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摘要: Q4Nut nA(5p?D+YB 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。 HZ2f|Y|T "Lyb4# M 背景: v.ow`MO=; 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。 t3 3\f<e 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。 Zt&
7p 图1. RPC Photonics工程漫射体结构及光束投射形状 f%3MDI iGSF5S E9b>wP 步骤 L=<$^ m 3&I3ViAH 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 .}GOHW)} ?\I@w4 图2. RPC Photonics工程漫射体不同类型的散射数据 0dIGX |e 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) p1[|5r5Day 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 HWIn.ij 例如下所示: 1,:QrhC Sample name: EDF-C1-56 '[HBKn$` Merging data from file EDF-C1-56 0-0.txt n2dOCntN> Finished merging RPC data for sample EDF-C1-56 <00nu'Ex1v FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt g:.LCF 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 62kA(F0e, a. 创建一个新的散射库 ~]24">VZf b. 散射模型命名 f*:N*cC c. 改变散射模型为“Tabulated BSDF”. L{GlDoFk 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 ) !u:Fn)j 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。 OLWn0 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, P'[ISGt g. 点击OK ^hsr/| 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U# IPYyV AHMvh 7O? n^rbc;} 脚本代码: ~c55LlO> #S]O|$&* '#Language "WWB-COM" nVr V6w 0$NzRPbH Option Explicit Y
O|hwhe_ ,gW$m~\ Sub Main me F. -tx%#(?wH 'Cleanup
'SXLnoeTa ClearOutputWindow() ^$mCF%e8H q,_EHPc Print "Merging RPC Photonics BSDF Data Files" 6kMEm)YjT SetTextColor(255,0,0) ?9 W2ax-4 Print "Note: Script should be located in the same folder as the BSDF TXT files." EiP N44( Print "Note: Do not run this script multiple times without deleting the output file between executions." C^LxJG{L5 SetTextColor(0,0,0) 4jlwu0L+ V)4?y9xZv 'Current directory of this script (should be the same as the text files being merged) Bio QV47B Dim cDir As String ~}/_QlX` K cDir = MacroDir$ & "\" Hq~SRc~ N"0>)tG 'Array which will be populated with the list of files to be merged I *f@M} Dim fList() As String, curFile As String 1H\5E~X GetFileList( cDir, fList ) <;@E
.I\N cp"{W-Q{$ Print "" :^qUr`) Print "Files found for merging:" m&#D ~ For Each curFile In fList kyZZ0 Print Chr(9) & curFile oLtzPC Next 1vAJ(O{- 9.,IqnP 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. bdvpH DA Dim nameArray() As String, sampName As String ,&s"f4Mft nameArray = Split(fList(0)," 0-0.txt") 6ZwQ/~7H sampName = nameArray(0) t8; nP[` Print "" 82V;J 8T? Print "Sample name: " & Chr(9) & sampName ILiOEwHS7F -<AGCiLz 'Open an output file and write the FRED header data .
Y$xNLoP[ Dim outFile As String {d0
rUHP outFile = cDir & sampName & "_FRED.txt" i5_l//] Open outFile For Output As #1 n<@C'\j@ Print #1, "type bsdf_data" 6OJhF7\0& Print #1, "format angles=deg bsdf=value scale=1" c/=\YeR sk_xQo#Y
3 'Loop the file list, skip the two header lines and write the remaining data to file ,1.Td=lY$ Dim lineArray() As String, curLine As Long IFZw54 For Each curFile In fList ~ 588md : Print "Merging data from file " & curFile mVN\ ReadFile( cDir & curFile, lineArray ) (]VY==t~ For curLine = 2 To UBound(lineArray) ay`R jT Print #1, lineArray(curLine) ^rO!- Next uJ fXe Next \IEuu^ C[l5[DpH 'Close the output file pB]*cd B? Close #1 l>hvWK[ ?I U-$nwji Print "Finished merging RPC data for sample " & sampName :22wq{ Print "FRED formatted data file: " & Chr(9) & outFile TTWiwPo59 End Sub ,|;\)tT d+5v[x~' 'Utility function to read the contents of a file into an array of strings. 'geN
dx Function ReadFile(ByVal fileName As String, _ _EP~PW#J ByRef lineArray() As String) As Long E8t{[N6d 5^CWF| ReadFile = -1 fQ-IM/z Dim oFSO As Object bb+iUV|Do Set oFSO = CreateObject("Scripting.FileSystemObject") g706*o)h Erase lineArray glkH??S !/!Fc'A Dim fid As Long x^cJ~e2 If oFSO.fileexists( fileName ) Then bweAmSs fid = FreeFile() e?
|4O<@ Open fileName For Input As fid Z^%HDB9^ lineArray = Split(Input(LOF(fid), fid), vbCrLf) TN08,:k Close fid "5Z5x%3I End If QF22_D<.}J Set oFSO = Nothing H;DjM;be Return UBound( lineArray ) `=Bv+ v-"nyy-&Z End Function r
Cz,XYV 5yj6MaqJ Sub GetFileList( ByVal in_dir As String, _ 92N `Q} ByRef in_flist() As String ) hvA|d=R( _?K,Jc8j. 'Redimension the file list array rZ.z!10 Erase in_flist sheCwhV dl`{:ZR S 'Tracks how many files are found N-Bw&hEZ Dim fCount As Long ^ ]+vtk fCount = 0 :2XX~| !\OX}kHX5 'Recurse directory and search for text files }}"|(2I Dim f As String i'1MZ%. f = Dir$(in_dir & "*.txt") -3m!970 While f <> "" vTWm_ed+^ ReDim Preserve in_flist(fCount) =8"xQ>D62 in_flist(fCount) = f '!`]Zc fCount += 1 6['o^>\}f f = Dir$() d7 :=axo, Wend Pmd5P:n*, ReDim Preserve in_flist(fCount-1) >McEuoZx9 ;hEeFJ=/G End Sub zH#urF6<
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