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摘要: l+Wux$6U fJLl-H 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。 0fqcPi 'Dfs&sm 背景: n5QO'Jr%[ 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。 $1 ])>m_ct FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 H1-DK+Q: 图1. RPC Photonics工程漫射体结构及光束投射形状 #*A&jo'E k4sV6f ,l&?%H9q 步骤 !td!">r46e 0ca0-vY 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 %B@NW2ZQ[ ROkwjw 图2. RPC Photonics工程漫射体不同类型的散射数据 'dj3y/
k% 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) T, #-: } 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 u(Mbp$R'? 例如下所示: 0/QDfA? Sample name: EDF-C1-56 a?-J j\q Merging data from file EDF-C1-56 0-0.txt ,3?=W/Um4 Finished merging RPC data for sample EDF-C1-56 sPK ]:iC FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt DGJ:#UE 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 XoyxS:=>|[ a. 创建一个新的散射库 O<vBuD2 b. 散射模型命名 0L>3i8' c. 改变散射模型为“Tabulated BSDF”. EeYL~ORdi 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 ) _h1bVd- 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。 `v?hL~ 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, !/}4_s`, g. 点击OK x)?V{YAL 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 e, sS. `O7vPE ^6Aa^| 脚本代码: Jz''UJY/O >.SO2w '#Language "WWB-COM" +vZYuEq_ =)bOteWM Option Explicit IEm?'o: 7}xQ4M\u$ Sub Main Y's=31G@ G:e=9qTf 'Cleanup }zA|M9%E ClearOutputWindow() Yh]a4l0 Rc)]A&J Print "Merging RPC Photonics BSDF Data Files" "0!#De
SetTextColor(255,0,0) MO~T_6 Print "Note: Script should be located in the same folder as the BSDF TXT files." ky !ZJR Print "Note: Do not run this script multiple times without deleting the output file between executions." I6WHC* SetTextColor(0,0,0) M0m%S:2 %#%YU|4R 'Current directory of this script (should be the same as the text files being merged) >XZ2w_ Dim cDir As String _U*R_2aV cDir = MacroDir$ & "\" _
(b4|hJ' 7_Vd%<: 'Array which will be populated with the list of files to be merged j &[lDlI_ Dim fList() As String, curFile As String ~/4j&IG GetFileList( cDir, fList ) ,JH*l:7 WA}'[h Print "" ~H''RzN Print "Files found for merging:" z .lb(xQ For Each curFile In fList AYNz {9 Print Chr(9) & curFile `LFT"qnp Next ]UOzz1 {{A=^rr%C 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. |vi=h2* Dim nameArray() As String, sampName As String heF'7ezv# nameArray = Split(fList(0)," 0-0.txt") '\H
& EJ' sampName = nameArray(0) hpOY&7QUTD Print "" i_L u Print "Sample name: " & Chr(9) & sampName x^3K=l;N ;Qd'G7+ 'Open an output file and write the FRED header data 0Wd5s{S Dim outFile As String v-$X1s outFile = cDir & sampName & "_FRED.txt" j.Y!E<e4] Open outFile For Output As #1 >Dv=lgPF Print #1, "type bsdf_data" 7<jr0) Print #1, "format angles=deg bsdf=value scale=1" \U]<HEc^ 7OZ0;fK 'Loop the file list, skip the two header lines and write the remaining data to file 7T X$ Dim lineArray() As String, curLine As Long un6W|{4] For Each curFile In fList K0*er Print "Merging data from file " & curFile -b%' K}.C ReadFile( cDir & curFile, lineArray ) U&kdR+dB For curLine = 2 To UBound(lineArray) *[nS*D\: Print #1, lineArray(curLine) cL%eP. Next -}qay@cDt Next mznE Cy 9MRe? 'Close the output file /\jRr7 Cd Close #1 \XY2s&" p<a~L~xH6 Print "Finished merging RPC data for sample " & sampName Z_<Wr7D Print "FRED formatted data file: " & Chr(9) & outFile H_JT"~_2 End Sub j~2t^Qz
a;7gy419<p 'Utility function to read the contents of a file into an array of strings. =Oh/4TbW[ Function ReadFile(ByVal fileName As String, _ KG5B6Om5' ByRef lineArray() As String) As Long YcaLc_pUx :fG9p` ReadFile = -1 !Je!;mEvI Dim oFSO As Object kD+B8TrW Set oFSO = CreateObject("Scripting.FileSystemObject") NLWj5K)1P Erase lineArray h7\EN imS&N.*3m Dim fid As Long ]=^NTm, If oFSO.fileexists( fileName ) Then )N
^g0L fid = FreeFile() AQBr{^inH| Open fileName For Input As fid <CP't[ lineArray = Split(Input(LOF(fid), fid), vbCrLf) cRPy5['E Close fid l&Fx<
W End If `4]-B@
7_ Set oFSO = Nothing ;S>ml Return UBound( lineArray ) QEL3b4Vm 0.Nik^~ End Function 0Ioa;XgOn ! F&{I Sub GetFileList( ByVal in_dir As String, _ S1$& ByRef in_flist() As String ) :'dH)yO 7^8<[8 'Redimension the file list array k3"Y!Uha: Erase in_flist 9%uJ:c? Qgv-QcI{ 'Tracks how many files are found 0j~C6vp Dim fCount As Long wvSaq+N fCount = 0 s2+s1%^Ll G5 x%:,n 'Recurse directory and search for text files XAr YmO Dim f As String 0jwex f = Dir$(in_dir & "*.txt") w0t||qj^>" While f <> "" ~|)'vK8W ReDim Preserve in_flist(fCount) +l$BUX in_flist(fCount) = f ,}#l0BY fCount += 1 B1gBvss f = Dir$() Zz04Pz1 Wend aq,? ReDim Preserve in_flist(fCount-1) )![?JXf aV8]?E5G End Sub '.DFyHsq aTY\mKk ygp NMq#?X QQ:2987619807 tm}0kWx
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