RPC Photonics扩散片BSDF

Cy;UyZ   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

.ck?JXg   摘要： aZmN(AJ8v   ~[%CUc"   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。 E=8'!   j* .;6}\o   背景： %B$ftsYXmu   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 Ev7.!   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 F rckA   |&#N&t   tpJA~!mG3   ?%6oM   步骤 DPI[~   kOydh(yE   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 "Vp nr +6   图2. RPC Photonics工程漫射体不同类型的散射数据 :r*hY$v   JN wI{   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） ng%[yY   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 eh9?GUr5   例如下所示： ^\}qq>_   Sample name:  EDF-C1-56 ^+>*Y=fl   Merging data from file EDF-C1-56 0-0.txt 'n'>+W:   Finished merging RPC data for sample EDF-C1-56 aKj|gwo!   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt NxHUOPAJc   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 vG _R( ]d   a. 创建一个新的散射库 wKM9fs   b. 散射模型命名 p":u]Xgb   c. 改变散射模型为“Tabulated BSDF”. MJGT|u8O&   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 ） 99=~vNn   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。 !UoA6C:   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， gv`_+E{P   g. 点击OK le/j!   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 p~w ] ~\   'gf[Wjb,%   'ZF6Z9   脚本代码： Tw-NIT)   1$0Kvvg[   '#Language "WWB-COM" ce;7   GQbr}xX.#   Option Explicit =o9s?vOJ   I-R7+o   Sub Main !8G)`'   uyYV_Q0~;       'Cleanup V}s/knd       ClearOutputWindow() M_E,pg=rWI   :+"4_f0       Print "Merging RPC Photonics BSDF Data Files" B/4M;G~       SetTextColor(255,0,0) YZf{."Opj[       Print "Note: Script should be located in the same folder as the BSDF TXT files." ,iy y2       Print "Note: Do not run this script multiple times without deleting the output file between executions." Al^tM0T^       SetTextColor(0,0,0) c]M+|R5   F=qILwd       'Current directory of this script (should be the same as the text files being merged) __g?xw       Dim cDir As String 8Yq06o38C       cDir = MacroDir$ & "\" hi"C<b.   D)PX|xrn       'Array which will be populated with the list of files to be merged =2 HY]H       Dim fList() As String, curFile As String m \)B=H!bz       GetFileList( cDir, fList ) in1rDN%Vi   FDl/7P`b(       Print "" {]dxFhe)       Print "Files found for merging:" 4;YP\{u       For Each curFile In fList 5sJ>+Rg           Print Chr(9) & curFile ZH Q?{ "       Next *HD(\;i-$   q9 vND[BQ       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. q1VKoKb6\:       Dim nameArray() As String, sampName As String +v B}E       nameArray = Split(fList(0)," 0-0.txt") RnH?95n?{       sampName  = nameArray(0) L/u|90)L       Print "" d#T5=5#       Print "Sample name: " & Chr(9) & sampName No7-fX1B   J2 Dn       'Open an output file and write the FRED header data s&E,$|80       Dim outFile As String 0cmd +`       outFile = cDir & sampName & "_FRED.txt" A"7YkOfwH       Open outFile For Output As #1 5ngs1ZF@       Print #1, "type bsdf_data" ?6_]^:s       Print #1, "format angles=deg bsdf=value scale=1" =aVvv+T   |5vJ:'`I       'Loop the file list, skip the two header lines and write the remaining data to file &oG>Rqkm       Dim lineArray() As String, curLine As Long k1z`92"       For Each curFile In fList " bej#'M#           Print "Merging data from file " & curFile 5~h)pt47           ReadFile( cDir & curFile, lineArray ) v\w*VCjoV           For curLine = 2 To UBound(lineArray) zLl-{Kk               Print #1, lineArray(curLine) vl/!w2           Next *<^C0:i(       Next X4o#kW   (A?>U_@       'Close the output file __}SHU0R       Close #1 gxO~44"   {gzQ/|}#z-       Print "Finished merging RPC data for sample " & sampName ' wl})       Print "FRED formatted data file: " & Chr(9) & outFile %i \rw*f   End Sub M %,\2!$   bVcJ/+Yx|   'Utility function to read the contents of a file into an array of strings. uRy}HLZ"   Function ReadFile(ByVal fileName As String, _ a?W5~?\9                     ByRef lineArray() As String) As Long '_?Z{|   ZW;Ec+n_K       ReadFile = -1 QP(d77n       Dim oFSO As Object vEx'~_+a9       Set oFSO = CreateObject("Scripting.FileSystemObject") 4]1/{</B|       Erase lineArray KOg,V_(I   ll5;09       Dim fid As Long IS8 sJ6")       If oFSO.fileexists( fileName ) Then Vn_&q6Pa           fid = FreeFile() -+){;,           Open fileName For Input As fid }h1BAKg           lineArray = Split(Input(LOF(fid), fid), vbCrLf) \L >XF'o           Close fid 6KGT?d       End If D<v< :       Set oFSO = Nothing 3sV$#l P       Return UBound( lineArray ) W)1nc"WqY   iJOoO"Ai   End Function ;8#6da,   N]yT/8   Sub GetFileList( ByVal in_dir As String, _ ;jxX/c                    ByRef in_flist() As String ) lfBCzxifC   r~=+>, _       'Redimension the file list array G>pedE\       Erase in_flist ?n<F?~   *ssw`}yE'       'Tracks how many files are found UZ/LR       Dim fCount As Long G!`%.tH       fCount = 0 HCr}|DxyK   O4`.ohAZ       'Recurse directory and search for text files 6\l F       Dim f As String y:\<FLR}j       f = Dir$(in_dir & "*.txt") Eet/l]e#a       While f <> "" ();Z,A           ReDim Preserve in_flist(fCount) #U0| j?!D           in_flist(fCount) = f e|C2/U-           fCount += 1 3T(ft^~           f = Dir$() >? o5AdZ       Wend b w1s?_P       ReDim Preserve in_flist(fCount-1)