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摘要: I8%'Z>E( xY'YbHFz 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。 WT
{Cjn S+xGHi) 背景: Gc!{%x 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。 wG[l9)lz 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。 |Gs-9+'y 图1. RPC Photonics工程漫射体结构及光束投射形状 Jsnmn$C -Jrc'e4K sF3
l##Wv 步骤 :3*oAh8| 0|Ft0y`+ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 R]sjG< 6)<o O( 图2. RPC Photonics工程漫射体不同类型的散射数据 dZYJ(7% 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) vHe.+XY 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 B;7s ]R 例如下所示: 43Uy<%yb>} Sample name: EDF-C1-56 z}N^`_ * Merging data from file EDF-C1-56 0-0.txt %t|2GIu Finished merging RPC data for sample EDF-C1-56 ;S27m]Q? FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt "lzg@=$|) 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0 S8{VZpy a. 创建一个新的散射库 ZS>/ 5 b. 散射模型命名 "m)O13x c. 改变散射模型为“Tabulated BSDF”. l+X^x%EA 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 ) um;U;%?Q 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。 P3FpU<OBwp 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, "MP{z~Mmj g. 点击OK Yy~ Dg 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2-2LmxLG pnb$lpxt d}CMX$1 脚本代码: XxQ2g&USk 'N/%SRk '#Language "WWB-COM" U]&%EqLS F+^[8zK^ Option Explicit $4)guG) [/^g) ^s: Sub Main 2YEn)A@8 l{{ #tW 'Cleanup *hgsS~ ClearOutputWindow() j*\MUR= \aRB Print "Merging RPC Photonics BSDF Data Files" k)_#u;qmG SetTextColor(255,0,0) Y{{,62D Print "Note: Script should be located in the same folder as the BSDF TXT files." &G,v*5N8$K Print "Note: Do not run this script multiple times without deleting the output file between executions." t?&ajh SetTextColor(0,0,0) L7="! I n8C {Okr 'Current directory of this script (should be the same as the text files being merged) \05C'z3] Dim cDir As String aa3YtNpP cDir = MacroDir$ & "\" 3p#^#1/_ IiU|@f~k 'Array which will be populated with the list of files to be merged z$,hdZ] Dim fList() As String, curFile As String SK2pOZN GetFileList( cDir, fList ) "K]4j]yU ~_6rD`2cJ Print "" #jR?C9&!( Print "Files found for merging:" ld0WZj
For Each curFile In fList /;[')RO` Print Chr(9) & curFile 0(.C f.B~ Next I!%@|[ Ow 8;bOw 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. hD=D5LYAZ Dim nameArray() As String, sampName As String |LhuZ_;1xo nameArray = Split(fList(0)," 0-0.txt") g-`NsqzD sampName = nameArray(0) '/@VG_9L] Print "" -#hl&^u$ Print "Sample name: " & Chr(9) & sampName 'c]&{-w<i iE{ SqX 'Open an output file and write the FRED header data EkPSG&6RZ Dim outFile As String iWsIc\!+, outFile = cDir & sampName & "_FRED.txt" IEj`:]d Open outFile For Output As #1 ={d\zjI$ Print #1, "type bsdf_data" gNBI?xs`p Print #1, "format angles=deg bsdf=value scale=1" D=+sD"<| GR9F^Y) K{ 'Loop the file list, skip the two header lines and write the remaining data to file ' 1IH^<b Dim lineArray() As String, curLine As Long e<pojb1Q For Each curFile In fList (yVI<Os{a Print "Merging data from file " & curFile 3J{'|3x ReadFile( cDir & curFile, lineArray ) @B <_h+ For curLine = 2 To UBound(lineArray) qz):YHxT]n Print #1, lineArray(curLine) 4+Kc Next L T!X|O. Next LPClE5 P=GM7 'Close the output file :I8t}Wg Close #1 owB)+ NiF*h~q Print "Finished merging RPC data for sample " & sampName @A%`\Ea% Print "FRED formatted data file: " & Chr(9) & outFile 4O'ho0w7 End Sub TW$^]u~v q
Sah _N 'Utility function to read the contents of a file into an array of strings. ^YV[1~O Function ReadFile(ByVal fileName As String, _ _,QUH" ByRef lineArray() As String) As Long Ea1>]V )eV]M~K: ReadFile = -1 #k6T_ki Dim oFSO As Object 1U!CD-%( Set oFSO = CreateObject("Scripting.FileSystemObject") !cZIoz Erase lineArray U/;Vge8{ mv_-|N~ Dim fid As Long 7(-<x@ e If oFSO.fileexists( fileName ) Then K, Vl.-4? fid = FreeFile() _`_$UMK; Open fileName For Input As fid J=Z"sU= lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3FfS+q*3S Close fid L!RLw4
End If Z(cgI5Pu
Set oFSO = Nothing n$8A"'.M Return UBound( lineArray ) +VDB\n e~1??k.;= End Function {[eY/)6H CS Sub GetFileList( ByVal in_dir As String, _ +a{>jzR ByRef in_flist() As String ) ^[6AOz+L X|:O`b$G 'Redimension the file list array {Ffr l(* Erase in_flist uQ}kq7gd .#SWfAb2h 'Tracks how many files are found rx<fjA% Dim fCount As Long pE#0949 fCount = 0 4R.#=]F !nVuvsbv 'Recurse directory and search for text files -Cl0!}P4I Dim f As String !
d(,t[cV f = Dir$(in_dir & "*.txt") 8GX@76o While f <> "" qohUxtnTK> ReDim Preserve in_flist(fCount) wiZK-#\x in_flist(fCount) = f "xKJ?8
fCount += 1 g~]FI f = Dir$() {|50&]m Wend !^%b|=[ ReDim Preserve in_flist(fCount-1) :'03*A_[ k&*=:y} End Sub MZ.Jkf(
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