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摘要: e?bYjJq l^J75$7 RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 ,
*qCf@$I dz>;<&2Z 背景: !.1%}4@Q] 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。 ^`f*'Z 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。 ;WL1B 图1. RPC Photonics工程漫射体结构及光束投射形状 wW?,;B'74 6n1rL (6v(9p 步骤 E2L(wt}^ Vx_rc%' 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。 G;3~2^lB\ D|qk_2R% 图2. RPC Photonics工程漫射体不同类型的散射数据 lt$zA%`odc 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ~el3I=KC} 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 #}^-C&~ 例如下所示: |
nJZie8m Sample name: EDF-C1-56 *Ywpz^2?: Merging data from file EDF-C1-56 0-0.txt 1+`l7'F Finished merging RPC data for sample EDF-C1-56 0N=X74 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt .lhn;*Yi 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 {2`=qt2 a. 创建一个新的散射库 drwgjLC+ b. 散射模型命名 ;d$qc<2uA c. 改变散射模型为“Tabulated BSDF”. p
(FlR?= S 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 ) p1c3Q$>i e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 FZiW|G f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, c.\O/N
g. 点击OK G1 o70 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 I &* _,d ?t@v&s ~tB;@e 脚本代码: ;DnUQj dMx4ykrR '#Language "WWB-COM" N?dvuB e7u^mJ Option Explicit *sQcg8{^ 0i[zup Sub Main zq5'i!s !0 m"c :"I6 'Cleanup ~#\i!I;RY} ClearOutputWindow() PCc|}*b EPW7+Ve Print "Merging RPC Photonics BSDF Data Files" weMww,: ^[ SetTextColor(255,0,0) Wi n8LOC Print "Note: Script should be located in the same folder as the BSDF TXT files." CGw--`#\ Print "Note: Do not run this script multiple times without deleting the output file between executions." 7:=5"ScV SetTextColor(0,0,0) URcR }2)DPP:ic 'Current directory of this script (should be the same as the text files being merged) }W)=@t Dim cDir As String N12:{U cDir = MacroDir$ & "\" *0Gz)' NkxCs 'Array which will be populated with the list of files to be merged $N$ FtpB Dim fList() As String, curFile As String p<WFqLe(": GetFileList( cDir, fList ) 3HyhEVR-#~ YEjY8]t Print "" !/K8xD$ Print "Files found for merging:" 151tXSzLT For Each curFile In fList F)$K Print Chr(9) & curFile 'UM!*fk7C Next ghk5rl$ H'RL62! 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. !rxp?V n - Dim nameArray() As String, sampName As String ;)DzCc/ nameArray = Split(fList(0)," 0-0.txt") tqOi
x/ sampName = nameArray(0) j_?cpm{~ml Print "" zvv:dC/p< Print "Sample name: " & Chr(9) & sampName k7_I$<YDj F>|9 52 'Open an output file and write the FRED header data V'Y{v Dim outFile As String )Du-_Z outFile = cDir & sampName & "_FRED.txt" ;i#LIHJ Open outFile For Output As #1 go)p%}s Print #1, "type bsdf_data" juToO Print #1, "format angles=deg bsdf=value scale=1" MBk"KF P#GD?FUc 'Loop the file list, skip the two header lines and write the remaining data to file 7x.%hRk Dim lineArray() As String, curLine As Long @kngI7=E For Each curFile In fList r
-f Print "Merging data from file " & curFile >3;^l/2c ReadFile( cDir & curFile, lineArray ) h"QbA" For curLine = 2 To UBound(lineArray) FN"rZWM Print #1, lineArray(curLine) nYv#4* Next >L2*CV3p Next zCXqBuvu1 `rWB`q|i<
'Close the output file ((3t: Close #1 4".J/I5u #dJ 2Q_2 Print "Finished merging RPC data for sample " & sampName #t71U a Print "FRED formatted data file: " & Chr(9) & outFile 4sY[az End Sub K, (65>86; xi {| 'Utility function to read the contents of a file into an array of strings. >M^&F6 Function ReadFile(ByVal fileName As String, _ 'ND36jHcRD ByRef lineArray() As String) As Long }6~)bLzI} `ypL]$cW ReadFile = -1 qR,.W/eS8 Dim oFSO As Object 5 Rz/Ri\c= Set oFSO = CreateObject("Scripting.FileSystemObject") $>vy(Y Erase lineArray iV)ac\ HY;oy( Dim fid As Long oW'POAr If oFSO.fileexists( fileName ) Then D?u` fid = FreeFile() l=Wd,$\ Open fileName For Input As fid A|vP$zy lineArray = Split(Input(LOF(fid), fid), vbCrLf) *m_93J Close fid t!l%/$- End If S!j^|! Set oFSO = Nothing Fe="EDh Return UBound( lineArray ) G:+16XCra me. /o(!? End Function ^tE_LL+ji| Y$8; Gm<) Sub GetFileList( ByVal in_dir As String, _ AUAI3K? ByRef in_flist() As String ) CX+9R3pa R<&FhT] 'Redimension the file list array
[,7-w Erase in_flist 6+%-GgPf x}"Q8kD 'Tracks how many files are found #\b ;2> Dim fCount As Long jfSg){ fCount = 0 w`#fH E/"SU*Co 'Recurse directory and search for text files rA#s Dim f As String 94z8B;+H] f = Dir$(in_dir & "*.txt") ]18Ucf While f <> "" *]!l%Uf% ReDim Preserve in_flist(fCount) fOW_h in_flist(fCount) = f F"BL#g66 fCount += 1 eUs-5
L f = Dir$() X8b#[40: Wend 6F ;Or ReDim Preserve in_flist(fCount-1) WD;)VsP 1 ;Ju] End Sub 0#=W#Jl>
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