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摘要: ^p3W}D WF<3
7"A@ 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。 ^95njE`>t` eU8p;ajW!L 背景: P+DIo7VTX 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。 t$rla_rbY FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 o_03Io
~Bf 图1. RPC Photonics工程漫射体结构及光束投射形状 /|isRh| M[(pLYq: S:1g(f*85 步骤 #@F.wV0 0B:
v0R 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 eg24.W9c Gr#WD=I-} 图2. RPC Photonics工程漫射体不同类型的散射数据 pj7v{H + 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) BlqISyrY 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 gj
I>tz} 例如下所示: ;*0?C'h= Sample name: EDF-C1-56 }
| Merging data from file EDF-C1-56 0-0.txt oXUb_/ Finished merging RPC data for sample EDF-C1-56 U*?`tdXJ$ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6"R'z#{OF 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 fElFyOo+ a. 创建一个新的散射库 YLuf2ja}X b. 散射模型命名 9*r^1PRc c. 改变散射模型为“Tabulated BSDF”. gU1Pb]] 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 ) kT:I.,N 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。 !;0K=~(Y^ 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, x_r*<?OZ g. 点击OK D"%> 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [2E(3`-u n#@ Qd!uzM mhB2l/ 脚本代码: QWtDZ> ^b.#4i(v '#Language "WWB-COM" 2f620 iu3L9UfL[ Option Explicit dFyGI? \`E^>6!]q Sub Main 4u+0 )< :Qhrh(i 'Cleanup hCS} ClearOutputWindow() qG ? :Q B{*{9!(l9 Print "Merging RPC Photonics BSDF Data Files" *"OUwEl a SetTextColor(255,0,0) !F.h+&^D; Print "Note: Script should be located in the same folder as the BSDF TXT files." !-%XrU8o3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 2_y]MXG+% SetTextColor(0,0,0)
I Zw hS&l4 \I'Z 'Current directory of this script (should be the same as the text files being merged) "%\hDL; Dim cDir As String P-3f51 Q cDir = MacroDir$ & "\" Rc
&m4|cw7 RB|i<`Z 'Array which will be populated with the list of files to be merged UtP|<]{ Dim fList() As String, curFile As String FSn3p}FVa GetFileList( cDir, fList ) H2+b3y-1a] *0to,$ n Print "" E&eY79 Print "Files found for merging:" om2N*W.gk For Each curFile In fList Y~e)3e Print Chr(9) & curFile Q$v00z]f* Next _TGs .t /R&h#;l 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ~$J(it-a Dim nameArray() As String, sampName As String 5doi4b>]! nameArray = Split(fList(0)," 0-0.txt") .Z
67 sampName = nameArray(0) "r*`*1 Print "" F"UI=7:o Print "Sample name: " & Chr(9) & sampName 9@yF7 JWI Y0iP 'Open an output file and write the FRED header data
-0x Q'1I Dim outFile As String DA.k8M outFile = cDir & sampName & "_FRED.txt" +{RTz)e?* Open outFile For Output As #1 tH44\~ Print #1, "type bsdf_data" w"wW0uE^ Print #1, "format angles=deg bsdf=value scale=1" &9fQW?Czs mO;QT 'Loop the file list, skip the two header lines and write the remaining data to file [
'lu;1-, Dim lineArray() As String, curLine As Long 5af0- hj For Each curFile In fList d?T!)w Print "Merging data from file " & curFile xcU!bDV ReadFile( cDir & curFile, lineArray ) &i(Ip'r For curLine = 2 To UBound(lineArray) YrB-n Print #1, lineArray(curLine) | @$I< Next C5 Q!_x( Next )c{>@WM~ )Wr_*>xj 'Close the output file D2kmBZ3 Close #1 ?VmgM"'md mXOI"B9Sq Print "Finished merging RPC data for sample " & sampName (8)9S6 Print "FRED formatted data file: " & Chr(9) & outFile |w}j!}u End Sub ]LUcOR @,TIw[p 'Utility function to read the contents of a file into an array of strings. XhHgXVVGG< Function ReadFile(ByVal fileName As String, _ k#Sr; " ByRef lineArray() As String) As Long C| ~A]wc= _ERtL5^ ReadFile = -1 ypx~WXFK Dim oFSO As Object ,MNv}w@ Set oFSO = CreateObject("Scripting.FileSystemObject") zMFTkDY Erase lineArray E|"SMA, =g9n =spAn Dim fid As Long +w^,!gA& If oFSO.fileexists( fileName ) Then g"1V] fid = FreeFile() G?'^"ae"Z Open fileName For Input As fid 0Eb4wupo lineArray = Split(Input(LOF(fid), fid), vbCrLf) A}(]J!rc Close fid 6dR+qJa6i End If *k62Qz3 Set oFSO = Nothing 2c 0;P
#ol Return UBound( lineArray ) B[GC@]HE Q_0+N3 End Function Wvf>5g)? ~3?-l/ $ Sub GetFileList( ByVal in_dir As String, _ Zek@xr;] ByRef in_flist() As String ) /)sP, 2/ *v+l,z4n 'Redimension the file list array N7_eLhPt*8 Erase in_flist $qQYxx@ ES&u*X: 'Tracks how many files are found 1"ZtE\{
" Dim fCount As Long 6+IhI?lI= fCount = 0 id1cZig OR+qi*) 'Recurse directory and search for text files TjTG+uQ Dim f As String m7'<k1#"Y f = Dir$(in_dir & "*.txt") i"0Bc{cQ While f <> "" s Z[[ymu8 ReDim Preserve in_flist(fCount) ~{/M_
= in_flist(fCount) = f n?EgC8b9 fCount += 1 ~~OFymQ%?q f = Dir$() q5SPyfE[ Wend 4@ ReDim Preserve in_flist(fCount-1) '6dVe2V o:AfEoH"~ End Sub \N*([{X
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