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摘要: CK0l9#g gxwo4., 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。 ~2@Lx3t$ ef=K_,
_ 背景: ^"9*
'vTtc 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。 UUeB;'E+ 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。 OR:[J5M) 图1. RPC Photonics工程漫射体结构及光束投射形状 {CtR+4KD 4*TmlY iib 步骤 (luKn&826 S,''>`w 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。 "X04mQn15 .Pe9_ZH$W 图2. RPC Photonics工程漫射体不同类型的散射数据 5{K}?*3hJ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) <_Eg?ePW# 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 DVlJ*A 例如下所示: I9Eu', Sample name: EDF-C1-56 ;#1Iiuh Merging data from file EDF-C1-56 0-0.txt x&Cp> +i Finished merging RPC data for sample EDF-C1-56 N2ied^* 0 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt d,0 }VaY=D 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Zp&@h-%YoD a. 创建一个新的散射库 (gwj)?: b. 散射模型命名 WA6!+Gy c. 改变散射模型为“Tabulated BSDF”. #]E(N~ d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ";x+1R.d e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 v.=/Y(J f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, uLQ g. 点击OK }fZ`IOf 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 -oyO+1V Wh(
|+rJ?Z #Yuvbb[ 脚本代码: D)Q)NI H={&3poBz '#Language "WWB-COM" "5Uh<X ^e Gue Option Explicit ;@3FF En6H%^d2 Sub Main qQ0C ? T6#CK
'Cleanup .fYZ*=P;c ClearOutputWindow() ?F7o!B rJJ[X4$ Print "Merging RPC Photonics BSDF Data Files" MFt*&%,JX SetTextColor(255,0,0) .]x2K-Sf Print "Note: Script should be located in the same folder as the BSDF TXT files." -|S]oJy Print "Note: Do not run this script multiple times without deleting the output file between executions." LD>\#q8a* SetTextColor(0,0,0) ;eL9{eF )IL
#>2n? 'Current directory of this script (should be the same as the text files being merged) B@y(. Dim cDir As String p\p\q(S"> cDir = MacroDir$ & "\" F {+`uG T ?Fcohz( 'Array which will be populated with the list of files to be merged ;CHi\+` 5 Dim fList() As String, curFile As String 'heJ"k? GetFileList( cDir, fList ) ])DX%$f bFS>) Print "" N K]B? Print "Files found for merging:" ccFn.($p?, For Each curFile In fList 7nU6k%_ % Print Chr(9) & curFile l_rn++ Next h#r^teui) &fC!(Oy 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. . @q-B+Eg Dim nameArray() As String, sampName As String b5G}3)'w nameArray = Split(fList(0)," 0-0.txt") !y:%0{l sampName = nameArray(0) OZY, @c Print "" 'XrRhF
( Print "Sample name: " & Chr(9) & sampName N6OMYP1 N2'qpxOLI 'Open an output file and write the FRED header data {c?JuV4q? Dim outFile As String Ny- [9S-< outFile = cDir & sampName & "_FRED.txt" !$;a[Te Open outFile For Output As #1 I04jjr:< Print #1, "type bsdf_data" RyJ 1mAC Print #1, "format angles=deg bsdf=value scale=1"
-t2T(ha a ]Eg!Q 'Loop the file list, skip the two header lines and write the remaining data to file iD38\XNMV Dim lineArray() As String, curLine As Long g>rp@M For Each curFile In fList YTQt3=1ii Print "Merging data from file " & curFile l>gI&1)% ReadFile( cDir & curFile, lineArray ) LVJI_ O{fH For curLine = 2 To UBound(lineArray) f3j{V N Print #1, lineArray(curLine) 9>zcBG8f Next 1=sXdcy; Next /M;#_+VK< fKC3-zm 'Close the output file !Z!g:II
/ Close #1 im} ?rY Zn=T#o Print "Finished merging RPC data for sample " & sampName VGHWNMT Print "FRED formatted data file: " & Chr(9) & outFile =*qD4qYA End Sub 8P7"&VYc8 ?"#%SKm 'Utility function to read the contents of a file into an array of strings. u]
:m"LM Function ReadFile(ByVal fileName As String, _ Hs?e0Z=N ByRef lineArray() As String) As Long (&|_quP7O Jj~EiA ReadFile = -1 tWTKgbj( Dim oFSO As Object FLg*R/ Set oFSO = CreateObject("Scripting.FileSystemObject") =deMd`=J Erase lineArray l0&EZN0V2 ]5~s"fnG Dim fid As Long ?Xdak|?i If oFSO.fileexists( fileName ) Then BqDKT fid = FreeFile() 9a\nszwa Open fileName For Input As fid Xs&TJ8a lineArray = Split(Input(LOF(fid), fid), vbCrLf) [,n c Close fid ~ ~uAc_ End If >Vy>O&r Set oFSO = Nothing b2 _Yu^ Return UBound( lineArray ) alh >"9~! aQ^umrj@?9 End Function -9RDr\&`( v_e9}yI Sub GetFileList( ByVal in_dir As String, _ )jWOP,| ByRef in_flist() As String ) 1O].v&{ 6sIL.S~c) 'Redimension the file list array 3nT
Z)L } Erase in_flist 43?^7_l- y;mj^/SxK 'Tracks how many files are found Pe C7 Dim fCount As Long !O\;Nua fCount = 0 [E#UGJ@ [."[pY 'Recurse directory and search for text files 8WE{5#oi Dim f As String %Qg+R26U f = Dir$(in_dir & "*.txt") 5es[Ph|K5 While f <> "" :o:e,WKxb ReDim Preserve in_flist(fCount) n JPyM/p in_flist(fCount) = f 1qV@qz fCount += 1 H|cNH= f = Dir$() >!_Xgw Wend 1n%?@+W ReDim Preserve in_flist(fCount-1) 1B),A~Ip ;8!Z5H End Sub e h,~^x5 0]D0{6x8 UhIDRR QQ:2987619807 Fnk_\d6Ma
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