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摘要: 0LVE@qEL x/TGp?\g 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。 CDg AGy zok D:c 背景: y).P=z 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。 LVtu*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。 _g|acBF 图1. RPC Photonics工程漫射体结构及光束投射形状 WO</Q6+ 3P=w =~e ?T*";_o,B 步骤 >Wi s.e%b -f>'RI95> 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。 e1 a*'T$z +cg
{[f,J; 图2. RPC Photonics工程漫射体不同类型的散射数据 R9dP ,<2 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) [B/0-(? 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 -WR}m6yMr 例如下所示: mBl7{w;Iv Sample name: EDF-C1-56 o" _=K%9 Merging data from file EDF-C1-56 0-0.txt hw,^G5m Finished merging RPC data for sample EDF-C1-56 n.$(}A FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (O5)wej 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2_pz3<,\ a. 创建一个新的散射库 `F1dyf!p< b. 散射模型命名 1kFjas`g c. 改变散射模型为“Tabulated BSDF”. ,seFkG@1 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 ) jMU9{Si 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。 it}-^3AM 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, 9N
Le&o g. 点击OK F$Pp]"82'm 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 b7$}JCn
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脚本代码: pMN<p[MB `SOhG?Zo '#Language "WWB-COM" ^
}#f() hx!`F Option Explicit 2V$9ei6 _i@x@:_l Sub Main `Cj,HI_/* N(R,8GF5G 'Cleanup i QqbzOY ClearOutputWindow() $FCw$ +w !#.vyBK# Print "Merging RPC Photonics BSDF Data Files" %FS;>;i? SetTextColor(255,0,0) 4(m3c<'P Print "Note: Script should be located in the same folder as the BSDF TXT files." Y'_ D<Mp Print "Note: Do not run this script multiple times without deleting the output file between executions." 2u&c
&G SetTextColor(0,0,0) OK\]*r |Ow$n 'Current directory of this script (should be the same as the text files being merged) lIl9ypikg Dim cDir As String Q-Y@)Mf~?0 cDir = MacroDir$ & "\" ~7BX@? ayH>XwY6 'Array which will be populated with the list of files to be merged 4~WlP,,M Dim fList() As String, curFile As String M9g1d7% GetFileList( cDir, fList ) IMR$x(g=
F '%O\E{h Print "" X,53c$ Print "Files found for merging:" bV7QVu8 For Each curFile In fList ^K>pT}u Print Chr(9) & curFile \[E-: Next o}R|tOe Kz^ hQd 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ^z?=?%{ Dim nameArray() As String, sampName As String =0Y'f](2eW nameArray = Split(fList(0)," 0-0.txt") %#Q
#N,fw sampName = nameArray(0) .Bijc G Print "" 1
'%-y Print "Sample name: " & Chr(9) & sampName A'v[SUW'm 5oa]dco 'Open an output file and write the FRED header data Z{16S=0 Dim outFile As String %>]#vQ| outFile = cDir & sampName & "_FRED.txt" % NwoU%q Open outFile For Output As #1 sp,(&Y]US Print #1, "type bsdf_data" %w%zv2d Print #1, "format angles=deg bsdf=value scale=1" Es,0'\m& w`38DF@K 'Loop the file list, skip the two header lines and write the remaining data to file N>T=L0` Dim lineArray() As String, curLine As Long /^WE@r[: For Each curFile In fList .Px,=56$X Print "Merging data from file " & curFile Z~B+*HF ReadFile( cDir & curFile, lineArray ) ^:$j:w?j For curLine = 2 To UBound(lineArray) *xho Print #1, lineArray(curLine) M{y|7e%K Next "URVX1#(r Next -hm9sNox [/n'@cjNZ 'Close the output file ]n/jJ_[ Close #1 &<OMGGQ[h PK9Qm'W b Print "Finished merging RPC data for sample " & sampName 4v i B=> Print "FRED formatted data file: " & Chr(9) & outFile p@`4 Qz End Sub [kQ"6wh8 y& Gw.N}<r 'Utility function to read the contents of a file into an array of strings. Zj5NWzj
X Function ReadFile(ByVal fileName As String, _ $Jt8d|UP ByRef lineArray() As String) As Long ]lC4+{V J\9jsx!WQ ReadFile = -1 F\l!A'Q+t Dim oFSO As Object 1gO//fdI Set oFSO = CreateObject("Scripting.FileSystemObject") 8~rT Erase lineArray ;%lJD"yF FxMMxY,*% Dim fid As Long SlM>";C\ If oFSO.fileexists( fileName ) Then zbdOCfA; fid = FreeFile() 7Co3P@@ Open fileName For Input As fid c lq
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lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1j8 /4: Close fid ">rsA&hN- End If :Fq2x_IUE Set oFSO = Nothing
}qTv&Z3$ Return UBound( lineArray ) 6i55J a qsQ]M^@> End Function (gv=P>: 7UY('Q[ Sub GetFileList( ByVal in_dir As String, _ kvY}
yw7 ByRef in_flist() As String ) QLxXp Ul7,k\q@ 'Redimension the file list array B>c[Zg1 Erase in_flist V/+H_=| t>fA!K%{ 'Tracks how many files are found })Ix.!p Dim fCount As Long xUV_2n+ fCount = 0 &C!g(fS KI^ q 5D ? 'Recurse directory and search for text files ZC>`ca Dim f As String .oW~:mY f = Dir$(in_dir & "*.txt") ~M|NzK_9 While f <> "" `XFX`1 ReDim Preserve in_flist(fCount) iGpK\oH in_flist(fCount) = f j58Dki->. fCount += 1 ~QQEHx\4zZ f = Dir$() `"-`D!U?$ Wend j@!BOL~? ReDim Preserve in_flist(fCount-1) #w[q.+A d7n4zx1Hh End Sub T=iZ9w
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