RPC Photonics扩散片BSDF
摘要: lW#2 ox o!+'<IQ' 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。 mk~CE .bp#YU,m 背景: )^qXjF 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。 _UkBOJ:G$H FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Y+23 jlgb
图1. RPC Photonics工程漫射体结构及光束投射形状 O!dS;p-F x@oxIXN v:74iB$i/C 步骤 sxF2ku4A [vb#W!M&| 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。 QwFA0 Kg<~Uf=1
图2. RPC Photonics工程漫射体不同类型的散射数据 >+i+_^] 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) Ei]SksV>* 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 V[WZ#u-p 例如下所示: CHqi5Z/+ Sample name: EDF-C1-56 z)*{bz] Merging data from file EDF-C1-56 0-0.txt ='kCY}dkO Finished merging RPC data for sample EDF-C1-56 n?OMfx FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt #Cs/.(< 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 M9Sj@ ww a. 创建一个新的散射库 *tpS6{4=#7 b. 散射模型命名 {y@8E>y5$ c. 改变散射模型为“Tabulated BSDF”. K`X'Hg#_P2 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 ) v?3xWXX, 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。 ea$. + f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线,
}8"i~>>a g. 点击OK GYf{~J 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 j<Pw0?~s6 QRl+7V q%A>q;l: 脚本代码: vzSjfv gxI/MD~!> '#Language "WWB-COM" ia
/#`#. G;/>
N'# Option Explicit M!gu`@@}F ?AxB0d9z Sub Main O<>+l*bk nHXPEbq-g 'Cleanup A
-8]4p:: ClearOutputWindow() }NV<k >N`,
3;Z Print "Merging RPC Photonics BSDF Data Files" FoYs<aER SetTextColor(255,0,0) 4V]xVma Print "Note: Script should be located in the same folder as the BSDF TXT files." Xooh00 Print "Note: Do not run this script multiple times without deleting the output file between executions." Eoo[H2=^H SetTextColor(0,0,0) ,_7m<(/f 5mudww` 'Current directory of this script (should be the same as the text files being merged) 0$yHO2 f Dim cDir As String zC[LcC*+J cDir = MacroDir$ & "\" $j(4FyH\ %Y|AXxR 'Array which will be populated with the list of files to be merged 91a);d Dim fList() As String, curFile As String TOqxl GetFileList( cDir, fList ) b=W kRj Zcc7
7dRA Print "" Bv*VNfUm Print "Files found for merging:" F$:mGyl5_ For Each curFile In fList MScUrW!TA Print Chr(9) & curFile \b)P4aL Next /@&uaw m^/>C-&C 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. U&$I!80. Dim nameArray() As String, sampName As String chuJj
IY nameArray = Split(fList(0)," 0-0.txt") \j
we sampName = nameArray(0) K6~')9Q Print "" EjEXev<] Print "Sample name: " & Chr(9) & sampName .rDao]K "4*QA0As 'Open an output file and write the FRED header data rg%m Dim outFile As String 4h}\Kl outFile = cDir & sampName & "_FRED.txt" h=NXU9n%' Open outFile For Output As #1 6,R<8a;Wn Print #1, "type bsdf_data" =7-kD3 Print #1, "format angles=deg bsdf=value scale=1" aH500 t3Iij0b~ 'Loop the file list, skip the two header lines and write the remaining data to file bX%4[BKP Dim lineArray() As String, curLine As Long k5)IBO For Each curFile In fList 3`"k1W Print "Merging data from file " & curFile k.Z?BNP ReadFile( cDir & curFile, lineArray ) Jx4~ o{Z}c For curLine = 2 To UBound(lineArray) ]HG>Og Print #1, lineArray(curLine) N71^ I"@HH Next 9<Th: t|w Next FQMA0"(G$ t$Ua&w 'Close the output file TjctK [db@ Close #1 `-rtU =G rg Print "Finished merging RPC data for sample " & sampName <2+FE/3L Print "FRED formatted data file: " & Chr(9) & outFile j8t_-sU9 i End Sub 7H[.o~\ &v r0{]V^ 'Utility function to read the contents of a file into an array of strings. \5)
ZI'q Function ReadFile(ByVal fileName As String, _ DEzL] 1;P ByRef lineArray() As String) As Long W5RZsS] q1%xk=8 ReadFile = -1 8O*O5 Dim oFSO As Object Pv8AWQQJ Set oFSO = CreateObject("Scripting.FileSystemObject") CT{X$N Erase lineArray .noY[P8i -]MZP:s Dim fid As Long +$GP(Uu, If oFSO.fileexists( fileName ) Then j0e1CSE fid = FreeFile() r*ry8QA
Open fileName For Input As fid 072`i46 lineArray = Split(Input(LOF(fid), fid), vbCrLf) mw=keY9] Close fid 7I6&*I End If !z?:Y#P3 Set oFSO = Nothing LoS%FI Return UBound( lineArray ) &) Iue<&2 ,<CzS,( End Function N8]d0 p:|p? Sub GetFileList( ByVal in_dir As String, _ (K>4^E8 ByRef in_flist() As String ) E`3[62C UrB{jS? 'Redimension the file list array 9t0NO-a Erase in_flist `"E<%$|ZQy %|?PG i@5 'Tracks how many files are found X57\sggK Dim fCount As Long J,wpY$93 fCount = 0 If. hA} Y3f2RdGl 'Recurse directory and search for text files y8O<_VOO}" Dim f As String ("@ih]zYf f = Dir$(in_dir & "*.txt") qr7_3 While f <> "" q^kOyA. ReDim Preserve in_flist(fCount) +t;j5\HS in_flist(fCount) = f U_Va'7 fCount += 1 ob>2SU[Y f = Dir$() ?bK^IHh Wend q \\52:\ ReDim Preserve in_flist(fCount-1) vC!}%sxVw_ rc]`PV End Sub OLxiY r
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