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摘要: wsEOcaie d2U+%%Tdw 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。 L:_GpZ_ WdZ_^ 背景: 9-"!v0[' 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。 V]5MIiNl 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。 $V\Dl]a1 图1. RPC Photonics工程漫射体结构及光束投射形状 >n"4M~I Aryp!oW rX}FhBl5 步骤 ^:u-wr8?{ EpCF/i?9: 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 5kik+ `Fx+HIng, 图2. RPC Photonics工程漫射体不同类型的散射数据 QX+Xi<YE- 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) X#<+D1P 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 ufn%sA 例如下所示: t\XA
JU Sample name: EDF-C1-56 AaLbJYuKd Merging data from file EDF-C1-56 0-0.txt ZKTY1JW_ Finished merging RPC data for sample EDF-C1-56 [:gp_Z& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt MS`XhFPS. 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cb5T-'hY
a. 创建一个新的散射库 `rest_vu b. 散射模型命名 _A~>?gJ;, c. 改变散射模型为“Tabulated BSDF”. O<P(UT" d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ):]5WHYg e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 x8o/m$[,=u 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, /d*[za'0 g. 点击OK )8`i%2i= 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f7b6!R;z_ 6&;h+;h ( _3QZ 脚本代码: m Eg3.| U'LPaf$O '#Language "WWB-COM" jx#9
69S*\'L Option Explicit Q%:Z&lgy INEE
37% Sub Main 5VSc5*[ (tCBbPW6T? 'Cleanup wlFK#iK ClearOutputWindow() FA{'Ki` :7?n)=Tx Print "Merging RPC Photonics BSDF Data Files" "^oU&]KQJ SetTextColor(255,0,0) X#o<)) Print "Note: Script should be located in the same folder as the BSDF TXT files." }ag;yf; Print "Note: Do not run this script multiple times without deleting the output file between executions." 9\VV++}s>o SetTextColor(0,0,0) Oe21noL i1 c[Gk.o 'Current directory of this script (should be the same as the text files being merged) QIfP%,LT Dim cDir As String aA]wFZ cDir = MacroDir$ & "\" Pa'N)s< XZ<8M}Lg 'Array which will be populated with the list of files to be merged b%].D(qBy Dim fList() As String, curFile As String \c1>15 GetFileList( cDir, fList ) v0( _4U]/ 8p#V4liE Print "" (6i4N2 Print "Files found for merging:" =@D H hg For Each curFile In fList b!qlucAeE Print Chr(9) & curFile _BoA&Ism Next 9&zQ5L>
i (`Q{l 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. p}e| E! Dim nameArray() As String, sampName As String j_.tg7X nameArray = Split(fList(0)," 0-0.txt") TQykXZ2Yb) sampName = nameArray(0) ,<$rSvMfg Print "" g"N&*V2 Print "Sample name: " & Chr(9) & sampName P('bnDU nG$+9}\UlP 'Open an output file and write the FRED header data c`/kx Dim outFile As String *xN?5u% outFile = cDir & sampName & "_FRED.txt" to?={@$] Open outFile For Output As #1 p*l=rni4 Print #1, "type bsdf_data" F_&H*kL L3 Print #1, "format angles=deg bsdf=value scale=1" LfJMSscfv G[=;519 'Loop the file list, skip the two header lines and write the remaining data to file dM-~Qo Dim lineArray() As String, curLine As Long hcz!f For Each curFile In fList Rq`5ff3, Print "Merging data from file " & curFile j
Y(|z*| ReadFile( cDir & curFile, lineArray ) )2
b-3lz For curLine = 2 To UBound(lineArray) E)|Bl> Print #1, lineArray(curLine) e-nwR Next y,K> Wb9e Next I|Mw*2U _YN
C}PUU 'Close the output file (C.aQ)|T Close #1 :m36{# `NNP}O2 Print "Finished merging RPC data for sample " & sampName %r&36d' Print "FRED formatted data file: " & Chr(9) & outFile 2cwJ);Eg2 End Sub Ya-GDB;L Qjd]BX; 'Utility function to read the contents of a file into an array of strings. "bz.nE* Function ReadFile(ByVal fileName As String, _ "N)InPR- ByRef lineArray() As String) As Long -C8LM ls )@<HG$# ReadFile = -1 0<##8m@F8 Dim oFSO As Object ZG?e% Set oFSO = CreateObject("Scripting.FileSystemObject") ],{M``]q Erase lineArray cC]]H&'Hg+ NErvX/qK Dim fid As Long P.jy7:dB, If oFSO.fileexists( fileName ) Then Wz#ZkNO fid = FreeFile() Ec^2tx"= Open fileName For Input As fid P76gJ@#m lineArray = Split(Input(LOF(fid), fid), vbCrLf) >qUD_U3A Close fid "rVM23@
tq End If &*oljGt8 Set oFSO = Nothing xe9\5Gb} Return UBound( lineArray ) }h* j{b, SjIDzNI5 End Function I}m>t}QRI_ `R!2N4|; Sub GetFileList( ByVal in_dir As String, _ Ocz21gl-?` ByRef in_flist() As String ) nU 0## Qz"//=hC|H 'Redimension the file list array Wys$#pJ Erase in_flist Kjpsz] ; tgHN\@yj 'Tracks how many files are found 5DO}&%.xt Dim fCount As Long %Aa_Bumf*: fCount = 0 qQ1D }c@ eu?P6>urA 'Recurse directory and search for text files O&}R Dim f As String T5}5uk9 f = Dir$(in_dir & "*.txt") t3C#$> While f <> "" ,Ek6X)|@ ReDim Preserve in_flist(fCount) %NfH`%` in_flist(fCount) = f ;F"Tu fCount += 1 .4[M-@4+] f = Dir$() ?}S!8;d Wend T'9M ReDim Preserve in_flist(fCount-1) "{3MXAFe /<dl"PWkJv End Sub :9(w~bB9$ .'4@Yp{= i8DYC=r QQ:2987619807 Q5u3~Q'e
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