RPC Photonics扩散片BSDF

e}-uU7O   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

M%1-fd   摘要： !D7[R'RgY   =3^YKI   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。 [`yiD >   &:nWZ!D   背景： Hvnak{5   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。 Yono8M;9*   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 s"=e(ob   |^^;v|   WIQt5=-   -~p@o1k0   步骤 `[C8iF*Y"   p}}}~ l C/   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。 h,\^Sb5AP   图2. RPC Photonics工程漫射体不同类型的散射数据 ~2S`y=*:   -$.$6"]   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 7"Zr:|$U   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 Fx/9T2%=   例如下所示： 6jO*rseC   Sample name:  EDF-C1-56 LGgEq-   Merging data from file EDF-C1-56 0-0.txt \@:pWe   Finished merging RPC data for sample EDF-C1-56 Z8}Zhe.   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7?]gUrE   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面  /e!/   a. 创建一个新的散射库 m32OE`s   b. 散射模型命名 sYYg5vL9   c. 改变散射模型为“Tabulated BSDF”. G$xuHHZ'   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ? Ls]k   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 X.o [=E   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， |U8;25Y   g. 点击OK X6N^<Z$   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 %Jq(,u   FwBktuS   aL-V9y   脚本代码： Ni(D[?mZ   [t: =%&B   '#Language "WWB-COM" 'N,x=1R5   OE}L})"   Option Explicit ]zhFFq`   VCX})sp   Sub Main  UY+~,a   #ie{!Mh       'Cleanup 9 /t}S6b{       ClearOutputWindow() X. UN=lu   bqS*WgMY-       Print "Merging RPC Photonics BSDF Data Files" *O$kF.3q       SetTextColor(255,0,0) O8[dPmW       Print "Note: Script should be located in the same folder as the BSDF TXT files." "sUe:F;       Print "Note: Do not run this script multiple times without deleting the output file between executions." h}g _;k5R       SetTextColor(0,0,0) ?F(t`0=   dGQy=T:       'Current directory of this script (should be the same as the text files being merged) 4TGg`$e;       Dim cDir As String 4Qz       cDir = MacroDir$ & "\" :c!7r h7O   tqmM7$}}P       'Array which will be populated with the list of files to be merged !#f4t]FM`B       Dim fList() As String, curFile As String rw ^^12)       GetFileList( cDir, fList ) VEwv22'   IE|x+RBD       Print "" 7V 2%       Print "Files found for merging:" RVXRF_I       For Each curFile In fList 6 !+xf           Print Chr(9) & curFile Lyt6DvAp"       Next :*/<eT_   \7$m[h{l       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. e@L+z       Dim nameArray() As String, sampName As String nO\|43W       nameArray = Split(fList(0)," 0-0.txt") q.K >v'       sampName  = nameArray(0) oT\B-lx       Print "" 8p-5.GU)<e       Print "Sample name: " & Chr(9) & sampName {pd% I   wZE[we^Q"       'Open an output file and write the FRED header data 96}/;e]@       Dim outFile As String Nr:%oD_G*       outFile = cDir & sampName & "_FRED.txt" '/z.\S       Open outFile For Output As #1 m&Ms[X       Print #1, "type bsdf_data" lBD{)Va       Print #1, "format angles=deg bsdf=value scale=1" p%xo@v(   dK|MQ <       'Loop the file list, skip the two header lines and write the remaining data to file !`=r('l       Dim lineArray() As String, curLine As Long #U"\v7C{n       For Each curFile In fList }1:jM_H)k           Print "Merging data from file " & curFile /n@_Ihx           ReadFile( cDir & curFile, lineArray ) J4!Z,-           For curLine = 2 To UBound(lineArray) ENA8o}n               Print #1, lineArray(curLine) gS4K](KH |           Next xDRK^nmC       Next y?_tSnDK   dQ/Xs.8       'Close the output file HR['y9U       Close #1 h&h]z[r R   p KKn       Print "Finished merging RPC data for sample " & sampName 8%arA"#S       Print "FRED formatted data file: " & Chr(9) & outFile rouD"cy   End Sub T_5 E   @#*B|lHE   'Utility function to read the contents of a file into an array of strings. B?#@<2*=L   Function ReadFile(ByVal fileName As String, _ f>#\'+l'                     ByRef lineArray() As String) As Long \<i#Jn+)   djZOx;/       ReadFile = -1 a[lE9JA;|       Dim oFSO As Object ;6fkG/ T       Set oFSO = CreateObject("Scripting.FileSystemObject") P:ys--$"       Erase lineArray .zBSjh_=H   'G@Npp)&^       Dim fid As Long *`|.:'       If oFSO.fileexists( fileName ) Then Y($"i<rN           fid = FreeFile() '9{H(DA           Open fileName For Input As fid IBES$[           lineArray = Split(Input(LOF(fid), fid), vbCrLf) &b"PjtU.X           Close fid <%qbU-       End If 6CY_8/:zL       Set oFSO = Nothing dkG-Yz~       Return UBound( lineArray ) _.?$~;7   h8pc<t\6   End Function BIw9@.99B-   6l:CDPhR   Sub GetFileList( ByVal in_dir As String, _ B:^5W{                    ByRef in_flist() As String ) N<$uAns   e0v&wSi       'Redimension the file list array ?y]3kU       Erase in_flist Qnr' KbK   2s|[!:L5       'Tracks how many files are found n?kU       Dim fCount As Long _wZ(%(^I       fCount = 0 )oAK)e   \W/cC'       'Recurse directory and search for text files JfKl=vg       Dim f As String Xa9G;J$       f = Dir$(in_dir & "*.txt") jUW{Z@{U       While f <> "" zcIZJVYA           ReDim Preserve in_flist(fCount) ApU5,R0           in_flist(fCount) = f 9FcCq*D           fCount += 1 2MtaOG2l&q           f = Dir$() !. q*bY       Wend R^%7|       ReDim Preserve in_flist(fCount-1)