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摘要: U9]&~jR 'ghwc:Og|% 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。 m?_@.O@] IM$I=5ye 背景: qS}pv Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 \\i$zRi 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。 Z&j?@k,k 图1. RPC Photonics工程漫射体结构及光束投射形状 f$p7L.d< VaLl$w 3P[u>xE 步骤 +U= !svE i8H!4l 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。 "R9^X3; &RbT& 图2. RPC Photonics工程漫射体不同类型的散射数据 F-I\x 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) 8@J5tFJ&% 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 to"[r 例如下所示: \(a!U,]LM Sample name: EDF-C1-56 ~u+|NtF Merging data from file EDF-C1-56 0-0.txt bf&k:.v'8 Finished merging RPC data for sample EDF-C1-56 h(Ccm44 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt os~}5QJ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 qk=0ovUzg a. 创建一个新的散射库 ?QfomTT b. 散射模型命名 Fl;!'1 c. 改变散射模型为“Tabulated BSDF”.
Jk3V]u 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 ) =as\Tp#d 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。 SdOE^_@: 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, Imm|5-qJ g. 点击OK R4P$zB_<2 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3PU'd^ aB+B1YdY" h&$,mbEoI 脚本代码: `p{,C`g,R $dgez#TPL '#Language "WWB-COM" K`% I!Br AiE\PMF~{P Option Explicit HG)c\b Pu7cL Sub Main h`HdM58CQ .7Lv 'Cleanup vspub^;5\ ClearOutputWindow() SP
|R4*KY cgvD>VUw Print "Merging RPC Photonics BSDF Data Files" ?B`Yq\L) SetTextColor(255,0,0) zgR@-OtFZ Print "Note: Script should be located in the same folder as the BSDF TXT files." m"RE[dQ Print "Note: Do not run this script multiple times without deleting the output file between executions." !ii'hwFm$ SetTextColor(0,0,0) >W[#-jA_Z mbm|~UwD 'Current directory of this script (should be the same as the text files being merged) )ls<"WTC. Dim cDir As String ^S'tMT_ cDir = MacroDir$ & "\" WCPl}7> A}cGag+sp 'Array which will be populated with the list of files to be merged WJN}d-S=^ Dim fList() As String, curFile As String uRu)iBd D GetFileList( cDir, fList ) zLHE; N>J"^ GX Print "" >4lT0~V/ Print "Files found for merging:" zkrcsc\Z~0 For Each curFile In fList wRi` L7 Print Chr(9) & curFile .0zNt Next ;
3WA-nn xjDV1Xf* 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. =z$XqT.' Dim nameArray() As String, sampName As String &QL!Y{=Y6 nameArray = Split(fList(0)," 0-0.txt") 8x J]K sampName = nameArray(0) @xI:ZtM Print "" A/4HR] Print "Sample name: " & Chr(9) & sampName 5V{zdS= CL-mt5Kx#7 'Open an output file and write the FRED header data +Eh^j3W Dim outFile As String 7~V,=WEe outFile = cDir & sampName & "_FRED.txt" *4tJ|m6"Y6 Open outFile For Output As #1 )KLsa`RV: Print #1, "type bsdf_data" `=h`:` Print #1, "format angles=deg bsdf=value scale=1" iS"( &
M wvj 'Loop the file list, skip the two header lines and write the remaining data to file bf3Njma% Dim lineArray() As String, curLine As Long k'K&GF1B For Each curFile In fList Z $? Ql@M Print "Merging data from file " & curFile %EooGHGF? ReadFile( cDir & curFile, lineArray ) {G
D<s)) For curLine = 2 To UBound(lineArray) 7.o:(P1??g Print #1, lineArray(curLine) V~uH)IMkh7 Next domaD"C Next PmGW\E[ni SOI$Mx 'Close the output file >7VOytc Close #1 c_fx,;
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1px8af] Print "Finished merging RPC data for sample " & sampName ZO2$Aan Print "FRED formatted data file: " & Chr(9) & outFile `KgWaf- End Sub Qw ukhD7 9;^ r 'Utility function to read the contents of a file into an array of strings. 4Em mh=A Function ReadFile(ByVal fileName As String, _ y0d a8sd) ByRef lineArray() As String) As Long %U&O
\GB 3YG[~o|4 ReadFile = -1 RN1q/H| Dim oFSO As Object ?Sq?f? Set oFSO = CreateObject("Scripting.FileSystemObject") 6_m5%c~;+r Erase lineArray }jQxwi) hy"O_Le Dim fid As Long <#s=78
g.3 If oFSO.fileexists( fileName ) Then * ?a-m\ fid = FreeFile() cViEvS r Open fileName For Input As fid 9U_uw
Rv2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) \G?GX Close fid xm}9(EJ End If (RR:{4I Set oFSO = Nothing G/nSF:r p Return UBound( lineArray ) :@:i*2= |&+0Tg~ZE End Function ,m-z D :Rh?#yO5 Sub GetFileList( ByVal in_dir As String, _ F_9e ju^| ByRef in_flist() As String ) 6q[|U_3I@ 0UEEvD5 'Redimension the file list array [i18$q5D Erase in_flist qn VxP& %T hY6y( 'Tracks how many files are found >~-8RM Dim fCount As Long 2NHkK_B1P fCount = 0 wo($7'.@
e6C;A]T2E 'Recurse directory and search for text files v=A]#O% Dim f As String ^tS{a *Yn f = Dir$(in_dir & "*.txt") )~{T While f <> "" O,`#h*{N ReDim Preserve in_flist(fCount) 'u6T^Y S in_flist(fCount) = f w-%V9]J1 fCount += 1 Y40`~ f = Dir$() =.=4P~T& Wend "@1e0`n
Q ReDim Preserve in_flist(fCount-1) ^gb3DNV~y "|?zQ?E End Sub 9`P<|(
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