RPC Photonics扩散片BSDF

b?8)7.{F{   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

TkRm V6'w   摘要： Xd3}Vn=   49AW6H.JT   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。 rh66_eV   iPvuz7j=h   背景：  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。 le8 #Z}p   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 22&;jpL'?   a7#?h%wf   .fp&MgiQ   kJT+   步骤 QTH7grB2v   Be2lMC   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。 rOcg+5   图2. RPC Photonics工程漫射体不同类型的散射数据 uH:YKH':/   t0Mx!p'T   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） eVJ^\z:4   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 cG{L jt   例如下所示： vcv CD7MD   Sample name:  EDF-C1-56 du_4eB   Merging data from file EDF-C1-56 0-0.txt =^tA_AxVw   Finished merging RPC data for sample EDF-C1-56 uOd&XW   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt l$XPIC~H   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 [%pRfjM   a. 创建一个新的散射库 mV)+qXC   b. 散射模型命名 @kxel`,$e   c. 改变散射模型为“Tabulated BSDF”. r^1+cwy/7P   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 ） 5)UQWnd5   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。 4CrLkr   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， %S \8.   g. 点击OK M'L;N!1A   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 %\Wf^6Y^   }Wh6zT)   =r9r~SR#   脚本代码： Lja7   te,[f   '#Language "WWB-COM" gE])!GMM3   ,|h)bg7.   Option Explicit oM1Qh?   NxA)@9Q   Sub Main _S`o1^Ad   mJ}opy!{;       'Cleanup @t*t+Vqw       ClearOutputWindow() ,xfO;yd   k{I01       Print "Merging RPC Photonics BSDF Data Files" eE@&ze>X       SetTextColor(255,0,0) `5~3G2T       Print "Note: Script should be located in the same folder as the BSDF TXT files." 4 %W:       Print "Note: Do not run this script multiple times without deleting the output file between executions." Qk1xUE       SetTextColor(0,0,0) &(N+.T5cp   )"+2Z^1-       'Current directory of this script (should be the same as the text files being merged) ,9D+brm       Dim cDir As String 4\M.6])_       cDir = MacroDir$ & "\" `bjizS'^   ZJ*g))k7       'Array which will be populated with the list of files to be merged ]#2Y e7+       Dim fList() As String, curFile As String T0zn,ej       GetFileList( cDir, fList ) ;j8)KC   kwpK1R4zs       Print "" Tr0B[QF       Print "Files found for merging:" $*R/tJ.       For Each curFile In fList U}k9 Py           Print Chr(9) & curFile GH1"xR4!       Next A:l@_*C..   jPZa D>!       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kOo~%kcQ'       Dim nameArray() As String, sampName As String 9ZXlR?GA       nameArray = Split(fList(0)," 0-0.txt") L;Z0 `mdz       sampName  = nameArray(0) XolZonJr       Print "" NKb1LbnZ*y       Print "Sample name: " & Chr(9) & sampName ma'FRt   )Gw~XtB2       'Open an output file and write the FRED header data E.|-?xQ6       Dim outFile As String GV HV =E       outFile = cDir & sampName & "_FRED.txt" I/gjenUK       Open outFile For Output As #1 ,Uhb       Print #1, "type bsdf_data" V'*~L\;pU       Print #1, "format angles=deg bsdf=value scale=1" a2Pf/D]n   I`KQ|h0%       'Loop the file list, skip the two header lines and write the remaining data to file %\|'%/"`2(       Dim lineArray() As String, curLine As Long ~w8JH2O       For Each curFile In fList n_ lo`           Print "Merging data from file " & curFile &`0/CV           ReadFile( cDir & curFile, lineArray ) ?;/^Ya1;Z           For curLine = 2 To UBound(lineArray) 1$qh`<\               Print #1, lineArray(curLine) '52~$z#m           Next ]0hrRA`       Next g<{xC_J   $un?0S       'Close the output file )XcOl7XLN       Close #1 5%sE]Y#   _4^R9Bt       Print "Finished merging RPC data for sample " & sampName EF3Cdu{]P       Print "FRED formatted data file: " & Chr(9) & outFile ;4N;D   End Sub !*6CWV0   7qTE('zt   'Utility function to read the contents of a file into an array of strings. L|bwZ,M=}?   Function ReadFile(ByVal fileName As String, _ mU}F!J#6                     ByRef lineArray() As String) As Long jReXyRmo({   rV08ad       ReadFile = -1 _uc hU=       Dim oFSO As Object !uQPc       Set oFSO = CreateObject("Scripting.FileSystemObject") p+)YTzzc       Erase lineArray B,,D7cQC   Sb~MQ_       Dim fid As Long k '0Pi6       If oFSO.fileexists( fileName ) Then Xy5e5K           fid = FreeFile() ?-^~f           Open fileName For Input As fid ZXm/A0)S           lineArray = Split(Input(LOF(fid), fid), vbCrLf) (}}S9K           Close fid `ZC<W]WYX/       End If Yw#2uh       Set oFSO = Nothing s%<e D       Return UBound( lineArray ) Q7W>qe%4   /7gOSwY   End Function M)SEn/T-   OpHsob~   Sub GetFileList( ByVal in_dir As String, _ XQw>EZdj_N                    ByRef in_flist() As String ) N<~ku<nAU   l\C.",CEcc       'Redimension the file list array 6Fe34n]m       Erase in_flist 9-MUX^?u   !"Oh36       'Tracks how many files are found T#>7ub       Dim fCount As Long P#AW\d^"B       fCount = 0 i>(e}<i   VNY%R,6       'Recurse directory and search for text files Dc,I 7F|%       Dim f As String i-6Z"b{       f = Dir$(in_dir & "*.txt") qT+%;(       While f <> "" vh$%9ed           ReDim Preserve in_flist(fCount) b9!FC$^J           in_flist(fCount) = f 6fw(T.Pe           fCount += 1 0\eIQp           f = Dir$() <~WsD)=$       Wend {E@Lft-       ReDim Preserve in_flist(fCount-1)