RPC Photonics扩散片BSDF

^hM4j{ |&M   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

$%#!bV   摘要： O_7|C\]   aX'*pK/-   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。 Why`ziks   sUQ@7sTj   背景： hRhe& ,v   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。 @I?=<Riu   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 htF] W|z   3XV/Fb}!(i   0aB;p7~&   @*(( 1(q   步骤 oap4rHk}   )Ql%r?(F+   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。 %>{0yEC   图2. RPC Photonics工程漫射体不同类型的散射数据 x s|FE3:a   NC (~l   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） @Jw-8Q{   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 (O3nL.   例如下所示： %*}(}~   Sample name:  EDF-C1-56 EaN6^S=   Merging data from file EDF-C1-56 0-0.txt /PIcqg   Finished merging RPC data for sample EDF-C1-56 4H &+dRI"   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?6WY:Zec@   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 `b$.%S8uj=   a. 创建一个新的散射库 L4nYXW0y   b. 散射模型命名 T_4/C2   c. 改变散射模型为“Tabulated BSDF”. |CRn c:   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） 4,DeHJjAlE   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ]}Yl7/gM1}   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， X 'iWJ8   g. 点击OK /7YIn3   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 KbeC"mi   %EB/b   zTU0HR3A   脚本代码： }qD\0+`qi   >z@0.pN]7   '#Language "WWB-COM" ]h5tgi?_l   oUlVI*~ND   Option Explicit 9G2FsM|,   61U09s%\0   Sub Main jmZI7?<z   a\*yZlXKs       'Cleanup =T7.~W       ClearOutputWindow() uwGc@xOgg,   Qo|\-y-#       Print "Merging RPC Photonics BSDF Data Files" GZIa4A       SetTextColor(255,0,0) X"%gQ.1|{j       Print "Note: Script should be located in the same folder as the BSDF TXT files." 4j^ @wV'       Print "Note: Do not run this script multiple times without deleting the output file between executions." Xsa].       SetTextColor(0,0,0) Ig{0Z">   h/Y'<:       'Current directory of this script (should be the same as the text files being merged) G18b$z       Dim cDir As String c7H^$_^=       cDir = MacroDir$ & "\" U]rRQ d/:;   `Urhy#LC       'Array which will be populated with the list of files to be merged !j-Z Lq:;       Dim fList() As String, curFile As String wUJcmM;       GetFileList( cDir, fList ) pd$[8Rmj_   5)X=*I       Print "" xyXa .       Print "Files found for merging:" x kD6Iw       For Each curFile In fList I7]8Y=xf           Print Chr(9) & curFile gs`q6f%(       Next .T`%tJ-Em   CAf6:^0       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -mh3DhJ,       Dim nameArray() As String, sampName As String g<qaXv       nameArray = Split(fList(0)," 0-0.txt") {_*yGK48n       sampName  = nameArray(0) E"IZ6)Q       Print "" ~"A0Rs=       Print "Sample name: " & Chr(9) & sampName .e-# yET   #w=~lq)9       'Open an output file and write the FRED header data yB!dp;gM{       Dim outFile As String |w3M7;~eF       outFile = cDir & sampName & "_FRED.txt" m]&SNz=       Open outFile For Output As #1 3XNCAb2       Print #1, "type bsdf_data" N2o7%gJw       Print #1, "format angles=deg bsdf=value scale=1" /$%%s=@IL   nJ;.Td       'Loop the file list, skip the two header lines and write the remaining data to file e|r`/:M       Dim lineArray() As String, curLine As Long }6ldjCT/,       For Each curFile In fList %"-5 <6d           Print "Merging data from file " & curFile NHE18_v5           ReadFile( cDir & curFile, lineArray ) G#$-1"!`           For curLine = 2 To UBound(lineArray) J .<F"r>               Print #1, lineArray(curLine) Iga024KR           Next vih9KBT       Next 4^d?D!j   y1#1Ne_       'Close the output file 2~2 O V       Close #1 /mZE/>&~,   ),!q TjD       Print "Finished merging RPC data for sample " & sampName =EsavN       Print "FRED formatted data file: " & Chr(9) & outFile xyxy`qRA   End Sub _ "{Xi2@H   }-`4DHgq   'Utility function to read the contents of a file into an array of strings. {.]7!ISl5   Function ReadFile(ByVal fileName As String, _ !n%j)`0M                     ByRef lineArray() As String) As Long W%Fv p;\`   K)P%;X       ReadFile = -1 rT>wg1:       Dim oFSO As Object VtohL+       Set oFSO = CreateObject("Scripting.FileSystemObject") Fj!U|l\_9       Erase lineArray *NQ/UXE   h yIV.W/       Dim fid As Long 8?C5L8)       If oFSO.fileexists( fileName ) Then mp3s-YfRc           fid = FreeFile() oL<St$1           Open fileName For Input As fid ./~(7o$           lineArray = Split(Input(LOF(fid), fid), vbCrLf) Yr|4Fl~U           Close fid IVmo5,&5(       End If  AOx[       Set oFSO = Nothing 2t,zLwBdnJ       Return UBound( lineArray ) 8b=_Y;   ##ANrG l   End Function Q59W#e)   T8NxJmYqB   Sub GetFileList( ByVal in_dir As String, _ ;n},"&                    ByRef in_flist() As String )  T]$U""   Vw"\ {`       'Redimension the file list array % u6Sr5A[s       Erase in_flist 8;X-)&R   048kPXm`       'Tracks how many files are found _vZOZKS+       Dim fCount As Long )`}:8y?       fCount = 0 PI<vxjOK`   T9&1VW       'Recurse directory and search for text files Q@HV- (A       Dim f As String g,Y/M3>(       f = Dir$(in_dir & "*.txt") BerwI 7!=       While f <> "" u=yOu^={           ReDim Preserve in_flist(fCount) .|=\z9_7S8           in_flist(fCount) = f xezcAwW           fCount += 1 :Qq#Z           f = Dir$() {XHh8_^&       Wend ?%kV?eu'       ReDim Preserve in_flist(fCount-1)