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摘要: 3uG5b8? *AR<DXEL 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。 \Pmk`^T z.HNb$; 背景: [F[<2{FQF Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 IFofFXv_ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 <9tG_ 图1. RPC Photonics工程漫射体结构及光束投射形状 \<x_96jt!\ xH#a|iT?( @zF:{=+]+ 步骤 VDjIs UUX B^~Bv!tHWr 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ,ri--< z2V8NUn 图2. RPC Photonics工程漫射体不同类型的散射数据 m+{: ^ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) )}\@BtcjA] 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 aEdJ ri 例如下所示: To%*)a Sample name: EDF-C1-56 59BHGvaF Merging data from file EDF-C1-56 0-0.txt 6FIoWG"x Finished merging RPC data for sample EDF-C1-56 :gaeb8`t FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt KqUSTR1e[ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 T KL(97)< a. 创建一个新的散射库 {59VS
Nl b. 散射模型命名 :42;c:8 5 c. 改变散射模型为“Tabulated BSDF”. U]EuDNkO{ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) `4$Qv'X* 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。 A<CXd t+t 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, <O)X89dFM g. 点击OK 1\{U<Oli 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 R6Z}/ m &~A*(+S T1!Gr!= 脚本代码: y{I[}$k _JIUds5 '#Language "WWB-COM" ^*ezj1 [d~bZS|(T( Option Explicit jP.b oj_u* jy@i(@Z Sub Main Nz3%}6F: o``>sBZOq 'Cleanup )^>XZ*eK ClearOutputWindow() !v4j`A;% AD%D ,l Print "Merging RPC Photonics BSDF Data Files"
{%~4RZA SetTextColor(255,0,0) 4'hcHdL9 Print "Note: Script should be located in the same folder as the BSDF TXT files." ?&<o_/`-H5 Print "Note: Do not run this script multiple times without deleting the output file between executions." )Z]y.W ) SetTextColor(0,0,0) J[Yg]6 `CEj 4 'Current directory of this script (should be the same as the text files being merged) <6O_t,K] Dim cDir As String h4.=sbzZ cDir = MacroDir$ & "\" U;Ll.BFP D<3V#Opw 'Array which will be populated with the list of files to be merged chMc(.cN0 Dim fList() As String, curFile As String ^N2M/B|0 GetFileList( cDir, fList ) Z*9]:dG:! PWN'.HQ Print "" i|]Va44 Print "Files found for merging:" b' oGt, For Each curFile In fList oYh<k Print Chr(9) & curFile Li-(p" Next G!VF*yW8 11y.z^ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [kuVQ$) Dim nameArray() As String, sampName As String *xo;pe)9 nameArray = Split(fList(0)," 0-0.txt") #DK3p0d sampName = nameArray(0) !MJe+. Print "" ,WB_C\.#XN Print "Sample name: " & Chr(9) & sampName 9kX=99kf[ D@\;@(
| 'Open an output file and write the FRED header data sId(PT^ Dim outFile As String 71.\`' outFile = cDir & sampName & "_FRED.txt" ^L-w(r62< Open outFile For Output As #1 z1'FmwT Print #1, "type bsdf_data" k8
;uC~L Print #1, "format angles=deg bsdf=value scale=1" ){ *fH_lG% 'Loop the file list, skip the two header lines and write the remaining data to file o!toO&= Dim lineArray() As String, curLine As Long h#m:Y~GoF For Each curFile In fList
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#Fl Print "Merging data from file " & curFile $ ~,}yh; ReadFile( cDir & curFile, lineArray ) %t~SOkx For curLine = 2 To UBound(lineArray) (e8G
( Print #1, lineArray(curLine) o`\.I&Ij Next Vp]D Next ]KXMGH_ "\/^/vn? 'Close the output file t`Y!"l Close #1 '{0[&i*
$' (QTEM Print "Finished merging RPC data for sample " & sampName <wt$Gglk Print "FRED formatted data file: " & Chr(9) & outFile /$9BPjO{ End Sub BU9J_rCIv )Ab6!"' 'Utility function to read the contents of a file into an array of strings. cZgMA8
F Function ReadFile(ByVal fileName As String, _ 2sqm7th ByRef lineArray() As String) As Long ',JrY) 2<'`^AO@ ReadFile = -1 Lvi[*une| Dim oFSO As Object gE@$~Q>M Set oFSO = CreateObject("Scripting.FileSystemObject") /BMtcCPG! Erase lineArray Ts(t:^
oe!:|ck< Dim fid As Long )_77>f% If oFSO.fileexists( fileName ) Then l@N;sI<O- fid = FreeFile() l801`~*gO Open fileName For Input As fid JAlU%n?R lineArray = Split(Input(LOF(fid), fid), vbCrLf) !8Z2X!$m{< Close fid 6X7s 4 End If g@@&sB-A" Set oFSO = Nothing F<Hqo>G Return UBound( lineArray ) sn-)(XU! J ;UBnCg End Function x"
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( Y5ogi) Sub GetFileList( ByVal in_dir As String, _ u R\m` ByRef in_flist() As String ) k7^R,.c@
c6Lif)4 'Redimension the file list array )?w&oIj5 Erase in_flist &:V@2_6" \Z)#lF|^ 'Tracks how many files are found T&r +G!2 Dim fCount As Long nW4Vct fCount = 0 hCzjC|EO~ W.A1m4l58R 'Recurse directory and search for text files E@w[ Dim f As String r^$\t0h(U8 f = Dir$(in_dir & "*.txt") Ue(r}* While f <> "" E'5Ajtw; ReDim Preserve in_flist(fCount) 2Co@+I[,4& in_flist(fCount) = f ajn-KG!A fCount += 1 "~u_\STn < f = Dir$() iQt!PMF. Wend R?
O-x9 ReDim Preserve in_flist(fCount-1) T H|?X0b u8Y~_)\MA End Sub ' _B_&is
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