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摘要: D=m'pL/pl J_x13EaV0 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。 }J">}j]/ p2Zo 背景: _8Kx6s% 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。 F
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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。 ?HF%(>M 图1. RPC Photonics工程漫射体结构及光束投射形状 u/cg|]x&T = C4 <:SZAAoIV 步骤 -gSUjP 35E _W>n 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。 h 3]wL.V %?e& WLS 图2. RPC Photonics工程漫射体不同类型的散射数据 At7>V-f} 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) Fa'k0/_j 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 *s9C!wYMZ 例如下所示: 0"CG7Vg,zh Sample name: EDF-C1-56 +qh[N@F Merging data from file EDF-C1-56 0-0.txt Ecd;<$tk Finished merging RPC data for sample EDF-C1-56 Hemq+]6^ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 1pArZzm> 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ='`/BY(m[ a. 创建一个新的散射库 {&jb5-*f b. 散射模型命名 IiY/(N+J c. 改变散射模型为“Tabulated BSDF”. #Q2Y&2`yGT 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 ) T:5fc2Ngv 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。 (M*FIX 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, cWoPB
_ g. 点击OK UK<Nj<-'t 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ZosP(Tdq /YZr~|65 c-B
cA 脚本代码: b )B?
F ee yHy"@ '#Language "WWB-COM" |&RU/ a rg^'S1x| Option Explicit 0g+'/+Ho 4 <YdE1{fm Sub Main 8_{X1bj /Mvf8v 'Cleanup .Y&)4+ckL ClearOutputWindow() a!=D [Gz*5 i\,-oO Print "Merging RPC Photonics BSDF Data Files" N@t|7~ SetTextColor(255,0,0) etTn_v Print "Note: Script should be located in the same folder as the BSDF TXT files." u6AA4( Print "Note: Do not run this script multiple times without deleting the output file between executions." $<}$DH_Y SetTextColor(0,0,0) \WxukYH vEJWFoeEFm 'Current directory of this script (should be the same as the text files being merged) wne,e's} Dim cDir As String JpXlBEio% cDir = MacroDir$ & "\" I}1NB3>^ '<"s \, 'Array which will be populated with the list of files to be merged 0yD9SJn Dim fList() As String, curFile As String <g"{Wv: h GetFileList( cDir, fList ) e )d`pQ6 &L=suDe Print "" Dfmjw Print "Files found for merging:" nAv#?1cjz For Each curFile In fList j0oR)du Print Chr(9) & curFile ?8'*,bK Next 'uBu6G h1de[q) 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3 2&;`]C Dim nameArray() As String, sampName As String ]n6#VTz* nameArray = Split(fList(0)," 0-0.txt") 8Vr%n2M sampName = nameArray(0) Y3Yz)T}UkS Print "" )Y"+,$$>Y` Print "Sample name: " & Chr(9) & sampName `sn^ysp pFOx>u2`a 'Open an output file and write the FRED header data 5IE#\FITO| Dim outFile As String Ayxkv)%:@) outFile = cDir & sampName & "_FRED.txt" *\
R ]NV Open outFile For Output As #1 !2%HhiB' Print #1, "type bsdf_data" 0XE4<U Print #1, "format angles=deg bsdf=value scale=1" Te"ioU?. GeH#I5y 'Loop the file list, skip the two header lines and write the remaining data to file bCRV\myd` Dim lineArray() As String, curLine As Long :D~D U,e' For Each curFile In fList KcWN,!G Print "Merging data from file " & curFile Va"0>KX ReadFile( cDir & curFile, lineArray ) d;boIP`M; For curLine = 2 To UBound(lineArray) TM%|'^) Print #1, lineArray(curLine) */`ki;\A Next (C\]-E> Next ]_f_w9] 0"<H;7K#W 'Close the output file &."iFe Close #1 P3x8UR=fS wr$("A( Print "Finished merging RPC data for sample " & sampName ?:Uv[|S#> Print "FRED formatted data file: " & Chr(9) & outFile 3lrT3a3vV End Sub 'j#*6xD dqU~`b9 'Utility function to read the contents of a file into an array of strings. "g5^_UP Function ReadFile(ByVal fileName As String, _ 9+Np4i@ ByRef lineArray() As String) As Long fDv2JdiU J!dm-L ReadFile = -1 }T(D7|^R Dim oFSO As Object <sb~ ^B Set oFSO = CreateObject("Scripting.FileSystemObject") L>jY.d2w=K Erase lineArray K@
I9^b 8V'~UzK Dim fid As Long '$i:
2mn, If oFSO.fileexists( fileName ) Then BtkOnbz8X fid = FreeFile() Ua:}V n&! Open fileName For Input As fid KLST\Ln: lineArray = Split(Input(LOF(fid), fid), vbCrLf) r8`ffH Close fid g];!&R- End If p$S*dr Set oFSO = Nothing ER%^!xA Return UBound( lineArray ) ~[t[y~Hup G30-^Tr End Function x]}^v# `'DmDg Sub GetFileList( ByVal in_dir As String, _ KjD/o?JUr ByRef in_flist() As String ) T$8)u'-pa w'>p Y 'Redimension the file list array =Qy<GeY Erase in_flist j`{?OYD Hus)c3Ty7 'Tracks how many files are found T^zXt? Dim fCount As Long ju8>:y8 fCount = 0 wW Lj?;bx #|uCgdi 'Recurse directory and search for text files \[;0KV_ Dim f As String /ixp&Z|7 f = Dir$(in_dir & "*.txt") ^
gdaa>L While f <> "" 0Um2DjTCG ReDim Preserve in_flist(fCount) ^}RCoE in_flist(fCount) = f /T"+KU* fCount += 1 z<MsKD0Q f = Dir$() p?02C#p Wend lov!o:dJ ReDim Preserve in_flist(fCount-1) $zUP?Gq! &sl0W-;0 End Sub f[]dfLS"W
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