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摘要: yG'
5: La2f]+sV 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。 ;b`kN;s Z|#G+$"QV 背景: KgH_-REN Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 Jkx_5kk/\ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 *'-[J 2 图1. RPC Photonics工程漫射体结构及光束投射形状 "W b>y*S ]/#3 P wbpz, 步骤 kEYkd@{ (v,g=BS, 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 6"oG
bte On~w` 图2. RPC Photonics工程漫射体不同类型的散射数据 F(;=^w 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) (rieg F 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 T5_/*`F 例如下所示: 20,}T)}Tm Sample name: EDF-C1-56 Op_(10| Merging data from file EDF-C1-56 0-0.txt WvoJ^{\4N* Finished merging RPC data for sample EDF-C1-56 !hugn6 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt H3xMoSs 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3j6Am{9 a. 创建一个新的散射库 "$I8EW/1 b. 散射模型命名 ,%T
sfB c. 改变散射模型为“Tabulated BSDF”. <~bvfA= 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 ) ii5dTimRJ 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。 l9Av@| 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, Mp3nR5@d$ g. 点击OK 0sP*ChY5S 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "Ng%"Nz grxlGS~Q D & Bdl5g 脚本代码: 8U)*kmq x+bC\,q '#Language "WWB-COM" 8zO;=R A7% Tr.u'b( Option Explicit O~OM.:al& XY,!vLjL Sub Main P_.zp5> B!x7oD9 'Cleanup ^2`*1el ClearOutputWindow() 7Tc^}Q !!<H*9]+W; Print "Merging RPC Photonics BSDF Data Files" [{q])P; SetTextColor(255,0,0) &a'mh Print "Note: Script should be located in the same folder as the BSDF TXT files." q\G7T{t$. Print "Note: Do not run this script multiple times without deleting the output file between executions." ?&JKq^9\I SetTextColor(0,0,0) X?$"dqA sZ>0*S 'Current directory of this script (should be the same as the text files being merged) \'6%Ld5km Dim cDir As String pG^>y0 cDir = MacroDir$ & "\" >x*ef]aS `hDH7u!U. 'Array which will be populated with the list of files to be merged Pyp#'du> Dim fList() As String, curFile As String LO;6g~(1 GetFileList( cDir, fList ) ID~}pEQ ncpNesB Print "" GGU>={D) Print "Files found for merging:" /[I#3| For Each curFile In fList qm6 X5T Print Chr(9) & curFile Ce:w^P+ Next r-AD*h@QZ ' 7H"ezt 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. eyuQ}R Dim nameArray() As String, sampName As String "XLFw;o nameArray = Split(fList(0)," 0-0.txt") K2gF;( sampName = nameArray(0) hO2W!68 Print "" hf:\^w Print "Sample name: " & Chr(9) & sampName =@P]eK/ YRyaOrl$< 'Open an output file and write the FRED header data g*;zVi Dim outFile As String bAEwjZ outFile = cDir & sampName & "_FRED.txt" P@0J! Open outFile For Output As #1 z:;yx Print #1, "type bsdf_data" nP0rg Print #1, "format angles=deg bsdf=value scale=1" ~{ucr#]C @!*I
mNMI 'Loop the file list, skip the two header lines and write the remaining data to file Z3f}'vr Dim lineArray() As String, curLine As Long ZU;nXqjc For Each curFile In fList xk7VuS* Print "Merging data from file " & curFile L=gG23U& ReadFile( cDir & curFile, lineArray ) jt0f*eYE8 For curLine = 2 To UBound(lineArray) )
D5JA` Print #1, lineArray(curLine) V6&6I Next U
U3o (Yq Next _q}^#- yeLd,M/I 'Close the output file EUbyQL Close #1 mZ g' Y o\%53w/ Print "Finished merging RPC data for sample " & sampName -d[Gy-
J Print "FRED formatted data file: " & Chr(9) & outFile =vsvx{o? End Sub P} w0= x b!&'cw 'Utility function to read the contents of a file into an array of strings. !$p E=~1C Function ReadFile(ByVal fileName As String, _ ,M Ugww!. ByRef lineArray() As String) As Long SP;1XXlL |(=b ReadFile = -1 #&Rx?V Dim oFSO As Object 1]"S? Set oFSO = CreateObject("Scripting.FileSystemObject") ri49r*_1 Erase lineArray usw(]CnH h*?]A Dim fid As Long q!WiX|P If oFSO.fileexists( fileName ) Then B.}j1Bb fid = FreeFile() NCVhWD21| Open fileName For Input As fid ++BQ==@ lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2BO"mc<#$ Close fid ,L; y>::1 End If 7 iQa)8, Set oFSO = Nothing v7<r-<I[ Return UBound( lineArray ) 5}2148 @%8$k[ End Function |$[.X3i rxOvYF Sub GetFileList( ByVal in_dir As String, _ 6 )lWuY]e ByRef in_flist() As String ) q:mqA$n x??H%'rP 'Redimension the file list array Wu)An Erase in_flist \"P$*y4Le ]?_V+F 'Tracks how many files are found =WK's8FB;8 Dim fCount As Long vofBS fCount = 0 b@B\2BT d!y_N&z|( 'Recurse directory and search for text files =<Ss&p> Dim f As String 10tt' : f = Dir$(in_dir & "*.txt") &(NW_<( While f <> "" VqS1n ReDim Preserve in_flist(fCount) o97*3W] in_flist(fCount) = f h5lngw fCount += 1 >[<f\BN| f = Dir$() B % Wend Z& bIjp ReDim Preserve in_flist(fCount-1) :`S\p[5 HFX,EE End Sub 58]t iP"
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