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摘要: b{]z
wpf ~XWQhIAM4 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。 Ct=-4 fDvl/|62{ 背景: p|&Yku= 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 &(|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。 }7
c[Q($K 图1. RPC Photonics工程漫射体结构及光束投射形状 hnc@ 8F&=a,ps[ ;bLEL"x% 步骤 !`M|C?b
?l^1 *Q, 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。 HLZ;8/|48m aW`Lec{. 图2. RPC Photonics工程漫射体不同类型的散射数据 Ooq! 0g 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) .b6VQCS~9 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 6Qy@UfB 例如下所示: h?;T7|^ Sample name: EDF-C1-56 >w^YO25q Merging data from file EDF-C1-56 0-0.txt @>)r}b Finished merging RPC data for sample EDF-C1-56 vWf;
'j FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt KNLfp1! 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ek}a}.3 { a. 创建一个新的散射库 U}PiY"S< b. 散射模型命名 Vy938qX c. 改变散射模型为“Tabulated BSDF”. )Hk3A$6( d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) OSf}Q=BL e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q&eQQ6b^Ih f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ~ y;6W0x g. 点击OK W>p-u6u%E| 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @Q/-s9b (C@~3!AVa .On|uC)! 脚本代码: Lg*B>= pD01,5/ '#Language "WWB-COM" naw0$kXTA bdibaN-h Option Explicit
S4h:|jLUF 4W)B'+ZK8 Sub Main x>* Drm 7 E7Y`|nT 'Cleanup s+EAB{w$ ClearOutputWindow() /i-J&*6_ QiLEL Print "Merging RPC Photonics BSDF Data Files" - qy6Un+ SetTextColor(255,0,0) g47-db"5 Print "Note: Script should be located in the same folder as the BSDF TXT files." -!N&OZ+R
Print "Note: Do not run this script multiple times without deleting the output file between executions." nx^]>w SetTextColor(0,0,0) 3rcKzS7 .G)(0z("s 'Current directory of this script (should be the same as the text files being merged) <B6&I$Wc+ Dim cDir As String JA'h4AXk cDir = MacroDir$ & "\" 0;:.B
j V8HnUuz 'Array which will be populated with the list of files to be merged [-;_ZFS{ Dim fList() As String, curFile As String <p\6AnkMr GetFileList( cDir, fList ) 0VGPEKRh '
)?f{ Print "" .Jrqm Print "Files found for merging:" #P?6@\ For Each curFile In fList , 'ZD=4_ Print Chr(9) & curFile G_k~X" Next o(r\E0I {6c2{@ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. pm\x~3jHs Dim nameArray() As String, sampName As String LK, bO| nameArray = Split(fList(0)," 0-0.txt") .$%Soyr?, sampName = nameArray(0) CFqJ/'' Print "" k?z98 >4 Print "Sample name: " & Chr(9) & sampName K!'AkTW+- &b?LP] 'Open an output file and write the FRED header data Zuw?58RE\ Dim outFile As String bD[!/'4eJ outFile = cDir & sampName & "_FRED.txt" <X7FMNr[ Open outFile For Output As #1 ;M_o)OS3 Print #1, "type bsdf_data" #L{OV)a< Print #1, "format angles=deg bsdf=value scale=1" ?I[8' &znQ;NH# 'Loop the file list, skip the two header lines and write the remaining data to file e=Z,
Jg Dim lineArray() As String, curLine As Long kRTwaNDOD For Each curFile In fList Ircp``g Print "Merging data from file " & curFile oA =4=` ReadFile( cDir & curFile, lineArray ) &Ibu>di4[ For curLine = 2 To UBound(lineArray) mN>h5G>a Print #1, lineArray(curLine) =ZDAeVz3w Next PB/IFsJ Next <oWB0% +H9 >A0JF 'Close the output file VGceD$< Close #1 -GqT7`:(H4 BVr0Gk Print "Finished merging RPC data for sample " & sampName dd\n8f Print "FRED formatted data file: " & Chr(9) & outFile BwBm[jtP End Sub VA9Gb9 <%Ostqj 'Utility function to read the contents of a file into an array of strings. H'LD}\K l Function ReadFile(ByVal fileName As String, _ r; xLP ByRef lineArray() As String) As Long ` bdZ/*E Q<KvBgmT ReadFile = -1 PC[c/CoD Dim oFSO As Object +\|Iu;w Set oFSO = CreateObject("Scripting.FileSystemObject") 2A\,-*pc Erase lineArray e][B7wZ `X`2:@gQ Dim fid As Long baP^<w^ If oFSO.fileexists( fileName ) Then ]6{*^4kX fid = FreeFile() ,daKC Open fileName For Input As fid |{@8m9JR lineArray = Split(Input(LOF(fid), fid), vbCrLf) uFLx Close fid FI<q@HF End If g =2Rqi5 Set oFSO = Nothing +{/*z Return UBound( lineArray ) sp
]zbX? K,e w >U End Function S=nP[s \N4
y< Sub GetFileList( ByVal in_dir As String, _ v k?skN@ ByRef in_flist() As String ) 4lM8\Lr j8n4fv-)f 'Redimension the file list array gCN$} Erase in_flist |<Gl91 G
<uyin> 'Tracks how many files are found hTEx]# ( Dim fCount As Long jU3Z*Z)zN fCount = 0 l%`F&8K ?qX)ihe%k 'Recurse directory and search for text files vi|R(& Dim f As String r)1'ePI" f = Dir$(in_dir & "*.txt") %uoQ9lD' While f <> "" h[?O+Z^ ReDim Preserve in_flist(fCount) OKP9CLg9
in_flist(fCount) = f VL/|tL>E^ fCount += 1 =e}H'5?! f = Dir$() gi-Yqco Wend E^rbcGJ ReDim Preserve in_flist(fCount-1) sj8~?O R-RDT9&< End Sub d)[;e() H> '>3]G 9XHz-+bQ QQ:2987619807 $F/EJ>
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