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摘要: J 5h+s-' 3nY1[, 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。 <foCb%$(? qQ!1t>j+H 背景: ;q0uE:^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。 jCTAKaq 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。 /7!""{1\\ 图1. RPC Photonics工程漫射体结构及光束投射形状 $3Z-)m @!&}}"< q1E:l!2al 步骤 H
_Va"yTO6 o]IjK 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 v/ *Y#(X
E7Cy(LO 图2. RPC Photonics工程漫射体不同类型的散射数据 9WJz~SP+vR 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) @aQ1khEd 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 47r_y\U h 例如下所示: uxg9yp@| Sample name: EDF-C1-56 M MzGd:0b Merging data from file EDF-C1-56 0-0.txt 8q`$y$06Dk Finished merging RPC data for sample EDF-C1-56 Mg#j3W}] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt yqSs,vz 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 GE|+fYVM-$ a. 创建一个新的散射库 qS&%! b. 散射模型命名 B3Jgd,[ c. 改变散射模型为“Tabulated BSDF”. PA6=wfc 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 ) _LwOOZj 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。 Q-#$Aa 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, A]L%dFK g. 点击OK iCP/P% 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =h(W4scgqX 4@.|_zY ^\B:R, 脚本代码: iqnJ~g %AOIKK5 '#Language "WWB-COM" ]nhr+;of/- kj+#TnF- Option Explicit (;. AS KRJLxNr Sub Main 8@NH%zWBp $./bjV% 'Cleanup iut`7 ClearOutputWindow() pj?XLiM54% 4'KOpl
K Print "Merging RPC Photonics BSDF Data Files" o;b0m;~ SetTextColor(255,0,0) )Qm[[p nj Print "Note: Script should be located in the same folder as the BSDF TXT files." rQTr8DYH Print "Note: Do not run this script multiple times without deleting the output file between executions." }FF W|f SetTextColor(0,0,0) J/7R\;q`~o
"o& E2# 'Current directory of this script (should be the same as the text files being merged) ,:+dg(\r Dim cDir As String E&yD8=vw cDir = MacroDir$ & "\" >pkT1Z&' 74<!&t 'Array which will be populated with the list of files to be merged Khh0*S8.K Dim fList() As String, curFile As String |%~+2m GetFileList( cDir, fList ) EL3|u64GO B7\k< Nit0 Print "" 6)pH|d.FR Print "Files found for merging:" LtT\z<bAI For Each curFile In fList bYe;b><G Print Chr(9) & curFile BF{w)=@/' Next = sAn,ri D .vw8H3 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [nxE)D Dim nameArray() As String, sampName As String @eqeN9e nameArray = Split(fList(0)," 0-0.txt") {f9{8-W<u sampName = nameArray(0) .s/fhk, Print "" wPbkUVO Print "Sample name: " & Chr(9) & sampName [6jbgW~E =O|c-k,f@ 'Open an output file and write the FRED header data wV?,Z!\Z Dim outFile As String cYNJhGY outFile = cDir & sampName & "_FRED.txt" wix5B@ Open outFile For Output As #1 i`
A Print #1, "type bsdf_data" # N~,F@t Print #1, "format angles=deg bsdf=value scale=1" eMK+X \ :5GZ \Z8F 'Loop the file list, skip the two header lines and write the remaining data to file l0*Gb Dim lineArray() As String, curLine As Long N__H*yP For Each curFile In fList NGYyn`Lx Print "Merging data from file " & curFile 7dihVvL
$ ReadFile( cDir & curFile, lineArray ) \EbbkN:D For curLine = 2 To UBound(lineArray) S\y%4}j Print #1, lineArray(curLine) ]IJRnVp% Next x0a.!
Next r%Rs0)$yj {|9}+
@5Q1 'Close the output file }~Q"s2 Close #1 9ykM3 9^P2I)aD Print "Finished merging RPC data for sample " & sampName +.[\g|G Print "FRED formatted data file: " & Chr(9) & outFile a:SQ16_? End Sub l2b{u
GE PXP`ZLF 'Utility function to read the contents of a file into an array of strings. x4Rk<Th"o Function ReadFile(ByVal fileName As String, _ gG54: ByRef lineArray() As String) As Long 7#;vG>] ~;-9X| ReadFile = -1 fbZibcQ%k Dim oFSO As Object QzGV.Mt2 Set oFSO = CreateObject("Scripting.FileSystemObject") tXF]t
Erase lineArray E_$z`or 4{9d#[KW Dim fid As Long l#3($QV, If oFSO.fileexists( fileName ) Then [n,?WwC fid = FreeFile() NTs;FX~g[ Open fileName For Input As fid ~7q uTp) lineArray = Split(Input(LOF(fid), fid), vbCrLf) E]^5I3=O Close fid ]kktoP|D End If x:K?\< Set oFSO = Nothing Z+s%;f; Return UBound( lineArray ) HN5W@5m:
. j'Y/ H5 End Function )"@t6. "u}9@}* Sub GetFileList( ByVal in_dir As String, _ }{7e7tW6 ByRef in_flist() As String ) WoL9V"] Y{Ap80'\6 'Redimension the file list array |oKu=/[K Erase in_flist "i'bTVs }4jC_ZAupt 'Tracks how many files are found Uv?'m&_ Dim fCount As Long ?`sy%G fCount = 0 lHBI SVP:D3) 'Recurse directory and search for text files [_DPxM=V Dim f As String s(@h 2:j f = Dir$(in_dir & "*.txt") v<rF'D2 While f <> "" +KK$0pL ReDim Preserve in_flist(fCount) _ P ,@ in_flist(fCount) = f jThbeY[ fCount += 1 _&{%Wc5W~F f = Dir$() o sdOw8 Wend $7gB_o$zz ReDim Preserve in_flist(fCount-1) Unl?fXI "|LQK0q3 End Sub <Q`&o@I Rmh*TQu a4GWuozl QQ:2987619807 #0y<a:}R
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