RPC Photonics扩散片BSDF

Fb0r(vQ^   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

^I CSs]}1   摘要： &xYO6_.   +338z<'Z!   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。 x[_SNX"   c&GVIrJ   背景： 1z5Oi u   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。 # zbAA<f   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 W Y]   0Kytg\p}   7H l>UX,|   -/'_XR@1   步骤 T{:~v+I=   MoX~ZewWR   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。 e>] gCa   图2. RPC Photonics工程漫射体不同类型的散射数据 kR,ry:J-    nLD1j   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） 9-3, DxZ}   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{}iq@2   例如下所示： y2{uEbA   Sample name:  EDF-C1-56 ?-Zl(uX   Merging data from file EDF-C1-56 0-0.txt LpYG!Kl   Finished merging RPC data for sample EDF-C1-56 BH"Op hE   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $&~moAl   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ?bH&F   a. 创建一个新的散射库 !Soz??~o/   b. 散射模型命名 6|G&d>G$_   c. 改变散射模型为“Tabulated BSDF”. Db`SNk=   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 ） 4Y5lP00!}   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。 |W#(+m   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， j"F?^0aR,Q   g. 点击OK v6C$Y+5~   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 1)o6jGQ   :*} -,{uX   L~+/LV   脚本代码： S6CI+W   7M/v[dwL   '#Language "WWB-COM" K2> CR$L   D 0 O^=v|   Option Explicit _1,hO?TK   ;p+[R+ )   Sub Main bQ3txuha   FMi:2.E       'Cleanup C<Z{G%Qm       ClearOutputWindow() lHUd<kEC   ~NMx:PP       Print "Merging RPC Photonics BSDF Data Files" QdrZi.qKH       SetTextColor(255,0,0) .0Kc|b=w       Print "Note: Script should be located in the same folder as the BSDF TXT files." XkPE%m_5D       Print "Note: Do not run this script multiple times without deleting the output file between executions." :N^+!,i       SetTextColor(0,0,0) |z7V1xF   uc>":V       'Current directory of this script (should be the same as the text files being merged) Vak\N)=u       Dim cDir As String \(A A|;       cDir = MacroDir$ & "\" $<QrV,T   8c\\-{       'Array which will be populated with the list of files to be merged F )Iz:       Dim fList() As String, curFile As String [=BccT:b       GetFileList( cDir, fList ) o(k{Ed   45?%D}       Print "" Zz1nXUZ       Print "Files found for merging:" ]9N&I/-       For Each curFile In fList jF}-dfe           Print Chr(9) & curFile Yb=77(QV       Next iInWw"VbKe   F8S>Ld       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e }Mf       Dim nameArray() As String, sampName As String N;']&f       nameArray = Split(fList(0)," 0-0.txt") p|C[ T]J\@       sampName  = nameArray(0)  k^Q.lb {       Print "" l*?_@       Print "Sample name: " & Chr(9) & sampName ]"&](e6*   <2E|URo,#       'Open an output file and write the FRED header data -.Blj<2ah       Dim outFile As String B[I9<4}       outFile = cDir & sampName & "_FRED.txt" )n]"~I^       Open outFile For Output As #1 >%ovL8F       Print #1, "type bsdf_data" [l3ys       Print #1, "format angles=deg bsdf=value scale=1" v\[+   w_f.\\1r       'Loop the file list, skip the two header lines and write the remaining data to file XEnu0gr       Dim lineArray() As String, curLine As Long a%A!DzS       For Each curFile In fList M kL)           Print "Merging data from file " & curFile 1uO2I&B           ReadFile( cDir & curFile, lineArray ) ! ,bQ;p3g|           For curLine = 2 To UBound(lineArray) ftG3!}               Print #1, lineArray(curLine) _jc_(;KPF           Next au04F]-|j8       Next eP,bFc   '4nJ*Xa       'Close the output file xeL"FzF:V       Close #1 \{}dn,?Fv   0,nz*UDk       Print "Finished merging RPC data for sample " & sampName RC/45:hZZ       Print "FRED formatted data file: " & Chr(9) & outFile _6Y+E"@zs   End Sub 'Oj 1@0*0   'zM=[#!B   'Utility function to read the contents of a file into an array of strings. cGiL9|k   Function ReadFile(ByVal fileName As String, _ [ /YuI@C,@                     ByRef lineArray() As String) As Long xorafL   R{fJ"Q5'       ReadFile = -1 `sCn4-$8       Dim oFSO As Object FJDE48Vi       Set oFSO = CreateObject("Scripting.FileSystemObject") n m<?oI*\       Erase lineArray BZ=I/L   \XPGA uEo       Dim fid As Long ~ney~Pz_       If oFSO.fileexists( fileName ) Then d\ 8v VZ           fid = FreeFile() &iInru3           Open fileName For Input As fid #R{>@]x`           lineArray = Split(Input(LOF(fid), fid), vbCrLf) 59O-"Sc[           Close fid *I)J%#       End If ~N/r;omVc       Set oFSO = Nothing O5:bdt.       Return UBound( lineArray ) %rMCiz   0_eqO'"   End Function ICb!AsL   +]s,VSL5`   Sub GetFileList( ByVal in_dir As String, _ v&|65[<                    ByRef in_flist() As String ) 8ix_<$ %   1vxRhS&FY       'Redimension the file list array ~%8P0AP       Erase in_flist P&uSh?[ ^   ly-(F2       'Tracks how many files are found N^dQX,j       Dim fCount As Long !JDr58       fCount = 0 iCPm7AU   pY`$k#5       'Recurse directory and search for text files Vw1>d+<~-)       Dim f As String %(1OjfZc       f = Dir$(in_dir & "*.txt") ) Cl>%9       While f <> "" O|V0W iY<           ReDim Preserve in_flist(fCount) _Xt/U>N           in_flist(fCount) = f $G-<kC}8:           fCount += 1 >!t3~q1Cn           f = Dir$() dMH_:jb       Wend |gA@WV-%       ReDim Preserve in_flist(fCount-1)