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摘要: Z$X2*k6PK bd_U%0)pi1 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。 9Vxsv*OR, ,8;;#XR3 背景: ,@R~y 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。 ,COSpq]6 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。 ^TVica 图1. RPC Photonics工程漫射体结构及光束投射形状 Yt++? $V]D7kDph* {(o\G"\<XY 步骤 @NlnZfMu ~ d/Doi 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 } !pC}m Os*,@N3t 图2. RPC Photonics工程漫射体不同类型的散射数据 DvF`KHsy 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) )+RGXVp 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 o(]kI?` 例如下所示: r9%4q4D?>9 Sample name: EDF-C1-56 _T6WA&;8 Merging data from file EDF-C1-56 0-0.txt 6JmS9ho Finished merging RPC data for sample EDF-C1-56 *1ekw#' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5Jp@n . 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 G<4H~1?P a. 创建一个新的散射库 JiDX|Q<c b. 散射模型命名 p !AQ c. 改变散射模型为“Tabulated BSDF”. |08 tQ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) N12K*P[! e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q6_!I42Y` f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, UB|Nx(V s g. 点击OK (jPN+yQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KG'4;Z5J x7L$x=8s KAjKv_6=g 脚本代码: @8DBLn w 7{D+\i '#Language "WWB-COM" }bIEW ho r}WV"/]p Option Explicit 5L42'gJ fH`P8?](x Sub Main FnP/NoZa> b}9K"GT 'Cleanup rMTtPuc2 ClearOutputWindow() $ZK4Ps -$ 4^w>An6 Print "Merging RPC Photonics BSDF Data Files" W+H27qsv SetTextColor(255,0,0) 8/-GrdyE Print "Note: Script should be located in the same folder as the BSDF TXT files." mz+>rc Print "Note: Do not run this script multiple times without deleting the output file between executions." ?T$i SetTextColor(0,0,0) wQ2'%T|t m589C+7 'Current directory of this script (should be the same as the text files being merged) ^ ^} Dim cDir As String X3!btxa%t cDir = MacroDir$ & "\" ?)",}XL6 [bJ"*^M) 'Array which will be populated with the list of files to be merged ~~;fWM ' Dim fList() As String, curFile As String }Da8S|)H GetFileList( cDir, fList ) gD _tBv _t:rWC"X Print "" aPcO9 Print "Files found for merging:" s8WA@)L For Each curFile In fList hs2f3;) Print Chr(9) & curFile ]0ouJY Next UrH^T;# `;hsOfo 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. bNevHKS Dim nameArray() As String, sampName As String 4oT25VH nameArray = Split(fList(0)," 0-0.txt") [k@D}p
x sampName = nameArray(0) A}~hc&J Print "" uTbI\iq Print "Sample name: " & Chr(9) & sampName +;Q& ^(N+s? 'Open an output file and write the FRED header data 6 [a CjW Dim outFile As String n6O1\}YB outFile = cDir & sampName & "_FRED.txt" =(Mv@eA" Open outFile For Output As #1 6DaH+ Print #1, "type bsdf_data" @2CYv> Print #1, "format angles=deg bsdf=value scale=1" \
CV(c] J0d +q! 'Loop the file list, skip the two header lines and write the remaining data to file qk~QcVg Dim lineArray() As String, curLine As Long +z>*m`}F For Each curFile In fList |ng[s6uf Print "Merging data from file " & curFile EK@yzJ% ReadFile( cDir & curFile, lineArray ) lr +Kwve For curLine = 2 To UBound(lineArray) gSZNsiH Print #1, lineArray(curLine) Q7"KgqpQ3 Next Tx/ Next ]=WJ%p1l p
tv 'Close the output file [5)1
4%
x Close #1 v^[tK2&v `Wn0v2@a(~ Print "Finished merging RPC data for sample " & sampName pF K[b Print "FRED formatted data file: " & Chr(9) & outFile xfkG&& End Sub [53@'@26 C(?>l.QGw 'Utility function to read the contents of a file into an array of strings. }YU#}Ip@ Function ReadFile(ByVal fileName As String, _ hB P]^~( ByRef lineArray() As String) As Long NZ{kjAd3c {'"A hiR/ ReadFile = -1 U6jlv3 Dim oFSO As Object O4\GL Set oFSO = CreateObject("Scripting.FileSystemObject") F8_pwJUpf- Erase lineArray $d,30hK ^w8H=UkP!+ Dim fid As Long :Q+rEjw+ If oFSO.fileexists( fileName ) Then `q7I;w+g fid = FreeFile() F mh;d*IT Open fileName For Input As fid nLto=tNUO lineArray = Split(Input(LOF(fid), fid), vbCrLf) H!Uy4L~> Close fid -T4?5T_ End If a=p3oh?%-O Set oFSO = Nothing (G#)[0<fX Return UBound( lineArray ) e<~uU9
lg1 4)JrOe&k End Function 4{CVBowi \dIIZSN Sub GetFileList( ByVal in_dir As String, _ 0u'2f`p* ByRef in_flist() As String ) C~'}RM mEz&:A 'Redimension the file list array >AN`L`%2 Erase in_flist Yi7`iC =zqOkC
h$ 'Tracks how many files are found SQ>.P Dim fCount As Long E`LML? fCount = 0 swi| uPR usG4!R 'Recurse directory and search for text files c#u-E6 Dim f As String P~ffgzP f = Dir$(in_dir & "*.txt") ouVR[w>V While f <> "" ,_u8y&<|I ReDim Preserve in_flist(fCount) 5y}}?6n+ in_flist(fCount) = f {-Yp~HQF fCount += 1 g3LAi#m f = Dir$() b=K Wend qa`bR%eH ReDim Preserve in_flist(fCount-1) FK@rZP bi#o1jR End Sub l:j9lBS hd/5*C{s yZmQBh$ QQ:2987619807 !x;T2l
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