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摘要: ^|gD;OED7O c7Jfo
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V 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。 J4"?D9T3G S8 .1%sw 背景: E:(DidSE@ 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。 c<fl6o) 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。 xim'TVwvC 图1. RPC Photonics工程漫射体结构及光束投射形状 f:bUM/Ud f0S$p
R Lk#8G>U 步骤 ?$J#jhR? 5bBY[qp 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。 sYE| $MhfGMk!' 图2. RPC Photonics工程漫射体不同类型的散射数据 rK(TekU 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ?g+uJf
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 L.X"wIs^ 例如下所示: '(fQtQ% Sample name: EDF-C1-56 j2^Vz{ Merging data from file EDF-C1-56 0-0.txt &!N9.e:-] Finished merging RPC data for sample EDF-C1-56 RA^6c![ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2Kwr=t 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 F}MjZZj(U= a. 创建一个新的散射库 =e*S h0dK b. 散射模型命名 C( wZjO?N c. 改变散射模型为“Tabulated BSDF”. "!,)Pv d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) `cgyiJ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 (}*1,N!# f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 4fSGc8 g. 点击OK Zm x[:- 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (_IP z)F eU(cn8/} q[}W&t, 脚本代码: ;V v.$mI cfSQqH '#Language "WWB-COM" n~_;tO w Dp5HZ> Option Explicit ?hBj q H'a6]
]2 Sub Main Tji* \<? N.'-9hv 'Cleanup Q{=DLm` ClearOutputWindow() _D"V^4^yqu 9w!PA-) L Print "Merging RPC Photonics BSDF Data Files" )kIZmQ|f1 SetTextColor(255,0,0) Fzmc#? Print "Note: Script should be located in the same folder as the BSDF TXT files." JO-FnoQK Print "Note: Do not run this script multiple times without deleting the output file between executions." s+0n0C SetTextColor(0,0,0) yByxy-~ tfIUH'Ez> 'Current directory of this script (should be the same as the text files being merged) 2=IZD `{! Dim cDir As String br;~}GR_h cDir = MacroDir$ & "\" s7?d_+O -J":'xCP! 'Array which will be populated with the list of files to be merged Q3<ctd\]Y Dim fList() As String, curFile As String aOhi<I`* GetFileList( cDir, fList ) p54e'Zb d~qZ;uw Print "" .k!<Oqa Print "Files found for merging:" |BEoF[1 For Each curFile In fList ;q?WU>c{? Print Chr(9) & curFile T-F8[dd^/ Next *JArR1J +?'a2pUS 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ^V0I!&7lx Dim nameArray() As String, sampName As String sjy/[.4- nameArray = Split(fList(0)," 0-0.txt") OE/r0C<& sampName = nameArray(0) ]u|5ZCv0 Print "" * `3+x Print "Sample name: " & Chr(9) & sampName e'X"uH Xt. +8}8b_bgH 'Open an output file and write the FRED header data B-p ]. Dim outFile As String NCp]!=uM; outFile = cDir & sampName & "_FRED.txt" /"@k_[O Open outFile For Output As #1 Lvb'qZ6n Print #1, "type bsdf_data" &ox5eX( Print #1, "format angles=deg bsdf=value scale=1" AzMX~cd U!b~vrr^ 'Loop the file list, skip the two header lines and write the remaining data to file a\m0X@Q Dim lineArray() As String, curLine As Long ;"2(e7ir For Each curFile In fList Wgm{
]9Q Print "Merging data from file " & curFile 1}q(Pn2 ReadFile( cDir & curFile, lineArray ) Bq~?!~\?. For curLine = 2 To UBound(lineArray) nNhb,J Print #1, lineArray(curLine) ZMEYF!jN Next lm8<0*;, Next ts &sr
>P}6/L 'Close the output file wV q4DE Close #1 OzV|z/R2' ]]hsLOM] Print "Finished merging RPC data for sample " & sampName <z QUa Print "FRED formatted data file: " & Chr(9) & outFile _|>bOI End Sub 4oPr|OKj{* b6^#{))" 'Utility function to read the contents of a file into an array of strings. Z8:'_#^@a[ Function ReadFile(ByVal fileName As String, _ ;y.<I& ByRef lineArray() As String) As Long <3 I0$?xL i9^m;Y)^I ReadFile = -1 Zr|\T7w 3 Dim oFSO As Object oz'^.+uvE Set oFSO = CreateObject("Scripting.FileSystemObject") m^;A]0h+ Erase lineArray |?LUt@r; ]GiDfYs7% Dim fid As Long K 5AArI If oFSO.fileexists( fileName ) Then uDMyO<\ fid = FreeFile() Bg}(Sy Open fileName For Input As fid n ==+NL lineArray = Split(Input(LOF(fid), fid), vbCrLf) oF.H?lG7` Close fid U=N]XwjVK< End If W;T(q~XK Set oFSO = Nothing d[&Ah~, Return UBound( lineArray ) i&Me7=~ XBos^Q End Function oN[#C>#( ~2}^
-, Sub GetFileList( ByVal in_dir As String, _ GD<pqm`vVY ByRef in_flist() As String ) H8$";T(I zfA"xD 'Redimension the file list array g?9%_&/})A Erase in_flist ~p$ncIr2Q 2KSt4oa 'Tracks how many files are found Y#fiJ Dim fCount As Long A[ N>T\ fCount = 0 z1LY|8$G }>m3V2>[ 'Recurse directory and search for text files {ud^+I& Dim f As String (^= Hq'D f = Dir$(in_dir & "*.txt") MJ~)CiKgN While f <> "" V2*m/JyeB ReDim Preserve in_flist(fCount) eo'C)j# U in_flist(fCount) = f DZ&AwF fCount += 1 6N'HXL UlQ f = Dir$() (N$$N:ac[t Wend vQL)I ReDim Preserve in_flist(fCount-1) 6 WEu(}= Xj;5i
Vq End Sub $:<G= >Av%[G5=h# Lz;E/a}s QQ:2987619807 -O>*`
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