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摘要: {(F}SF{ 5RO6YxQ 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。 .9g :-hv .Q@]+&`|}i 背景: &pz`gna 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。 eDNY|}$}v FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
k6@ 图1. RPC Photonics工程漫射体结构及光束投射形状 egfd=z=2un PV=sqLM~ _:Y|a> 步骤 QP!;Gwqr OzRo 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 m%"=sX7/9 #%OS=.V 图2. RPC Photonics工程漫射体不同类型的散射数据 }
MP_ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) g}9heR 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 SjJ$Oinc 例如下所示: F60m]NUM)c Sample name: EDF-C1-56 0CX9tr2J Merging data from file EDF-C1-56 0-0.txt l 8GAZ*+ Finished merging RPC data for sample EDF-C1-56 c1*^
\ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7Ot&]M 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PqyR,Bcx0 a. 创建一个新的散射库 Xfg?\j/ b. 散射模型命名 D`B*+ c. 改变散射模型为“Tabulated BSDF”. Ln\Gv/) 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 ) a~-k} G5 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。 ?&U~X)Q 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, R \y
qM;2 g. 点击OK dOgc%(kz 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Yc5)
^v .)FFl ;\/RgN 脚本代码: w0<1=;_% LR"7e '#Language "WWB-COM" }1sd<<\` f=4q]y#& X Option Explicit HGj[\kU~ 6-{wo)p Sub Main "88<{x L %]F{aR 'Cleanup b|@f!lA ClearOutputWindow() $KGRpI UM+g8J{$*; Print "Merging RPC Photonics BSDF Data Files" 10_@'N SetTextColor(255,0,0)
/zir$ Print "Note: Script should be located in the same folder as the BSDF TXT files." c+1<3)Q< Print "Note: Do not run this script multiple times without deleting the output file between executions." %IUTi6P
l SetTextColor(0,0,0) GN|xd+O_ }.<]A 'Current directory of this script (should be the same as the text files being merged) dFnu&u" Dim cDir As String ;,B $lgF cDir = MacroDir$ & "\" vFgnbWxG x$bCbg 'Array which will be populated with the list of files to be merged U
owbk: Dim fList() As String, curFile As String XJ7mvLM; GetFileList( cDir, fList ) ITU6Eq oi^pU Print "" ;@[ax{ J Print "Files found for merging:" N#X(gEV For Each curFile In fList %#lJn.o Print Chr(9) & curFile \e?w8R.6w^ Next QUc&f+~ YJ 01- 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. k3e?:t 9 Dim nameArray() As String, sampName As String TaTw,K|/ nameArray = Split(fList(0)," 0-0.txt") 5jc y*G}[ sampName = nameArray(0) `g(r.`t^ Print "" $-mwr,i Print "Sample name: " & Chr(9) & sampName qI1JM = ;J?zD9 'Open an output file and write the FRED header data L' x[wM0w; Dim outFile As String <%LN3T outFile = cDir & sampName & "_FRED.txt" gG,gL9o Open outFile For Output As #1 m' L8z
fX Print #1, "type bsdf_data" SA-r61 Print #1, "format angles=deg bsdf=value scale=1" =>)4>WT8A 8lT2qqlr 'Loop the file list, skip the two header lines and write the remaining data to file e?XQ, Dim lineArray() As String, curLine As Long Lq5Eu$;r For Each curFile In fList C;eM:v0A[ Print "Merging data from file " & curFile o~p%ODH ReadFile( cDir & curFile, lineArray ) 1\if XJ For curLine = 2 To UBound(lineArray) "]1|%j Print #1, lineArray(curLine) VrZ6m Next 7?~*F7F Next w 8oIq* H=>;Mj 'Close the output file 9]*hP]( Close #1 Zd[6-/-: aQ.mvuMa7' Print "Finished merging RPC data for sample " & sampName aECQ(]q Print "FRED formatted data file: " & Chr(9) & outFile )R9QJSe End Sub c *]6>50 4qLH3I[Y 'Utility function to read the contents of a file into an array of strings. "_36WX Function ReadFile(ByVal fileName As String, _ p#fV|2'
ByRef lineArray() As String) As Long sRf?JyB pe7R1{2Q_s ReadFile = -1 #~@Cl9[)D Dim oFSO As Object ~;B@ {kFY) Set oFSO = CreateObject("Scripting.FileSystemObject") $tFmp) Erase lineArray lG!We'? LuUfdzH Dim fid As Long VT`C<' If oFSO.fileexists( fileName ) Then *Z=:?4u fid = FreeFile() dQH9NsV7g Open fileName For Input As fid XCU>b[Cj, lineArray = Split(Input(LOF(fid), fid), vbCrLf) ^bDh[O Close fid bpWEF b'f End If k_%"# Set oFSO = Nothing C*1,aLSw Return UBound( lineArray ) VsMTzGr vd}Y$X End Function 2 K&5Kt/ /qX=rlQ/ n Sub GetFileList( ByVal in_dir As String, _ )]a{cczL" ByRef in_flist() As String ) @
wJ|vW_. P% ZCACzV 'Redimension the file list array '-5Q>d~&h Erase in_flist %N
}0,a0 F8%.-.l) 'Tracks how many files are found )=c/{ Dim fCount As Long f)/5%W7n} fCount = 0 b63 tjqk ]M#OS$_O@ 'Recurse directory and search for text files EvEI5/z Dim f As String wnoL<p f = Dir$(in_dir & "*.txt") vfZ.js/ While f <> "" AUvUk<a ReDim Preserve in_flist(fCount) h1`u-tc2x in_flist(fCount) = f \9}RAr#2]N fCount += 1 mUW4d3tE f = Dir$() %uWq)D4r Wend eL7\})!W ReDim Preserve in_flist(fCount-1) */JMPw& .G|9:b End Sub #.kDin~! Nn%[J+F Sx", Zb QQ:2987619807 eURj'8o),
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