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摘要: /t6X(*xoy Iyd?|f" 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。 LTJc,3\, $7QoMV 8V 背景: Q#(GI2F2# 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。 QZX~T|Ckv 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。 1xU3#b&2tC 图1. RPC Photonics工程漫射体结构及光束投射形状 __[xD\ES `MEYd U1 vA)O{W\o 步骤 P/JK $nb px SX#S6I 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 U$H@ jJ* v+e|o:o# 图2. RPC Photonics工程漫射体不同类型的散射数据 ?0_7?yTR/ 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) oo=#XZkk 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 QRLJ_W^&u 例如下所示: x f4{r+ Sample name: EDF-C1-56 kAM1TWbaVQ Merging data from file EDF-C1-56 0-0.txt YUQtMf9 Finished merging RPC data for sample EDF-C1-56 7O`o ovW$ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt >K# ,cxY 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 htm{!Z]s0 a. 创建一个新的散射库 kkvtB<<Y b. 散射模型命名 ri1C-TJM) c. 改变散射模型为“Tabulated BSDF”. /U6%%%-D` 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 ) o$C|J]% 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。 dr{y0`CCN 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, yAL1O94 g. 点击OK _MWM;f`b 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |wox1Wt|E D;Gq)]O $|KaBx1 脚本代码: Y${l!+q Jti(b*~ '#Language "WWB-COM" 0)Rw|(Fpo] *?yJkJ" Option Explicit .+y>8h3{ i#X!#vyc Sub Main \Hqc9&0 3`HnLD/ 'Cleanup `(0LK%w ClearOutputWindow() kl1Y] ?z} @c'|Iqy` Print "Merging RPC Photonics BSDF Data Files" "Lh SetTextColor(255,0,0) i`)!X:j Print "Note: Script should be located in the same folder as the BSDF TXT files." qQ7w&9r.M Print "Note: Do not run this script multiple times without deleting the output file between executions." z"DkFvA SetTextColor(0,0,0) )a=/8ofe bg?"ILpk 'Current directory of this script (should be the same as the text files being merged) xx*2?i Dim cDir As String BO.dz06(Rw cDir = MacroDir$ & "\" _SZ5P>GIU ]WJfgN4 'Array which will be populated with the list of files to be merged /?"8-0d Dim fList() As String, curFile As String lH|LdlX GetFileList( cDir, fList ) OMihXt[ RV-h IdAU Print "" Fk^3a'/4KJ Print "Files found for merging:" 8_uzpeRhJc For Each curFile In fList 1 7hTr Print Chr(9) & curFile ID1?PM Next WW@"Z}?k 2aw&F Z? 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. dMl+ko Dim nameArray() As String, sampName As String tJ&5tNl nameArray = Split(fList(0)," 0-0.txt") 2
Tvvq(?T sampName = nameArray(0) *! :QdWLq Print "" %-;bu| Print "Sample name: " & Chr(9) & sampName tn/T6C^) >s*Drf X6 'Open an output file and write the FRED header data =OTm2:j#yQ Dim outFile As String }xn_6 outFile = cDir & sampName & "_FRED.txt" y[0`hSQ)~ Open outFile For Output As #1 lm'Zy"~:: Print #1, "type bsdf_data" ED & outFile Ef7:y|? End Sub EU`T6M &m{'nRU}c 'Utility function to read the contents of a file into an array of strings. z
YDK $ Function ReadFile(ByVal fileName As String, _ rjojG59U> ByRef lineArray() As String) As Long V+B71\x< &d$~6'x* ReadFile = -1 "-i#BjZl/ Dim oFSO As Object %l9$a`& Set oFSO = CreateObject("Scripting.FileSystemObject") A[/I#Im7 Erase lineArray A| x:UQlu 18!VO4u\I Dim fid As Long J=WB6zi If oFSO.fileexists( fileName ) Then XQ;I,\m fid = FreeFile() H/cTJ9zz Open fileName For Input As fid z?.(3oLT lineArray = Split(Input(LOF(fid), fid), vbCrLf) k
khE}qSD Close fid ;[5r7
jHU End If -@bp4Z= Set oFSO = Nothing RtF8A5ys Return UBound( lineArray ) z: G}>fk5 H7IW"UkBR End Function o'UHStk `bP?o Sub GetFileList( ByVal in_dir As String, _ C|e+0aW ByRef in_flist() As String ) |XcH]7Ai" SPwPCI1?
'Redimension the file list array 12gw#J/)9h Erase in_flist eK_*q- 8$~3r a 'Tracks how many files are found .H;B=nd* Dim fCount As Long <f%/px%1 fCount = 0 H7e / wJIB$3OT 'Recurse directory and search for text files cC6z,0`3 Dim f As String #EwK"S~ f = Dir$(in_dir & "*.txt") #8?^C]*{0 While f <> "" \graMu}- ReDim Preserve in_flist(fCount) CIQwl 6H9 in_flist(fCount) = f "3y} F fCount += 1 `jW4H$D f = Dir$() 6"%qv`.Fp Wend P4%>k6X ReDim Preserve in_flist(fCount-1) LZV}U* J:};n@< End Sub d.\PS9l
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