mbkt7. ,P 摘要: \f^xlX3&` 7>gjq'0
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。 E8r6P:5d` K0j%\]\Tp 背景: z8t;jw 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。 g&y (- 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。图1. RPC Photonics工程漫射体结构及光束投射形状 LEPLoF3, @ !su7 Wjl2S+Cc q`r| DcN~ 步骤 H%Gz" G$TO'Ciu: 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。 Z[*unIk 图2. RPC Photonics工程漫射体不同类型的散射数据 BZQ}c<Nl bKsjbYuo 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) 3f^Pr 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 J";N^OR{A% 例如下所示: hJ`Gu7 Sample name: EDF-C1-56 E&kv4, Merging data from file EDF-C1-56 0-0.txt ;]grbqXVE Finished merging RPC data for sample EDF-C1-56 i%.NP;Qq]M FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Oe\(=R 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 q{9 \hEeb a. 创建一个新的散射库 q( ~rk b. 散射模型命名 xAd@.^ c. 改变散射模型为“Tabulated BSDF”. ?lD)J?j 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 ) .o`Io[io 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。 [yN+(^i 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, H;\C7w| g. 点击OK V5ZC2H 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 kqih`E9P7B *t| !xO $T3_~7N 脚本代码: qA)YYg/G .kU^)H"l '#Language "WWB-COM" ,V!"4T,Z yR|2><A Option Explicit y*^UGJC: *tj(,:! Sub Main n?cC]k;P~ b)'CP Cu* 'Cleanup GgY8\>u ClearOutputWindow() LXX('d o]&q'>Rf Print "Merging RPC Photonics BSDF Data Files"
BM?!? SetTextColor(255,0,0) 03 gbcNo Print "Note: Script should be located in the same folder as the BSDF TXT files." /5Qh*.(S Print "Note: Do not run this script multiple times without deleting the output file between executions." }~zDcj_ SetTextColor(0,0,0) yC 1OeO8{ o+{,>t 'Current directory of this script (should be the same as the text files being merged) b3-j2`# Dim cDir As String FhUi{` cDir = MacroDir$ & "\" /xJD/"Y3& #[9UCX^= 'Array which will be populated with the list of files to be merged fB9,#
F Dim fList() As String, curFile As String 6k;5T GetFileList( cDir, fList ) @Nsn0-B?ne hT-^1:N Print "" X<8|uP4 Print "Files found for merging:" 0,RYO :` For Each curFile In fList <e BmCrJ Print Chr(9) & curFile dQ{qA(m Next hOk9 y= 36OQHv;& 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ?:9y
!Q= Dim nameArray() As String, sampName As String G3TS?u8Q nameArray = Split(fList(0)," 0-0.txt") u]NsCHKlT sampName = nameArray(0) I"czo9Yspd Print "" 0=HB!{@ Print "Sample name: " & Chr(9) & sampName kl:/PM^ Cydo~/ 'Open an output file and write the FRED header data ]dGH
i \ Dim outFile As String *Lrrl outFile = cDir & sampName & "_FRED.txt" A@<
! ' Open outFile For Output As #1 uQdH(): Print #1, "type bsdf_data" nD/B:0' Print #1, "format angles=deg bsdf=value scale=1" eGQ4aQhi .B~yI3D`M 'Loop the file list, skip the two header lines and write the remaining data to file p3 5)K5V Dim lineArray() As String, curLine As Long K>.}>)0 For Each curFile In fList 9~Sa7P Print "Merging data from file " & curFile YQ:$m5ai ReadFile( cDir & curFile, lineArray ) @uyQH c,V For curLine = 2 To UBound(lineArray) BN]o!Y Print #1, lineArray(curLine) ZVH 9je Next yT OZa-
Next N~/X.D4e# Wtu-g**KN 'Close the output file 0(+<uo~6p1 Close #1 yWRIh*>nE 'L O3[G{ Print "Finished merging RPC data for sample " & sampName =Ks&m4 Print "FRED formatted data file: " & Chr(9) & outFile XuJyso9kA End Sub ]*a(^*}A% WDxcV% 'Utility function to read the contents of a file into an array of strings. `m(ZX\W] Function ReadFile(ByVal fileName As String, _ 7#"NKxb ByRef lineArray() As String) As Long
'{cND KtAEM;g ReadFile = -1 _$T
!><)y Dim oFSO As Object 0);5cbV7i Set oFSO = CreateObject("Scripting.FileSystemObject") ?&:N|cltD Erase lineArray 6,LE_ -G5 dl=)\mSFjF Dim fid As Long -n"f>c_{> If oFSO.fileexists( fileName ) Then (^B1Kt!< fid = FreeFile() YkF LNCg4} Open fileName For Input As fid JzywSQ lineArray = Split(Input(LOF(fid), fid), vbCrLf) z@IG"D Close fid KF
*F End If PYi<iSr Set oFSO = Nothing >yn?@ve@ Return UBound( lineArray ) c(Y~5A{TXO )OQm,5F1 End Function f1SKOq _s#J\!F Sub GetFileList( ByVal in_dir As String, _ AUF[hzA ByRef in_flist() As String ) %6lGRq{/? Hvz;[! 'Redimension the file list array tlO=> Erase in_flist {@Lun6\ ]+ub
R; 'Tracks how many files are found oD2! [& Dim fCount As Long .mrv"k\< fCount = 0 $ H@
hs+)a%A3G 'Recurse directory and search for text files ]2"UR_x Dim f As String S`[(y?OF? f = Dir$(in_dir & "*.txt") A1B[5a*o! While f <> "" Rh~j -; ReDim Preserve in_flist(fCount) uh9b!8 in_flist(fCount) = f M1P;x._n fCount += 1 *cFGDQ!
f = Dir$() =1>G*
, Wend s +S6'g-- ReDim Preserve in_flist(fCount-1) |