RPC Photonics扩散片BSDF

,!m][   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

(5-4`:1ux   摘要： _]g?3Gw7!   Vh%=JL sK   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。 %TOYU(k   rD7L==Ld   背景： Y |NL #F   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。 @' V=Vr   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 $)V_oQSqn   jB"?iC.   4 w$f-   Q db~I#}m'   步骤 dZSv=UY)   R~=_,JUW   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。 7RH1,k   图2. RPC Photonics工程漫射体不同类型的散射数据 :P!"'&gCL   DU@ZLk3   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） yA74Rxl*6   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 &mG1V   例如下所示： XOk0_[   Sample name:  EDF-C1-56 G4VdJ(_   Merging data from file EDF-C1-56 0-0.txt }ZP;kM$g   Finished merging RPC data for sample EDF-C1-56 BqF%2{   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt '+@q   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 v2vPfb   a. 创建一个新的散射库 zvzS$Gpe   b. 散射模型命名 k7R8Q~4   c. 改变散射模型为“Tabulated BSDF”. @|N'V"*MT   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 ） R:Pw@   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。 Y?1 3_~ K   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，  k|Xxr   g. 点击OK r)9&'m.:   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 +{qX,   t[L_n m5-   %syFHUBw   脚本代码： PT`];C(he   >u6*P{;\   '#Language "WWB-COM" p "J^   RB\0o,mw4   Option Explicit x]1G u   ,-4SVj8$P   Sub Main nBVR)|+M   lphELPh       'Cleanup pl-2O $       ClearOutputWindow() mnZS](>   \[nvdvJv       Print "Merging RPC Photonics BSDF Data Files" y<53xZi       SetTextColor(255,0,0) HQpw2bdy       Print "Note: Script should be located in the same folder as the BSDF TXT files."  AU3Ou5       Print "Note: Do not run this script multiple times without deleting the output file between executions." `|Ll       SetTextColor(0,0,0) cz2guUu   0<,Q7onDD:       'Current directory of this script (should be the same as the text files being merged) Usa       Dim cDir As String ftL>oOz[       cDir = MacroDir$ & "\" BW`)q/   SkmLX@:(       'Array which will be populated with the list of files to be merged rh8.kW-K_       Dim fList() As String, curFile As String JTK0#+?       GetFileList( cDir, fList ) SGZ] _   ]m>N!Iu       Print "" fn!(cE|`E       Print "Files found for merging:" 0+i\j`O&       For Each curFile In fList |L@9q wF           Print Chr(9) & curFile wR x5` @       Next j:JM v   :X?bWxOJ       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. `I\)Kk@*b9       Dim nameArray() As String, sampName As String *=6,}rX"I       nameArray = Split(fList(0)," 0-0.txt") .7BB*!CP       sampName  = nameArray(0) OG M9e!       Print "" Cb{n4xKW6       Print "Sample name: " & Chr(9) & sampName O_f+#K)   !uC`7a       'Open an output file and write the FRED header data :3 F Je       Dim outFile As String f;Iaf#V_       outFile = cDir & sampName & "_FRED.txt" FUq>+U!Qu       Open outFile For Output As #1 v,\2$q/       Print #1, "type bsdf_data" DeMF<)#       Print #1, "format angles=deg bsdf=value scale=1" g_2m["6*   _?5$S T@5       'Loop the file list, skip the two header lines and write the remaining data to file 1j_x51p       Dim lineArray() As String, curLine As Long !A.Kb74       For Each curFile In fList |bHId!d           Print "Merging data from file " & curFile # j =r           ReadFile( cDir & curFile, lineArray ) aCL_cVOMR           For curLine = 2 To UBound(lineArray) 208dr*6U               Print #1, lineArray(curLine) :%#(<@{           Next .szs?       Next l c<&f   8?n6 \cF       'Close the output file 80/6-_g(       Close #1 5`ma#_zk|f   wU\3"!^h       Print "Finished merging RPC data for sample " & sampName o9tvf|+z       Print "FRED formatted data file: " & Chr(9) & outFile aS7[s6   End Sub " <GDOL   %cWy0:F5VY   'Utility function to read the contents of a file into an array of strings. bt$+l[U^J   Function ReadFile(ByVal fileName As String, _ STC'j1U                     ByRef lineArray() As String) As Long _` %z   vFKt=o$ g       ReadFile = -1 ?c vXuxCm       Dim oFSO As Object .ZK|%VGW       Set oFSO = CreateObject("Scripting.FileSystemObject") 9$9Pv%F:j       Erase lineArray ;'o:1{Y   *mqoyOa       Dim fid As Long @ =RH_NB       If oFSO.fileexists( fileName ) Then wYf9&}k\4           fid = FreeFile() YWfw%p?n"           Open fileName For Input As fid IZ2c<B5&           lineArray = Split(Input(LOF(fid), fid), vbCrLf) QE:%uT           Close fid `.0QY<;       End If t/6t{*-w       Set oFSO = Nothing n9J.]+@J       Return UBound( lineArray ) Z/z(P8#U\   0A~zuK   End Function ~%6GF57gC   [6bK>w"v   Sub GetFileList( ByVal in_dir As String, _ hL\gI(B                    ByRef in_flist() As String ) QfI)+pf   9s5PJj"u       'Redimension the file list array VfJbexYT       Erase in_flist 0n<t/74    oQrkd:       'Tracks how many files are found erG;M!9\       Dim fCount As Long zh hHA9       fCount = 0 cuJ%;q=;   pGZI697       'Recurse directory and search for text files 0NY2Kw;       Dim f As String _084GK9{W       f = Dir$(in_dir & "*.txt") 3^>D |       While f <> ""  &Rgy/1           ReDim Preserve in_flist(fCount) 4{d`-reHg           in_flist(fCount) = f B}= WxG|)           fCount += 1 y;N[#hY#CD           f = Dir$() !aSu;Ln       Wend LL~bq(b       ReDim Preserve in_flist(fCount-1)