RPC Photonics扩散片BSDF
摘要: 0](V@F"~ (1)b> 6 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。 9
!V,++j /}nq?Vf 背景: ~9c jc 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。 Q; BD|95nl 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。 )p[Qj58
图1. RPC Photonics工程漫射体结构及光束投射形状 yZ,S$tSR `_(N(dm ]~4*ak=)5\ 步骤 zin'&G>l cpM]APF- 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。 5EL&?\e ,soXX_Y>
图2. RPC Photonics工程漫射体不同类型的散射数据 kg^5D3!2{Q 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) UD^=@?^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 [uFv_G{H 例如下所示: + De-U. Sample name: EDF-C1-56 R_b)2FU1y Merging data from file EDF-C1-56 0-0.txt F **/T Finished merging RPC data for sample EDF-C1-56 '3
JVUHn FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt M>u84|` 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 %9_jF" a. 创建一个新的散射库 k]S`A,~ b. 散射模型命名 r=<1*u c. 改变散射模型为“Tabulated BSDF”. 8r48+_y3u 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 ) 9eEA80i7 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。 na3lbwq 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, ;upYam" g. 点击OK +HoCG;C{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GP_%.fO\M bRI `ZT0 7A{,)Y/w ^ 脚本代码: $|7;(2k 8^hbS%s! '#Language "WWB-COM" O[z-K K< o(g}eP,g} Option Explicit ogG:Ai)90 *yN#q>1 Sub Main +d=8 /3O% |] ]Rp 'Cleanup 2E@g#:3 ClearOutputWindow() ;;mr?'R ?F9c6 $| Print "Merging RPC Photonics BSDF Data Files" N`+@_.iBX SetTextColor(255,0,0) FH7l6b,^ Print "Note: Script should be located in the same folder as the BSDF TXT files." `]5 t'Ps Print "Note: Do not run this script multiple times without deleting the output file between executions." iy [W:<c7j SetTextColor(0,0,0) ]~\%ANoi X9o6} %Y 'Current directory of this script (should be the same as the text files being merged) ,9~qLQ0O Dim cDir As String UGQHwz cDir = MacroDir$ & "\" \8/$ZEom XF`?5G~~# 'Array which will be populated with the list of files to be merged GyGF<%nq Dim fList() As String, curFile As String h:4F?'W GetFileList( cDir, fList ) a4Y43 n c='uyx Print "" ~U1M-<IX Print "Files found for merging:" ~[:C l For Each curFile In fList N==Y]Z$G Print Chr(9) & curFile $8fJ DN Next =[YjIWr#o iV.j!H7o 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. !%>(O@~"| Dim nameArray() As String, sampName As String CB>*(Mu nameArray = Split(fList(0)," 0-0.txt") 1U8/.x| sampName = nameArray(0) b.QL\$a
& Print "" Y#rd'
8 Print "Sample name: " & Chr(9) & sampName R&MetQ~-{ U\(T<WX, 'Open an output file and write the FRED header data |[MtUWEW Dim outFile As String uex([;y outFile = cDir & sampName & "_FRED.txt" oC|']r6 Open outFile For Output As #1 MmD1@fW32# Print #1, "type bsdf_data" Df=Xbf>jt9 Print #1, "format angles=deg bsdf=value scale=1" 8GT4U5c
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6 :7 'Loop the file list, skip the two header lines and write the remaining data to file u*8x.UE8C0 Dim lineArray() As String, curLine As Long LmjGU[L,@ For Each curFile In fList 5k`Df/ Print "Merging data from file " & curFile ZW`wA2R0
ReadFile( cDir & curFile, lineArray ) b}Wm-]|+ For curLine = 2 To UBound(lineArray) Gr!@ih^ Print #1, lineArray(curLine) UI74RP Next Z1R{'@Y0Z Next |J&=h|-A . 12H/F 'Close the output file KvtJtql; Close #1 }cERCS\t %KW NY(m Print "Finished merging RPC data for sample " & sampName 0;2ApYks Print "FRED formatted data file: " & Chr(9) & outFile P/T`q:<H End Sub QI6=[
c>L#(D\\ 'Utility function to read the contents of a file into an array of strings. @T&w
nk Function ReadFile(ByVal fileName As String, _ <E\vc6n ByRef lineArray() As String) As Long $B?IE#7S4 m" c6^)U ReadFile = -1 TQ25"bWi Dim oFSO As Object :djbZ>< Set oFSO = CreateObject("Scripting.FileSystemObject") i} ?\K>BWq Erase lineArray 1|oE3 -Rj3cx Dim fid As Long betTAbF If oFSO.fileexists( fileName ) Then h?-M+Ac fid = FreeFile() Z2&7HTz Open fileName For Input As fid /9SNXjfbt lineArray = Split(Input(LOF(fid), fid), vbCrLf) GLa_[9 " Close fid 5 IFc" End If &f<Ltdw Set oFSO = Nothing Y&1Yc)*O Return UBound( lineArray ) * a@78&N z9ZS&=> End Function xH{V.n&v !c=EB`<* Sub GetFileList( ByVal in_dir As String, _ gwN
y]! ByRef in_flist() As String ) lcuqzX{7 dW#?{n-H< 'Redimension the file list array Y!3i3D Erase in_flist LqoH]AcN 15"[MX A 'Tracks how many files are found F{F SmUxzK Dim fCount As Long xZ>@wBQ fCount = 0 ]QmY`pTB` b%|6y 'Recurse directory and search for text files %p
tw=Ju Dim f As String ms/Q- f = Dir$(in_dir & "*.txt") \vp^[,SI While f <> "" )C%S`d<%, ReDim Preserve in_flist(fCount) ANXN.V in_flist(fCount) = f okLheF fCount += 1 Y$nI9 f = Dir$() z-;yDB:~t Wend o`7B@] ReDim Preserve in_flist(fCount-1) {z7kW@c xQ\S!py- End Sub y+P$}Nru yI8
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