RPC Photonics扩散片BSDF

Zi=/w   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

!!?TkVyEyM   摘要： &$g{i:)Z   W!t =9i   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。 yXT8:2M   3>QkO.b   背景： ???`BF[|   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。 ,9Si3vn   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 T7 ~ H|%   cPy/}A   G4](!f!Kv   3t9Weo)   步骤 y~n1S~5cI   #pcgfVl   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。 B;e (5y-   图2. RPC Photonics工程漫射体不同类型的散射数据 5yk#(i7C   ez<V   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） =~_    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 B,A,5SuMk   例如下所示： oju,2kpH7#   Sample name:  EDF-C1-56 55Y a(E   Merging data from file EDF-C1-56 0-0.txt l}SHR|7<   Finished merging RPC data for sample EDF-C1-56 |p.|zH   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &&g02>gE   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 .tcdqL-'   a. 创建一个新的散射库 1]69S(   b. 散射模型命名 +\]Gu(z<   c. 改变散射模型为“Tabulated BSDF”. &EmG\vfE   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 ） /mXxj93UA   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。 '^)}"sZ@G   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， LhRd0   g. 点击OK 6=:s3I^   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 VwOcWKD   Vh{(*p   y*%uGG5   脚本代码： 5]xSK'6W   h0$Y;=YA   '#Language "WWB-COM" O,JS*jXl   _iL?kf   Option Explicit 6H=gura&   X|-[i hp;   Sub Main :V1j*)   ~7anj.       'Cleanup #a9O3C/MP       ClearOutputWindow() (x fN=Te,-   "T9UedZ       Print "Merging RPC Photonics BSDF Data Files" kH8/ 8       SetTextColor(255,0,0) .,20_<j%=       Print "Note: Script should be located in the same folder as the BSDF TXT files." 5|5p -B       Print "Note: Do not run this script multiple times without deleting the output file between executions." 1ktxG1"1       SetTextColor(0,0,0) P0pBR_:o   Z&O6<=bg!       'Current directory of this script (should be the same as the text files being merged) bQ(-M:       Dim cDir As String IVY)pS"pR"       cDir = MacroDir$ & "\" Re&"Q8I.8   v&bG`\!       'Array which will be populated with the list of files to be merged Evd|_W-       Dim fList() As String, curFile As String ?}uuTNLl)       GetFileList( cDir, fList ) 3{fg3?   bF6J>&]!       Print "" `BVmuUMm       Print "Files found for merging:" A; wT`c       For Each curFile In fList sM+~x<}0           Print Chr(9) & curFile L$BV`JWPw       Next K_@?Q@#YhR   @$~IPg[J       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. K|YB)y       Dim nameArray() As String, sampName As String K{{_qFj@<y       nameArray = Split(fList(0)," 0-0.txt") J>5rkR@/       sampName  = nameArray(0) 7f4O~4.[i       Print "" &7oL2Wf       Print "Sample name: " & Chr(9) & sampName GX0zir z   &a;?o~%*]i       'Open an output file and write the FRED header data IzJq: G.       Dim outFile As String px"H       outFile = cDir & sampName & "_FRED.txt" xP!QV~$>       Open outFile For Output As #1 Zskj?+1       Print #1, "type bsdf_data" 6y~F'/ww       Print #1, "format angles=deg bsdf=value scale=1" QeG9CS)E}j   ?*%_:fB       'Loop the file list, skip the two header lines and write the remaining data to file }Uwji       Dim lineArray() As String, curLine As Long naW!b&:       For Each curFile In fList y?3.W           Print "Merging data from file " & curFile 50j8+xJPV           ReadFile( cDir & curFile, lineArray ) [ r8 ZAS           For curLine = 2 To UBound(lineArray) @1Q-.54a               Print #1, lineArray(curLine) {X&lgj           Next JD~;.3$/k       Next ?)y^ [9   [104;g <       'Close the output file Vh;zV Y       Close #1 8v4 o+wP   yB2h/~+       Print "Finished merging RPC data for sample " & sampName =I'3C']Z W       Print "FRED formatted data file: " & Chr(9) & outFile 6e B;   End Sub `om+p?j   1XMR7liE   'Utility function to read the contents of a file into an array of strings. v $W[(   Function ReadFile(ByVal fileName As String, _ dy&UF,l6                     ByRef lineArray() As String) As Long ]MV8rC[\   `daqzn       ReadFile = -1 /}(d'@8p       Dim oFSO As Object =d<Rg wscJ       Set oFSO = CreateObject("Scripting.FileSystemObject") Y8\P"qb       Erase lineArray $+!dP{   @)?]u U"L       Dim fid As Long o)/Pr7Qn       If oFSO.fileexists( fileName ) Then NEIkG>\7q           fid = FreeFile() 6(Pan%           Open fileName For Input As fid ^ RA'E@"           lineArray = Split(Input(LOF(fid), fid), vbCrLf) [d6!           Close fid xi=ApwNj       End If TZAd{EZa       Set oFSO = Nothing UJ)pae       Return UBound( lineArray ) '6#G$   HUi?\4   End Function _1p8(n   ?)xIn)#ls   Sub GetFileList( ByVal in_dir As String, _ "6$V1B0KW                    ByRef in_flist() As String ) bf"'xn9   )U?_&LY)[M       'Redimension the file list array a/sjW       Erase in_flist uZS:   G@[8P?M=Z       'Tracks how many files are found *?rWS"B       Dim fCount As Long -n|bi cP       fCount = 0 =?<WCR C*   %9J@##+       'Recurse directory and search for text files ;*<tU n^t       Dim f As String $J`O-"M       f = Dir$(in_dir & "*.txt") Ke\\B o,       While f <> "" %lF*g           ReDim Preserve in_flist(fCount) r~t`H*C)}           in_flist(fCount) = f `Y#At3{           fCount += 1 9\?OV@           f = Dir$() { ^VtD       Wend &O&HczO       ReDim Preserve in_flist(fCount-1)