RPC Photonics扩散片BSDF
摘要: CW(]6s u{ silTL_$ 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。 BfLh%XC *pMgjr 背景: p;!'5 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。 _5^p+ 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。 zMT0ToG
图1. RPC Photonics工程漫射体结构及光束投射形状 K8.=bGyg "}i\"x;s Hnwir!=7 步骤 ;r[@;2p*( C:n55BE9 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。 y ?FKou' $/%|0tQ
图2. RPC Photonics工程漫射体不同类型的散射数据 eUYd0L! 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 5$Yt@8; 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 C3af>L@} 例如下所示: EPCu Sample name: EDF-C1-56 JJ3(0
+ Merging data from file EDF-C1-56 0-0.txt FAVw80?5k Finished merging RPC data for sample EDF-C1-56 n&x#_B- FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt r'/7kF- 5 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NTk"W!<Cl2 a. 创建一个新的散射库 n&=3Knbd@d b. 散射模型命名 8CxC`*L( c. 改变散射模型为“Tabulated BSDF”. lm}mXFf# 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 ) sgDlT=c' 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。 ?d1H]f<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, /JL2dBy#z g. 点击OK M3j_sd'N 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KaC+x-%K c+/SvRx^> Ij
hC@5qk 脚本代码: iIwMDlQ " i,BE]w '#Language "WWB-COM" QDS=M] 0nS69tH Option Explicit zqg4@"
p d#.9!m~. Sub Main PNLtpixZ h_4o4# 'Cleanup h
Ns<Ae ClearOutputWindow() }E+}\& -A>1L@N Print "Merging RPC Photonics BSDF Data Files" Hq h SetTextColor(255,0,0) N=&~3k Print "Note: Script should be located in the same folder as the BSDF TXT files." `d,hP"jBc Print "Note: Do not run this script multiple times without deleting the output file between executions." Vd[[< SetTextColor(0,0,0) k41lw^Jh a!}.l< ) 'Current directory of this script (should be the same as the text files being merged) <4,>`#NEo Dim cDir As String NrVrR80Y cDir = MacroDir$ & "\" 4f<%<Z dV<|ztv 'Array which will be populated with the list of files to be merged s4bLL Dim fList() As String, curFile As String +5Yc/Qp GetFileList( cDir, fList ) "q4c[dna |:n4t6 Print "" 4flyV - Print "Files found for merging:" s.]7c
CY For Each curFile In fList 3Xaw Print Chr(9) & curFile |l(rR06#.] Next w
`6qT3v [>+(zlK" 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. pPm[<^\# S Dim nameArray() As String, sampName As String l?v-9l M nameArray = Split(fList(0)," 0-0.txt") KK`P<^8J sampName = nameArray(0) iIu Print "" |*"uj Print "Sample name: " & Chr(9) & sampName ]L4B
.Ya]N+r* 'Open an output file and write the FRED header data P&C,E E$ Dim outFile As String O.e^?ysp/ outFile = cDir & sampName & "_FRED.txt" LX[J6YKR Open outFile For Output As #1 \"c;MK{ Print #1, "type bsdf_data" wxEFM)zr Print #1, "format angles=deg bsdf=value scale=1" &*RJh'o|N( ,/{mRw% 'Loop the file list, skip the two header lines and write the remaining data to file 2>0[^ .;" Dim lineArray() As String, curLine As Long wy"^a45h For Each curFile In fList vr2tIKvpn Print "Merging data from file " & curFile %>}6>nT# ReadFile( cDir & curFile, lineArray ) O/$pT%D1x For curLine = 2 To UBound(lineArray) rxjMCMF Print #1, lineArray(curLine) 7yxZe4~|# Next 'n%Ac&kk Next 4UmTA_& Io &=5 'Close the output file Gd1%6}<~ Close #1 4A.ZMH 8;/`uB:zV Print "Finished merging RPC data for sample " & sampName 7!.%HhU0 Print "FRED formatted data file: " & Chr(9) & outFile X6%w6%su5 End Sub o&)O&bNJ Z=n#XJO15 'Utility function to read the contents of a file into an array of strings. \ Xow#@[ Function ReadFile(ByVal fileName As String, _ DesvnV'{`
ByRef lineArray() As String) As Long [R-4e; SRh F@4XORO; ReadFile = -1 ?#ue:O1 Dim oFSO As Object |ZW%+AQ| Set oFSO = CreateObject("Scripting.FileSystemObject") lg1yj}br Erase lineArray 1BUdl=o>S nw[DI%Tp Dim fid As Long S3]Cz$ If oFSO.fileexists( fileName ) Then TDXLxoC? fid = FreeFile() qN}kDT Open fileName For Input As fid 2
|w;4 lineArray = Split(Input(LOF(fid), fid), vbCrLf) }C.M4{a\ Close fid 8WK%g0gm End If o-2FGM`*VB Set oFSO = Nothing ?#idmb}( Return UBound( lineArray ) N r5
aU6] ^^QW< End Function >HO{gaRM HByk 1 Sub GetFileList( ByVal in_dir As String, _
IE!fNuR4 ByRef in_flist() As String ) YJ_`[LnL Hi #'h 'Redimension the file list array fBS`b[x Erase in_flist /WXy!W30< Y\luz`v 'Tracks how many files are found de]r9$D Dim fCount As Long CPc<!CC fCount = 0 }yCJ#} vUl5%r2O4 'Recurse directory and search for text files "f\2/4EIl Dim f As String dP[l$/ f = Dir$(in_dir & "*.txt") 4Z>hP]7
While f <> "" &WAO.*:y ReDim Preserve in_flist(fCount) aZ^P*|_K3 in_flist(fCount) = f D(xgadr fCount += 1 4} uX[~e& f = Dir$() R>H*MvN Wend $by-?z(( ReDim Preserve in_flist(fCount-1) D ODo
! _l,?Y;OF End Sub z5IHcZ LcCb[r }ny,Nl QQ:2987619807 OJ$169@;
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