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摘要: Cye$H9 2 <W]g2>9o9 RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 OCy0#aPRS XhsTT2B 背景: n4lutnF Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 +y 87~]] FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 !`bio cA 图1. RPC Photonics工程漫射体结构及光束投射形状 jp' K%P >M Jg , >%E([:$A 步骤 mZIoaF>t "n:{!1VGw 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。 ( )sTb>L ET];%~ ^ 图2. RPC Photonics工程漫射体不同类型的散射数据 OGiV{9U 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) +\Q?w?DE| 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 G|8%qd 例如下所示: )bx_;9Y{ Sample name: EDF-C1-56 1c+]gIe Merging data from file EDF-C1-56 0-0.txt [7m1Q< Finished merging RPC data for sample EDF-C1-56 6n1rL FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (6v(9p 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 E2L(wt}^ a. 创建一个新的散射库 PCn Q_A-Q b. 散射模型命名 aCV4AyG c. 改变散射模型为“Tabulated BSDF”. 9z?oB&5 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 ) lt$zA%`odc 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。 ~el3I=KC} 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, #}^-C&~ g. 点击OK qNyzU@ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 T!W~n
ZC ^w~23g. vILy>QS) 脚本代码: ,7,g%?_P %7`f{|. '#Language "WWB-COM" 9x+<Ik ZDL']*)' Option Explicit p
(FlR?= S 9dh>l!2 Sub Main Y,8KPg@W ,%bhyww< 'Cleanup [~D|peM3 ClearOutputWindow() clI*7j.4E# 7t9c7HLuj/ Print "Merging RPC Photonics BSDF Data Files" z=&z_}M8 SetTextColor(255,0,0) #<( = }? Print "Note: Script should be located in the same folder as the BSDF TXT files." =OJ;0 /$6 Print "Note: Do not run this script multiple times without deleting the output file between executions." )x#5Il
H SetTextColor(0,0,0) HmK*b Z S'~o,`xy 'Current directory of this script (should be the same as the text files being merged) !2:3MbtR Dim cDir As String \bCX=E- cDir = MacroDir$ & "\" z<gu00U7 ~{>?*Gd&T 'Array which will be populated with the list of files to be merged 9@$,oM= Dim fList() As String, curFile As String +&KQ28r GetFileList( cDir, fList ) Q-rL$%~=' BcA31% Print "" /W#O + Print "Files found for merging:" [=*E+Oc For Each curFile In fList q^rl) Print Chr(9) & curFile mxwdugr` Next *p ? e.%nd !\[+99F# 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. I>h<b_y Dim nameArray() As String, sampName As String f]~c)P
Cs nameArray = Split(fList(0)," 0-0.txt") Hg}I]!B sampName = nameArray(0) %,b X/! Print "" c(-Mc6 Print "Sample name: " & Chr(9) & sampName dTEJ=d40 B'>*[!A 'Open an output file and write the FRED header data Oi:JiD= Dim outFile As String e{G_GycH outFile = cDir & sampName & "_FRED.txt" KiLvI,9y Open outFile For Output As #1 4lc)& Print #1, "type bsdf_data" gvli %9n Print #1, "format angles=deg bsdf=value scale=1" ;kaHN;4? 4YbC(f 'Loop the file list, skip the two header lines and write the remaining data to file dGH_ z8 Dim lineArray() As String, curLine As Long t\j!K2 For Each curFile In fList a
ib}`l Print "Merging data from file " & curFile &J"YsY ReadFile( cDir & curFile, lineArray ) =.m6FRsU For curLine = 2 To UBound(lineArray) nR5bs;gk" Print #1, lineArray(curLine) >L2*CV3p Next zCXqBuvu1 Next CKARg8o SqB/4P 'Close the output file s*,cF6 Close #1 >?XbU} RJJ1 Print "Finished merging RPC data for sample " & sampName _^uc 0= Print "FRED formatted data file: " & Chr(9) & outFile 9n}A ^ End Sub ;:#U6?=t hd^x}iK" 'Utility function to read the contents of a file into an array of strings. y{rn-?`{ Function ReadFile(ByVal fileName As String, _ #-x@"+z ByRef lineArray() As String) As Long `ypL]$cW qR,.W/eS8 ReadFile = -1 5 Rz/Ri\c= Dim oFSO As Object $>vy(Y Set oFSO = CreateObject("Scripting.FileSystemObject") iV)ac\ Erase lineArray HY;oy( oW'POAr Dim fid As Long D?u` If oFSO.fileexists( fileName ) Then ]UUI~sFE fid = FreeFile() [%.18FWI Open fileName For Input As fid *m_93J lineArray = Split(Input(LOF(fid), fid), vbCrLf) t!l%/$- Close fid S!j^|! End If Fe="EDh Set oFSO = Nothing G:+16XCra Return UBound( lineArray ) me. /o(!? 1k>naf~O End Function g37q/nEv ce5nG0@# Sub GetFileList( ByVal in_dir As String, _ 1)U}i ^ ByRef in_flist() As String ) ?iln<%G ZO7bSxAN- 'Redimension the file list array R#0{Wg0O) Erase in_flist )Xno|$b5Eo ##~!M(c 'Tracks how many files are found a>b8-j=J Dim fCount As Long N$'>XtO fCount = 0 %8Yyj{^!( P0#`anUr1 'Recurse directory and search for text files vvh.@f Dim f As String ^gm>!-Gx f = Dir$(in_dir & "*.txt") xKW"X
While f <> "" }J;~P
9Y ReDim Preserve in_flist(fCount) i`~~+6`J in_flist(fCount) = f .}p|`3$P fCount += 1 ;f(n.i f = Dir$() {bTeAfbf] Wend ,I39&;Iq ReDim Preserve in_flist(fCount-1) R92R}=G! *:#Z+7x
] End Sub n!?r } n8 Qtnv#9%Vi "UpOY QQ:2987619807 6h@+?{F.
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