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摘要: V =aoB
Z (DMnwqr 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。 ?M-8Fp3 + Q.2nUT` 背景: O-lh\9{'R 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。 x(zZqOed 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。 a={qA4N 图1. RPC Photonics工程漫射体结构及光束投射形状 ^}7t: U4L=3T+:[ lvJ{=~u 步骤 ftU5A@(T E,"btBg 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。 ^RAFmM#F MHyl=5 图2. RPC Photonics工程漫射体不同类型的散射数据 c2mt<DtWW 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) cASHgm 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 Hh;6B!zb+ 例如下所示: {BCjVmY Sample name: EDF-C1-56 =egi?Ne Merging data from file EDF-C1-56 0-0.txt jsaCnm>& Finished merging RPC data for sample EDF-C1-56 ZpctsCz] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 10 H! 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 OHnjI>/ a. 创建一个新的散射库 $(L7/M b. 散射模型命名 N&h!14]{Z c. 改变散射模型为“Tabulated BSDF”. Ib8{+j d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) "jc)N46 e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 sK/" f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, D=sc41] g. 点击OK Z:$b)+2:\ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 9x{prCr +vSE} .);:K 脚本代码: A y[L{!)2{ T|2%b*/ '#Language "WWB-COM" _:p_#3s$ 9:w,@Phe Option Explicit LhRe?U\ ^|;4/=bbs Sub Main R,+(JgJ !D&MJThNy 'Cleanup c+/C7C o ClearOutputWindow() YY~=h5$ j:KQIwc Print "Merging RPC Photonics BSDF Data Files" rg/vxTl SetTextColor(255,0,0) Y(Ezw !a Print "Note: Script should be located in the same folder as the BSDF TXT files." Y mjS!H Print "Note: Do not run this script multiple times without deleting the output file between executions." :=eUNH SetTextColor(0,0,0) J\D3fh97- 2B dr#qr 'Current directory of this script (should be the same as the text files being merged) :Rj,'uH+h) Dim cDir As String 1 ZFSz{ cDir = MacroDir$ & "\" ea>\.D-S m9cT}x&j 'Array which will be populated with the list of files to be merged mxA )r5sx Dim fList() As String, curFile As String 0w. _}Cz GetFileList( cDir, fList ) wu&7#![, rXPx*/C Print "" wT yM9wz& Print "Files found for merging:" JW'acD For Each curFile In fList a\_,_psK Print Chr(9) & curFile lFY8^#@ Next j1+Y=@MA >v,j;[( 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. }l!_m.#e Dim nameArray() As String, sampName As String Yb{t!KL nameArray = Split(fList(0)," 0-0.txt") Hvo27THLo sampName = nameArray(0) &:K? -ac Print "" _ u2 Print "Sample name: " & Chr(9) & sampName $Xc<K_Z -V/i%_+Ze 'Open an output file and write the FRED header data toJ&$HrE Dim outFile As String KZfRiCZ outFile = cDir & sampName & "_FRED.txt" 5K~6` Open outFile For Output As #1 .Kwl8xRg Print #1, "type bsdf_data" *G41%uz Print #1, "format angles=deg bsdf=value scale=1" ZS_f',kE Uk\U*\. 'Loop the file list, skip the two header lines and write the remaining data to file 8:fiO|~% Dim lineArray() As String, curLine As Long SH|$Dg For Each curFile In fList UOOme)\> Print "Merging data from file " & curFile zAUfd[g ReadFile( cDir & curFile, lineArray ) c%.&F For curLine = 2 To UBound(lineArray) oH"N>@ Vl Print #1, lineArray(curLine) {2@96o2} Next \9QOrjiw Next *$D-6}Oay =
g}yA=. 'Close the output file zUqDX{I8 Close #1 ht9b=1wd%s ?s33x# Print "Finished merging RPC data for sample " & sampName P$I\)Q H Print "FRED formatted data file: " & Chr(9) & outFile G].KJ5,y
End Sub ;D:T
^4 0{F.DDiNT 'Utility function to read the contents of a file into an array of strings. nVzo=+Yp Function ReadFile(ByVal fileName As String, _ PM7/fv*, ByRef lineArray() As String) As Long UXHFti/A< Shz;)0To ReadFile = -1 sKO
;p Dim oFSO As Object e,8-P-h~T Set oFSO = CreateObject("Scripting.FileSystemObject") Q,`kfxA`O Erase lineArray _@2G]JD y9)",G! Dim fid As Long 9#!tzDOtD If oFSO.fileexists( fileName ) Then 9<S-b |!@ fid = FreeFile() +)SX Open fileName For Input As fid }}_l@5 lineArray = Split(Input(LOF(fid), fid), vbCrLf) [dMxr9M Close fid &=bI3- End If [_n|n"M Set oFSO = Nothing n TG|Isa Return UBound( lineArray ) MzD0F#Y K>y+3HN[6 End Function pdSyx>rJ ^h=kJR9 Sub GetFileList( ByVal in_dir As String, _ e$=|-Jz ByRef in_flist() As String ) LKcrr; 9OUhV[D 'Redimension the file list array g\'sGt3 O Erase in_flist BL67sva; d%bL_I) 'Tracks how many files are found x}d\%*B Dim fCount As Long RMK
U5A7 fCount = 0 9"S3A EI fp0Va!T(V 'Recurse directory and search for text files .Ko`DH~!,C Dim f As String hM}2++V f = Dir$(in_dir & "*.txt") uk,f}Xc While f <> "" M_K&x-H0 ReDim Preserve in_flist(fCount) G<'S in_flist(fCount) = f 7f>n`nq? fCount += 1 >pKI' f = Dir$() zYgLGwi{ Wend kWFR(J&R ReDim Preserve in_flist(fCount-1) z61
o6mb ?t-2oLE End Sub |4vk@0L
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