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摘要: l6z}D;4 /^^wHW: 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。 _YPu Y2 QX9RN 背景: kD{qW=Lpn 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。 ,I^:xw_ 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。 e0cVg 图1. RPC Photonics工程漫射体结构及光束投射形状 qdY*y&}"J iW$f1=i ZgH(,g,TU 步骤 Hy|
X>Z 4!)=!sL; 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 _+NM<o#A 2GW.'\D 图2. RPC Photonics工程漫射体不同类型的散射数据 ML-?#jNa< 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) lN,)T%[0- 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ,d~6LXr<fM 例如下所示: 6>R|B?I% Sample name: EDF-C1-56 d^W1;0 Merging data from file EDF-C1-56 0-0.txt y>jP]LR4 Finished merging RPC data for sample EDF-C1-56 ,,o5hD0V9 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt b@
S. 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *C"-$WU3o a. 创建一个新的散射库 zM+eb| >cr b. 散射模型命名 D5gDVulsh
c. 改变散射模型为“Tabulated BSDF”. )"4v0dv 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 ) Z&[_8Y5j 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$%1j+%& 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, N "Mw1R4 g. 点击OK DF`?D
+ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^mZ eAW v>oWk:iJP >2[nTfS 脚本代码: f\]splL pxgVYr. '#Language "WWB-COM" Wv4o:_} d&apu{ Option Explicit h.WvPZ2U /hksESiU Sub Main GT3?)g{Z &>$+O>c , 'Cleanup w(-h!d51+ ClearOutputWindow() {j!+\neL 3sF^6<E Print "Merging RPC Photonics BSDF Data Files" o b,%); m SetTextColor(255,0,0) ?X5Y8n]y\h Print "Note: Script should be located in the same folder as the BSDF TXT files." b<1+q{0r Print "Note: Do not run this script multiple times without deleting the output file between executions." d@aPhzLu SetTextColor(0,0,0) "B"Yfg[ 8\])p sb9 'Current directory of this script (should be the same as the text files being merged) T**v!Ls Dim cDir As String l:$i}.C cDir = MacroDir$ & "\" ~f5g\n; 5kbbeO|0G 'Array which will be populated with the list of files to be merged U2TR>0l Dim fList() As String, curFile As String H\!p%Y GetFileList( cDir, fList ) M*n@djL$\~ 4t e QG Print "" SG@-b( Print "Files found for merging:" I`-N]sf^ For Each curFile In fList \#O}K Print Chr(9) & curFile C0v1x=(xiM Next Ap)[;_9BD jSc!"Trl] 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5@&{%99 Dim nameArray() As String, sampName As String ^P p2T nameArray = Split(fList(0)," 0-0.txt") BfUM+RC%5 sampName = nameArray(0) M`u&-6 Print "" c4i%9E+Af Print "Sample name: " & Chr(9) & sampName ]R?{9H|jwE "Di8MMGOY 'Open an output file and write the FRED header data yuA+YZ Dim outFile As String TVs#, outFile = cDir & sampName & "_FRED.txt" 7>,(QHl Open outFile For Output As #1 14Y<-OO:
k Print #1, "type bsdf_data" & cV$`L Print #1, "format angles=deg bsdf=value scale=1" yMVlTO (Xv'Te? 'Loop the file list, skip the two header lines and write the remaining data to file {2,vxGi Dim lineArray() As String, curLine As Long YggeKN For Each curFile In fList _`- trE. Print "Merging data from file " & curFile &Ay[mZQ 7 ReadFile( cDir & curFile, lineArray ) 'ugc=-0pd For curLine = 2 To UBound(lineArray) ;:DDz Print #1, lineArray(curLine) 6#gS`X23Y Next t]14bf$*Q Next lNRGlTD% 2*)2c[/0F 'Close the output file Svqj@@_f Close #1 F)n^pT |x#w8=VP- Print "Finished merging RPC data for sample " & sampName jRGslak; Print "FRED formatted data file: " & Chr(9) & outFile d":GsI?3 End Sub OAw- -rl X"Ca 'Utility function to read the contents of a file into an array of strings. e !2SO*O Function ReadFile(ByVal fileName As String, _ ~H4wsa39 ByRef lineArray() As String) As Long M%(^GdI#Vf "\`>Ll ReadFile = -1 Wb{0UkApJ Dim oFSO As Object 4}xw&x Set oFSO = CreateObject("Scripting.FileSystemObject") 19j"Zxdg Y Erase lineArray iKM!>Fi >K;DBy* Dim fid As Long a2%xW_e If oFSO.fileexists( fileName ) Then @^cR fid = FreeFile() wSd|-e Open fileName For Input As fid A29R5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1Wr,E#+C Close fid &m=73RN End If !fmbm4!a
Set oFSO = Nothing KBOp}MEz Return UBound( lineArray ) H~:EPFi.( a${<~M
hm End Function wG@f~$ 6"YcM:5~ Sub GetFileList( ByVal in_dir As String, _
YG_|L[/# ByRef in_flist() As String ) PrqyJ hZ`<ID 'Redimension the file list array /N9ct4 {^ Erase in_flist ;_p$5GVR| Rl{e<>O\^ 'Tracks how many files are found v8l3{qq Dim fCount As Long K
7OIT2- fCount = 0 N@#,Y nPI U[EZ,7n8 'Recurse directory and search for text files 8}K^o>J&K Dim f As String :Xi&H.k)p f = Dir$(in_dir & "*.txt") NH'Dz6K5 While f <> "" G_]zymXQ ReDim Preserve in_flist(fCount) 'W*:9wah in_flist(fCount) = f 10d.&vNw fCount += 1 G
_-JR f = Dir$() 4G2iT+X- Wend %E2b{Y; ReDim Preserve in_flist(fCount-1) ("KtJ <&RpGAk%I End Sub {/}%[cY=
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