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D"ehWLj L%c0 Z@[~ 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;{emX h XNb ZNaAd 背景: GSQ/NYK 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。 gzD@cx?V 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。 V{&rQ@{W 图1. RPC Photonics工程漫射体结构及光束投射形状 qTo-pAG` N**g]T
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# 步骤 R$Tp8G>j 3y~r72J 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Iu*^xn MqA`yvQm 图2. RPC Photonics工程漫射体不同类型的散射数据 13&0rLS 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) gxMfu?zk" 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 dk<XzO~g 例如下所示: t/PlcV_M" Sample name: EDF-C1-56 \VFHHi:I Merging data from file EDF-C1-56 0-0.txt i^!ez5z Finished merging RPC data for sample EDF-C1-56 V$rlA'+1v FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt V@QK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 iTg; 7~1pY a. 创建一个新的散射库 ~E^,=4 b. 散射模型命名 {Pu\?Cq c. 改变散射模型为“Tabulated BSDF”. T'aec]u 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 ) k') E/n 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。 2',w[I
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, FsGlJ g. 点击OK EmT`YNuc 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 wB{;bB{ 1uk0d`JL a`u
S[r> 脚本代码: R1W}dRE} <JwX_\?ln '#Language "WWB-COM" @AYo-gf FHPXu59u Option Explicit ^Mk%z9
? J!*/a'Cv Sub Main =60~UM 5I@w~z 'Cleanup A[YpcG'9 ClearOutputWindow() ACK1@eF [|3>MZ2/ Print "Merging RPC Photonics BSDF Data Files" 45H!;Qsk SetTextColor(255,0,0) irZFV
Print "Note: Script should be located in the same folder as the BSDF TXT files." Px>va01n Print "Note: Do not run this script multiple times without deleting the output file between executions." pBC<u SetTextColor(0,0,0) h`}3h<
8 LN_OD5gZ 'Current directory of this script (should be the same as the text files being merged) 2w$twW- Dim cDir As String U`x bPQ cDir = MacroDir$ & "\" {3Vk p5%l *AIEl"29 'Array which will be populated with the list of files to be merged X{-9FDW Dim fList() As String, curFile As String T^} GetFileList( cDir, fList ) D8#
on! pNE(n4v Print "" N|2y"5 Print "Files found for merging:" 2`=6 %s
For Each curFile In fList j,2l8? Print Chr(9) & curFile '?yCq$& Next H2-28XGc S2VVv$r_6 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 41 vL"P
K Dim nameArray() As String, sampName As String ehAu^^Q> nameArray = Split(fList(0)," 0-0.txt") H_IGFZ Ch sampName = nameArray(0) s
Fgadz6O Print "" L {ymI)Y^ Print "Sample name: " & Chr(9) & sampName efuK Yp4c'Zk 'Open an output file and write the FRED header data 5H:@8,B Dim outFile As String n|4;Hn1V outFile = cDir & sampName & "_FRED.txt" p&K\]l} Open outFile For Output As #1 L6i|:D32p Print #1, "type bsdf_data" [&P`ak Print #1, "format angles=deg bsdf=value scale=1" >LF&EM] 7=*VpX1 'Loop the file list, skip the two header lines and write the remaining data to file 4rU!4l Dim lineArray() As String, curLine As Long kYxS~Kd< For Each curFile In fList O:.,+,BH Print "Merging data from file " & curFile WO,xMfK ReadFile( cDir & curFile, lineArray ) y02u?wJ For curLine = 2 To UBound(lineArray) ! ]Mc4!E Print #1, lineArray(curLine) swpnuuC- Next >AI<60/< Next xnq><4 g3?U#7i 'Close the output file `HX3|w6W; Close #1 Vul+]h[!h C/v}^#cLD Print "Finished merging RPC data for sample " & sampName [B?z1z8l Print "FRED formatted data file: " & Chr(9) & outFile i!MwBYk End Sub P?3{z="LzJ (3EUy"z- 'Utility function to read the contents of a file into an array of strings. y>(rZ^y& Function ReadFile(ByVal fileName As String, _ uf@U:V ByRef lineArray() As String) As Long =V^@%YIn zb2K;%Qs+f ReadFile = -1 f(u&XuZ Dim oFSO As Object En9R>A;` Set oFSO = CreateObject("Scripting.FileSystemObject") amB@N6* Erase lineArray }BN\/;<A _q Tpy)+ Dim fid As Long {&nV4c$v If oFSO.fileexists( fileName ) Then < `Z%O<X fid = FreeFile() te2
Iu%5 z Open fileName For Input As fid ~/`X*n& lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4-:7.I(hq Close fid C;sgK End If =wA5P@ Set oFSO = Nothing B2hfD-h,> Return UBound( lineArray ) T#iU+)-\% >x'bZ]gm End Function b4~H3| .u< U:* Sub GetFileList( ByVal in_dir As String, _ p~bkf> ByRef in_flist() As String ) i;lE5 *:arva5 'Redimension the file list array $au2%NL Erase in_flist XN;/nU NdQ%:OKC 'Tracks how many files are found
kQ }s/* Dim fCount As Long [(cL/_ fCount = 0 iUNnPJh 5L&:_iQZy 'Recurse directory and search for text files Mj~${vj Dim f As String [$2qna2VP f = Dir$(in_dir & "*.txt") SLA#= K While f <> "" `$9L^Yg,4 ReDim Preserve in_flist(fCount) HtzMDGV< in_flist(fCount) = f #K`B<2+T fCount += 1 !Y%D
9 f = Dir$() zPQ$\$7xB Wend A1<k1[5fJ ReDim Preserve in_flist(fCount-1) h[l{ 5Z* f8!l7{2%q End Sub R ]=SWE}U J<_ 1z':W) b]dxlj}
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