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摘要: `N'V#)Pi (%'9CfPx 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。 .3X Y&6 ]iVLHVqz 背景: '!Wvqs 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?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。 [E|uY]DR 图1. RPC Photonics工程漫射体结构及光束投射形状 tJ'iX>9I a
<wL#Id ?\y%]1 步骤 [_.n$p- 9]7u_ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 D(\$i.,b2 !%[S49s 图2. RPC Photonics工程漫射体不同类型的散射数据 gKi{Y1 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) i=rH7k 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 [Y/:@t"2y 例如下所示:
3+U]?7t Sample name: EDF-C1-56 #{PmNx%M Merging data from file EDF-C1-56 0-0.txt E!mmLVa9 Finished merging RPC data for sample EDF-C1-56 ej^3YNh& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q2QY* A 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Gu;OVLR| a. 创建一个新的散射库 7lA:)a_!] b. 散射模型命名 v~=\H c. 改变散射模型为“Tabulated BSDF”. r,NgG!zq< d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /.Q4~Hw%} e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 G%{0i20_ f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, D$q'FZH g. 点击OK ~ap2m 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 4 b,N8 93o;n1rS lr3mE 脚本代码: kbI/4IRW C5X(U: '#Language "WWB-COM" c$h9/H=~ @PSLs*
Option Explicit VW<0Lt3 \?lz&< Sub Main ^?GmrHC) 7o]HQ[ xO 'Cleanup 1cC1*c0Z ClearOutputWindow() z&}-8JykH ^%<pJMgdF Print "Merging RPC Photonics BSDF Data Files" {C3Y7< SetTextColor(255,0,0) g0R[xOS|
Print "Note: Script should be located in the same folder as the BSDF TXT files." 8dO?K*J,H' Print "Note: Do not run this script multiple times without deleting the output file between executions." m_7
nz!h SetTextColor(0,0,0) 3z8C o\=n4;S 'Current directory of this script (should be the same as the text files being merged) 5V5w:U>_z Dim cDir As String Zv!{{XO2; cDir = MacroDir$ & "\" *hY2.t; X h~}.G{" 'Array which will be populated with the list of files to be merged "484n/D Dim fList() As String, curFile As String N4!<Xj GetFileList( cDir, fList ) 7E7dSq l67Jl"v Print "" v ~)LO2y
Print "Files found for merging:" e2)autBe For Each curFile In fList !0}\&<8/m Print Chr(9) & curFile <48<86TP Next 0L-!!
c3 k$i'v:c|:i 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. l=m(mf?QBg Dim nameArray() As String, sampName As String MuI2?:~:*4 nameArray = Split(fList(0)," 0-0.txt") RHY4P4B<v> sampName = nameArray(0) xge7r3i Print "" SNpi=K!yn Print "Sample name: " & Chr(9) & sampName
8Ogv9 =;L*<I 'Open an output file and write the FRED header data kxB.,' Dim outFile As String 5Av=3[kh"% outFile = cDir & sampName & "_FRED.txt" BlC<`2S Open outFile For Output As #1 7jG(<!, Print #1, "type bsdf_data" |oFAGP1 Print #1, "format angles=deg bsdf=value scale=1" AC- )BM'; LHYLC>J 'Loop the file list, skip the two header lines and write the remaining data to file c-4STPNQi Dim lineArray() As String, curLine As Long 4=<*Vd`p For Each curFile In fList 3iNkoBCg Print "Merging data from file " & curFile Xyx"A(v^l ReadFile( cDir & curFile, lineArray ) l.=p8-/$'7 For curLine = 2 To UBound(lineArray) K\?]$dK5 Print #1, lineArray(curLine) A#y@`}]!' Next lCT{v@pp Next e":G*2a 8Cx^0 'Close the output file /n,a?Ft^N) Close #1 t0E 51Ic@ x!<yT?A Print "Finished merging RPC data for sample " & sampName zw@'vncc Print "FRED formatted data file: " & Chr(9) & outFile EG<s_d? End Sub @x&P9M0g X` YwP/D 'Utility function to read the contents of a file into an array of strings. 8{
c !). Function ReadFile(ByVal fileName As String, _ HL K@xKD< ByRef lineArray() As String) As Long Sm{>rR t#E}NR ReadFile = -1 fxQN+6; Dim oFSO As Object #
TkR Set oFSO = CreateObject("Scripting.FileSystemObject") A<MtKb
Erase lineArray Hf gz02Z$ tln37vq Dim fid As Long 2tQ`/!m>v$ If oFSO.fileexists( fileName ) Then Jf;?XP]z fid = FreeFile() R
W/z1 Open fileName For Input As fid <yUstz,Xu^ lineArray = Split(Input(LOF(fid), fid), vbCrLf) :$3oFN*g Close fid ~aK?cP End If [\z/Lbn
,. Set oFSO = Nothing e /K#>, Return UBound( lineArray ) 6QQfQ, 2'0K WYM End Function NZLAk~R;0 kSncZ0K{ Sub GetFileList( ByVal in_dir As String, _ R!\EKH ByRef in_flist() As String ) \_6OC Vil +>f<EPGn 'Redimension the file list array HfNDD|Zz Erase in_flist #\rwLpC1u f:JlZ& 'Tracks how many files are found /B3R1kNf| Dim fCount As Long \E1U@6a fCount = 0 je,}_:7 %q3$|> 'Recurse directory and search for text files +C]&2zc. Dim f As String Av J4\ f = Dir$(in_dir & "*.txt") r),PtI0X While f <> "" uq3{hB# ReDim Preserve in_flist(fCount) 7*o*6,/ in_flist(fCount) = f &]6)LFm fCount += 1 {}~: &.D f = Dir$() o89(
h! Wend tA.`k;LT ReDim Preserve in_flist(fCount-1) :*514N I<oL}f End Sub ~EiH-z4U 7j<e)" eU+ {*YJg QQ:2987619807 f>j wN@(
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