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摘要: F,)%?<!I hJ~Uf5Q 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。 uT7B#b7 1gN=-AC 背景: 'K{Z{[s{ 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。 qfRH5)k 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。 t$#jL5 图1. RPC Photonics工程漫射体结构及光束投射形状 HLaRGN3, xCl1g4N !6>~?gNd 步骤 8::$AQL3 dNL(G%Qj+" 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。 en*GM}<V C-6F]2: 图2. RPC Photonics工程漫射体不同类型的散射数据 )6,=f.% 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) zz4N5[" 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 "v({, 例如下所示: ^)*-Bo)I Sample name: EDF-C1-56 7f!YoW;1 Merging data from file EDF-C1-56 0-0.txt TOXfWEU3> Finished merging RPC data for sample EDF-C1-56 y^v6AM FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt !SdSE^lz` 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 6){]1h" a. 创建一个新的散射库 8MzVOF{" b. 散射模型命名 9}F*P669f c. 改变散射模型为“Tabulated BSDF”. [dIXR 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 ) X1-'COQS%& 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。 d,Yw5$i f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, EZ$>.iy{ g. 点击OK (VEpVn3{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 yS(fILV G5aieD.# dS!:JO27 脚本代码: z Q`jP$2 @H7d_S '#Language "WWB-COM" Mh/dpb\Z m\r@@! Option Explicit %'7lbpy,f @l jA Sub Main ~8P!XAU56% UK O[r; 'Cleanup :L RYYw ClearOutputWindow() L`p4->C9A Be=u&T:~ Print "Merging RPC Photonics BSDF Data Files" RcM/!,B SetTextColor(255,0,0) CpeU5 o@ Print "Note: Script should be located in the same folder as the BSDF TXT files." e2t-4}
ww Print "Note: Do not run this script multiple times without deleting the output file between executions." b TM{l.Aq3 SetTextColor(0,0,0) _%!c+f7 u:gN?O/G 'Current directory of this script (should be the same as the text files being merged) #W'HR Dim cDir As String >qjq=Ege cDir = MacroDir$ & "\" ()Y4v
(SDr!!V< 'Array which will be populated with the list of files to be merged KgiJUO`PR Dim fList() As String, curFile As String :'3XAntZA GetFileList( cDir, fList ) ;/fF,L{c +*T7@1 Print "" : $Y9jR Print "Files found for merging:" ")dH,:#S For Each curFile In fList Ax?y Print Chr(9) & curFile m4&h>9. 8 Next MgOR2,cR q[`]D7W
" 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. BJB^m|b) Dim nameArray() As String, sampName As String */|lJm'R nameArray = Split(fList(0)," 0-0.txt") O[s{ Gk'> sampName = nameArray(0) W<$Z=(_v Print "" ;8*`{F[ Print "Sample name: " & Chr(9) & sampName d + / &?3 )-
viGxJ@ 'Open an output file and write the FRED header data L[H5NUG! Dim outFile As String h[1MtmNw outFile = cDir & sampName & "_FRED.txt" ujaGNg?, Open outFile For Output As #1 jR22t`4 Print #1, "type bsdf_data" Q}K#'Og Print #1, "format angles=deg bsdf=value scale=1" 5b/|!{ 8a="/J 'Loop the file list, skip the two header lines and write the remaining data to file T:Hr&ws4 Dim lineArray() As String, curLine As Long ,^;)<[ For Each curFile In fList QP)pgAc Print "Merging data from file " & curFile L
ugn3+ ReadFile( cDir & curFile, lineArray ) ng:9 l3x For curLine = 2 To UBound(lineArray)
L %K\C Print #1, lineArray(curLine) S\5bmvqP" Next 4.h=&jz& Next {u\Mj "
'6;/N 'Close the output file ]2'na?q9 Close #1 J(%0z:exs }L3 oR Print "Finished merging RPC data for sample " & sampName '0uhD.|G Print "FRED formatted data file: " & Chr(9) & outFile +~roU{& o End Sub C] 9p5Hs =%gRW5R% 'Utility function to read the contents of a file into an array of strings. kc @[9eV Function ReadFile(ByVal fileName As String, _ .k9{Yv0 ByRef lineArray() As String) As Long x~{;TZa[I k`9)=&zX+ ReadFile = -1 )0e2ic/ Dim oFSO As Object xD /9F18 Set oFSO = CreateObject("Scripting.FileSystemObject") .tmiQ. Erase lineArray R:AA,^Z 5"]~oPK Dim fid As Long M- 2Tz[ If oFSO.fileexists( fileName ) Then 3
M10fI? fid = FreeFile() ELjK0pE}- Open fileName For Input As fid o|iYd
n\ lineArray = Split(Input(LOF(fid), fid), vbCrLf) lR`'e0Lq Close fid Gqcz<=/ End If W$o27f Set oFSO = Nothing
kWb2F7m Return UBound( lineArray ) >'5_Y]h4m| _#s=h_
FD End Function 9lj!C' q4$+H{xB Sub GetFileList( ByVal in_dir As String, _ Xy5s^82? ByRef in_flist() As String ) y"<))-MH Hiv!BV| 'Redimension the file list array 5,;`$'?a% Erase in_flist /?6|&
6vTo*8D 'Tracks how many files are found C"qU-&*v Dim fCount As Long q$.{j"cZV fCount = 0 Op?OruT[ 5P hX"7 'Recurse directory and search for text files XJ+6FT/qss Dim f As String cx$Gic:4 f = Dir$(in_dir & "*.txt") %F9{EXJy While f <> "" &Q=ZwC7# ReDim Preserve in_flist(fCount) [;oCYb$9 in_flist(fCount) = f W Qzj[ fCount += 1 qxMnp}O f = Dir$() 3q:{1rc Wend Y'3}G<'% ReDim Preserve in_flist(fCount-1) Koln9'tB 0g<K [mPr7 End Sub ExXM:1 e26
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