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摘要: l26DPtWi p fj%AP: 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。 U#oe8(?# #q{i<E 07 背景: P8DT2|Z6f] 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。 Pb0+z=L 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。 jEQr{X7bEL 图1. RPC Photonics工程漫射体结构及光束投射形状 z/bJDSQ 9/$D&tRN 3L24|-GxH 步骤 (bfHxkR. ],ow@} 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。 ebk{p< lk $S"OH! 图2. RPC Photonics工程漫射体不同类型的散射数据 nQ\ +Za== 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) fMjn8. 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 h.Cr;w,2R 例如下所示: @kR/=EfS Sample name: EDF-C1-56 O=os ,'" Merging data from file EDF-C1-56 0-0.txt 'jp nQcwxx Finished merging RPC data for sample EDF-C1-56 @:$zReS2 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0mB]*<x8 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 27b7~! a. 创建一个新的散射库 !:Lb^C;/ b. 散射模型命名 HR'r~ #j c. 改变散射模型为“Tabulated BSDF”. 8Rq+eOP=S 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 ) (>m3WI$d e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 4;;F(yk8 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, *#j+,q!X g. 点击OK ]JQk,<l5E 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |;q*Zy( EUdu"'=4a /ZAS%_as 脚本代码: l 6wX18~XJ Ba/Z<1) '#Language "WWB-COM" zn5 0dhJ# [Y Option Explicit 5q[0;`J zR)|%[sWwQ Sub Main 9WQC\/w 6,'v
/A- 'Cleanup 8ID
fYJ ClearOutputWindow() \nV|Y=5 Ww*='lz Print "Merging RPC Photonics BSDF Data Files" >V:g'[b SetTextColor(255,0,0) PezUG{q( Print "Note: Script should be located in the same folder as the BSDF TXT files." h'wOslyFa Print "Note: Do not run this script multiple times without deleting the output file between executions." Qg+0(odd SetTextColor(0,0,0) {N+N4* Z(AI]wk3< 'Current directory of this script (should be the same as the text files being merged) ADRjCk}I Dim cDir As String =p>"PqJ/7n cDir = MacroDir$ & "\" }9fH`C/m }fw;{&s{z 'Array which will be populated with the list of files to be merged nf!RB-orF Dim fList() As String, curFile As String <Gzy*1Q& GetFileList( cDir, fList ) qPdNI1 | 0 1[LPN Print "" 'j=7'aX>K Print "Files found for merging:" D/hQ{T For Each curFile In fList E)|_7x<u Print Chr(9) & curFile pYV$sDlD Next JsOPI] yEUF K 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. UM%[UyYQ Dim nameArray() As String, sampName As String Ee>P*7*jB nameArray = Split(fList(0)," 0-0.txt") ~1YL sampName = nameArray(0) <Ft6d Print "" e47JLW&b Print "Sample name: " & Chr(9) & sampName MP, l*wVd Iw~3y{\ 'Open an output file and write the FRED header data l|-1H76 Dim outFile As String k{n*[)m outFile = cDir & sampName & "_FRED.txt" haW8zb0z Open outFile For Output As #1 4R\bU"+jZ_ Print #1, "type bsdf_data" ~T<#HSR` Print #1, "format angles=deg bsdf=value scale=1" S4kGy}{+i W;*rSK|(Sc 'Loop the file list, skip the two header lines and write the remaining data to file M*| y&XBe Dim lineArray() As String, curLine As Long ^a|$z$spf For Each curFile In fList }.|\<8_ Print "Merging data from file " & curFile .EVy?-
ReadFile( cDir & curFile, lineArray ) k%#`{#ni For curLine = 2 To UBound(lineArray) 4 8M)A Print #1, lineArray(curLine) -i|qk`Y Next m`
cw: Next ;nG"y:qq Ojp)OeF\ 'Close the output file rKq/=Avv Close #1 %*P59% !c:Q+:,H Print "Finished merging RPC data for sample " & sampName Rk^Fasg" Print "FRED formatted data file: " & Chr(9) & outFile 8^=g$;g End Sub ,.tT9?
m H V<|eL # 'Utility function to read the contents of a file into an array of strings. wo7.y["$ Function ReadFile(ByVal fileName As String, _ AY:3o3M ByRef lineArray() As String) As Long Mw7!w-1+ PaV [{CD ReadFile = -1 gs 8w/ Dim oFSO As Object ]CH@T9d5V Set oFSO = CreateObject("Scripting.FileSystemObject") {rGq|Bj Erase lineArray >ZkcL7t9 XETY)<g Dim fid As Long H~1la V If oFSO.fileexists( fileName ) Then N+l~r]: & fid = FreeFile() k(o[T),_%0 Open fileName For Input As fid @/yRE^c lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jl&bWp^3 Close fid G;V@oT End If @B
~![l Set oFSO = Nothing _~_04p Return UBound( lineArray ) ;_K+b, ? AP2Opsl End Function b$[_(QUw I*@\pc} Sub GetFileList( ByVal in_dir As String, _ Y\BB;"x1 ByRef in_flist() As String ) VgZ<T,SuW >5wA B 'Redimension the file list array rB?u.jn0T Erase in_flist F
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>joGGT 'Tracks how many files are found j2lo~J) Dim fCount As Long -'JTVfm. fCount = 0 %cO;{og M # j*$ `W; 'Recurse directory and search for text files mc|T}B Dim f As String vX)6N#D! f = Dir$(in_dir & "*.txt") yk#yrxM While f <> "" +@]1!|@( ReDim Preserve in_flist(fCount) l7aGo1TcIh in_flist(fCount) = f mW1Sd#0 fCount += 1 M
^ZoBsZ f = Dir$() [ar:zlV8 Wend *)ed( +b ReDim Preserve in_flist(fCount-1) K%qunjv riZFcVsB End Sub @iUzRsl
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