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摘要: CrTGC%w{= J|'e.1v 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。 ?zS
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背景: sKIpL(_I$ 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。 /:<.Cn>- 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。 1@i 8ASL 图1. RPC Photonics工程漫射体结构及光束投射形状 Z'u:Em | e&v;48 31FQ=(K 步骤 o3s ME2 8J5{}4s\f 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。 0EA<ip RD$"ft]Vc 图2. RPC Photonics工程漫射体不同类型的散射数据 ^")SU(` 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) MO1t0My c 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7aV(tMzd 例如下所示: BLno/JK0} Sample name: EDF-C1-56 .b3cn Merging data from file EDF-C1-56 0-0.txt e>GX]tK Finished merging RPC data for sample EDF-C1-56 dx<KZR$!V FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt )q+Qtz6D 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 SLj2/B0 a. 创建一个新的散射库
Z>O2 b. 散射模型命名 F74^HQ*J c. 改变散射模型为“Tabulated BSDF”. `.0WK 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 ) SccaX
P 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。 s}O9[_v 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 }^ylm g. 点击OK qMHI-h_A 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 IM^K]$q$47 xDJs0P4 ]V `L\ 脚本代码: LKEf#mp u4W2{ '#Language "WWB-COM" ;q3"XLV(T[ 2G(RQ\Ro* Option Explicit KA"D2j9wn 03{pxI Sub Main +O2z&a;q e*zt;SR 'Cleanup ,[Bv\4Ah ClearOutputWindow() a$~pAy5C t/3t69 \x Print "Merging RPC Photonics BSDF Data Files" &'0|U{| SetTextColor(255,0,0) _xyq25/ Print "Note: Script should be located in the same folder as the BSDF TXT files." 3=)!9;uY Print "Note: Do not run this script multiple times without deleting the output file between executions." hm&cRehU SetTextColor(0,0,0) ~0^d-,ZD5 v&8%t 7| 'Current directory of this script (should be the same as the text files being merged) N
N1(f Dim cDir As String :M |<c9I
cDir = MacroDir$ & "\" ;;3oWsil} 7a0kat'\ 'Array which will be populated with the list of files to be merged xv+47.?N Dim fList() As String, curFile As String E &wz0d;gf GetFileList( cDir, fList ) zS6oz= ]{/1F:bcQ Print "" qkLp8/G>pO Print "Files found for merging:" j~'a %P For Each curFile In fList C.& R,$ Print Chr(9) & curFile 0+vt LDq@P Next o~(/Twxam : }q~< 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. #7Pnw.s3zz Dim nameArray() As String, sampName As String -VOMt5u nameArray = Split(fList(0)," 0-0.txt") &azy1.i~ sampName = nameArray(0) j&c YRKpz Print "" 3G;#QK-c Print "Sample name: " & Chr(9) & sampName |P>Yf0 v{T%`WuPRf 'Open an output file and write the FRED header data (sfy14>\ Dim outFile As String 9c}mAg4 outFile = cDir & sampName & "_FRED.txt" 5N_w(B Open outFile For Output As #1 z"vI-~,YU Print #1, "type bsdf_data" o-f;$]yp> Print #1, "format angles=deg bsdf=value scale=1" kw gsf5[ UrP jZ:K' 'Loop the file list, skip the two header lines and write the remaining data to file T"tR*2HwSd Dim lineArray() As String, curLine As Long >p[skN For Each curFile In fList }+F&=-P) Print "Merging data from file " & curFile /4!.G#DLQ ReadFile( cDir & curFile, lineArray )
^tFbg+. For curLine = 2 To UBound(lineArray) p /x] Print #1, lineArray(curLine) ]8c%)%Vi Next I_k!'zR[N Next Vp.&X 8 y-/,,,r 'Close the output file 0<n*8t?A- Close #1 PE\.J U uDWxIP,m Print "Finished merging RPC data for sample " & sampName DA(ur'D Print "FRED formatted data file: " & Chr(9) & outFile v"K # End Sub .C=I~Z ]((Ix,ggP 'Utility function to read the contents of a file into an array of strings. xeGl}q| Function ReadFile(ByVal fileName As String, _ :CR1Oy 9 ByRef lineArray() As String) As Long WA$Ug _>LI[yf{ ReadFile = -1 {+SshT>J Dim oFSO As Object B9[eLh! Set oFSO = CreateObject("Scripting.FileSystemObject") ayR;|S Erase lineArray L#}HeOEi[ 8=Z]?D= Dim fid As Long w~n7l97Pw If oFSO.fileexists( fileName ) Then ] C&AU[U* fid = FreeFile() 6iZ:0y0t+6 Open fileName For Input As fid t'.oty= lineArray = Split(Input(LOF(fid), fid), vbCrLf) {=q$k=ib Close fid nB+UxU@ End If -<jd/ 5 Set oFSO = Nothing ~dm/U7B: Return UBound( lineArray ) uHNh|ew21 l"ZfgJ}W End Function ,o{|W9 D#pZN,' Sub GetFileList( ByVal in_dir As String, _ r@.3.Q ByRef in_flist() As String ) |
WN9& yE6EoC^ 'Redimension the file list array B/n/bi8T Erase in_flist {Iu9%uR>@ (X(296<; 'Tracks how many files are found L(
B(x>w Dim fCount As Long iax6o+OG| fCount = 0 YM(`E9{h ,];4+&|8kW 'Recurse directory and search for text files ,;)1|-^nu Dim f As String `Qrrnq f = Dir$(in_dir & "*.txt") G=Qslrtg While f <> "" -l ?J ReDim Preserve in_flist(fCount) `~.0PnHf in_flist(fCount) = f TX%W-J_ fCount += 1 [:MpOl-KIz f = Dir$() fK'qc L Wend eT4+O5t ReDim Preserve in_flist(fCount-1) {Y p;R |}O9'fyU8 End Sub MUs~ZF DOzJ-uww1 R06zca QQ:2987619807 Kr*s]O
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