RPC Photonics扩散片BSDF

-B +4+&{T   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

F w?[lS   摘要： ZHa"isl$e   YPxM<Gfa8   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 . mR8q+I6   {;2PL^i   背景： YOcO4    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 a|X a3E   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 &q9T9AOS   @{25xTt   'dn]rV0(C    094o'k   步骤 W)bLSL]`E   gw!vlwC&T   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 7<*yS310   图2. RPC Photonics工程漫射体不同类型的散射数据  qi^7   m^zUmrj[   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） K|epPGRr   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 `x*Pof!Io   例如下所示： Fe4(4   Sample name:  EDF-C1-56 5?x>9Ca   Merging data from file EDF-C1-56 0-0.txt Qnsi`1mASr   Finished merging RPC data for sample EDF-C1-56 [1S|dc>.O%   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %$.3V#?   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 rbWP78   a. 创建一个新的散射库 lNYt`xp   b. 散射模型命名 )?anOD[   c. 改变散射模型为“Tabulated BSDF”. ;>Ib^ov   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 ） ZpQ)IHA.   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。 2fL;-\!y(   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， glDu2a,Q   g. 点击OK T{-CkHf9Q   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 bE !GJZ   ?82xdpg   "~|6tQLc   脚本代码： |IzPgC   ) b (B   '#Language "WWB-COM" .(cw>7e3D    "y}--   Option Explicit b0Ps5G\ u   e w$B)W   Sub Main uxr #QA   sYI-5D]       'Cleanup V2wb%;q       ClearOutputWindow() iP7(tnlW$   zBzZxK>$       Print "Merging RPC Photonics BSDF Data Files" "ut39si       SetTextColor(255,0,0) )"7iJb<E       Print "Note: Script should be located in the same folder as the BSDF TXT files." ~qTx|",       Print "Note: Do not run this script multiple times without deleting the output file between executions." *XIF)Q=<>       SetTextColor(0,0,0) -lY6|79bF   W{ q U       'Current directory of this script (should be the same as the text files being merged) vdc\R?       Dim cDir As String .1Dg s=|       cDir = MacroDir$ & "\" Q+{xZ'o"Z   B|C2lu       'Array which will be populated with the list of files to be merged _@ qjV~%Sy       Dim fList() As String, curFile As String OrY/`+Cog       GetFileList( cDir, fList ) 52Z2]T c,   L [pBB       Print "" nFHUy9q       Print "Files found for merging:" :(P9mt       For Each curFile In fList ,is3&9           Print Chr(9) & curFile 6d<r= C=       Next qN9(S:_Px   (R=:X+ k       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (c=6yV@       Dim nameArray() As String, sampName As String 1#< '&Lr       nameArray = Split(fList(0)," 0-0.txt") Nk? ^1n$       sampName  = nameArray(0) $r@zs'N       Print "" iL-(O;n       Print "Sample name: " & Chr(9) & sampName *&^Pj%DX   R'as0 u\       'Open an output file and write the FRED header data BYL)nCc       Dim outFile As String ,~N/- 5       outFile = cDir & sampName & "_FRED.txt" On9A U:\       Open outFile For Output As #1 FpmM63$VN[       Print #1, "type bsdf_data" k8&;lgO'       Print #1, "format angles=deg bsdf=value scale=1" +>6iYUa   o,\$ZxSlm       'Loop the file list, skip the two header lines and write the remaining data to file un mJbY;t       Dim lineArray() As String, curLine As Long 6 $4[gcL'       For Each curFile In fList '}53f2%gKa           Print "Merging data from file " & curFile 'uSn}hm           ReadFile( cDir & curFile, lineArray ) -A^_{4X           For curLine = 2 To UBound(lineArray) c<B/V0]               Print #1, lineArray(curLine)  dVtG/0           Next ] vHF~|/-       Next /$Nsd   qZ}^;)a^       'Close the output file AUG#_HE]k       Close #1 [.7d<oY   )4e.k$X^       Print "Finished merging RPC data for sample " & sampName ^1I19q       Print "FRED formatted data file: " & Chr(9) & outFile ?Jm^<   End Sub Cgk<pky1   ]nn 98y+   'Utility function to read the contents of a file into an array of strings. &AeX    Function ReadFile(ByVal fileName As String, _ t%0VJB,Q2                     ByRef lineArray() As String) As Long BO?%'\   ?=Z?6fw       ReadFile = -1 KxJ!,F{>H       Dim oFSO As Object oq Xg       Set oFSO = CreateObject("Scripting.FileSystemObject") XJ;57n-?       Erase lineArray G5BfNU   m]6mGp       Dim fid As Long yLvDMPj       If oFSO.fileexists( fileName ) Then jp%S3)           fid = FreeFile() ;WQve_\           Open fileName For Input As fid 2`K=Hby           lineArray = Split(Input(LOF(fid), fid), vbCrLf) I{C SH           Close fid BA:VPTZq       End If SwGx?U       Set oFSO = Nothing Z"xvh81P       Return UBound( lineArray ) I^-Sb=j?Z   UcHJR"M~c   End Function rH Lm\3   Jq-]7N%k/   Sub GetFileList( ByVal in_dir As String, _ rpha!h>w1%                    ByRef in_flist() As String ) Gx/Oi)&/   !c Hum       'Redimension the file list array 9s q       Erase in_flist dFB]~QEK   _ ]ipajT       'Tracks how many files are found L~OvY        Dim fCount As Long m=:9+z       fCount = 0 +{.WQA}z\   %YscBG       'Recurse directory and search for text files e#8Q L       Dim f As String zR:L!S       f = Dir$(in_dir & "*.txt") ITI)soa~       While f <> "" rglXs           ReDim Preserve in_flist(fCount) .uZ3odMlx           in_flist(fCount) = f }o(-=lF           fCount += 1 mO7 ]9p           f = Dir$() *w\W/Y       Wend <iC(`J$D       ReDim Preserve in_flist(fCount-1)