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摘要: 4L#q?]$ HU]Yv+3 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。 _YzItge* LY}%|w 背景: #
JHicx\8l 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。 :9H=D^J 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。 4$9WJ~V{ 图1. RPC Photonics工程漫射体结构及光束投射形状 z7'3d7r? fk-zT Fy^*@& 步骤 FC<aX[~&3 :3WrRT,'L 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Aat_5p u'cM}y& 图2. RPC Photonics工程漫射体不同类型的散射数据 cn (-{dCXM 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) P!yE{_% 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 `.Z MwA 例如下所示: 5{cbcuG Sample name: EDF-C1-56 >#).3 Merging data from file EDF-C1-56 0-0.txt )G6{JL-I Finished merging RPC data for sample EDF-C1-56 Dp|y&x! FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9:zW$Gt& 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 eqD|3YX a. 创建一个新的散射库 bL\ab b. 散射模型命名 :f (UZmV$ c. 改变散射模型为“Tabulated BSDF”. zr%2oFeX, 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 ) E
O^j,x g 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。 ~i 'Ib_%h 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, h-u63b1"? g. 点击OK BL1$~0 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 }$5S @, Lqy]bnY
B|E4(,]^ 脚本代码: c?oNKqPzg ) jBPt& '#Language "WWB-COM" ^eke,,~ ``?]13XjK Option Explicit ( 0/g)gW ~bU!4P}4j Sub Main @R%n & GUyMo@g 'Cleanup x*GGO)r
ClearOutputWindow() v|Y:'5`V kj_o I5<' Print "Merging RPC Photonics BSDF Data Files" "&(.Z ( SetTextColor(255,0,0) n$B SO Print "Note: Script should be located in the same folder as the BSDF TXT files." 5etbJk Print "Note: Do not run this script multiple times without deleting the output file between executions." Wt=QCutt SetTextColor(0,0,0) 2LS03 27 AA[(rw 'Current directory of this script (should be the same as the text files being merged) :D(4HXHK% Dim cDir As String 297X). cDir = MacroDir$ & "\" _7df(+.{<A @H%)!f]zWt 'Array which will be populated with the list of files to be merged E`68Z/% Dim fList() As String, curFile As String JL0>-kg GetFileList( cDir, fList ) c*LB=;npI A2 'W Print "" :u$nH9kwv Print "Files found for merging:" ph*9,\c8 For Each curFile In fList Ni]V)wGE; Print Chr(9) & curFile r(= Next R5PXX&Q B->3/dp2c' 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. [-}LEH1[p Dim nameArray() As String, sampName As String 0X6|pC~ nameArray = Split(fList(0)," 0-0.txt") D; xRgHn sampName = nameArray(0) <Uj~S Print "" =[]V$<G'w{ Print "Sample name: " & Chr(9) & sampName G Y? ?q8 UQZ<sp4v; 'Open an output file and write the FRED header data XL9smFq Dim outFile As String h"h3SD~ outFile = cDir & sampName & "_FRED.txt" (bpO>4(S Open outFile For Output As #1 _}8hEv Print #1, "type bsdf_data" 37C'knW Print #1, "format angles=deg bsdf=value scale=1" Wp7lDx }G8gk"st 'Loop the file list, skip the two header lines and write the remaining data to file nymF`0HYe1 Dim lineArray() As String, curLine As Long ?#N:
a For Each curFile In fList o<
)"\f/, Print "Merging data from file " & curFile S#km`N` ReadFile( cDir & curFile, lineArray ) p5RnFe l For curLine = 2 To UBound(lineArray) aU&p7y4C@ Print #1, lineArray(curLine) kD_Ac{{< Next ^y"
#2Ov Next SZVNu*G!H Ltv!;^Q5 'Close the output file OH.lAF4E( Close #1 IXjFK `^3 N|76Y Print "Finished merging RPC data for sample " & sampName r7dwj Print "FRED formatted data file: " & Chr(9) & outFile QT\||0V~p End Sub clhmpu n1yIQ8 F 'Utility function to read the contents of a file into an array of strings. {owXyQ2mK Function ReadFile(ByVal fileName As String, _ 2bu,_<K. ByRef lineArray() As String) As Long rV6&: \ kwI[BF ReadFile = -1 Z5x&P_.x[ Dim oFSO As Object @4)NxdOE Set oFSO = CreateObject("Scripting.FileSystemObject") g=G>4Ua3 Erase lineArray :V,agAMn /x2-$a:< Dim fid As Long IKaa=r~ If oFSO.fileexists( fileName ) Then SSr#MIS? fid = FreeFile() aM U0BS" Open fileName For Input As fid FX1[ 2\ lineArray = Split(Input(LOF(fid), fid), vbCrLf) _E\Cm Close fid <b
JF&, End If asEk3 Set oFSO = Nothing o]R*6$ Return UBound( lineArray ) ?nf !sJ'm 3@}rO~ End Function #BLx +mLq ww? AGd Sub GetFileList( ByVal in_dir As String, _ e4h9rF{Cxn ByRef in_flist() As String ) Py@/\V P/!W']OO 'Redimension the file list array ;!~&-I0l Erase in_flist G'#f*) f 0Dt-!Q7 'Tracks how many files are found _^%DfMP3i\ Dim fCount As Long OrC}WMhd fCount = 0 MpNgp)%>
R$|"eb5 'Recurse directory and search for text files ,1K`w:uhS Dim f As String &~Hx!]uc f = Dir$(in_dir & "*.txt") j^1Yz}6nR While f <> "" W1;QPdz: ReDim Preserve in_flist(fCount) @ajt
D-_2 in_flist(fCount) = f VY#nSF` fCount += 1
;2y4^ f = Dir$() V|3^H^\5P Wend .QvH7 ReDim Preserve in_flist(fCount-1) <q`'[1Y4
M*gbA5 End Sub JGHQzC
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