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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。 ?0*[
L ~:f..|JM 背景: G&1bhi52 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。 +> !nqp 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。 c$&({Z{1 图1. RPC Photonics工程漫射体结构及光束投射形状
~KkC089D (Y7zaAG] <y^_&9 步骤 P3|s}&
-6NoEmb)\' 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。 ! {G0' Rb:<?&7ZzN 图2. RPC Photonics工程漫射体不同类型的散射数据
m<>BxX 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) =|IlORf< 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 KHHYk>FR 例如下所示: !\BZ_guz Sample name: EDF-C1-56 j"h/v7~ Merging data from file EDF-C1-56 0-0.txt $>O~7Nfst7 Finished merging RPC data for sample EDF-C1-56 g:JSy FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt [NO4Wzc 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 .|R4E a. 创建一个新的散射库 ws!~MSIy b. 散射模型命名 hPBBXj/= c. 改变散射模型为“Tabulated BSDF”. &U|c=$!\ 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 ) p5or"tK 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。 EXVZ?NG 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, h L [ eA g. 点击OK b=:u d[h 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 OmBz'sp: ^-k"gLg R`a~8QVh&5 脚本代码: I]e+5 E0 |> ]@w\] '#Language "WWB-COM" jUA~}DVD d:K\W[$Bz Option Explicit w($a'&d`0 [I4MK%YQ Sub Main Yr-SlO> a!: N
C 'Cleanup /^nIOAeE ClearOutputWindow() A2M(
ad .4WJk>g Print "Merging RPC Photonics BSDF Data Files" lRg?||1ik SetTextColor(255,0,0) jj]\]6@+P Print "Note: Script should be located in the same folder as the BSDF TXT files." "*t6KXVaM Print "Note: Do not run this script multiple times without deleting the output file between executions." >iOf3I-ATt SetTextColor(0,0,0) rn*'[i? pz['o 'Current directory of this script (should be the same as the text files being merged) 2Wluc37 Dim cDir As String ;i6~iLY cDir = MacroDir$ & "\" bGeIb-|( ")uKDq 'Array which will be populated with the list of files to be merged C&w0HoF Dim fList() As String, curFile As String L@(. i GetFileList( cDir, fList ) ~KS@Ulrox z&d.YO_W Print "" }BlyEcw'aN Print "Files found for merging:" .@OQ$D < For Each curFile In fList 23^>#b7st Print Chr(9) & curFile a#r{FoU{M8 Next +8//mrL_/ u)r/#fUZ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement.
FJ~d&L\l Dim nameArray() As String, sampName As String )x/#sW%) nameArray = Split(fList(0)," 0-0.txt") R~oJ-}iYX sampName = nameArray(0) cHF W"g78 Print "" d0I s|Gs Print "Sample name: " & Chr(9) & sampName tf6m. hp'oiR;~w 'Open an output file and write the FRED header data '1b 1N5~ Dim outFile As String xc}[q`vK outFile = cDir & sampName & "_FRED.txt" 'D5J5+.z Open outFile For Output As #1 $"/l*H\h Print #1, "type bsdf_data" =figat Print #1, "format angles=deg bsdf=value scale=1" oa"Bpi9i I8J>>H'#A 'Loop the file list, skip the two header lines and write the remaining data to file 3/n?g7B Dim lineArray() As String, curLine As Long cl^UFlf[ For Each curFile In fList 9t\14tVwx Print "Merging data from file " & curFile /C!~v!;e ReadFile( cDir & curFile, lineArray ) w ea For curLine = 2 To UBound(lineArray) -6- sI Print #1, lineArray(curLine) 8+oc4~!A@n Next [l5jPL}6 Next ESV./~K G^)]FwTs 'Close the output file /r~2KZE Close #1 #0<pRDXj a[~[lk=7 Print "Finished merging RPC data for sample " & sampName Sr6'$8#>Y Print "FRED formatted data file: " & Chr(9) & outFile ct-Bq End Sub <h/q^| tZ{ *g+ZXB 'Utility function to read the contents of a file into an array of strings. > "F-1{ Function ReadFile(ByVal fileName As String, _ j.Uy>ol ByRef lineArray() As String) As Long HU?1>}4L lot`6] ReadFile = -1 j_90iP^5: Dim oFSO As Object h7E?7nR Set oFSO = CreateObject("Scripting.FileSystemObject") }kmAUaa,Z Erase lineArray [IOI&`?D o4FHR+u<M Dim fid As Long p+=zl`\=| If oFSO.fileexists( fileName ) Then =H;n$ -P fid = FreeFile() wGLMLbj5 Open fileName For Input As fid i_*yS+Z; lineArray = Split(Input(LOF(fid), fid), vbCrLf) E6~VHQa2? Close fid s 7 nl End If jnp~ACN, Set oFSO = Nothing a%`Yz"<lQ Return UBound( lineArray ) Ql5bjlQdO A` _dj}UF End Function yy{YduI q#AEu
xI1 Sub GetFileList( ByVal in_dir As String, _ j%'2^C8 ByRef in_flist() As String ) QY)p![6Fj =a,qRO 'Redimension the file list array MS""-zn< Erase in_flist Cty{ H1U$ApD 'Tracks how many files are found F*U(Wl= Dim fCount As Long kfas4mkc fCount = 0
s*gqKQ; ir.RO7f 'Recurse directory and search for text files ,4"N7_!7 Dim f As String 2EM6k|l5 f = Dir$(in_dir & "*.txt") }'wZ)N@ While f <> "" I=&i &6v8G ReDim Preserve in_flist(fCount) IWv5UmjN in_flist(fCount) = f ^)]U5+g? fCount += 1 [(*Eg!?W= f = Dir$() 7#j.yf4 Wend QD%xmP ReDim Preserve in_flist(fCount-1) ~vDa2D<9% X9?)P5h= End Sub k vZ w4Pk P.Bwfa
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