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摘要: .N>*+U>>P 4s~X 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。 x4PzP
B|V!=r1% 背景: Tt9cX}&& 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。 *iY:R 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。 GqNOWK2O 图1. RPC Photonics工程漫射体结构及光束投射形状 3=o4ncg( /_HTW\7, p;'.7_1 步骤 /P-#y@I #_x5-?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。 ~QlF(@ue r7].48D 图2. RPC Photonics工程漫射体不同类型的散射数据 D"-Wo}"8O' 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) .gGO+8[N* 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 mI{Fs|9h 例如下所示: SOX7 Sample name: EDF-C1-56 [mQ1r*[j Merging data from file EDF-C1-56 0-0.txt $j(d`@.DN~ Finished merging RPC data for sample EDF-C1-56 - f ^!R FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt h_ccE6]t 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 v&(=^A\eN a. 创建一个新的散射库 0>Td4qr+u b. 散射模型命名 I^( pZ9 c. 改变散射模型为“Tabulated BSDF”. 4X*U~} d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) &o7PB`(l e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 CbW[_\ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 1<Mb@t g. 点击OK IY8<^Q'] 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~OsLbz: :*h1ik4t F!g1.49"" 脚本代码: Hc@_@G RM,aG}6M)M '#Language "WWB-COM" ;-JF b$m S[q:b
. Option Explicit aNY-F)XWa /*>}y$ Sub Main Mh2b!B ,u^{zYoW 'Cleanup iZiT/#, H2 ClearOutputWindow() tY]?2u%) n*ShYsc Print "Merging RPC Photonics BSDF Data Files" uF|_6~g SetTextColor(255,0,0) V sxI Print "Note: Script should be located in the same folder as the BSDF TXT files." 5,oLl {S' Print "Note: Do not run this script multiple times without deleting the output file between executions." ~E((n SetTextColor(0,0,0) QW,:'\G mjg@c|rTG 'Current directory of this script (should be the same as the text files being merged) gED|2%BXb Dim cDir As String "_LqIW1 cDir = MacroDir$ & "\" WkE="E} yA"?Hv \o; 'Array which will be populated with the list of files to be merged Z2yO /$< Dim fList() As String, curFile As String 0Fon`3(^\ GetFileList( cDir, fList ) CmbgEGIh[a 4U}J?EB?K Print "" 6,jCO@!
Print "Files found for merging:" %{4U\4d@' For Each curFile In fList ?Y
-;781 Print Chr(9) & curFile 1U.X[}e Next "=
%"@"<) %L]sQq, 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ]NBx5m+y@i Dim nameArray() As String, sampName As String ^7? WR?! nameArray = Split(fList(0)," 0-0.txt") 2[3t7 C sampName = nameArray(0) 'dh{q`#0 Print "" Rvu5#_P Print "Sample name: " & Chr(9) & sampName HyWR&0J ;SjNZi)4d 'Open an output file and write the FRED header data csLbzDg Dim outFile As String UCmy$aW outFile = cDir & sampName & "_FRED.txt" BF2U$-k4 Open outFile For Output As #1 k ZF<~U Print #1, "type bsdf_data" Rh)XYCM Print #1, "format angles=deg bsdf=value scale=1" ^o _J0
]m Yb<:1?76L 'Loop the file list, skip the two header lines and write the remaining data to file h9imS\gfr Dim lineArray() As String, curLine As Long :ChXzZ For Each curFile In fList \W TKw x Print "Merging data from file " & curFile j7Y7&x" ReadFile( cDir & curFile, lineArray ) =oh%-Sh: For curLine = 2 To UBound(lineArray) C{^I}p Print #1, lineArray(curLine) ?)(/SZC0 Next ~' 955fK> Next `5h^!=" fVY I 'Close the output file D6?h
6`J Close #1 @w.DN)GPo 7bO>[RQB Print "Finished merging RPC data for sample " & sampName v@GhwL Print "FRED formatted data file: " & Chr(9) & outFile +:ms`Sr> End Sub ?.F^Oi6
u [sk n9$ 'Utility function to read the contents of a file into an array of strings. Zqe$S
+u Function ReadFile(ByVal fileName As String, _ u&S0 ByRef lineArray() As String) As Long `i(b%$|^&Z vxk0@k_ ReadFile = -1 2bw), W Dim oFSO As Object O%>*=h`P Set oFSO = CreateObject("Scripting.FileSystemObject") @|t]9 Erase lineArray ^swj!da f'5
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Dim fid As Long 1,OkuyXy!> If oFSO.fileexists( fileName ) Then %>9L}OAm fid = FreeFile() :NWIUN Open fileName For Input As fid Wp:vz']V lineArray = Split(Input(LOF(fid), fid), vbCrLf) d`flYNg4 Close fid ;8&/JS N M End If 3 V ^5 4_ Set oFSO = Nothing yl@Nyu Return UBound( lineArray ) MbInXv$q2/ `p* 43nV End Function (2Lmu[ VO {z)_ Sub GetFileList( ByVal in_dir As String, _ ']\SX*z? ByRef in_flist() As String ) L;M@] hG#2}K_ 'Redimension the file list array -?1R l:rM Erase in_flist ST[TKL<] ]v>[r?X#V 'Tracks how many files are found pi#a!Quf\ Dim fCount As Long Z+6WG fCount = 0 d6[' [dG j-**\.4a~ 'Recurse directory and search for text files 7 qn=W Dim f As String z(%tu f = Dir$(in_dir & "*.txt") wY%t# [T3 While f <> "" 2NjgLXP ReDim Preserve in_flist(fCount) z>,tP in_flist(fCount) = f }s'=w]m fCount += 1 C<T6l'S{? f = Dir$() iQ2}*:Jc$ Wend p&<n_b ReDim Preserve in_flist(fCount-1) d(RMD C:^
:^y End Sub V*2*5hx
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