RPC Photonics扩散片BSDF

vr$z6m ^   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

g$mqAz<   摘要： ,62BZyT,T,   h|ja67VG   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 D66!C{   `;&=m, W'   背景： >c.HH}O0W   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 ,J'@e+jV   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 [bd?$qi   O9Yk5b;   }:+P{   EZ^M?awB4   步骤 e3kdIOu5   x2+M0 }g   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。 'Y5=A!*@tf   图2. RPC Photonics工程漫射体不同类型的散射数据 RueL~$*6.~   #K/#-S   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） G_?qY#"(   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 IeBb#Qedz   例如下所示： Xj21:IMR   Sample name:  EDF-C1-56 n/IDq$/P   Merging data from file EDF-C1-56 0-0.txt 92L{be;SY   Finished merging RPC data for sample EDF-C1-56 9R4q^tGR\   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt m`8tHHF   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =eG:Scoug?   a. 创建一个新的散射库 <nn!9V\C    b. 散射模型命名 '8fL)Zk   c. 改变散射模型为“Tabulated BSDF”. 9wv 7HD|   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 ） i%9xt1c_   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。 ~ *P9_<   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， cin3)lm   g. 点击OK +K[H!fD   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 +IfU 5&5<   Ib$ ?[   Zh.[f+l]   脚本代码： Mhg_z.Z   p\M\mK   '#Language "WWB-COM" sTO9>~sj   7(KVA1P66   Option Explicit 1FmVx   lF!Iu.MM 9   Sub Main >"+bL6#   u< .N\/       'Cleanup %ck/ Z       ClearOutputWindow() Toc="F`SW   C?%Oi:Gi&       Print "Merging RPC Photonics BSDF Data Files" 0"$'1g^]7       SetTextColor(255,0,0) G7H'OB &       Print "Note: Script should be located in the same folder as the BSDF TXT files." ,Mw;kevw       Print "Note: Do not run this script multiple times without deleting the output file between executions." O PVcT       SetTextColor(0,0,0) /h73'"SpDy   @60/IE{-v       'Current directory of this script (should be the same as the text files being merged) V .VV:`S       Dim cDir As String viR-h iD       cDir = MacroDir$ & "\" d512Y[ R   1]Gp\P}       'Array which will be populated with the list of files to be merged "WHt9 yZ       Dim fList() As String, curFile As String w.\#!@kZ!       GetFileList( cDir, fList ) 3 L(vZ2&   X vspE}~y       Print "" fQOh%i9n5       Print "Files found for merging:" >vY5%%}       For Each curFile In fList .m\'|%           Print Chr(9) & curFile 0^rDf L       Next B>W!RyH8o   E`>u*D$un~       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6H}8^'/u       Dim nameArray() As String, sampName As String xu 7Q^F#u       nameArray = Split(fList(0)," 0-0.txt") 5 MD=o7O^       sampName  = nameArray(0) x(/{]$h       Print "" 9N]V F'       Print "Sample name: " & Chr(9) & sampName kI>PaZ`i)    MUd 9R       'Open an output file and write the FRED header data )S6"I       Dim outFile As String zwJVi9sO       outFile = cDir & sampName & "_FRED.txt" ",qJG]_ <       Open outFile For Output As #1 vtVc^j4       Print #1, "type bsdf_data" T.p:`}Ma       Print #1, "format angles=deg bsdf=value scale=1" N61\]BN<   s >^$: wzu       'Loop the file list, skip the two header lines and write the remaining data to file ==pGRauq       Dim lineArray() As String, curLine As Long CA{(x(W\:       For Each curFile In fList ^w|apI~HSE           Print "Merging data from file " & curFile 41V}6+$g           ReadFile( cDir & curFile, lineArray ) s5'So@L8           For curLine = 2 To UBound(lineArray) Fxr$j\bm               Print #1, lineArray(curLine) 2{o eJ           Next xK3}zN$T       Next x<%V&<z1g   R59' KR2?       'Close the output file |}>;wZ[7       Close #1 oCftI':@   L4L[@tMPmY       Print "Finished merging RPC data for sample " & sampName yl[6b1       Print "FRED formatted data file: " & Chr(9) & outFile wNgS0{}&`   End Sub _<i*{;kR6   w,QO!)j!   'Utility function to read the contents of a file into an array of strings. .;xt{kK   Function ReadFile(ByVal fileName As String, _ uY6|LTK&x                     ByRef lineArray() As String) As Long P@z,[,sy"$   y=)xo7(       ReadFile = -1  1ZF>e`t8       Dim oFSO As Object T[YGQT|B       Set oFSO = CreateObject("Scripting.FileSystemObject") }}'0r2S       Erase lineArray mt(2HBNoz   %!i|"FNc       Dim fid As Long (n,! v)       If oFSO.fileexists( fileName ) Then r g$2)z1           fid = FreeFile() R~R?0aq           Open fileName For Input As fid 7FiQTS B:           lineArray = Split(Input(LOF(fid), fid), vbCrLf) ]wQ#8}zO           Close fid eJ23$VM+9       End If _v9P0W^.7       Set oFSO = Nothing <8Zm}-U       Return UBound( lineArray ) \Y{^Q7!>:8   VTt{0 ~   End Function +w]KK6   >$yqx1=jW   Sub GetFileList( ByVal in_dir As String, _ n(MVm-H                    ByRef in_flist() As String ) XPt<k&o1,   DJmT]Q]o)       'Redimension the file list array mw*BaDN@Q       Erase in_flist =R <X!@   eaxp(VX?oy       'Tracks how many files are found s@ ~Y!A       Dim fCount As Long O*ql!9}E{       fCount = 0 7O,y%NWaK   &7YTz3aj       'Recurse directory and search for text files `]8z]PD       Dim f As String 18AKM       f = Dir$(in_dir & "*.txt") d}.*hgk       While f <> "" ,L"1Ah           ReDim Preserve in_flist(fCount) cN5,\I.           in_flist(fCount) = f zNs8yMnFr           fCount += 1 !Deg!f\g           f = Dir$() `bJ+r)+5       Wend X. =%       ReDim Preserve in_flist(fCount-1)