RPC Photonics扩散片BSDF

/&ph-4\i   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

`[Lap=.'.   摘要： Ry/NfF=   zwAuF%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。 y ?Q"-o (   pz-`Tp w   背景： l`,`N+FG   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。 12cfqIo9   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 {feS-.Khv   ,riwxl5*E/   h2,AcM   I,?bZ&@8   步骤 ,Hp9Gkm8I/   m,=$a\UC   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 Cr(pN[,   图2. RPC Photonics工程漫射体不同类型的散射数据 OE:t!66   V+D"_   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 4(Y5n?/   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ?u8+F   例如下所示： _+^3<MT   Sample name:  EDF-C1-56 TcRnjsY$   Merging data from file EDF-C1-56 0-0.txt i |=}zR   Finished merging RPC data for sample EDF-C1-56 ~|!q>z   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt FeCQGT   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 *TMg.   a. 创建一个新的散射库 u5idH),<   b. 散射模型命名 rhL<JTS   c. 改变散射模型为“Tabulated BSDF”. tkJ/h<   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 ） v~@Y_`l   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。 _NZ) n)   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， EB\z:n5   g. 点击OK KAUYE^   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 iUl{_vb   % DRDe   rJNf&x%6   脚本代码： c#G(7.0MU   l~f +h?cF   '#Language "WWB-COM" vTB*J,6.   O<%U*:B   Option Explicit Y}|78|q*   [ BN2c   Sub Main m]u#Dm7h   4.VEE~sH$       'Cleanup blp)a       ClearOutputWindow() 29GejLg|   =z@'vu$Fh       Print "Merging RPC Photonics BSDF Data Files" Ufo-AeQo       SetTextColor(255,0,0) p p{%\td       Print "Note: Script should be located in the same folder as the BSDF TXT files." Sb{S^w\m0       Print "Note: Do not run this script multiple times without deleting the output file between executions." uCUBs(iD       SetTextColor(0,0,0) WUqAPN   auGt>,Zj\Q       'Current directory of this script (should be the same as the text files being merged) xds"n5       Dim cDir As String =%RDT9T.       cDir = MacroDir$ & "\" ViVYyA   _abVX#5<       'Array which will be populated with the list of files to be merged 3a#!^G!~       Dim fList() As String, curFile As String C g&1       GetFileList( cDir, fList ) NS&~n^*k<   se)I 2T{J       Print "" P-vA.7       Print "Files found for merging:" cBm3|@7       For Each curFile In fList m:"2I&0)WM           Print Chr(9) & curFile !C/`"JeYL       Next -7+Fb^"L   -<<!eH       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 0 TS:o/{(a       Dim nameArray() As String, sampName As String .{8lG^0U<       nameArray = Split(fList(0)," 0-0.txt") 9xu&n%L=       sampName  = nameArray(0) E+3~w?1       Print "" Ni0lj:       Print "Sample name: " & Chr(9) & sampName )s^XVs.-   +bQn2PG=       'Open an output file and write the FRED header data j+Tk|GRab       Dim outFile As String {O"dj;RU       outFile = cDir & sampName & "_FRED.txt" IGI2).$[       Open outFile For Output As #1 L9AfLw5&X       Print #1, "type bsdf_data" ! q1Ql18n       Print #1, "format angles=deg bsdf=value scale=1" $/d~bk@=l   ||_F /AD       'Loop the file list, skip the two header lines and write the remaining data to file X0=R @_KY       Dim lineArray() As String, curLine As Long wTTQIo60       For Each curFile In fList q?t>!1c           Print "Merging data from file " & curFile %M^bZ?           ReadFile( cDir & curFile, lineArray ) ?9PNCd3$d           For curLine = 2 To UBound(lineArray) t8^*s<O               Print #1, lineArray(curLine) rhUZ9Fdv           Next [Zua7&(5       Next '7=*n_l   JHMj4Zkp       'Close the output file G-:DMjvN       Close #1 9GQTe1[t4   S@*@*>s^       Print "Finished merging RPC data for sample " & sampName h2tzv~       Print "FRED formatted data file: " & Chr(9) & outFile E3KPjK   End Sub Uz62!)   8)H"w $jq   'Utility function to read the contents of a file into an array of strings. L' )(Zn1   Function ReadFile(ByVal fileName As String, _ H?B.Hp|                     ByRef lineArray() As String) As Long }k,Si9O   \tQi7yj4       ReadFile = -1 xt-;7       Dim oFSO As Object + 6}FUi!"e       Set oFSO = CreateObject("Scripting.FileSystemObject") Fm2t:,=       Erase lineArray v=L^jw   wDSU~\       Dim fid As Long *J$=UG,u       If oFSO.fileexists( fileName ) Then f{b"=hQ           fid = FreeFile() J}.p6E~j           Open fileName For Input As fid @%jzVF7           lineArray = Split(Input(LOF(fid), fid), vbCrLf) R2;-WxnN]           Close fid > h:~*g       End If ,Wdyg8&.       Set oFSO = Nothing T*H4kM       Return UBound( lineArray ) xW^<.@Agm   iI_Fbw8   End Function 2Nj0 Hqjq   &2Y>yFB ,   Sub GetFileList( ByVal in_dir As String, _ W:tE ?Hu                    ByRef in_flist() As String ) zU}0AVlIL:   >uUbWKn3       'Redimension the file list array 3Zbvf^       Erase in_flist $B(B   >M +!i+       'Tracks how many files are found Y${ $7+@       Dim fCount As Long JY_' d,O       fCount = 0 QX8N p{g-   )@sz\yI%U       'Recurse directory and search for text files eH6#'M4+\       Dim f As String \@80Z5?n       f = Dir$(in_dir & "*.txt") SWmdU]       While f <> "" *D9QwQ _|           ReDim Preserve in_flist(fCount) uS&bfx2           in_flist(fCount) = f zz$*upxK           fCount += 1 V1Fdt+#           f = Dir$() 7zNyH(.       Wend g,q&A$Wi       ReDim Preserve in_flist(fCount-1)