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摘要: :[l\@>H1tX 6IcNZ!j98 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。 u{<"NR h 3VO2,PCZ 背景: (!L5-8O 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<}xO 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。 YIRZ+H<Q 图1. RPC Photonics工程漫射体结构及光束投射形状 !^oV # hZXXBp =T?}Nt 步骤 "r4AY - YqYcer 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。 N"tFP9;K H`hnEOyLp 图2. RPC Photonics工程漫射体不同类型的散射数据 DTRJ/@t 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) Vv.r8IGYm 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 S[3iA~)Z- 例如下所示: K)tQ]P Sample name: EDF-C1-56 HSUI${< Merging data from file EDF-C1-56 0-0.txt tC?=E#3V Finished merging RPC data for sample EDF-C1-56 6RO(]5wX FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt f"[J"j8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #p(h]T32 a. 创建一个新的散射库 B Xms;[ b. 散射模型命名 Kb#4ILA c. 改变散射模型为“Tabulated BSDF”. !LMN[3M_ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) &F:IIo7 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 p@!nYPr. f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, `_I@i]i^ g. 点击OK Y_&g="`Q 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2,2Z`X !)"%),>}o 1/1Xk,E 脚本代码: }"vW4 {R<Ea
@LV+ '#Language "WWB-COM" =uk0@hy9b z<sg0K8z63 Option Explicit H`bSYjgM! EC2+`HJ" Sub Main n9w9JXp;! G@FI0\t 'Cleanup 6oaazB^L ClearOutputWindow() omO
S=d!o y.5/?{GL Print "Merging RPC Photonics BSDF Data Files" ?_x
q- SetTextColor(255,0,0) 6=4wp? Print "Note: Script should be located in the same folder as the BSDF TXT files." ^'CPM6J Print "Note: Do not run this script multiple times without deleting the output file between executions." jUv!9Y}F SetTextColor(0,0,0) >^q7c8]~g f0<hE2 'Current directory of this script (should be the same as the text files being merged) )[H{yQ Dim cDir As String MObt,[^W cDir = MacroDir$ & "\" rk+#GO{ WV3|?,y]qm 'Array which will be populated with the list of files to be merged \P} p5k[ Dim fList() As String, curFile As String /kL$4CA GetFileList( cDir, fList ) qPB8O1fyU E J$36 Print "" q{s(.Uq$& Print "Files found for merging:" C{sLz9 For Each curFile In fList 8h3=b[ Print Chr(9) & curFile ]2# Next :tIC~GG]_) ur
:i)~wXn 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. t*@2OW`! Dim nameArray() As String, sampName As String ~$'\L nameArray = Split(fList(0)," 0-0.txt") tQZs.1=z sampName = nameArray(0) rG#Z=*b% Print "" D3|oOOoG Print "Sample name: " & Chr(9) & sampName A(?\>X
9g JdIlWJY 'Open an output file and write the FRED header data 4h@Z/G!T3 Dim outFile As String .s#;s'>g outFile = cDir & sampName & "_FRED.txt" &_JD)mM5 Open outFile For Output As #1 k(zsm"<q Print #1, "type bsdf_data" `D9]*c
!mO Print #1, "format angles=deg bsdf=value scale=1" W_m"ySQs vN2u34 'Loop the file list, skip the two header lines and write the remaining data to file [:xiZ Dim lineArray() As String, curLine As Long &]
\X]p For Each curFile In fList iX0iRC6f Print "Merging data from file " & curFile [V4 {c@ ReadFile( cDir & curFile, lineArray ) : ^ 8 For curLine = 2 To UBound(lineArray) MCU_Z[N#10 Print #1, lineArray(curLine) 66^ycZCH Next 763+uFx^ Next e]jH+IR:> [((;+B 'Close the output file 8$(Dz]v|[& Close #1 {]"]uT# ; 7N
Z<k Print "Finished merging RPC data for sample " & sampName D")_;NLE1 Print "FRED formatted data file: " & Chr(9) & outFile \~LQ%OM End Sub V([~r,
#gm)dRKm% 'Utility function to read the contents of a file into an array of strings. 5{n*"88 Function ReadFile(ByVal fileName As String, _ piU/& ByRef lineArray() As String) As Long 3Tn)Z1o Cy*|&=>j ReadFile = -1 qlA7tU2p& Dim oFSO As Object <hwy*uBrD Set oFSO = CreateObject("Scripting.FileSystemObject") (`? y2n)~W Erase lineArray rP!#RzL s7oT G! Dim fid As Long bT
2a40ul If oFSO.fileexists( fileName ) Then upeU52@\ fid = FreeFile() Q}S_%I}u: Open fileName For Input As fid ^
wY[3"{ lineArray = Split(Input(LOF(fid), fid), vbCrLf) [`]4P& Close fid _|"Y]:j_ End If b)9'bJRvU Set oFSO = Nothing )5|I_PXB Return UBound( lineArray ) C/(M"j M c)@>zto# End Function S1/`th _ Ro!"YVX Sub GetFileList( ByVal in_dir As String, _ ho>k$s? ByRef in_flist() As String ) M-i_#EWP z<.?x%4O 'Redimension the file list array }E`dZW*!! Erase in_flist _-5,zPR 7Sz?S_N/j 'Tracks how many files are found *6 _tQ9G Dim fCount As Long J)mhu} fCount = 0 \6;=$f/?t K-&V,MI 'Recurse directory and search for text files J[^}u_z Dim f As String o!4!"O'E f = Dir$(in_dir & "*.txt") _gD
pKEaY While f <> "" Jv.UQ ReDim Preserve in_flist(fCount) gIA@l`" in_flist(fCount) = f d~h:~ fCount += 1 V21njRS f = Dir$() 3BpZX`l*p Wend :_Eqf8T ReDim Preserve in_flist(fCount-1) Agrp(i"\@ D5~n/.B" End Sub waKT{5k
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