$3+PbYY 摘要: &sVvWNO#2 { >{B`e`$ 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。 7\
SUr9[ ~q +[<xR\ 背景: }A$WO{2 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。 wRNroQ 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。图1. RPC Photonics工程漫射体结构及光束投射形状 3B0lb"e 4IdT' i=FQGWAUu >n5:1.g 步骤 2i#Sn' 1 _#$9 y1bd 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。 0Sl]!PZR1 图2. RPC Photonics工程漫射体不同类型的散射数据 YMpf+kN =;~I_)Pg1 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) >ndJNinV 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 uv{P,]lK 例如下所示: =8G&3 R Sample name: EDF-C1-56 wYsZM/lw Merging data from file EDF-C1-56 0-0.txt tS# `.F~y Finished merging RPC data for sample EDF-C1-56 i@"e,7mSG FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5__+_hO
;3 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 |Yi)"- a. 创建一个新的散射库 /x@RNdKv b. 散射模型命名 iGXI6`F" c. 改变散射模型为“Tabulated BSDF”. T".]m7! 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 ) /BKe+]dS* 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。 9|'B9C 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, 8U2dcx:G3 g. 点击OK ZsP2>%" 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )YW<" $s :Gqy>)CxX DLE8+NV8
脚本代码: iyx>q!P e=P '#Language "WWB-COM" ~o3Hdd_#}N }7<5hn E Option Explicit lw%?z/HDf i hL/n Sub Main "GT4s?6O qf'm=efRyu 'Cleanup =x#FbvV ClearOutputWindow() JM$.O;y
- j{VGClb=T Print "Merging RPC Photonics BSDF Data Files" Weoj|0|t SetTextColor(255,0,0) 1tzV8(7 Print "Note: Script should be located in the same folder as the BSDF TXT files." ;_kzcK!l Print "Note: Do not run this script multiple times without deleting the output file between executions." rk2xKm^w SetTextColor(0,0,0) |Q~cX!; H Yr}wG 'Current directory of this script (should be the same as the text files being merged) p(SRjQt Dim cDir As String c2l_$p cDir = MacroDir$ & "\" H2gj=krK $Byj}^ ;1 'Array which will be populated with the list of files to be merged = 64r:E Dim fList() As String, curFile As String UAS@R`?cI GetFileList( cDir, fList ) T4e\0.If B=L&bx Print "" Q }k.JS~# Print "Files found for merging:" ~iBgw&Y For Each curFile In fList c{ZY,C&< Print Chr(9) & curFile ~Z/
^c,[: Next ".*x!l0y7 V5}nOGV9 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Zx }&c |Q Dim nameArray() As String, sampName As String "e3["' nameArray = Split(fList(0)," 0-0.txt") Myat{OF sampName = nameArray(0) f}c\_}( Print ""
gE/Tj$ Print "Sample name: " & Chr(9) & sampName ;.sl*q1A 4o:hyh 'Open an output file and write the FRED header data FX<b:# Dim outFile As String Wx'Kp+9' outFile = cDir & sampName & "_FRED.txt" p4> $z& _ Open outFile For Output As #1 u),Qa=Wp Print #1, "type bsdf_data" A?Q a 4i Print #1, "format angles=deg bsdf=value scale=1" Ey{%XR+*; l7(!`NPbC 'Loop the file list, skip the two header lines and write the remaining data to file $S*4r&8ZD Dim lineArray() As String, curLine As Long iJFs0?* For Each curFile In fList :m=m}3/: Print "Merging data from file " & curFile _;A $C( ReadFile( cDir & curFile, lineArray ) `pZs T
^G[ For curLine = 2 To UBound(lineArray) /76 1o\Q Print #1, lineArray(curLine) V+-$jOh Next aFiCZHohw Next ek aFN\ NBh%:tu7M 'Close the output file TfxwVPX Close #1 !;@_VWR h<l1]h+x Print "Finished merging RPC data for sample " & sampName t-u|U(n Print "FRED formatted data file: " & Chr(9) & outFile 3LR p2(A End Sub a>4uiFiv 9_ICNG% 'Utility function to read the contents of a file into an array of strings. :R6bq! Function ReadFile(ByVal fileName As String, _ c9' ' ByRef lineArray() As String) As Long +YOKA* kpwt]]e* ReadFile = -1 4W4kwU6D Dim oFSO As Object $m1<i?'m Set oFSO = CreateObject("Scripting.FileSystemObject") 1RLY $M Erase lineArray <O?y-$~ 6TWWlU^e Dim fid As Long AEmNHO@%q If oFSO.fileexists( fileName ) Then HWns.[ fid = FreeFile() <HWS:'1 Open fileName For Input As fid S,fCV~Cio? lineArray = Split(Input(LOF(fid), fid), vbCrLf) T&Xl'=/ Close fid |XYEn7^r End If y #f
QPR Set oFSO = Nothing =M 6[URZ Return UBound( lineArray ) Z!d7&T} ?B@;QjhjiJ End Function q:>^ "P{ -${DW^txMZ Sub GetFileList( ByVal in_dir As String, _ 9DQ)cy ByRef in_flist() As String ) Op.8a`XLt& D\~zS`} 'Redimension the file list array c97{Pu Erase in_flist uxn)R#? )'4P.>!!aQ 'Tracks how many files are found Zt
-1h{7 Dim fCount As Long Mvj;ic6iK fCount = 0 lA!"z~03* oq/G`{`\ 'Recurse directory and search for text files XKL3RMF9r Dim f As String M`,~ mU f = Dir$(in_dir & "*.txt") u*S=[dq While f <> "" .%BT,$1K ReDim Preserve in_flist(fCount) # M, 7 in_flist(fCount) = f !"Yj|Nu6 fCount += 1 h!@|RW&}qX f = Dir$() 0X8t>#uF Wend k;PAh>8 ReDim Preserve in_flist(fCount-1) |