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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。 5B+>28G% {Mt4QA5iZ 背景: tz(\|0WDQ 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。 *&VH!K#@{ 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。 k(Z+(Y'{q~ 图1. RPC Photonics工程漫射体结构及光束投射形状
oObm5e*Z vfG4PJ 6 XW!a?aLNX 步骤 & i,on6
$ t' . 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。 r81YL P.bBu 图2. RPC Photonics工程漫射体不同类型的散射数据
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S^) 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) :[#g_*G@p 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 p7b`Z>} 例如下所示: q$vATT Sample name: EDF-C1-56 ~RSOUrR Merging data from file EDF-C1-56 0-0.txt Eq>3|(UT Finished merging RPC data for sample EDF-C1-56 4_3O?IY FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt -!E ))|A 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3`@alhD' a. 创建一个新的散射库 f&+=eUp b. 散射模型命名 N>z<v\` c. 改变散射模型为“Tabulated BSDF”. SJY<#_b d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Ux_ tHyc/ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 fFD:E} >5 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, neW_mu;~Z g. 点击OK e(/~;"r{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 G#.(%, Uf^zA/33 !a&@y#x 脚本代码: 5>.)7D% 8>.l4:` '#Language "WWB-COM" 4^1B'>I &Mz3CC6 Option Explicit /H+br_D9 g0 ec- Sub Main 6Q]c]cCu +RexQE 'Cleanup xEBiBskd ClearOutputWindow() 2`(-l{3 Uq/#\7/rL Print "Merging RPC Photonics BSDF Data Files" \tFg10 SetTextColor(255,0,0) d#:&Uw Print "Note: Script should be located in the same folder as the BSDF TXT files." +pU\;x Print "Note: Do not run this script multiple times without deleting the output file between executions." }>vf(9sF` SetTextColor(0,0,0) j&(2ze:=*$ #~um F%# 'Current directory of this script (should be the same as the text files being merged) A:Z$i5%' Dim cDir As String 0-~Y[X"9. cDir = MacroDir$ & "\" 4`@]jm t ZUZNKODW 'Array which will be populated with the list of files to be merged G5W6P7-<X Dim fList() As String, curFile As String *<*{gO?Q4 GetFileList( cDir, fList ) -|^}~yOx0= *z4n2"<l Print "" L-_dq0T Print "Files found for merging:" TQm x$ For Each curFile In fList t
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?Ok Print Chr(9) & curFile ")|3ZB7>* Next j:D@X=| p2}$S@GD 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. %&KJtKe Dim nameArray() As String, sampName As String grEmp9Q ? nameArray = Split(fList(0)," 0-0.txt") XQ.czj sampName = nameArray(0) :+ksmyW Print "" 7kU:91zR Print "Sample name: " & Chr(9) & sampName Ms5m.lX Z;shFMu 'Open an output file and write the FRED header data Bb[%?~
E! Dim outFile As String sZFIQ)b9 outFile = cDir & sampName & "_FRED.txt" p
D!IB`cA4 Open outFile For Output As #1 %C=^
h1t% Print #1, "type bsdf_data" K7}EL|Kx Print #1, "format angles=deg bsdf=value scale=1" KNU/Kc# 24{!j[,q@ 'Loop the file list, skip the two header lines and write the remaining data to file V-a/%_D Dim lineArray() As String, curLine As Long .{D[!Dp#h For Each curFile In fList ?&Si P-G Print "Merging data from file " & curFile @`2<^-r\ ReadFile( cDir & curFile, lineArray ) jI@0jxF For curLine = 2 To UBound(lineArray) ]Po9a4w# Print #1, lineArray(curLine) SeAokz> Next 5)4*J. Next 0'O; H[nrl ]xQPSs_ 'Close the output file X0
&1ICZ Close #1 V x1C4 P<GY"W+rR Print "Finished merging RPC data for sample " & sampName P0U=lj/b Print "FRED formatted data file: " & Chr(9) & outFile r$=MBeT End Sub "m +Eu|{ yA*~O$~Y 'Utility function to read the contents of a file into an array of strings. PETrMu< Function ReadFile(ByVal fileName As String, _ E :*!an ByRef lineArray() As String) As Long 1\q(xka{ XOzPi*V** ReadFile = -1 5sC{5LJzC Dim oFSO As Object `L`*jA+_ Set oFSO = CreateObject("Scripting.FileSystemObject") 9 m&"x/k Erase lineArray /3:R{9S% Ous[{" -J Dim fid As Long (V@g?|LZ If oFSO.fileexists( fileName ) Then b_-ESs]g fid = FreeFile() 4xhV
+Y Open fileName For Input As fid QQPbKok> lineArray = Split(Input(LOF(fid), fid), vbCrLf) rz+G]J Close fid %@q52ZQ End If QlIg'B6 Set oFSO = Nothing CF9a~^+% Return UBound( lineArray ) t/WauY2JUC N( E\ End Function `g6XVa*%# h>= e<H?f Sub GetFileList( ByVal in_dir As String, _ P{5p'g , ByRef in_flist() As String ) &W