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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。 .A(i=!{q jQ?LHUE 背景: 3?@?-q2g 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。 Z^*NnL.' 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。 Z["BgEJ 图1. RPC Photonics工程漫射体结构及光束投射形状
i|S:s K^aj@2K{ >ukQ, CE~ 步骤 5/ * >v
d/]|657u 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。 +}U2@03I ~p\n&{P0 图2. RPC Photonics工程漫射体不同类型的散射数据
r1;e 0\?` 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) ETO$9}x[ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 1[s0Lz 例如下所示: g_vm&~U/' Sample name: EDF-C1-56 O#:&*Mv Merging data from file EDF-C1-56 0-0.txt \_9rr6^" Finished merging RPC data for sample EDF-C1-56 e #M iaX FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4jGLAor| 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 oNIFx5*Z a. 创建一个新的散射库 U-g9C. b. 散射模型命名 m2 O&2[g c. 改变散射模型为“Tabulated BSDF”. 3cixQzb}u d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 3;l "=#5 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 W Y:s
gG f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, B.*"Xfr8 g. 点击OK K&dT(U 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )7Ixz1I9g Xa,\EEmQ bi$VAYn.^ 脚本代码: f-D>3qSS +s~.A_7) '#Language "WWB-COM" ^A!$i$NON o @KW/RN" Option Explicit 'zxoRc-b@N utH%y\NMF| Sub Main
%w5[*V /M@PO" 'Cleanup 6/1$<!WH ClearOutputWindow() Pl78fs"L@ ~O03Sit- Print "Merging RPC Photonics BSDF Data Files" -DCa
SetTextColor(255,0,0)
RJ}#)cT Print "Note: Script should be located in the same folder as the BSDF TXT files." h1f8ktF Print "Note: Do not run this script multiple times without deleting the output file between executions." ]JMl|e SetTextColor(0,0,0) #epy%> 5I' d PNf 'Current directory of this script (should be the same as the text files being merged) p3yU:q#A Dim cDir As String S
GM!#K cDir = MacroDir$ & "\" 1'O0`Me># CVQB"L 'Array which will be populated with the list of files to be merged E\$C/}T Dim fList() As String, curFile As String $Q/Ya@o GetFileList( cDir, fList ) 0+ `Pg h}&b+1{X Print "" ; LMWNy4 Print "Files found for merging:" t&}6;z 3 For Each curFile In fList Yb:pAzw6 Print Chr(9) & curFile _Y!sVJ){,c Next E FY@Y[ kg>>D 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. /!T> b:0 Dim nameArray() As String, sampName As String Z<"K_bj nameArray = Split(fList(0)," 0-0.txt") 4l @)K9F sampName = nameArray(0) |/T43ADW Print "" fdv`7u+}a Print "Sample name: " & Chr(9) & sampName ROdK8*jL A-uB\ L 'Open an output file and write the FRED header data n:4uA`Vg Dim outFile As String v(O=IUa outFile = cDir & sampName & "_FRED.txt" 8l>CR#%@C Open outFile For Output As #1
4["&O=:d Print #1, "type bsdf_data" xs!p| Print #1, "format angles=deg bsdf=value scale=1" X?o(
b/F- !'0S0a8 'Loop the file list, skip the two header lines and write the remaining data to file Xy7Z38G Dim lineArray() As String, curLine As Long P8I*dvu _ For Each curFile In fList |d}MxS`^ Print "Merging data from file " & curFile \40YGFO ReadFile( cDir & curFile, lineArray ) c/aup For curLine = 2 To UBound(lineArray) 0rE(p2 Print #1, lineArray(curLine) )/|6'L-2 Next JTW)*q9a Next 6`\ya@ 2]WE({P 'Close the output file P Sx304 Close #1 \Fb| {6+ R_kQPP Print "Finished merging RPC data for sample " & sampName i8PuC^] Print "FRED formatted data file: " & Chr(9) & outFile uk7'K 0j End Sub -<f;l_( %XTA;lrz 'Utility function to read the contents of a file into an array of strings. jirbUl Function ReadFile(ByVal fileName As String, _ Wa'sZ# ByRef lineArray() As String) As Long {9 PR()_ *fc-gAj ReadFile = -1 %fjuG Dim oFSO As Object %0-wpuHc(] Set oFSO = CreateObject("Scripting.FileSystemObject") L%cVykWY" Erase lineArray >e&