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摘要: ->IZZ5G< O.y ?q 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。 lqrI*@>Tz BaP'y8dVN 背景: S^D@8<6GJ 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。 1Lje.%(E. 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。 v/~&n 图1. RPC Photonics工程漫射体结构及光束投射形状 qG~6YCqii s%vy^x29 jd5kkX8= 步骤 Q qj9o2 x7gd6"10^ 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。 E^{!B]/oP ZO<\rX ( 图2. RPC Photonics工程漫射体不同类型的散射数据 :YkAp9civ 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) pih 0ME}z 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 eYkg4 O' 例如下所示: tZg)VJQys Sample name: EDF-C1-56 RZnmia Merging data from file EDF-C1-56 0-0.txt x2HISxg Finished merging RPC data for sample EDF-C1-56 }{,Wha5\n FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt !RwhVaSh 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 xf7YIhL^* a. 创建一个新的散射库 e_!Z-#\J% b. 散射模型命名 {LA?v& b' c. 改变散射模型为“Tabulated BSDF”. Y+g(aak+. 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 ) W)o*$cu e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 qZV|}M>P) f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, rhaq!s38: g. 点击OK a[rb-Z 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (IjM 5{DwD{Q jyyig% 脚本代码: ^PJN$BJx d9jD?HgM( '#Language "WWB-COM" 5efN5Kt `@,Vbn^_ Option Explicit Vom,^`} #<
:`:@2 Sub Main LLzxCMc9* 3'A0{(b 'Cleanup H{9P=l ClearOutputWindow() ]8$H 'u(C {0/2Hw n Print "Merging RPC Photonics BSDF Data Files" ;0?OBUDO SetTextColor(255,0,0) Ml?KnSb Print "Note: Script should be located in the same folder as the BSDF TXT files." 'YbE%i} Print "Note: Do not run this script multiple times without deleting the output file between executions." # SJJ@SM SetTextColor(0,0,0) ^liW*F"UY "8U=0 a 'Current directory of this script (should be the same as the text files being merged) A yn$, Dim cDir As String ]WcN6|b+ cDir = MacroDir$ & "\" fF#Fc&B 5X5UUdTM 'Array which will be populated with the list of files to be merged Kf$(7FT'` Dim fList() As String, curFile As String (LXYx< GetFileList( cDir, fList ) !SnLvW89Z `pDTjJ Print "" ln,9v Print "Files found for merging:" {5%d#|? For Each curFile In fList jpW_q+^? Print Chr(9) & curFile o#z$LT1dY Next >YF=6zq.` E&@#*~ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. }ksp(.}G Dim nameArray() As String, sampName As String q j9q nameArray = Split(fList(0)," 0-0.txt") WMWMb3 sampName = nameArray(0) &U}8@; Print "" *O[/-
p&7 Print "Sample name: " & Chr(9) & sampName ;<b7kepR II~91IEk 'Open an output file and write the FRED header data <1*\ ~CX Dim outFile As String Q^05n$ tI outFile = cDir & sampName & "_FRED.txt" 1_c%p#?K Open outFile For Output As #1 KPjAk Print #1, "type bsdf_data" w2('75$J Print #1, "format angles=deg bsdf=value scale=1" XsFzSm O1DUBRli!q 'Loop the file list, skip the two header lines and write the remaining data to file 7#9%,6Yi Dim lineArray() As String, curLine As Long anfnqa8 For Each curFile In fList E:A!tu$B Print "Merging data from file " & curFile vW? /: ReadFile( cDir & curFile, lineArray ) R1%J6wZq For curLine = 2 To UBound(lineArray) \"Z\Af< Print #1, lineArray(curLine) 9v3n4=gc Next cc}#-HKR[ Next -F3~X R `f~$h?}3-@ 'Close the output file D~M R)z_p~ Close #1 ]Ge>S?u dIhfp7| Print "Finished merging RPC data for sample " & sampName g:G5'pZf Print "FRED formatted data file: " & Chr(9) & outFile g4 +Hq * End Sub
+`ov1h Bm%|WQK 'Utility function to read the contents of a file into an array of strings. co^h2b Function ReadFile(ByVal fileName As String, _ 8?: 2< ByRef lineArray() As String) As Long 87!m l Z ZCm438 ReadFile = -1 V*Xr}FE Dim oFSO As Object $}z/BV1I Set oFSO = CreateObject("Scripting.FileSystemObject") h5-yhG Erase lineArray h9iQn<lp4. F8Mf,jnPs Dim fid As Long m!P<#
|V If oFSO.fileexists( fileName ) Then U^U
hZ! fid = FreeFile() 8.I3%u Open fileName For Input As fid u$(ei2f lineArray = Split(Input(LOF(fid), fid), vbCrLf) UTN[!0[
Close fid g)|vS>^~ End If y*US^HJOZ Set oFSO = Nothing Ip)u6We>I Return UBound( lineArray ) A^LS^!Jz wrX n|aV End Function PCV#O63[ *W>, 98 Sub GetFileList( ByVal in_dir As String, _ ;vX1U8 ByRef in_flist() As String ) gjX1 z{{~L T.-tV[2 'Redimension the file list array unbIfl= Erase in_flist Y"yrc0'&T Ck"db30. 'Tracks how many files are found C+5X8 Dim fCount As Long WXDo`_{R fCount = 0 ;fN^MW@&[ {d0-. 'Recurse directory and search for text files d~h;|Bl[ Dim f As String iDhC_F| f = Dir$(in_dir & "*.txt") n4}e!
While f <> "" ZU+_nWnl ReDim Preserve in_flist(fCount) g#7Q-n3^ in_flist(fCount) = f aIrM-c8.O fCount += 1 FH$q,BI!R f = Dir$() uwZ,l-6T Wend I;eoy, ReDim Preserve in_flist(fCount-1) uGqeT#dP !"Q%I#8uh End Sub )& Oxp&x
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