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摘要: 4$2HO`@uN A9Ea}v9: 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。 mBrZ{hqS Qt'3v"S>) 背景: E<B/5g! 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。 7Y.yl F: 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。 j1Sjw6}GCH 图1. RPC Photonics工程漫射体结构及光束投射形状 IYptNR Wkb>JnPo $i8oLSRV 步骤 P&c O2 HWou&<EK 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。 &BKnJ{,H x5rm
2C 图2. RPC Photonics工程漫射体不同类型的散射数据 <|WXFjn 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) k?3mFWc 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 OL#i!ia. 例如下所示: {KTZSs $n Sample name: EDF-C1-56 t]3:vp5N] Merging data from file EDF-C1-56 0-0.txt =VWH8w.3 Finished merging RPC data for sample EDF-C1-56 CIwI1VR^ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt %ID48_>* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 M!VW/vdywL a. 创建一个新的散射库 { }Afah b. 散射模型命名 W1M Bk[:Q c. 改变散射模型为“Tabulated BSDF”. _iqaKYT$ 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 ) vXdI)Sx[ 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。
NQ '|M 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, /^~)iTwH g. 点击OK )h(=X&(d 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 - sq=| ,*L3 tC+11M 脚本代码: {Aj=Rj@ &ML-\aSal '#Language "WWB-COM" ^#h ;bX# [W'2z,S`WD Option Explicit #;P-*P "[_gRe*2 Sub Main dt=M#+g ZS&+<kGD 'Cleanup \<}e?Yx% ClearOutputWindow() uqBV KE 2R3)/bz-SV Print "Merging RPC Photonics BSDF Data Files" +9;6]4 SetTextColor(255,0,0) ob)c0Pz Print "Note: Script should be located in the same folder as the BSDF TXT files." PC,I"l Print "Note: Do not run this script multiple times without deleting the output file between executions." T%TO?[cN SetTextColor(0,0,0) 8js1m55KT
y?*Y=," 'Current directory of this script (should be the same as the text files being merged) )5diX
+
k Dim cDir As String xiC.M6/ cDir = MacroDir$ & "\" 0)vX
kf' 4C
"} 'Array which will be populated with the list of files to be merged IV`+B<3 Dim fList() As String, curFile As String Jd|E
4h~( GetFileList( cDir, fList ) =@;\9j }f6_7W%5 Print "" k <LFH( Print "Files found for merging:" 6I5LZ^/ G9 For Each curFile In fList @Rqn&tA8 Print Chr(9) & curFile 0n?^I>j Next z_$F)*PL a0wpsl
iF 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ^7`gf Dim nameArray() As String, sampName As String +4]f6Zz({ nameArray = Split(fList(0)," 0-0.txt") Q\le3KB sampName = nameArray(0) ^"J)^3j< Print "" :u?L
y[x Print "Sample name: " & Chr(9) & sampName EHq?yj; F{m?:A 'Open an output file and write the FRED header data j;&su=p" Dim outFile As String U,\t2z outFile = cDir & sampName & "_FRED.txt" l4E0/F Open outFile For Output As #1 0ol*!@? Print #1, "type bsdf_data" Xf|I=XK Print #1, "format angles=deg bsdf=value scale=1" 0{47TX*YX X_wPuU% 'Loop the file list, skip the two header lines and write the remaining data to file 5mI}IS|@ Dim lineArray() As String, curLine As Long HhqNpU For Each curFile In fList F*,RDM'M Print "Merging data from file " & curFile @aWd0e] ReadFile( cDir & curFile, lineArray ) Dgz^s^fxU For curLine = 2 To UBound(lineArray) 14 hE<u Print #1, lineArray(curLine) /V>yF&p
Next =?1B|hdo Next NMH'4R &>Nw>V 'Close the output file V.kf@ Close #1 yT C+5_7 K!|J/W Print "Finished merging RPC data for sample " & sampName TDW\n Print "FRED formatted data file: " & Chr(9) & outFile bR83N End Sub ^" UZ.@sq' /V E|F Ts 'Utility function to read the contents of a file into an array of strings. 3m/XT"D Function ReadFile(ByVal fileName As String, _ 6tBe,'* ByRef lineArray() As String) As Long ~|8-Mo1ce Ibu 5 ReadFile = -1 >B+!fi'SS> Dim oFSO As Object Uf\U~wM< Set oFSO = CreateObject("Scripting.FileSystemObject") y9Q.TL>=[ Erase lineArray t$ 3/ZTx M:.0]'[s5 Dim fid As Long )SWLX\b If oFSO.fileexists( fileName ) Then _G^Cc}X fid = FreeFile() O g!SFg* Open fileName For Input As fid 5P![fX|5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) "|d# +C Close fid ]R]%c*tA End If @*5(KIeeC> Set oFSO = Nothing %bgUU|CdA Return UBound( lineArray ) ~>>^7oq 3V0^v End Function yey]#M[y }6 MoC0 Sub GetFileList( ByVal in_dir As String, _ l
!:kwF ByRef in_flist() As String ) C "g bol^ G9r~O#=gy 'Redimension the file list array 18G=j@k7 Erase in_flist QJtO~~- A $W~R 'Tracks how many files are found \vqqs Dim fCount As Long D[p`1$E-1v fCount = 0 J*+[?FXRL Apc!!*7 'Recurse directory and search for text files `E8D5'tt Dim f As String D`2w>{Y f = Dir$(in_dir & "*.txt") RZqou|ki While f <> "" b_a6| ReDim Preserve in_flist(fCount) 4*V[^mht in_flist(fCount) = f JO&L1<B{v fCount += 1 ?dAy_|
zD f = Dir$() ^W,~ Wend i&\cDQ 3 ReDim Preserve in_flist(fCount-1) ?CE&F<?#@ E{{Kzr2$ End Sub C,VvbB jUd)|v+t /G= ?E]^ QQ:2987619807 QeG3X+
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