RPC Photonics扩散片BSDF

'n:Ft   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

RW(AjDM   摘要： lha)'   NH'RU`U)   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。 xxkP4,(p   !u6~#.7   背景： (dMFYL>YP   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。 />ob*sk/Y   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 qsvUJU   h| UT/:   Sa,N1r   y^@%Xrs   步骤 XOqpys   8@hzw~>   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。 mApn(&   图2. RPC Photonics工程漫射体不同类型的散射数据 2)j\Lg_M   \)M5o   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） l7s=b4}c   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 %4 SREq   例如下所示： u/.srK!K   Sample name:  EDF-C1-56 a|nlmH"l   Merging data from file EDF-C1-56 0-0.txt :m&`bq   Finished merging RPC data for sample EDF-C1-56 ~Y'e1w$`   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt CCEx>*E6c   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 !FSraW2   a. 创建一个新的散射库 ZC2C`S\xr   b. 散射模型命名 ~5!ukGK_   c. 改变散射模型为“Tabulated BSDF”. K6Gc)jp:b   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） xh-[]Jz(   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ='VIbE@qC   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， _5`M( ;hL2   g. 点击OK 21o_9=[^   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 "L8V!M_e   HO@T2t[   |nicvg@   脚本代码： 9d{W/t?NH   w4x8 Sre   '#Language "WWB-COM"  g u|;C   pM46I"   Option Explicit 5z]dA~;*2   [CUJA   Sub Main %x927I>   dX$])b_Uw       'Cleanup Bw_Ih|y,w       ClearOutputWindow() z!3Z^d`   mefmoZ       Print "Merging RPC Photonics BSDF Data Files" <`r+l5       SetTextColor(255,0,0) VuPET       Print "Note: Script should be located in the same folder as the BSDF TXT files." ^m+W       Print "Note: Do not run this script multiple times without deleting the output file between executions." zHdp'J"        SetTextColor(0,0,0) xc/|#TC8?   8uT6QCf       'Current directory of this script (should be the same as the text files being merged) ?s?uoZ /2       Dim cDir As String eXOFAd]>u       cDir = MacroDir$ & "\" E{fnh50^Q.   ky~x4_y5       'Array which will be populated with the list of files to be merged * QR7t:([       Dim fList() As String, curFile As String i&HV8&KygN       GetFileList( cDir, fList ) qXhrK /   4`UT_LcI       Print "" b?Jm)       Print "Files found for merging:" O#EBR<CuK       For Each curFile In fList d#d~t[=           Print Chr(9) & curFile ]rNfr-       Next gK<-*v   = ]@xXVf/       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ua[\npz5       Dim nameArray() As String, sampName As String /,>.${,;u       nameArray = Split(fList(0)," 0-0.txt") |X.z|wKT6       sampName  = nameArray(0) nB]Q^~jX       Print "" CC09:L?       Print "Sample name: " & Chr(9) & sampName K$]QzPXS   # R&[+1=9j       'Open an output file and write the FRED header data [T%blaSX       Dim outFile As String }dHiW:J>       outFile = cDir & sampName & "_FRED.txt" Q|1bF!#(1       Open outFile For Output As #1 C\; 8l}t       Print #1, "type bsdf_data" >ahj|pm       Print #1, "format angles=deg bsdf=value scale=1" ]Bsq?e^   64vSJx>u       'Loop the file list, skip the two header lines and write the remaining data to file kb:C>Y8!sC       Dim lineArray() As String, curLine As Long CIDL{i8       For Each curFile In fList bT8UmR98           Print "Merging data from file " & curFile I;v`o{           ReadFile( cDir & curFile, lineArray ) cR&xl^BJ           For curLine = 2 To UBound(lineArray) :kVV.a#g               Print #1, lineArray(curLine) ks5'Z8X           Next d0=nAZZ       Next "qsNySI   (J4utw Z       'Close the output file +o3g]0       Close #1 (FaT{W{   x-pMT3m\D#       Print "Finished merging RPC data for sample " & sampName =c,gK8C       Print "FRED formatted data file: " & Chr(9) & outFile p~.@8r(   End Sub cP1jw%3P   UIl _&|   'Utility function to read the contents of a file into an array of strings. SIlg   Function ReadFile(ByVal fileName As String, _ 5a ~tp'                     ByRef lineArray() As String) As Long l(5-Cr   l0&8vhw8k       ReadFile = -1 %p9bl ,x       Dim oFSO As Object a 98       Set oFSO = CreateObject("Scripting.FileSystemObject") *lK4yI*%o       Erase lineArray O0~d6Ba   c-.>C)       Dim fid As Long (M+<^3c       If oFSO.fileexists( fileName ) Then g5Dx9d{           fid = FreeFile() ?6QJP|kE           Open fileName For Input As fid Fsf22           lineArray = Split(Input(LOF(fid), fid), vbCrLf) j ;v%4G           Close fid E(tBN]W.       End If NXBOo       Set oFSO = Nothing $vBU}~l7       Return UBound( lineArray ) .=yus[,~   .Y|\7%(   End Function k&/)g3(N(   'j_H{kQy   Sub GetFileList( ByVal in_dir As String, _ mr!I}I7x&x                    ByRef in_flist() As String ) skz]@{38   D5pF:~tQ(j       'Redimension the file list array =%\6}xPEl<       Erase in_flist |y%].y)   #mhD; .Wg       'Tracks how many files are found eeU$uR       Dim fCount As Long ;g:bn5G       fCount = 0 \+3Wd$I   0Qp'}_       'Recurse directory and search for text files o#xg:m_py       Dim f As String HY4E       f = Dir$(in_dir & "*.txt") LUNs|\&       While f <> "" &a_kJ)J           ReDim Preserve in_flist(fCount) qffSq](D.           in_flist(fCount) = f c@-K           fCount += 1 Z9m;@<%           f = Dir$() E`fssd~       Wend ^|GtO.       ReDim Preserve in_flist(fCount-1)