" sgoJ aH(J,XY 图2. RPC Photonics工程漫射体不同类型的散射数据 f1RWP@iar 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)
Ux!p8 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 Vi$~-6n& 例如下所示: 4}baSV Sample name: EDF-C1-56 m#Jmdb_ Merging data from file EDF-C1-56 0-0.txt h|9L5 Finished merging RPC data for sample EDF-C1-56 ' ,wFTV& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt fSj5ZsO 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Pl06:g2I a. 创建一个新的散射库 lN
4oW3QT b. 散射模型命名 J$DE"|- c. 改变散射模型为“Tabulated BSDF”. |-67\p] 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 ) 1Faf$J~7| e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 A0s ZOCky f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, wo{gG?B g. 点击OK &{n.]]%O. 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +4~_Ei[i Igt#V;kK"2 *!t/"b 脚本代码: @l5"nBs<_: U[-o> W# '#Language "WWB-COM" vzAax k% z6\UGSL Option Explicit _Kf% \xg Ms#M+[a Sub Main N7zft yjX9oxhtL 'Cleanup ZgcMv,= ClearOutputWindow() h
0Q5-EA '3tCH)s Print "Merging RPC Photonics BSDF Data Files" ibk6|pp SetTextColor(255,0,0) 7hcYD!DS Print "Note: Script should be located in the same folder as the BSDF TXT files." f|c{5$N! Print "Note: Do not run this script multiple times without deleting the output file between executions." 9ULQrq$? SetTextColor(0,0,0) ,AFu C< s?}e^/"v 'Current directory of this script (should be the same as the text files being merged) (NU
NHxi5B Dim cDir As String R4cM%l_#W cDir = MacroDir$ & "\" c
( C%Hld =z69e%. 'Array which will be populated with the list of files to be merged n0 {i&[I~+ Dim fList() As String, curFile As String OX!tsARC@ GetFileList( cDir, fList ) D2eckLT D_*WYV Print "" _S1>j7RQo Print "Files found for merging:" 5coyr`7mP For Each curFile In fList CYP q#rd Print Chr(9) & curFile dn+KH+v Next _C?hHWSf" @o _}g !9= 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. "?xHlYj@+ Dim nameArray() As String, sampName As String m}t`FsB. nameArray = Split(fList(0)," 0-0.txt") osAd1<EIC sampName = nameArray(0) PiIpnoM Print "" HCs?iJ Print "Sample name: " & Chr(9) & sampName Jhhb7uU+ )9`qG:b' 'Open an output file and write the FRED header data \&3+D8H>n Dim outFile As String g|yvF-+ outFile = cDir & sampName & "_FRED.txt" 'Aq{UGN Open outFile For Output As #1 6ojo :-%Vf Print #1, "type bsdf_data" IueFx u Print #1, "format angles=deg bsdf=value scale=1" J @1!Oq> .}TZxla0Zr 'Loop the file list, skip the two header lines and write the remaining data to file <uw9DU7G Dim lineArray() As String, curLine As Long ]MitOkX For Each curFile In fList ?mxMk6w Print "Merging data from file " & curFile K`zdc`/ ReadFile( cDir & curFile, lineArray ) IK=a*}19L For curLine = 2 To UBound(lineArray) ??vLUv Print #1, lineArray(curLine) | rtD.,m Next c9 _rmz8 Next |FZ/[9*
:KP@RZm 'Close the output file Ai?*s%8v Close #1 bJ {'<J "_NN3lD)X Print "Finished merging RPC data for sample " & sampName 8^+%I/S$ Print "FRED formatted data file: " & Chr(9) & outFile H3=qe I End Sub A[{yCn`tM D'PI1
0t 'Utility function to read the contents of a file into an array of strings. #gs`#6 ,' Function ReadFile(ByVal fileName As String, _ D.u{~ ByRef lineArray() As String) As Long [<yaXQxl O;jrCB ReadFile = -1 `e&Suyf4B Dim oFSO As Object ~4Fvy' Set oFSO = CreateObject("Scripting.FileSystemObject") `kXs;T6& Erase lineArray PB*&aYLU 21l;\W Dim fid As Long -zeG1gr3 If oFSO.fileexists( fileName ) Then .|fHy fid = FreeFile() s-Tv8goNV Open fileName For Input As fid AH7}/Rc lineArray = Split(Input(LOF(fid), fid), vbCrLf) pO3SUOP Close fid 5e^ChK0Q End If 2eY_%Y0 Set oFSO = Nothing flbd0NB Return UBound( lineArray ) <<5(0#y# N5
6g+,w%) End Function 0IBSRFt$g& ?1
4{J]H4 Sub GetFileList( ByVal in_dir As String, _ N<VJ(20y ByRef in_flist() As String ) ?NsW|w_ })Vi 'Redimension the file list array xY(*.T9K Erase in_flist 0GCEqQy8 xfe+n$~ c 'Tracks how many files are found &B1Wt |