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摘要: ;(TBg-LEK -L</,>p 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。 "JbFbcj N
y7VIh| 背景: 0 l
G\QT 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。 w~&bpCB! 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。 rL&585 图1. RPC Photonics工程漫射体结构及光束投射形状 MoO
jM&9 LHR%dt|M /,$6`V 步骤 ^5QSV\X ]'DtuT?Z 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ^V_vpr]}P W~Eq_J?I 图2. RPC Photonics工程漫射体不同类型的散射数据 mzfj!0zR* 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) fb&K.6" 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 _H<ur?G 例如下所示: :q0C$xF Sample name: EDF-C1-56 V92e#AR Merging data from file EDF-C1-56 0-0.txt xGPt5l<M& Finished merging RPC data for sample EDF-C1-56 !> FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6TlkPM$~2 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2pxl! a. 创建一个新的散射库 F#O.i, b. 散射模型命名 a:H}c9$% c. 改变散射模型为“Tabulated BSDF”. u
L/*,[}' 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 ) ATPc~f 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。 \E]s]ft;+ 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, P=(\3ok g. 点击OK SN\;&(?G 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [{f{E {SCwi;m f)?s.DvUB 脚本代码: s
<Ag8U8 D.)R8X '#Language "WWB-COM" V)_mo/D!D : ,LX3, Option Explicit 3#^xxEu q@r8V&-< Sub Main O`rAqO0F q#c\ 'Cleanup (LkGBnXE ClearOutputWindow() L#m1!+J 0waQw7
E Print "Merging RPC Photonics BSDF Data Files" Qm^N}>e SetTextColor(255,0,0) ,d&~#W] Print "Note: Script should be located in the same folder as the BSDF TXT files." Vdh5s 292h Print "Note: Do not run this script multiple times without deleting the output file between executions." G'#a&6 SetTextColor(0,0,0) bUU_NqUf*3 Wd3/Y/MD 'Current directory of this script (should be the same as the text files being merged) {UvZ Dim cDir As String 2{|
U cDir = MacroDir$ & "\" `~VV1 yLipuMNV 'Array which will be populated with the list of files to be merged ]* ': Dim fList() As String, curFile As String AL3zE=BL GetFileList( cDir, fList ) &5~bJ]P +p>tO\mo Print "" G %Wjtrpj Print "Files found for merging:" Z_ak4C For Each curFile In fList > ~J&i3 Print Chr(9) & curFile GbBcC#0 Next :
v<|y F P9SyQbcK 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. zxT&K| Dim nameArray() As String, sampName As String D-69/3 PvP nameArray = Split(fList(0)," 0-0.txt") [8l8m6 sampName = nameArray(0) ikw_t? Print "" bX=A77 Print "Sample name: " & Chr(9) & sampName
BJB'o [?.k 8;k 'Open an output file and write the FRED header data 65)/|j+ Dim outFile As String !J3g, p* outFile = cDir & sampName & "_FRED.txt" nB`pfg Open outFile For Output As #1 Jx.Jx~ Print #1, "type bsdf_data" E}b"
qOV Print #1, "format angles=deg bsdf=value scale=1" [(F.x6z) [59_n{S 1 'Loop the file list, skip the two header lines and write the remaining data to file tF
O27z@ Dim lineArray() As String, curLine As Long ApG_Gd. For Each curFile In fList X8GIRL)lJ Print "Merging data from file " & curFile ,1a6u3f, ReadFile( cDir & curFile, lineArray ) */u_RJ For curLine = 2 To UBound(lineArray) HX7"w
Print #1, lineArray(curLine) L^Fni~ Next ~Yb5FYE Next qa.nm4"6+ ;S7MP`o@ 'Close the output file 4`7N}$j#, Close #1 <V5(5gx u$X[= Print "Finished merging RPC data for sample " & sampName bd5\Rt Print "FRED formatted data file: " & Chr(9) & outFile MRV4D<NQ End Sub J4;w9[a$ si.ZTG9m 'Utility function to read the contents of a file into an array of strings. 4%Z! *W* Function ReadFile(ByVal fileName As String, _ bzF>Efza ByRef lineArray() As String) As Long B8:G1r5G/ NhU~'k ReadFile = -1 J NPEyC Dim oFSO As Object N^*%{[<5 Set oFSO = CreateObject("Scripting.FileSystemObject") }~DlOvsq Erase lineArray )+OI} mCb(B48]%X Dim fid As Long
a`
s2 z If oFSO.fileexists( fileName ) Then "jb`KBH%" fid = FreeFile() TWZ**S- Open fileName For Input As fid ; :4&nJ*qG lineArray = Split(Input(LOF(fid), fid), vbCrLf) EZ:pcnL{ Close fid MzM"r"u End If gFizw:l Set oFSO = Nothing `*g(_EZsS Return UBound( lineArray ) ~! ;*C
U*!q@g_ End Function ;|}N\[fk%]
c@7d4Jz Sub GetFileList( ByVal in_dir As String, _ NvW`x ByRef in_flist() As String ) _2xNio& Z$LWZg 'Redimension the file list array B52n'. Erase in_flist }Go?j#
! #I8)|p?P 'Tracks how many files are found LM\ H%=*L Dim fCount As Long Oi%\'biM fCount = 0 "\cDSiD l25_J.e 'Recurse directory and search for text files P{fT5K| Dim f As String &W+lwEu f = Dir$(in_dir & "*.txt") kl%%b"h' While f <> "" +O"!* ReDim Preserve in_flist(fCount) FjR/_GPo6 in_flist(fCount) = f @6h,#8# fCount += 1 IJa6W`} f = Dir$() fIe';a Wend >M~1{ ReDim Preserve in_flist(fCount-1) D+m#_'ocL iZY4+
X End Sub !ij
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