RPC Photonics扩散片BSDF

4A`NJ   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

$3+PbYY   摘要： &sVvWNO#2   { >{B`e`$   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。 7\ SUr9[   ~q +[<xR\   背景： }A$WO{2   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。 w RNroQ   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 3B0lb"e   4IdT'   i=FQGWAUu   >n5:1.g   步骤 2i#Sn'1   _#$9 y1bd   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。 0Sl]!PZR1   图2. RPC Photonics工程漫射体不同类型的散射数据 YMpf+kN   =;~I_)Pg1   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） >ndJNinV   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 uv{P,]lK   例如下所示： =8G&3 R   Sample name:  EDF-C1-56 wYsZM/lw   Merging data from file EDF-C1-56 0-0.txt tS# `.F~y   Finished merging RPC data for sample EDF-C1-56 i@"e,7mSG   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5__+_hO ;3   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 |Yi)"-   a. 创建一个新的散射库 /x@RNdKv   b. 散射模型命名 iGXI6`F"   c. 改变散射模型为“Tabulated BSDF”. T".]m7!   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 ） /BKe+]dS*   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。 9|' B9C   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， 8U2dcx:G3   g. 点击OK ZsP2>%"   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 )YW<" $s   :Gqy>)CxX   DLE8+NV8    脚本代码： iyx>q!P   e=P   '#Language "WWB-COM" ~o3Hdd_#}N   }7<5hn E   Option Explicit lw%?z/HDf   ihL/n   Sub Main "GT4s?6O   qf'm=efRyu       'Cleanup =x#FbvV       ClearOutputWindow() JM$.O;y -   j{VGClb=T       Print "Merging RPC Photonics BSDF Data Files" Weoj|0|t       SetTextColor(255,0,0) 1tzV 8(7       Print "Note: Script should be located in the same folder as the BSDF TXT files." ;_kzcK!l       Print "Note: Do not run this script multiple times without deleting the output file between executions." rk2xKm^w       SetTextColor(0,0,0) |Q~cX!;   HYr}wG       'Current directory of this script (should be the same as the text files being merged) p(SRjQt       Dim cDir As String c2l_$p       cDir = MacroDir$ & "\" H2gj=krK   $Byj}^;1       'Array which will be populated with the list of files to be merged =64r:E       Dim fList() As String, curFile As String UAS@R`? cI       GetFileList( cDir, fList ) T4e\0.If   B=L&bx       Print "" Q } k.JS~#       Print "Files found for merging:" ~iBgw&Y       For Each curFile In fList c{ZY,C&<           Print Chr(9) & curFile ~Z/ ^c,[:       Next ".*x!l0y7   V5}nOGV9       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Zx }&c |Q       Dim nameArray() As String, sampName As String "e3["'       nameArray = Split(fList(0)," 0-0.txt") Myat{OF       sampName  = nameArray(0) f}c\ _}(       Print "" gE/Tj$       Print "Sample name: " & Chr(9) & sampName ;.sl*q1A   4o:hyh        'Open an output file and write the FRED header data FX<b:#       Dim outFile As String Wx'Kp+9'       outFile = cDir & sampName & "_FRED.txt" p4>$z& _       Open outFile For Output As #1 u),Qa=Wp       Print #1, "type bsdf_data" A?Qa 4i       Print #1, "format angles=deg bsdf=value scale=1" Ey{%XR+*;   l7(!`NPbC       'Loop the file list, skip the two header lines and write the remaining data to file $S*4r&8ZD       Dim lineArray() As String, curLine As Long iJFs0?*       For Each curFile In fList :m=m}3/:           Print "Merging data from file " & curFile _;A $C(           ReadFile( cDir & curFile, lineArray ) `pZs T ^G[           For curLine = 2 To UBound(lineArray) /76 1o\Q               Print #1, lineArray(curLine) V+-$jOh           Next aFiCZHohw       Next ek aFN\   NBh%:tu7M       'Close the output file TfxwVPX       Close #1 !;@_VWR   h<l1]h+x       Print "Finished merging RPC data for sample " & sampName t-u|U(n       Print "FRED formatted data file: " & Chr(9) & outFile 3LR p2(A   End Sub a>4uiFiv   9_ICNG%   'Utility function to read the contents of a file into an array of strings. :R6 bq!   Function ReadFile(ByVal fileName As String, _  c9''                     ByRef lineArray() As String) As Long +YOKA*   kpwt]]e*       ReadFile = -1 4W4kwU6D       Dim oFSO As Object $m1<i?'m       Set oFSO = CreateObject("Scripting.FileSystemObject") 1RLY $M       Erase lineArray <O?y-$~   6TWWlU^e       Dim fid As Long AEmNHO@%q       If oFSO.fileexists( fileName ) Then HWns.[           fid = FreeFile() <HWS:'1           Open fileName For Input As fid S,fCV~Cio?           lineArray = Split(Input(LOF(fid), fid), vbCrLf) T&Xl'=/           Close fid |XY En7^r       End If y #f QPR       Set oFSO = Nothing =M6[URZ       Return UBound( lineArray ) Z!d7&T}   ?B@;QjhjiJ   End Function q:>^ "P{   -${DW^txMZ   Sub GetFileList( ByVal in_dir As String, _ 9DQ)cy                    ByRef in_flist() As String ) Op.8a`XLt&   D\~zS`}       'Redimension the file list array c97{Pu       Erase in_flist uxn)R#?   )'4P.>!!aQ       'Tracks how many files are found Zt -1h{7       Dim fCount As Long Mvj;ic6iK       fCount = 0 lA!"z~03*   oq/G`{`\       'Recurse directory and search for text files XKL3RMF9r       Dim f As String M`,~ mU       f = Dir$(in_dir & "*.txt") u*S=[dq       While f <> "" .%BT,$1K           ReDim Preserve in_flist(fCount) # M,  7           in_flist(fCount) = f !"Yj|Nu6           fCount += 1 h!@|RW&}qX           f = Dir$() 0X8t>#uF       Wend k;PA h>8       ReDim Preserve in_flist(fCount-1)