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摘要: 9x8Vsd xsy45az<ip 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。 u
i$4 O(e!Vx{t! 背景: @[f$MRp\ 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。 Lp4F1H2t- 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。 q"S,<I<f 图1. RPC Photonics工程漫射体结构及光束投射形状 p=kt+H&; {9Ok^O knpdECq&k 步骤 BnDCK@+|Q 6V@_?a-K 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。 F!4V!VWA} hd(TKFL^y 图2. RPC Photonics工程漫射体不同类型的散射数据 ?4aW^l6/ 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) 4gVIuF*pS 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 e"{"g[b/7 例如下所示: \I<R.49oW Sample name: EDF-C1-56 6R$Yh0% Merging data from file EDF-C1-56 0-0.txt 28c6~*Te# Finished merging RPC data for sample EDF-C1-56 gh
:5 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt rKT.~ZP\ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 myqwU`s a. 创建一个新的散射库 D:z_FNN b. 散射模型命名 ]|=`-)AP3 c. 改变散射模型为“Tabulated BSDF”. ty4R2LnC d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) @t*D<B$ 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。 5~im.XfiVx 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, gSj0+| g. 点击OK &@BAVc z 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 EwuRIe;D
ylS6D Q"c/]Sk) 脚本代码: ]:'] x
ju*zmu '#Language "WWB-COM" M&gi$Qs[E z}Us+>z+jc Option Explicit gN73)uJ0 P|p
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F~ Sub Main MA}}w& i3d2+N` 'Cleanup :O,r3O6 ClearOutputWindow() 6X?:mn'%QF G)M! ,
Q Print "Merging RPC Photonics BSDF Data Files" >ke.ZZV? SetTextColor(255,0,0) ]sE)-8 Print "Note: Script should be located in the same folder as the BSDF TXT files." i:jB Print "Note: Do not run this script multiple times without deleting the output file between executions." FUJ<gqL SetTextColor(0,0,0) [F;\NJp6?^ "M\rO!f: 'Current directory of this script (should be the same as the text files being merged) F#RN m5 Dim cDir As String W,H=K##6< cDir = MacroDir$ & "\" u?g&(h t.VVE:A^% 'Array which will be populated with the list of files to be merged :PY6J}: Dim fList() As String, curFile As String ?,+&NX3m GetFileList( cDir, fList ) so/0f1R?~ =n_z `I Print "" +xsGa{` Print "Files found for merging:" UIg?3J}R For Each curFile In fList ~-uf%= Print Chr(9) & curFile c#1kg@q@ Next 11Qi
_T\ F?6Q(mRl 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Q-#<{' ( Dim nameArray() As String, sampName As String ;*9<lUvu nameArray = Split(fList(0)," 0-0.txt") J7aYi]vI sampName = nameArray(0) 5JK'2J& Print "" #Ufb Print "Sample name: " & Chr(9) & sampName 9^`cVjD5 {D :WXvI 'Open an output file and write the FRED header data kdx06'4o Dim outFile As String `kv7Rr}Q outFile = cDir & sampName & "_FRED.txt" l{ql'm Open outFile For Output As #1 05\0g9 Print #1, "type bsdf_data" }u$c*} Print #1, "format angles=deg bsdf=value scale=1" i+< v7?:`# rnp; R 'Loop the file list, skip the two header lines and write the remaining data to file [e@m-/B Dim lineArray() As String, curLine As Long A{k1MA<F6 For Each curFile In fList 8;c\}D Print "Merging data from file " & curFile O@W/s!&lFa ReadFile( cDir & curFile, lineArray ) 6#K.n&=* For curLine = 2 To UBound(lineArray) P>)J:.tr0 Print #1, lineArray(curLine) VAUd^6Xdwx Next &2[Xu4* Next #R31VQwK5 T /IX(b'< 'Close the output file 2EN}"Du]mj Close #1 9(}d7y 2@pEiq3 Print "Finished merging RPC data for sample " & sampName 9IrCu?n9b Print "FRED formatted data file: " & Chr(9) & outFile gzH;`, End Sub FwHqID_!:l ;mz#$"( 'Utility function to read the contents of a file into an array of strings. hNkv lk'Ui Function ReadFile(ByVal fileName As String, _ J kAd3ls ByRef lineArray() As String) As Long '@w'(}3!3R 3
Fy CD4# ReadFile = -1 <RbfW'<G Dim oFSO As Object tlg}"lY Set oFSO = CreateObject("Scripting.FileSystemObject") nhC8Tq[m Erase lineArray MZcvr 9y ydY 7 :D Dim fid As Long t0v>J9 If oFSO.fileexists( fileName ) Then #Dz"g_d fid = FreeFile() tl7:L> Open fileName For Input As fid _h,_HW)G lineArray = Split(Input(LOF(fid), fid), vbCrLf) x%goyXK Close fid %hZX XpuO End If vdB2T2F Set oFSO = Nothing (JnEso-V Return UBound( lineArray ) }Y!s:w# .m>Qlh
End Function *icaKy3 _5(p=Zc Sub GetFileList( ByVal in_dir As String, _ h"Wpb}FT ByRef in_flist() As String ) `'3 De( 5WxNH}{ 'Redimension the file list array w2/3[VZ}l Erase in_flist fO^s4gWTg /38I(0 'Tracks how many files are found be]/ROP>H Dim fCount As Long ~]?EV?T fCount = 0 vkR~nIp On!+7is' 'Recurse directory and search for text files ,WnZ^R/n Dim f As String fl9VokAT f = Dir$(in_dir & "*.txt") upZc~k!1\ While f <> "" D8PC;@m
ReDim Preserve in_flist(fCount) Bj><0
cNF in_flist(fCount) = f O\Z!7UQ$ fCount += 1 ; !t?* f = Dir$()
&0|Z FXPd Wend P_8!Gp ReDim Preserve in_flist(fCount-1) #DJZ42 O:T
49:R}r End Sub Z,O-P9jC
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