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摘要: RG:_:%@%} 4o<'
fY 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。 up2wkc8 !+(H(,gI 背景: F#a'N c9 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。 +S@[1 N 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。 cH6J:0>W 图1. RPC Photonics工程漫射体结构及光束投射形状 eC`G0.op H3+P;2{ w d6+,B 步骤 oB+Ek~{z] |%@pjJ`3 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。 DDe`Lb%% 0~BZh%s< ( 图2. RPC Photonics工程漫射体不同类型的散射数据 XA\wZV
|{ 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) Bh;N:{&^Eu 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 @PV3G
KJ 例如下所示: {J-Ojw|Y b Sample name: EDF-C1-56 i93^E~q] Merging data from file EDF-C1-56 0-0.txt EZ[e
a< Finished merging RPC data for sample EDF-C1-56 KebC$g@W FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt f1q0*)fk 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 _|7bpt9 a. 创建一个新的散射库 o\X|\nUk b. 散射模型命名 d
9]zB-A c. 改变散射模型为“Tabulated BSDF”. >aT~G!y d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) hbm#H7Y e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 nnCz!:9p f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ?~ <NyJHN% g. 点击OK u<EPK*O* 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6S^JmYq =m6<H Wa9yyc 脚本代码: i4mP*RwC /|@~:5R5H '#Language "WWB-COM" ]xPy-j6C i<*W,D6
Option Explicit cG{ 6foiN W+ Sub Main r-,u)zf" \pXo~;E\ 'Cleanup 0F 6~S ClearOutputWindow() @4$la'XSx .:=5|0m Print "Merging RPC Photonics BSDF Data Files" )B"E+Q'h{7 SetTextColor(255,0,0) XRi37|p Print "Note: Script should be located in the same folder as the BSDF TXT files." A}i>ys Print "Note: Do not run this script multiple times without deleting the output file between executions." _7
^:1i~:. SetTextColor(0,0,0) fDAT#nlyp g#o9[su 'Current directory of this script (should be the same as the text files being merged) ,;n[_f Dim cDir As String Jt3*(+J>/ cDir = MacroDir$ & "\" :VE0eJ]J6 mt4X 'Array which will be populated with the list of files to be merged Z61L;E Dim fList() As String, curFile As String f<>CSjQ4c GetFileList( cDir, fList ) sU/vXweky" R#!Urhh Print "" WQMoAPfqL Print "Files found for merging:" T-Yb|@4 For Each curFile In fList bd[iD?epD] Print Chr(9) & curFile b{;LbHq+G Next 2yVQqwQm PoD/i@ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ;f
/2u Dim nameArray() As String, sampName As String Zi<(>@z2 nameArray = Split(fList(0)," 0-0.txt") on
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$n7 sampName = nameArray(0) )NO,G Print "" dv?t;D@p! Print "Sample name: " & Chr(9) & sampName XI"IEwB zpg512\y 'Open an output file and write the FRED header data
M,we,!B0 Dim outFile As String rVwW%& outFile = cDir & sampName & "_FRED.txt" A@e!~ Open outFile For Output As #1 j|@8VxZ Print #1, "type bsdf_data" #I#_gjJkx Print #1, "format angles=deg bsdf=value scale=1" @_?Uowc8 @{ L|&Mk! 'Loop the file list, skip the two header lines and write the remaining data to file YTg8Zg-Z Dim lineArray() As String, curLine As Long dRUmC H For Each curFile In fList k0D): Print "Merging data from file " & curFile v!AfIcEV ReadFile( cDir & curFile, lineArray ) [d=BN ,? For curLine = 2 To UBound(lineArray) #4V->I Print #1, lineArray(curLine) ~J
>Jd Next 3?TUt{3g Next sn+ kFvk}S f6m
h_l 'Close the output file B/B`=%~5_^ Close #1 -c#vWuLl _~;K] Print "Finished merging RPC data for sample " & sampName F(w<YU%6 Print "FRED formatted data file: " & Chr(9) & outFile cL4Xh|NBp End Sub yF-`f
_ QV
-ZP'e^ 'Utility function to read the contents of a file into an array of strings. $5@[l5cJU; Function ReadFile(ByVal fileName As String, _ 0>
QqsQ ByRef lineArray() As String) As Long dJ~Occ 1~r xu>grj ReadFile = -1 lU`t~|>r+ Dim oFSO As Object uEkGo5 Set oFSO = CreateObject("Scripting.FileSystemObject")
I p|[ Erase lineArray ek d[|g /< Dtu UM Dim fid As Long QiaBZAol If oFSO.fileexists( fileName ) Then gFXz:!A fid = FreeFile() )Jh:~9L%=' Open fileName For Input As fid >^g\s]c[ lineArray = Split(Input(LOF(fid), fid), vbCrLf) $<L@B|}F) Close fid %0vWyU:K9 End If ycf)*0k Set oFSO = Nothing [S0wwWU |0 Return UBound( lineArray ) +kq+x6& $ )6x3&]P End Function 8J~-|<Q6 6Q_ZP#oAV Sub GetFileList( ByVal in_dir As String, _ vZPBjloT!. ByRef in_flist() As String ) I(j$^DA. "O_)~u 'Redimension the file list array f,Am;:\ | Erase in_flist !1l~'/r v3wq- 'Tracks how many files are found O"wo&5b_ Dim fCount As Long m14'u GC fCount = 0 CW FE{ %0'7J@W 'Recurse directory and search for text files Rpj{!Ia Dim f As String Sx1OY0)s f = Dir$(in_dir & "*.txt") z~ua#(z1S While f <> "" GQ sE5Vb ReDim Preserve in_flist(fCount) p+-IvU in_flist(fCount) = f /)sP<WPQ6 fCount += 1 KfQ?b_H. f = Dir$() D#[<N Wend B/Ltb^a ReDim Preserve in_flist(fCount-1) YR[I,j cGlpJ)'-{ End Sub NTVaz.
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