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摘要: dDu8n+(8 L nYsB^Nr6 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。 8}M-b6RV HNUpgNi 背景: "?*B2*|}` 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。 oV/:T\Qn= 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。 ;B^ 9sr 图1. RPC Photonics工程漫射体结构及光束投射形状 SO|!x}GfI q1^bH6*fl tZXq<k9 步骤 YD9|2S!G q!10G 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。 "g5<j p 2%?Kc]JY9 图2. RPC Photonics工程漫射体不同类型的散射数据 9kzJ5} 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) G1
K@Ir< 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 g+j\wvx0 例如下所示: 1b=,lm Sample name: EDF-C1-56 SuR+Vv Merging data from file EDF-C1-56 0-0.txt ' Ig:- Finished merging RPC data for sample EDF-C1-56 /Moyn"Kj{ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt sC'PtFK8z 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 oA* 88c+{f a. 创建一个新的散射库 >qy$W4 b. 散射模型命名 Mdw"^x$7 c. 改变散射模型为“Tabulated BSDF”. eK[9wEdn d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) G_QV'zQ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 xeB-fy)5+ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ]>/oo =E g. 点击OK Fy*t[> 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GU0[K#% 79z/(T+ h1~/zM/` 脚本代码: eemC;JV % v8"Zru '#Language "WWB-COM" XI'.L ~ kp-`_sDg Option Explicit *L&|4|BF2 P6 7*-Ki Sub Main ;uho.)%N`F <CcSChCg 'Cleanup >~l^E!<i-u ClearOutputWindow() 7 \AoMk}
j.yh>"de Print "Merging RPC Photonics BSDF Data Files" V
7oE\cxr SetTextColor(255,0,0) >l b9 j> Print "Note: Script should be located in the same folder as the BSDF TXT files." sis1Dh9: Print "Note: Do not run this script multiple times without deleting the output file between executions." *`40B6dEr SetTextColor(0,0,0) Obx!>mI^6 )b~+\xL5J 'Current directory of this script (should be the same as the text files being merged) 2c'<rkA Dim cDir As String '};mBW4z cDir = MacroDir$ & "\" k5|GN Y6a qL?$u07<9' 'Array which will be populated with the list of files to be merged gg.lajX Dim fList() As String, curFile As String BZa`:ah~x GetFileList( cDir, fList ) -bgj<4R$p V$_.&S?(Y Print "" b
w! Print "Files found for merging:" R].xT-1 For Each curFile In fList Jsa;pG=3& Print Chr(9) & curFile OYfRtfE Next u}?|d8$h\ .)E1|U[L 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. q26qY5D Dim nameArray() As String, sampName As String NE><(02qW nameArray = Split(fList(0)," 0-0.txt") Eb8~i_B- sampName = nameArray(0) !TN)6e7`
Print "" Ekn3ODz, Print "Sample name: " & Chr(9) & sampName sD9OV6^{?K <OrQbrWQa 'Open an output file and write the FRED header data On(.(7sNc Dim outFile As String Q yhu=_& outFile = cDir & sampName & "_FRED.txt" Rw<O%i5/d Open outFile For Output As #1 ~ %Ij5PD Print #1, "type bsdf_data" zhe~kI Print #1, "format angles=deg bsdf=value scale=1" xJin%:O PB) vE 'Loop the file list, skip the two header lines and write the remaining data to file n0)y|B# Dim lineArray() As String, curLine As Long im9Pj b% For Each curFile In fList e35 ")z~ Print "Merging data from file " & curFile L/)eNZ ReadFile( cDir & curFile, lineArray ) E;YD5^B For curLine = 2 To UBound(lineArray) P=a&>i Print #1, lineArray(curLine) L=5Y^f'aU Next BO+to. Next %"e hZd0r Of-8n- 'Close the output file <.{OIIuk Close #1 7HJH9@8V s~A:*2 \ Print "Finished merging RPC data for sample " & sampName `,Fc271` Print "FRED formatted data file: " & Chr(9) & outFile Ev T"+;9/p End Sub O' Mma5 QS@eqN 'Utility function to read the contents of a file into an array of strings. 0S\HO<~k Function ReadFile(ByVal fileName As String, _
\okvL2:! ByRef lineArray() As String) As Long Z^ .qX\<M /PpZ6ne~[ ReadFile = -1 9Qq%Fw_ Dim oFSO As Object bV:MOj^ Set oFSO = CreateObject("Scripting.FileSystemObject") g(R!M0hdF Erase lineArray [7l5p(= k;<F33v;Mh Dim fid As Long JmuoYl f| If oFSO.fileexists( fileName ) Then <!-#]6 fid = FreeFile() }:\e"Bfv Open fileName For Input As fid uFG ;AY| lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~7H?tp.Dw Close fid PI)uBA; End If C9j5Pd5q1L Set oFSO = Nothing jF{)2|5 Return UBound( lineArray ) zomg$@j ]_hXg*? End Function ,]4.|A_[Rq sh%%U Sub GetFileList( ByVal in_dir As String, _ {sUc2vR ByRef in_flist() As String ) xw3A |Aj?r _:Ov-HIR 'Redimension the file list array ah!fQLMH Erase in_flist `nL^]i uvA 2`%T/ 'Tracks how many files are found *jl_,0g] Dim fCount As Long R/&C}6Gn fCount = 0 :Ek3]`q# ;zo?o t/ 'Recurse directory and search for text files mZ.E;X& ,* Dim f As String nVk]Qe f = Dir$(in_dir & "*.txt") ,]=Qgn While f <> "" TzrU |D? ReDim Preserve in_flist(fCount) X6oY-4O in_flist(fCount) = f *4 Kc "M fCount += 1 !e0/1 j= f = Dir$() ;W!hl<``d* Wend LESF*rh= ReDim Preserve in_flist(fCount-1) tUs{/Je ]K%D$x{+\ End Sub s`,. &
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