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+,gI| j_H{_Ug 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。 7AX<>^ "W?k~.uw 背景: !LVWggk1 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。 i-vhX4:bd 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。 kVCSFF* 图1. RPC Photonics工程漫射体结构及光束投射形状 x}?y@.sn8 EgFV I QS| 步骤 f
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g8SK 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。 <=l!~~% +^iUY%pm 图2. RPC Photonics工程漫射体不同类型的散射数据 !;x 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) wWKC.N 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 @kenv3[Lc 例如下所示: /QZnN?k Sample name: EDF-C1-56 xa[<k>r3 Merging data from file EDF-C1-56 0-0.txt ?Lbwo<E Finished merging RPC data for sample EDF-C1-56 rbHrG<+7zO FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt I3uaEv7OZc 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s/Fc7V!; a. 创建一个新的散射库 (`5No:?v< b. 散射模型命名 Oz#$x c. 改变散射模型为“Tabulated BSDF”. w}c1zpa d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) I,(m\NalK e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 DN2K4%cM%' f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, r :{2}nE g. 点击OK 2Vxr 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 5)+(McJC mT
<4@RrB WO?EzQ ? 脚本代码: ,B(UkPGT f ?_YdVZ '#Language "WWB-COM" (C={/waJ CkE@Ll3Z Option Explicit Qw!cd-zc ^>gRK*, Sub Main 'S@% @>,3l;\Zh 'Cleanup -==@7*x!Z ClearOutputWindow() +Pd&YfU9 Q#wASd. Print "Merging RPC Photonics BSDF Data Files" .Qg!_C SetTextColor(255,0,0) z9}rT<hy Print "Note: Script should be located in the same folder as the BSDF TXT files." ;{
u{FL Print "Note: Do not run this script multiple times without deleting the output file between executions." {9vvj SetTextColor(0,0,0) <"{Lv)4 L MC-1 'Current directory of this script (should be the same as the text files being merged) R/R[r> 1)6 Dim cDir As String yw^t6E cDir = MacroDir$ & "\" %Qgo0 B(wk $2 'Array which will be populated with the list of files to be merged kbJ/7 Dim fList() As String, curFile As String pN6!IxN$ GetFileList( cDir, fList ) -sm{Hpf_b SL" ;\[uI Print "" 58,_ Print "Files found for merging:" `e .;P For Each curFile In fList M7^PWC Print Chr(9) & curFile hSSF] Next Ap9CQ h=! GzWmXm 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. :BKY#uH~ Dim nameArray() As String, sampName As String XL c&7 nameArray = Split(fList(0)," 0-0.txt") 767xCP sampName = nameArray(0) $'btfo4H Print "" "2;$?*hO# Print "Sample name: " & Chr(9) & sampName b)J(0,9`G" ~z#Faed=a 'Open an output file and write the FRED header data {\[u2{ Dim outFile As String <Z{\3X^ outFile = cDir & sampName & "_FRED.txt" m:5 *:Ii. Open outFile For Output As #1 FKY|xG9 Print #1, "type bsdf_data" )[yM4QFl Print #1, "format angles=deg bsdf=value scale=1" ?1?D[7$ !^cQPX2< 'Loop the file list, skip the two header lines and write the remaining data to file gm~Ka%O|F Dim lineArray() As String, curLine As Long $J"}7+ For Each curFile In fList I&Q.MItW Print "Merging data from file " & curFile I$xfCu ReadFile( cDir & curFile, lineArray ) |(N4ZmTm For curLine = 2 To UBound(lineArray) 6DqV1' Print #1, lineArray(curLine) #X'!wr|- Next <\!+J\YTA Next %>`0hk88 LL|$M;S
'Close the output file pqFgi_2m Close #1 O&!>C7 TV\21 Print "Finished merging RPC data for sample " & sampName 5jD2%"YUV Print "FRED formatted data file: " & Chr(9) & outFile J5h;~l!y End Sub -'3~Y
2# o#gb+[ 'Utility function to read the contents of a file into an array of strings. r7o63] Function ReadFile(ByVal fileName As String, _ 8X!^ 2B}J ByRef lineArray() As String) As Long eE5U|y)_ hd1(q33 ReadFile = -1 <iVn!P Dim oFSO As Object d]6.$"\"p Set oFSO = CreateObject("Scripting.FileSystemObject") \M(0@#-$C Erase lineArray ++D-,>. 7y.$'< Dim fid As Long E9TWLB5A)( If oFSO.fileexists( fileName ) Then zC#[ fid = FreeFile() GhpVi<FL Open fileName For Input As fid fBBNP) lineArray = Split(Input(LOF(fid), fid), vbCrLf) W- 5Z"m1I Close fid +LeZjA[ End If e2CjZ" C Set oFSO = Nothing 1^^<6e Return UBound( lineArray ) `K37&b |