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摘要: uTvf[%EHW Kh{_BdN 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。 #r QT)n ~h$
H@&5 背景: 2XyC;RWJ% 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。
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YjU" 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。 g ,yB^^% 图1. RPC Photonics工程漫射体结构及光束投射形状 >nO[5 j43i:c;F Tsocc5gWZ* 步骤 zC`ediyu ,{d=<j_ 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。 G%U!$\j:qd j-v/;7s/B 图2. RPC Photonics工程漫射体不同类型的散射数据 2{S*$K[M 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) 5")BCA 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 wsgT`M'J[ 例如下所示: 'y7<!uo? Sample name: EDF-C1-56 99~ZZG Merging data from file EDF-C1-56 0-0.txt @%!Gj{ Finished merging RPC data for sample EDF-C1-56 3935cxT1U FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt P_(<?0l 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2[Xe:)d a. 创建一个新的散射库 o<rbC <
U b. 散射模型命名 =z'533C c. 改变散射模型为“Tabulated BSDF”. 4F+G;'JV 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 ) 1-Q>[Uz, 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。 1-PFM- 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, ;Bat--K7+ g. 点击OK M1I4Ot 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 !X 0 (4^ j6Au<P (, $Lp0mB7 脚本代码: w[J.?v&^ 7eG@)5Uy '#Language "WWB-COM" Tvw(Sq}; *oAnG:J+M Option Explicit ._<gc;G XQcE
ZJ2 Sub Main soqnr"
1 RY*yj&?w[ 'Cleanup 10*^ ClearOutputWindow() hroRDD sNJ?Z"5k1h Print "Merging RPC Photonics BSDF Data Files" Jo9c|\4 SetTextColor(255,0,0) d{DBG}/Yg Print "Note: Script should be located in the same folder as the BSDF TXT files." .&/A!3pW Print "Note: Do not run this script multiple times without deleting the output file between executions." u HXb=U SetTextColor(0,0,0) Co`:D kv`5"pa7M 'Current directory of this script (should be the same as the text files being merged) vr$z6m ^ Dim cDir As String |2&|#K4k^ cDir = MacroDir$ & "\" g$mqAz< qGgdWDn` 'Array which will be populated with the list of files to be merged 2Oy-jM Dim fList() As String, curFile As String \?AA:U* GetFileList( cDir, fList ) )==Qo/N : tfjb G;R Print "" !DeU8.% Print "Files found for merging:" /!-ypIY
For Each curFile In fList nG"Ae8r Print Chr(9) & curFile QM'>)!8 Next s$VLVT*6
E5$uvxCI 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. LdyE*u_ Dim nameArray() As String, sampName As String IE&G7\>(yO nameArray = Split(fList(0)," 0-0.txt") _2WIi/6K sampName = nameArray(0) T4}q%%7l Print "" BF]+fs` Print "Sample name: " & Chr(9) & sampName [?#-JIZ3T iD2>-yf 'Open an output file and write the FRED header data vo2 T P: Dim outFile As String #^q@ra outFile = cDir & sampName & "_FRED.txt" >{juw&Uu Open outFile For Output As #1 ]j<&
:_ Print #1, "type bsdf_data" \K(#
r= Print #1, "format angles=deg bsdf=value scale=1" 5va ;Ol4 ]yA_N>k2K 'Loop the file list, skip the two header lines and write the remaining data to file .?.Q[ic Dim lineArray() As String, curLine As Long U&y?3 For Each curFile In fList HO;,Ya^l Print "Merging data from file " & curFile i%9xt1c_ ReadFile( cDir & curFile, lineArray ) ~
*P9_< For curLine = 2 To UBound(lineArray) cin3)lm Print #1, lineArray(curLine) +K[H!fD Next tNCKL.yU Next ;,:w%. ;EfREfk
'Close the output file P3V}cGZ Close #1 r$-]NYPi {NV=k%MTmi Print "Finished merging RPC data for sample " & sampName (1Ii86EP Print "FRED formatted data file: " & Chr(9) & outFile sxQMfbN End Sub JKs&!! +)TOcxF% 'Utility function to read the contents of a file into an array of strings. I`EgR?5 ` Function ReadFile(ByVal fileName As String, _ XJi^gT N ByRef lineArray() As String) As Long O.+X,CQG* gNzamorv[ ReadFile = -1 .R{P%r Dim oFSO As Object ,]-A~ ^| Set oFSO = CreateObject("Scripting.FileSystemObject") )NS&1$ Erase lineArray !Ql&Ls I;Bci m; Dim fid As Long \}mn"y If oFSO.fileexists( fileName ) Then JD$;6Jv3P fid = FreeFile() _M7NL^B& Open fileName For Input As fid VcR(9~ lineArray = Split(Input(LOF(fid), fid), vbCrLf) w97B)Kn6 Close fid {V~Gr End If J2~oIe2!+ Set oFSO = Nothing uSK<{UT~3 Return UBound( lineArray ) :0B'
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XvspE}~y End Function .\+%Q)?h: &c1zEgl Sub GetFileList( ByVal in_dir As String, _ ]AzDkKj ByRef in_flist() As String ) w@ =U f7 tXnD>H YV 'Redimension the file list array \ )n'Ywr Erase in_flist xBi``x2eY Qcr-|?5L 'Tracks how many files are found S?Z"){ Dim fCount As Long )s4a<Sc] fCount = 0 I<ta2<h iSxuor^; 'Recurse directory and search for text files 2DTBL:?` Dim f As String p/!P kKJ f = Dir$(in_dir & "*.txt") _-/< |