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摘要: 5C/W_H+9iK zCT Wi 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。 D[m;rcl >&tPIrz 背景: 7=t4;8|j; 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。 GFOd9=[ 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。 [Z|R-{" 图1. RPC Photonics工程漫射体结构及光束投射形状 gvO}u 2.: U[=VW0 c4oQ4 步骤 Q0'xn }3F8[Td.~N 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。 jpZ, $ &,2h=H,M 图2. RPC Photonics工程漫射体不同类型的散射数据 ps"DL4* 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) ./LD 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 |ul25/B
B 例如下所示: pw*<tXH! Sample name: EDF-C1-56 TU{^/-l Merging data from file EDF-C1-56 0-0.txt LFob1HH*8 Finished merging RPC data for sample EDF-C1-56 n1`D:XrE FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt k DS 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 hm >JBc:n- a. 创建一个新的散射库 Z 9mY*}:U~ b. 散射模型命名 eKNZ?!c= c. 改变散射模型为“Tabulated BSDF”. .{x-A{l 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 ) 7udMF3;> 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。 y|U3 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, 9(DS"fgC g. 点击OK I.TdYSB 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 EV|
6._Z(D $Zp\^cIE+ Enn7p9& 脚本代码: e5_a.c ~~k_A|& '#Language "WWB-COM" DVt;I$ 6U6,Wu Option Explicit $^?"/;8P5 %N_5p'W Sub Main }z1aKa9 6lOT5C eJ" 'Cleanup 0P^RciC f ClearOutputWindow() xGTVC=q .)o<'u@Ri Print "Merging RPC Photonics BSDF Data Files" ED&>~~k) SetTextColor(255,0,0) *n dXZ64 Print "Note: Script should be located in the same folder as the BSDF TXT files." S/)P&V% Print "Note: Do not run this script multiple times without deleting the output file between executions." Hj't.lg+j SetTextColor(0,0,0) p9Zi}!
)WavG1 'Current directory of this script (should be the same as the text files being merged) p'fq&a+ Dim cDir As String `"zXf -qeE cDir = MacroDir$ & "\" +<7~yZ[Z8 yEIM58l 'Array which will be populated with the list of files to be merged T Z{';oU Dim fList() As String, curFile As String e/JbRbZX GetFileList( cDir, fList ) B-PN +P2 ;`',M6g Print "" r18euB% Print "Files found for merging:" V/"UDof For Each curFile In fList 68JYA? Print Chr(9) & curFile esU9 Next @dei}!e m/uBM6SXx 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. NovF?kh2 Dim nameArray() As String, sampName As String ,Bax0p nameArray = Split(fList(0)," 0-0.txt") P}hHx<L sampName = nameArray(0) LdnHz# Print "" QG
{KEj2V Print "Sample name: " & Chr(9) & sampName #&<>|m '4k
l$I 'Open an output file and write the FRED header data #v+2W Dim outFile As String l =~EweuM outFile = cDir & sampName & "_FRED.txt" Vc0C@*fVM Open outFile For Output As #1 "j-Z<F]] Print #1, "type bsdf_data" F!.Z@y P Print #1, "format angles=deg bsdf=value scale=1" y,'M3GGl +*&bgGhT 'Loop the file list, skip the two header lines and write the remaining data to file Z$
q{!aY Dim lineArray() As String, curLine As Long h=h4`uA9 For Each curFile In fList [w*YH5kX Print "Merging data from file " & curFile mU@pRjq= ReadFile( cDir & curFile, lineArray ) _wMx KM For curLine = 2 To UBound(lineArray) A)6xEeyR Print #1, lineArray(curLine) :Z)a&A9v Next %;ST7 Next ;PM(q<@\ !YX$4_I 'Close the output file
mY6d+ Close #1 "LZQ1P*ef$ Ai>=n; Print "Finished merging RPC data for sample " & sampName \cJ?2^Eq Print "FRED formatted data file: " & Chr(9) & outFile #o`y<1rN End Sub V$wW?+V pY@$N&+W 'Utility function to read the contents of a file into an array of strings. IBfLb(I Function ReadFile(ByVal fileName As String, _ 8i$quHd&x ByRef lineArray() As String) As Long *i LlBE VPOzt7: ReadFile = -1 u}_,4J
Dim oFSO As Object /`6Y-8e2 Set oFSO = CreateObject("Scripting.FileSystemObject") 2IMU & Erase lineArray s'$5]9$S Vx'82CIC Dim fid As Long 'k^d-Mh>h If oFSO.fileexists( fileName ) Then S7oPdzcU- fid = FreeFile() _{Z!$q6, Open fileName For Input As fid Y=G9|7*lO lineArray = Split(Input(LOF(fid), fid), vbCrLf) \e)>]C}h Close fid rK` x< End If v9*ugu[K9 Set oFSO = Nothing `G/%U~ Return UBound( lineArray ) BQW hTS7 CG#lpAs End Function AS1#_fC M~/Pk7CC Sub GetFileList( ByVal in_dir As String, _ Z%&$_-yJ ByRef in_flist() As String ) |:7
^ K Eda6zZH 'Redimension the file list array nR%ey" Erase in_flist |ty?Ah,vb :zA/~/Wo 'Tracks how many files are found L
i g7Ac, Dim fCount As Long 5r2A^<) fCount = 0 y
J|/^qs L<D<3g|4 'Recurse directory and search for text files
pVm]<jO Dim f As String `GDWy^-Q+! f = Dir$(in_dir & "*.txt") 1>yh`Bp\= While f <> "" EKgY ReDim Preserve in_flist(fCount) jmORKX+) in_flist(fCount) = f fk*I}pDx fCount += 1 Yamu"# f = Dir$() ~`Y!_ '(x Wend eW<|I ReDim Preserve in_flist(fCount-1) 6
4,('+ !l(D0 C End Sub F>F2Yql&W
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