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摘要: 0 It[Pa qG )&jE<C0 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。 l(o;O.dLt @Czj] t` 背景: :J
7p=sX 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。 ].A>ORS/ 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。 a>_Cxsb&` 图1. RPC Photonics工程漫射体结构及光束投射形状 Xp_3EQl X+R?>xq{=h :!fP~(R'm 步骤 'N7AVj G!%Cc0d"7 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。 (toN??r TgDx3U[ 图2. RPC Photonics工程漫射体不同类型的散射数据 ;z>?-
j 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) #3+-vyZm 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 K6 {0`'x 例如下所示: %-A #7\ Sample name: EDF-C1-56 b*AL,n? Merging data from file EDF-C1-56 0-0.txt 2c%*u {=: Finished merging RPC data for sample EDF-C1-56 y*f5_ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt |afzW=8' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ZRD@8'1p a. 创建一个新的散射库 r@|{m QOxa b. 散射模型命名 =7*k>]o c. 改变散射模型为“Tabulated BSDF”. !yfQ^a_O 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 ) gG>|5R0 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。 iJ7?6)\ 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, &*w)/W g. 点击OK g_T[m* 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q\!0V@$ ,hggmzA~ [6$n 脚本代码: GfG!CG^% {[i
37DN '#Language "WWB-COM" O<H5W|cM wM2[i Option Explicit >f ! *j`{ K Sub Main Fq-AvU oD@~wcMIT0 'Cleanup bPe|/wp ClearOutputWindow() ^hMJNy&R pOe"S Print "Merging RPC Photonics BSDF Data Files" mvCH$}w8& SetTextColor(255,0,0) RKt#2%FFO Print "Note: Script should be located in the same folder as the BSDF TXT files." hxedQvW Print "Note: Do not run this script multiple times without deleting the output file between executions." aYmC LLj SetTextColor(0,0,0) }uCC~ <^ ;I#f:UQ 'Current directory of this script (should be the same as the text files being merged) :*/'W5iM Dim cDir As String p>O>^R cDir = MacroDir$ & "\" H J8rb RTEzcJ> 'Array which will be populated with the list of files to be merged AW XBk+ Dim fList() As String, curFile As String C
`>1x`n GetFileList( cDir, fList ) \?|FB~.Ry tlz+!> Print "" z-Ndv;: Print "Files found for merging:" X=W.{? For Each curFile In fList ]:6M!+?( Print Chr(9) & curFile `L. kyL Next 2brxV'tk 2,3pmb 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. +TWk}#G Dim nameArray() As String, sampName As String $4&%<'l3I nameArray = Split(fList(0)," 0-0.txt") k4AF
.U`I sampName = nameArray(0) y\xa<!:g Print "" ??7c9l5, Print "Sample name: " & Chr(9) & sampName ?JinX'z \'BA}v
&/ 'Open an output file and write the FRED header data bH7 lUS~ Dim outFile As String q0>@!1Wb outFile = cDir & sampName & "_FRED.txt" P`HDQ/^O
Open outFile For Output As #1 `F^~*FnR,B Print #1, "type bsdf_data" wS)2ymRg Print #1, "format angles=deg bsdf=value scale=1" 9CxFj)#5F whoQA}X> 'Loop the file list, skip the two header lines and write the remaining data to file }%@q; "9` Dim lineArray() As String, curLine As Long gZ^'hW-{ For Each curFile In fList s_p\
bl. Print "Merging data from file " & curFile h3<L,Olp ReadFile( cDir & curFile, lineArray ) S]O0zv^} For curLine = 2 To UBound(lineArray) a9"1a' Print #1, lineArray(curLine) zD9gE Next Kz>Bw;R( Next Y]33:c_;Mo 'Y%@fZf x 'Close the output file =u.jZ*u]WT Close #1 ,8Yc@P_O s9p~ Print "Finished merging RPC data for sample " & sampName j$5S_]2 Print "FRED formatted data file: " & Chr(9) & outFile qpCNvhi End Sub JJ+A+sfdk )qL UHE= 'Utility function to read the contents of a file into an array of strings. C~r(*nr Function ReadFile(ByVal fileName As String, _ a
St ByRef lineArray() As String) As Long /|HVp z87_/(nu ReadFile = -1 NY,ZTl_ Dim oFSO As Object oQS_rv\Ber Set oFSO = CreateObject("Scripting.FileSystemObject") / p PSo Erase lineArray q5UD!&W eBs4:R_i Dim fid As Long a*g7uaoP If oFSO.fileexists( fileName ) Then 6
#vc"5@M fid = FreeFile() 8F;f&&L"y Open fileName For Input As fid &-hz&/A, lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6~rO( Close fid !SxZN d v End If W7
.Y`u[ Set oFSO = Nothing |_A DG
Return UBound( lineArray ) f0h^ULd v[*&@aW0n End Function p[J 8
r{' XeJ|Z)qZ Sub GetFileList( ByVal in_dir As String, _ J,&B ByRef in_flist() As String ) NF0=t}e 3SMb#ce*o 'Redimension the file list array 0)^$9Z Erase in_flist {$ (X,E I.qP$ j 'Tracks how many files are found yW!+:y_N_ Dim fCount As Long d${RZ}/ fCount = 0 D rMG{Yiu e]qbh_A 'Recurse directory and search for text files KBO{g:" Dim f As String ]-D&/88`` f = Dir$(in_dir & "*.txt") 4P(ysTuM While f <> "" ?;c&5'7ct ReDim Preserve in_flist(fCount) CL%+`c0 in_flist(fCount) = f 3ZhB
8 P fCount += 1 DClV&\i=o f = Dir$() &AS<2hB Wend Z`9yGaTO ReDim Preserve in_flist(fCount-1) j&qJK,~ @=0O'XM End Sub `Qrrnq [tP6FdS/M= "92Z"I~1 QQ:2987619807 UyWKE<
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