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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。 ,%V%g!6{ [z;}^ 3b 背景: nS.qK/.s 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。 :Us+u-~ 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。 *|L;&XM&/ 图1. RPC Photonics工程漫射体结构及光束投射形状
_IxYnm`pc Z%I 'sWOd {Rxb_9 步骤 {Ov{O,c5
PCc{0Rp\vk 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。 j/ARTaO1]" aE:$ N#|Qa 图2. RPC Photonics工程漫射体不同类型的散射数据
fP( n 3Q 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) pd.pY*B<[ 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 l
u{6 例如下所示: ?4W6TSW-' Sample name: EDF-C1-56 CzDg?w b Merging data from file EDF-C1-56 0-0.txt n5fc_N/8O= Finished merging RPC data for sample EDF-C1-56 @lh]?|*[ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt <]`|HJoy 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ^Vc(oa&; a. 创建一个新的散射库 SU~ljAF4 b. 散射模型命名 k$7Kz" c. 改变散射模型为“Tabulated BSDF”. 4a.8n!sys d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) {
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}}l e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 {HVsRpNEf f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, DsHm,dZ g. 点击OK zrC1/%T 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [raj:
7yQ I "R<XX m'ZxmsFo 脚本代码: zItGoJu P}!pmg6V '#Language "WWB-COM" G*zhy!P UH5A;SrTqR Option Explicit 7Mh!@Rd_V "1Y DT-I" Sub Main Vk1 c14i> bWZzb& 'Cleanup H]{`q ClearOutputWindow() %=vU
Z4 ]==S?_.B3n Print "Merging RPC Photonics BSDF Data Files" O&dh< SetTextColor(255,0,0) gm: xtN Print "Note: Script should be located in the same folder as the BSDF TXT files." O%} hNTS" Print "Note: Do not run this script multiple times without deleting the output file between executions." xu'b@G}12 SetTextColor(0,0,0) {]7lh#M 3#`Sk`z< 'Current directory of this script (should be the same as the text files being merged) *E/CNMn=E Dim cDir As String ;T>. cDir = MacroDir$ & "\" J$yJ2G R]S!PSoL 'Array which will be populated with the list of files to be merged a{kLAx[> Dim fList() As String, curFile As String ~(.&nysZ- GetFileList( cDir, fList ) d}^hZ8k| ofCN[u Print "" qcBamf Print "Files found for merging:" G8b`>@rZ For Each curFile In fList [O3)s] | Print Chr(9) & curFile &&sm7F% Next
X;dUlSi ~=$d>ZNQ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ,e*WJh8k[ Dim nameArray() As String, sampName As String msZ3%L nameArray = Split(fList(0)," 0-0.txt") i6:O9Km sampName = nameArray(0) UJGmaE Print "" nF{>RD Print "Sample name: " & Chr(9) & sampName pt8#cU\ Kw,ln<)2 'Open an output file and write the FRED header data iuWw(dJk Dim outFile As String >s"kL^ outFile = cDir & sampName & "_FRED.txt" ? p^ ':@= Open outFile For Output As #1 Y'M}lv$sa Print #1, "type bsdf_data" /lN09j Print #1, "format angles=deg bsdf=value scale=1" cUM#|K#6 UQ)7uYQ5 'Loop the file list, skip the two header lines and write the remaining data to file 0+"P1/ Dim lineArray() As String, curLine As Long 3|.KEJC" For Each curFile In fList u"M^qRhD Print "Merging data from file " & curFile ?&r>`H E ReadFile( cDir & curFile, lineArray ) _JXb|FIp For curLine = 2 To UBound(lineArray) S:xG:[N@ Print #1, lineArray(curLine) &?B\(?* Next Ov8{ny Next ^W<uc :L7 y{1|@?ii 'Close the output file KiG/XnS Close #1 E9n7P'8 ;gv9J[R Print "Finished merging RPC data for sample " & sampName d#wK Print "FRED formatted data file: " & Chr(9) & outFile NpF}~$2 End Sub Q5qQ%cu _K|513I 'Utility function to read the contents of a file into an array of strings. N^&T5cAC Function ReadFile(ByVal fileName As String, _ y5bELWA ByRef lineArray() As String) As Long 0qMf6 {"w4+m~+te ReadFile = -1 Vch!&8xii Dim oFSO As Object Z
)dz Set oFSO = CreateObject("Scripting.FileSystemObject") p3(&9~s Erase lineArray gEQevy`T%c $2\k| @)s Dim fid As Long ce P1mO If oFSO.fileexists( fileName ) Then I@9k+JB fid = FreeFile()
'HDbU#vD Open fileName For Input As fid -QUvd1S40 lineArray = Split(Input(LOF(fid), fid), vbCrLf) {BKr/) H Close fid Ws(#ThA End If SgocHpyg Set oFSO = Nothing Oy/+uw^ Return UBound( lineArray ) r)SwV!b =1Mh%/y End Function -KG3_k E :X;AmLf`2u Sub GetFileList( ByVal in_dir As String, _ U
i ~*] ByRef in_flist() As String ) b bO1`b- I7nZ9n|KU 'Redimension the file list array y-c2tF@'v Erase in_flist 7T3ub3\ ]1<O [d 'Tracks how many files are found H:HJHd"W Dim fCount As Long H|iY<7@ fCount = 0 *m[ow s zWh[U'6 'Recurse directory and search for text files -dn\*n5 Dim f As String hup<U+p f = Dir$(in_dir & "*.txt") 9
6'{ES9D While f <> "" Y SE6PG ReDim Preserve in_flist(fCount) Zu/}TS9bi in_flist(fCount) = f *r k!`n& fCount += 1 N yK7TKui f = Dir$() Q0j$u[x6s Wend Q+\?gU] ReDim Preserve in_flist(fCount-1) yS[Z%]bvU -v(.]`Wo&; End Sub l;dZJ_Ut$ kt; |
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