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摘要: kU=U u> awvP;F?q| 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。 GBWL0'COV <<E9MIn_ 背景: QxGcRlpLK 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。 iP;"-Mj 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。 #^Pab^Y3r- 图1. RPC Photonics工程漫射体结构及光束投射形状 GN9kCyPK XZM@Rys J=gFiBw 步骤 Z<^!N) vp.?$(L^@/ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 |FM*1Q[1 '21gUYm 图2. RPC Photonics工程漫射体不同类型的散射数据 S4[#[w`= 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) hjM?D`5x 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 &e;Qabwxva 例如下所示: I[v`)T'_{ Sample name: EDF-C1-56 FMI1[|:; Merging data from file EDF-C1-56 0-0.txt '
|B3@9< Finished merging RPC data for sample EDF-C1-56 **kix FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 3l41"5Fy& 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RLMn&j|?e a. 创建一个新的散射库 rF"p7 b. 散射模型命名 qP<D9k> c. 改变散射模型为“Tabulated BSDF”. 4oueLT(zc d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) gGUKB2) e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 `>`b;A4 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ^V#,iO9.- g. 点击OK !|i #g$ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^.\O)K {h d[J_iD{ & MuQ)F-GSUu 脚本代码: PnaiSt9p?r %K-8DL8|( '#Language "WWB-COM" h_S>Q D\9-/p Option Explicit &JqaIJh
,xVAJ6_# Sub Main megTp i2c|_B 'Cleanup c>{QTI:] ClearOutputWindow() S6JXi>n 0]iaNR
% Print "Merging RPC Photonics BSDF Data Files" @v2ko5 SetTextColor(255,0,0) ?_^{9q%9 Print "Note: Script should be located in the same folder as the BSDF TXT files." "O<ETHd0 Print "Note: Do not run this script multiple times without deleting the output file between executions." Q= xXj'W- SetTextColor(0,0,0) dCTyfXou[= Yg3nT:K_Y& 'Current directory of this script (should be the same as the text files being merged) #0[^jJ3J Dim cDir As String j;Z?q%M{6 cDir = MacroDir$ & "\" qJrKt=CE 9g5h~Ma 'Array which will be populated with the list of files to be merged qx[c0X! Dim fList() As String, curFile As String z<vh8dNl GetFileList( cDir, fList ) lYJSg70P U|%}B( Print "" WEif&<Y Print "Files found for merging:" ,:A;4 For Each curFile In fList |oXd4 Print Chr(9) & curFile ][v]Nk Next y"q>}5 vBl:&99[/ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 60u_,@rV Dim nameArray() As String, sampName As String a~$Y;C_#< nameArray = Split(fList(0)," 0-0.txt") Lm2)3;ei sampName = nameArray(0) 5HV+7zU5 Print "" %csrNf Print "Sample name: " & Chr(9) & sampName qz>R"pj0g .Lna\Bv 'Open an output file and write the FRED header data /~ {`!30 Dim outFile As String ~BmA!BZV` outFile = cDir & sampName & "_FRED.txt" m)Kg6/MV. Open outFile For Output As #1 qrlC
U4 Print #1, "type bsdf_data" ]>VG}e~b Print #1, "format angles=deg bsdf=value scale=1" _<F)G,= !EhKg)y= 'Loop the file list, skip the two header lines and write the remaining data to file c Pf_B= Dim lineArray() As String, curLine As Long 4v hz`1 For Each curFile In fList c:Nm!+5_( Print "Merging data from file " & curFile }ARA K ^% ReadFile( cDir & curFile, lineArray ) J4"Fj, FS For curLine = 2 To UBound(lineArray) R/ZScOW[ Print #1, lineArray(curLine) =#S.t:HQ* Next +wmG5!%$| Next ~E7IU<B XH$r(@Z\7 'Close the output file $3g{9)} Close #1 lFyDH{! S*V}1</L Print "Finished merging RPC data for sample " & sampName |2u=3#Jp Print "FRED formatted data file: " & Chr(9) & outFile j,+]tHC- End Sub I'BhN#GhX "a8E0b 'Utility function to read the contents of a file into an array of strings. k_=yb^6[U Function ReadFile(ByVal fileName As String, _ - |g"q| ByRef lineArray() As String) As Long 5o dT\>Sn !ka* rd ReadFile = -1 rQVX^ Dim oFSO As Object 73D<wMgZF Set oFSO = CreateObject("Scripting.FileSystemObject") Lz'VQO1U= Erase lineArray '|zrzU= 0<-E)\:[g Dim fid As Long :lcq3iFn If oFSO.fileexists( fileName ) Then nTEN&8Y>R fid = FreeFile() xf]K Open fileName For Input As fid 4V')FGB$ lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0
Uropam Close fid `x`[hJ?i End If mLxgvp Set oFSO = Nothing 05`"U#`: Return UBound( lineArray ) 64zOEjra &Vz$0{d5 End Function dz] 5s l4oyF|oJTH Sub GetFileList( ByVal in_dir As String, _
J, 9NVw$ ByRef in_flist() As String ) No'?8 +i 6:7[>|okQ 'Redimension the file list array Cku"vVw, Erase in_flist "d_wu#fO) >%j%Mj@8q| 'Tracks how many files are found v _MQ]X Dim fCount As Long :CyHo6o9 fCount = 0 \!-BR0+y; hw^&{x 'Recurse directory and search for text files y2G Us&09 Dim f As String ?l0Qi f = Dir$(in_dir & "*.txt") $v|W2k While f <> "" ]dpL
PR ReDim Preserve in_flist(fCount) `<C<[JP:o in_flist(fCount) = f KUAzJ[> fCount += 1 Q5+1'mzAB f = Dir$() Gmz^vpQ]t Wend 4+RR`I8$Ge ReDim Preserve in_flist(fCount-1) `@/)S^jBau #Vq9 =Q2 End Sub pjWRd_h. kJWg},-\ % =^/^[D QQ:2987619807 J7`mEL>?
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