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摘要: m^cr-' ULc oti=, 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。 (dD+?ZOO tiG=KHK%o 背景: ]-"~? 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。 9EzXf+f 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。 t"M&Yy 图1. RPC Photonics工程漫射体结构及光束投射形状 nIdB, USfpCRj9 [of{~ 步骤 ,jJ&x7ra8
FEj{/ 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:S/
?v C9zQ{G 图2. RPC Photonics工程漫射体不同类型的散射数据 {3=M-U~r 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) r&sm&4)p-5 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 5&a4c"fU 例如下所示: T0BFit6 Sample name: EDF-C1-56 3YT>3f!\
Merging data from file EDF-C1-56 0-0.txt ~]X4ru5,4 Finished merging RPC data for sample EDF-C1-56 kBolDPvBG FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q\>9PKK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ,grdl|Dg a. 创建一个新的散射库 -JOtvJIQI b. 散射模型命名 -o c@$*t c. 改变散射模型为“Tabulated BSDF”. zf-)c1$*r 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 ) g]au|$L4 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 /V@~Vlww f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, }T=0]u4, g. 点击OK cU
<T;1VQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 R3+y*<<e q#9JJWSs "@: b'm 脚本代码: ,{wA%Oy, MT{7I" '#Language "WWB-COM" I4'mU$)U 4oW6&1 Option Explicit VZ"W_U,
fNb2>1 Sub Main P.^%8L <Stfqa6FJ 'Cleanup lx9tUTaus/ ClearOutputWindow() p)l >bC?3 4+&4 Print "Merging RPC Photonics BSDF Data Files" t\LAotTF/ SetTextColor(255,0,0) _SU%ul Print "Note: Script should be located in the same folder as the BSDF TXT files." ^8dd Print "Note: Do not run this script multiple times without deleting the output file between executions." W rvSYqN SetTextColor(0,0,0) #wz1uw[pI! 9_yO6)` 'Current directory of this script (should be the same as the text files being merged) b+/XVEsr Dim cDir As String Fy1@B(V% cDir = MacroDir$ & "\" L"|4
v 9MfBsp}c 'Array which will be populated with the list of files to be merged &"!s +_ Dim fList() As String, curFile As String 'r`#u@TTZ GetFileList( cDir, fList ) p H&Tb4 GFM$1} Print "" r&F(VF0
6 Print "Files found for merging:" 5 :O7c Br For Each curFile In fList
L~F" Print Chr(9) & curFile }.md$N_F Next z'cVq}vl VQSwRL3B= 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. GilaON*pK. Dim nameArray() As String, sampName As String +#qW 0g nameArray = Split(fList(0)," 0-0.txt") Y1e>P sampName = nameArray(0) EOqvu=$6 Print "" bb<qnB Print "Sample name: " & Chr(9) & sampName &YMz3ugI z?o16o-: 'Open an output file and write the FRED header data aH@Ux?-} Dim outFile As String U)IW6)q outFile = cDir & sampName & "_FRED.txt" 7WZ).,qxY Open outFile For Output As #1 zY?GO"U" Print #1, "type bsdf_data" E]zTd$v6 Print #1, "format angles=deg bsdf=value scale=1" tK9_]663 K_\fO|<k 'Loop the file list, skip the two header lines and write the remaining data to file _-^bAr`z Dim lineArray() As String, curLine As Long O{b.-< For Each curFile In fList JNY;;9o Print "Merging data from file " & curFile i3C5"\y ReadFile( cDir & curFile, lineArray ) ,E&PIbDL1 For curLine = 2 To UBound(lineArray) Wi a%rm Print #1, lineArray(curLine) h\+U+?u Next x13t@b Next S`,(10Y qJq49}2 'Close the output file 8Ar5^.k Close #1 W<Ms0 M%dJqwH5{ Print "Finished merging RPC data for sample " & sampName 1pe eecE Print "FRED formatted data file: " & Chr(9) & outFile ?m&?BsW$) End Sub J*)Vpk @^g/`{j>J 'Utility function to read the contents of a file into an array of strings. |&JCf= Function ReadFile(ByVal fileName As String, _ *=]hc@ ByRef lineArray() As String) As Long pJM~'tlHV p-]vf$u ReadFile = -1 ]"'$i4I{R Dim oFSO As Object lq2Ah=FuN Set oFSO = CreateObject("Scripting.FileSystemObject") u,<#z0R|;$ Erase lineArray _D%aT6,G+( S\7-u\) Dim fid As Long ,sEu[m If oFSO.fileexists( fileName ) Then 5<o8prtB fid = FreeFile() r:h\{DVf Open fileName For Input As fid 9qIdwDRY lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1mT3$Z Close fid #:rywz+ End If w+ZeVZv!r Set oFSO = Nothing w2BIf[~t Return UBound( lineArray ) V!!E)I j{)_&|^{ End Function jq6BwUN nic7RN?F< Sub GetFileList( ByVal in_dir As String, _ 9
yH/5' ByRef in_flist() As String ) 0(A(Vb5J.T _M
n7zt1^ 'Redimension the file list array `%
sKF Erase in_flist A%H" a+ FI@!7@ 'Tracks how many files are found w6C0]vh Dim fCount As Long >kK;IF9h fCount = 0 Ns.b8Y JA!O,4 'Recurse directory and search for text files x!CCSM;q Dim f As String fVCpG~&t f = Dir$(in_dir & "*.txt") g_z%L?N While f <> "" ya7/&Z
)0 ReDim Preserve in_flist(fCount)
<^j,jX in_flist(fCount) = f '~?\NeO= fCount += 1 C3|(XChqC f = Dir$() yp%7zrU Wend c}9.Or`? ReDim Preserve in_flist(fCount-1) 98u$5=Z'/ l4c9.'6 End Sub CBC0X}_` &Q7vY Y{P0?` QQ:2987619807 C[h"w'A2
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