RPC Photonics扩散片BSDF

*;F:6p4_   RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

+p$lVnAt   摘要： 4HpKKhv"   J06D_'{   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。 :%h|i&B   ltKMvGEF   背景： MpTOC&NG%s   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。 :x3xeVtY   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。 图1. RPC Photonics工程漫射体结构及光束投射形状 Yy;BJ_   ZSr!L@S   >uDC!0)R   {q^UWv?1   步骤 D^}2ilk!   q8HnPXV   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。 j<k-w   图2. RPC Photonics工程漫射体不同类型的散射数据 #N;&^El   LQR^lD+_=   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） z6P~HF+&h   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 AY;[v.Ff4   例如下所示： r`pf%9k   Sample name:  EDF-C1-56 '<>?gE0Cd   Merging data from file EDF-C1-56 0-0.txt c7.M\f P   Finished merging RPC data for sample EDF-C1-56 bz1AmNZ G   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7* [   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 0\,!   a. 创建一个新的散射库 nTD4^'   b. 散射模型命名 yMC6 Gvp   c. 改变散射模型为“Tabulated BSDF”. T=RabKVYP   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 ） S~R[*Gk_uT   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#y_EpL"   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， =\mJ5v"hA   g. 点击OK ~z, qr09   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 d%RH]j4   [7NO !^   $<"I*l@   脚本代码： :, 3S5!(y   ~=I:go   '#Language "WWB-COM" [KCR@__   Q3Y(K\   Option Explicit +~=j3U   R&$fWV;'   Sub Main y.s\MWvv>u   3E0C$vKM       'Cleanup m4yWhUi(o       ClearOutputWindow() t,Q"Pt?   5m;BL+>YE       Print "Merging RPC Photonics BSDF Data Files" EB@rIvUi,       SetTextColor(255,0,0) 4?bvJJuf)       Print "Note: Script should be located in the same folder as the BSDF TXT files." > 6=3y4tP       Print "Note: Do not run this script multiple times without deleting the output file between executions." IkG;j+=       SetTextColor(0,0,0) Az-!X!O*f   ;/kmV~KG       'Current directory of this script (should be the same as the text files being merged) IM,4Si2       Dim cDir As String <; uM/vSi       cDir = MacroDir$ & "\" mD|Q+~=|e   fsWIz1K       'Array which will be populated with the list of files to be merged )."dqq^ q       Dim fList() As String, curFile As String >&k`NXS|V       GetFileList( cDir, fList ) cmAdQ)(Kzd   _g-0"a{-       Print "" LFZ*mRiuKE       Print "Files found for merging:" `~=NBN=tiL       For Each curFile In fList EXwU{Hl           Print Chr(9) & curFile f0R+Mz8{       Next `C$QR 8   EWY'E;0@5       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3}fhU{ -c       Dim nameArray() As String, sampName As String `U|zNizO       nameArray = Split(fList(0)," 0-0.txt") WJ LqH<       sampName  = nameArray(0) b`%!\I       Print "" K D\sU6       Print "Sample name: " & Chr(9) & sampName F,Ve,7kh   UJ(UzKq8       'Open an output file and write the FRED header data wQ~]VVRN       Dim outFile As String #sk~L21A       outFile = cDir & sampName & "_FRED.txt" ,?HM5c{'[Y       Open outFile For Output As #1 n,LM"N:        Print #1, "type bsdf_data" `M(st%@n       Print #1, "format angles=deg bsdf=value scale=1" h%NM%;"H/   fVVD}GM=       'Loop the file list, skip the two header lines and write the remaining data to file kbJ4CF}H       Dim lineArray() As String, curLine As Long c-!3wvt)       For Each curFile In fList =+I-9=           Print "Merging data from file " & curFile z-:>[Sn           ReadFile( cDir & curFile, lineArray ) k*!iUz{]           For curLine = 2 To UBound(lineArray) q*C-DiV               Print #1, lineArray(curLine) 3N|6?'m           Next *-uzsq.W       Next @1<VvW=   Aa]3jev       'Close the output file :z *jl'L       Close #1 7+IRI|d   -WR<tkK       Print "Finished merging RPC data for sample " & sampName "Nz@jv?       Print "FRED formatted data file: " & Chr(9) & outFile ^zS;/%   End Sub SJlE!MK   F6b;qb6n   'Utility function to read the contents of a file into an array of strings. wZW\r!Us   Function ReadFile(ByVal fileName As String, _ ~*UY[!+4^=                     ByRef lineArray() As String) As Long DsD? &:   }TAG7U*       ReadFile = -1 tmM; Z(9t       Dim oFSO As Object Li$2 Gpc/       Set oFSO = CreateObject("Scripting.FileSystemObject") N8x.D-=gG       Erase lineArray m{~L Fhhd1   ZLPj1L       Dim fid As Long ]*Q,~uV^|       If oFSO.fileexists( fileName ) Then {MTtj4$           fid = FreeFile() };EB           Open fileName For Input As fid UI%4d3            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4\g[&           Close fid |JP'j1 Ka       End If 6l &!4r@}       Set oFSO = Nothing i1A<0W|       Return UBound( lineArray ) b!`Ze~V   Jf\`?g3#   End Function mZmEE2h   s.n:;8RibP   Sub GetFileList( ByVal in_dir As String, _ L/I ] NA!U                    ByRef in_flist() As String ) U@{>+G[   @LDs$"f9=       'Redimension the file list array *K@O3n        Erase in_flist Z glU{sU   IiE^HgM       'Tracks how many files are found W:6#0b"_#       Dim fCount As Long %+;l|Z{Uf       fCount = 0 01uj-!D$@   4FZ/~Y1}       'Recurse directory and search for text files v\qyDZVV       Dim f As String ! hEZV&y       f = Dir$(in_dir & "*.txt") Sm?|,C3V       While f <> "" RAws{<6T-           ReDim Preserve in_flist(fCount) C8)Paop$           in_flist(fCount) = f %}Y&qT?           fCount += 1 </?ef&           f = Dir$() o@]n<ZYo       Wend  6E:H       ReDim Preserve in_flist(fCount-1)