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摘要: |0p'p$% S
'+"+%^tj RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 :X*LlN [bJnl>A 背景: MDt?7c Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 P^W47
SO FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 tb3fz")UC 图1. RPC Photonics工程漫射体结构及光束投射形状 yG$@!*| ;(6lN<iU 4'&BpFDUb 步骤 _Qc\v0% vI}S6-"< 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。 8-YrmP2k v"~I( kf$ 图2. RPC Photonics工程漫射体不同类型的散射数据 y: [] + 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) 4+,Z'J%\[7 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 ! -@!u 例如下所示: va2A@U Sample name: EDF-C1-56 J?fh3RW9 Merging data from file EDF-C1-56 0-0.txt E,yK` mPp^ Finished merging RPC data for sample EDF-C1-56 (OQ
@!R& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt q.{/{9 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 \w[%n 0 a. 创建一个新的散射库
m]q!y3 b. 散射模型命名 2tm-:CPG c. 改变散射模型为“Tabulated BSDF”. \zL7j4 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 ) N\p]+[6 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。 v=-3 ,C 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, ,s&~U<Z g. 点击OK
w{EU9C 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #q.G_-H4J@ 2!?z%s-S #2ASzCe 脚本代码: ld:alEo z
]N~_9w '#Language "WWB-COM" KXCmCn
K/m)f# Option Explicit 3eP0v Kg-X]yu*0 Sub Main L b;vrh;A E9 q;>)} 'Cleanup }(EOQ2TI ClearOutputWindow() dU^<7 K:S g_c)Ts( Print "Merging RPC Photonics BSDF Data Files" \&)W#8V SetTextColor(255,0,0) `h5eej&s( Print "Note: Script should be located in the same folder as the BSDF TXT files." JM lhBh Print "Note: Do not run this script multiple times without deleting the output file between executions." Er1u1@ SetTextColor(0,0,0) ~7WXjVZ >1I2R/' 'Current directory of this script (should be the same as the text files being merged) HKN"$(Q Dim cDir As String e`M]ZGrr cDir = MacroDir$ & "\" UZXcKl>u kS#DKo 'Array which will be populated with the list of files to be merged RTBBb:eX Dim fList() As String, curFile As String B00wcYM<1r GetFileList( cDir, fList ) `G0rF\[ &dDI*v+ Print "" Zbh]SF{3F Print "Files found for merging:" 3b\8907 For Each curFile In fList 1za'u_ Print Chr(9) & curFile yZ)aKwj%U Next ]N <] 1(7.V-(G 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. aevG<|qP Dim nameArray() As String, sampName As String >VUQTg nameArray = Split(fList(0)," 0-0.txt") 7h#faOP sampName = nameArray(0) V0
+k3H Print "" 3kqV_Pjg Print "Sample name: " & Chr(9) & sampName &DQ4=/Z K#f`_SCW 'Open an output file and write the FRED header data +[8Kl=]L Dim outFile As String ~73i^3yf outFile = cDir & sampName & "_FRED.txt" '}pgUh_ Open outFile For Output As #1 0"qim0%|DF Print #1, "type bsdf_data" 0Q-
Mxcj Print #1, "format angles=deg bsdf=value scale=1" OWXye4`* 6SBvn% 'Loop the file list, skip the two header lines and write the remaining data to file H@2"ove-uC Dim lineArray() As String, curLine As Long Ma=6kX] For Each curFile In fList tGO[A#9a Print "Merging data from file " & curFile Ie&b<k ReadFile( cDir & curFile, lineArray ) feI[M;7u For curLine = 2 To UBound(lineArray) +>WC^s Print #1, lineArray(curLine) JQ/t, v$G Next j*La,iF Next S|q!? /jqj &e]]F# 'Close the output file 2~&hstd% Close #1 9oz (=R qM1)3.)[: Print "Finished merging RPC data for sample " & sampName 60aKT:KLC_ Print "FRED formatted data file: " & Chr(9) & outFile &I}T<v{f End Sub "?eH=! [71#@^ye 'Utility function to read the contents of a file into an array of strings. jq("D, Function ReadFile(ByVal fileName As String, _ FSU%?PxO ByRef lineArray() As String) As Long )}Rfa}MD P7wqZ? ReadFile = -1 wsJ%*
eYf Dim oFSO As Object 7moElh v Set oFSO = CreateObject("Scripting.FileSystemObject") ^?s~Fk_V Erase lineArray TXJY2J*24 m/<F 5R Dim fid As Long u
JQaHL! If oFSO.fileexists( fileName ) Then iJZ|[jEDV fid = FreeFile() Kl aZZJ Open fileName For Input As fid .A*VLF*m lineArray = Split(Input(LOF(fid), fid), vbCrLf) zD)IU_GWa Close fid ckf<N9 End If KZrMf77= Set oFSO = Nothing $W/+nmb)@K Return UBound( lineArray ) p]h*6nH>~ o=-Vt,2{ End Function $h 08Z xBL$]> Sub GetFileList( ByVal in_dir As String, _ Tf#2"(! ByRef in_flist() As String ) H}sS4[z c/<Sa|' 'Redimension the file list array bB:r]*_
s] Erase in_flist -Wlp=#9 crJ7pe9 'Tracks how many files are found e8AjO$49 Dim fCount As Long Xq,UV fCount = 0 M[YTk=IM# JO2ZS6k[ 'Recurse directory and search for text files =f4[=C$&` Dim f As String
':4}O# f = Dir$(in_dir & "*.txt") cBLR#Yu;O5 While f <> "" %NT`C9][ ReDim Preserve in_flist(fCount) OU,PO2xX9 in_flist(fCount) = f n5Nan
fCount += 1 aNE9LAms f = Dir$() 3XeXzPj Wend 4<G? ReDim Preserve in_flist(fCount-1) *xE"8pN/ m]FaEQVoE End Sub .D8~)ZWN I 1 b 1B)Y;hg6& QQ:2987619807 H96BqNoO
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