RPC Photonics扩散片BSDF
摘要: 1y/_D$~ZO (%`R{Y RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 ^Q)&lxlxpx irg%n 背景: zkFx2(Hq-f Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 {+n0t1 FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 W<W5ih,#
图1. RPC Photonics工程漫射体结构及光束投射形状 XeGtge/}T gO{XD.s 5e> <i 步骤 }3{ x G+, v/\in'H~ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ^U[c:Rz eiiI Wr_7
图2. RPC Photonics工程漫射体不同类型的散射数据 8SJi~gV 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) +7HM7cw 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 >^<%9{ 例如下所示: 0vu$dxb[ Sample name: EDF-C1-56 3%"r%:fQB/ Merging data from file EDF-C1-56 0-0.txt ^xB=d S~ Finished merging RPC data for sample EDF-C1-56 FZUN*5` FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt u0Nag=cU 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 r`t|}m a. 创建一个新的散射库 vMDX b. 散射模型命名 _trF /U< c. 改变散射模型为“Tabulated BSDF”. 85QVj] nr 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 ) ,-55*Rb i 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。 H<gC{:S 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, 8&gr}r-
5 g. 点击OK @k"Q e&BQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;QRnZqSv "4 Lt:o4x , [V#o-Z 脚本代码: ( !K?^si Xm#E9 9 '#Language "WWB-COM" YlF<S49loC :n@j"-HA Option Explicit A7|CG[wZ 5x([fG Sub Main gj\'1(Ju &}YJ"o[I 'Cleanup ~E]ct F ClearOutputWindow() !9w;2Z]uum Jp'XZ]o\ Print "Merging RPC Photonics BSDF Data Files" \]@XY_21 SetTextColor(255,0,0) yu<'-)T.? Print "Note: Script should be located in the same folder as the BSDF TXT files." `|{6U"n Print "Note: Do not run this script multiple times without deleting the output file between executions." X {["4 SetTextColor(0,0,0) ]8Eci^i ^oL43#Nlo 'Current directory of this script (should be the same as the text files being merged) R{GT?
wl Dim cDir As String `PV+.V} cDir = MacroDir$ & "\" 47GL[ofY %[l*:05 'Array which will be populated with the list of files to be merged V*$(T t( Dim fList() As String, curFile As String ?Re6oLm<B GetFileList( cDir, fList ) zOkIPv52~ S:\a&+og Print "" j@j%)CCM Print "Files found for merging:" 6m=FWw3y For Each curFile In fList dBB;dN Print Chr(9) & curFile AGH7z Next d]kP@flOV \`nRgYSE 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. )]\?Yyg] Dim nameArray() As String, sampName As String =p1aF/1$I nameArray = Split(fList(0)," 0-0.txt") # 1S*}Q<k sampName = nameArray(0) c*5y8k Print "" ftL>oOz[ Print "Sample name: " & Chr(9) & sampName BW`)q/ vP_V%5~yN 'Open an output file and write the FRED header data rh8.kW-K_ Dim outFile As String tt|v opz outFile = cDir & sampName & "_FRED.txt" `]+-z+ Open outFile For Output As #1 [RZ}9`V Print #1, "type bsdf_data" )Mtw9[ Print #1, "format angles=deg bsdf=value scale=1" o(2tRDT\_b wFgL\[$^| 'Loop the file list, skip the two header lines and write the remaining data to file Q%seV<!/ Dim lineArray() As String, curLine As Long Up(Jw-. For Each curFile In fList Z5oX "Yx Print "Merging data from file " & curFile sRM3G]nUr ReadFile( cDir & curFile, lineArray ) <`'^rCWI? For curLine = 2 To UBound(lineArray) BQs~>}(V Print #1, lineArray(curLine) "Yk3K^`1T. Next @YH<Hc Next EB/.M+~a qtx5N)J6 'Close the output file z%F68f73 Close #1 uSAb #ny&bJj Print "Finished merging RPC data for sample " & sampName 6{XdLI Print "FRED formatted data file: " & Chr(9) & outFile SS4'yaQ End Sub +npcU:(Kg ) <lpI';T 'Utility function to read the contents of a file into an array of strings. ;[)t*yAh Function ReadFile(ByVal fileName As String, _ vPVA^UPNV ByRef lineArray() As String) As Long :sMc}k?9S %
d%KH9u ReadFile = -1 :6,qp?/ Dim oFSO As Object 208 dr*6U Set oFSO = CreateObject("Scripting.FileSystemObject") 7\BGeI Erase lineArray ]^='aQ L4)@lmd3 Dim fid As Long AYC22( If oFSO.fileexists( fileName ) Then Kg#5
@; fid = FreeFile() 0(uNFyIG Open fileName For Input As fid R*C lineArray = Split(Input(LOF(fid), fid), vbCrLf) WIe2j Close fid tRqg')y End If Jb~nu Set oFSO = Nothing )u. ut8![T Return UBound( lineArray ) $] js0)> Dn[iA~ End Function W6Os|z9&| :&]THUw Sub GetFileList( ByVal in_dir As String, _ WsA(8Ck< ByRef in_flist() As String ) 8a\
Pjk ~}SOd<n)| 'Redimension the file list array :QSCky*i Erase in_flist C,+Sv- aZe[Nos 'Tracks how many files are found bS0z\!1 Dim fCount As Long bdn{Y fCount = 0 IZ2c<B5& Lv;R8^n 'Recurse directory and search for text files Cq7EdK;x Dim f As String >5i(U_`l f = Dir$(in_dir & "*.txt") ] -6=+\]
While f <> "" zuWfR&U|W ReDim Preserve in_flist(fCount) $X.X_ in_flist(fCount) = f ~%6GF57gC fCount += 1 KUC (n! f = Dir$() :Sh> Wend QfI)+pf ReDim Preserve in_flist(fCount-1) &ZjQa.-U> i;1EXM End Sub %"R|tlG
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