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摘要: ,|?#+O{ ;O~FiA~`c 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。 Z[Iej:o5 aL;zN%Tw 背景: 5&L*'kV@ 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。 U
Rq9:{ 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。 1>OU~A" 图1. RPC Photonics工程漫射体结构及光束投射形状 .8ikcs ]c'EJu
vmOye/?k 步骤 \SwqBw B>d49(jy 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。 jw\4`NZ] .}+3A~ 图2. RPC Photonics工程漫射体不同类型的散射数据 /4+zT?f 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) u6Ux nqNc 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 \}=W*xxB 例如下所示: ^e =xEZD Sample name: EDF-C1-56 iGj,B =35 Merging data from file EDF-C1-56 0-0.txt 1g,gilc Finished merging RPC data for sample EDF-C1-56 QFhyidm=] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt @ra JB' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~mah.8G
a. 创建一个新的散射库 {(F}SF{ b. 散射模型命名 5RO6YxQ c. 改变散射模型为“Tabulated BSDF”. .9g :-hv 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 ) @{3_7 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。 &pz`gna 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, <.BY=z=H g. 点击OK \ E5kpm 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 {LqYb:/C5U 4PU@W o &n83>Q 脚本代码: !&@t 1{cF/ :o '#Language "WWB-COM" w+!V,lU"^ Ly
v"2P Option Explicit UN;U+5,t \fUVWXv Sub Main hmb=_W km
lb,P 'Cleanup r<P? F ClearOutputWindow() l#+@!2z vt(n: Xk Print "Merging RPC Photonics BSDF Data Files" o?.VW/" SetTextColor(255,0,0) i{Q,>Rt Print "Note: Script should be located in the same folder as the BSDF TXT files." +Bt%W%_X Print "Note: Do not run this script multiple times without deleting the output file between executions." \sW>Y#9] SetTextColor(0,0,0) J]48th0, ~G^+.>j 'Current directory of this script (should be the same as the text files being merged) d=\\ik8 Dim cDir As String s6 K~I cDir = MacroDir$ & "\" )B~{G\jS d]E.F64{ 'Array which will be populated with the list of files to be merged S|yDGT1 Dim fList() As String, curFile As String wb]Z4/j# GetFileList( cDir, fList ) NcSi %] 6Ol)SQE, Print "" %5Elj<eHZ Print "Files found for merging:" $Nj'_G\} For Each curFile In fList =1O;,8` Print Chr(9) & curFile +tYskx/ Next Di$++T8" 4Xv."L 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. sN1I+X Dim nameArray() As String, sampName As String #.OCoc nameArray = Split(fList(0)," 0-0.txt") "*d%el\63 sampName = nameArray(0) &&96kg3 Print "" jgYe\dinM Print "Sample name: " & Chr(9) & sampName 7~D5Gy #_Lgo
'Open an output file and write the FRED header data k)9
pkPl Dim outFile As String @_;vE(!5 outFile = cDir & sampName & "_FRED.txt" i^}DIx{ Open outFile For Output As #1 +6<g N[ Print #1, "type bsdf_data" #'y^@90R Print #1, "format angles=deg bsdf=value scale=1" >lO]/3j1 UX?S#:h 'Loop the file list, skip the two header lines and write the remaining data to file *}ZKQ Dim lineArray() As String, curLine As Long yfAh= For Each curFile In fList 6a{b%e` Print "Merging data from file " & curFile 0IbR>zFg. ReadFile( cDir & curFile, lineArray ) 6bbzgULl For curLine = 2 To UBound(lineArray) p,OB;Ncf/ Print #1, lineArray(curLine) P"+K'B7K3 Next $n<X'7@0 Next `u;4Z2Lr0 zids2/_* 'Close the output file FK,YVY Close #1 r5!Sps3B =G1
5eZW Print "Finished merging RPC data for sample " & sampName %h=cwT6 Print "FRED formatted data file: " & Chr(9) & outFile nrz2f7d$ End Sub sYyya:ykxT >=L<3W1 'Utility function to read the contents of a file into an array of strings. H3BMN}K~ Function ReadFile(ByVal fileName As String, _ "nn>I}jK ByRef lineArray() As String) As Long 7{u1ynt |%Ssb;M ReadFile = -1 D{,
b|4 Dim oFSO As Object /2]=.bLwz Set oFSO = CreateObject("Scripting.FileSystemObject") X&|y| Erase lineArray V#d8fRm { Em fw9L Dim fid As Long 2?9gf,U If oFSO.fileexists( fileName ) Then 2E=vMAS fid = FreeFile() f`,isy[ Open fileName For Input As fid 1n+JHXR\ lineArray = Split(Input(LOF(fid), fid), vbCrLf) "@+r|x Close fid P&8QKX3
j^ End If c_.4~>qw Set oFSO = Nothing |gJI}"T Return UBound( lineArray ) !"
7ip9a |),3`*N End Function Qj/.x#T `1U?^9Nf Sub GetFileList( ByVal in_dir As String, _ )|i]"8I ByRef in_flist() As String ) pksF|VS W*NK-F[ 'Redimension the file list array 5R"(4a P Erase in_flist gye'_AR?k |H@1g=q 'Tracks how many files are found -JB~yO?0 Dim fCount As Long @m(ja@YC fCount = 0 %oN5 jt !TdbD56 'Recurse directory and search for text files xO` O$ie Dim f As String {qjw
S1v f = Dir$(in_dir & "*.txt") A@k`$xevVj While f <> "" J+20]jI ReDim Preserve in_flist(fCount) CLX!qw]@ + in_flist(fCount) = f dd@-9?6M fCount += 1 ~xP4}gs1 f = Dir$() C%\. Wend Wk&g!FR ReDim Preserve in_flist(fCount-1) *1clPK Dwp-*QK^G End Sub n{v[mqm^
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