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摘要: ws$kwSHq 9j0o)] 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。 crgVedx~} 8RS@YO 背景: \J-D@b; 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。 FB3}M)G>M 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。 J M;WCV%NM 图1. RPC Photonics工程漫射体结构及光束投射形状 tNYuuC%N
| 1a}p AH:0h X6+ 步骤 H6lZ<R{= N7^sn!JB 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<l(F?_ jZiz 0[ 图2. RPC Photonics工程漫射体不同类型的散射数据 w/9%C(w6 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) !1
Y[e^ 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 RP k'1nD 例如下所示: '*<I<? z; Sample name: EDF-C1-56 .d?LRf Merging data from file EDF-C1-56 0-0.txt }:!X@C~ Finished merging RPC data for sample EDF-C1-56 eAjsMED FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt wVc^l 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 3`Xzp a. 创建一个新的散射库 2G_]Y8 b. 散射模型命名 kS=nH9 c. 改变散射模型为“Tabulated BSDF”. NQX?&9L`r 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 ) wfpl]d! 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。 >]xW{71F@ 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, -2 >s#/% g. 点击OK EP>Lh7E9n 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 gx',K1T 32?'jRN(ue <hiv8/)? 脚本代码: G5K?Q+n
.{*l, '#Language "WWB-COM" (GC5r#AnS ,(zV~-:9 Option Explicit ,aGIq. *v xkiiQs) Sub Main wy#>Aq 79@CO6 'Cleanup oz)4YBf ClearOutputWindow() 1"75+Q>D e&U$;sS` Print "Merging RPC Photonics BSDF Data Files" s%`l>#H SetTextColor(255,0,0) 5`+9<8V Print "Note: Script should be located in the same folder as the BSDF TXT files." n%#3xoa Print "Note: Do not run this script multiple times without deleting the output file between executions." "~._G5i. SetTextColor(0,0,0) 7pQ5`;P bv'>4a 'Current directory of this script (should be the same as the text files being merged) {*TB }Xsr, Dim cDir As String |N"K83_pr cDir = MacroDir$ & "\" m"'LT0nur B["+7\c<~ 'Array which will be populated with the list of files to be merged R=D}([pi Dim fList() As String, curFile As String .5o~^ GetFileList( cDir, fList ) W;2J~V!c F[yofRN Print "" nKS*y* Print "Files found for merging:" #jG?{j3;? For Each curFile In fList D&2NO/
R Print Chr(9) & curFile adIrrK Next o:W*#dt L6Brs"9B 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. G'#u!<(^h Dim nameArray() As String, sampName As String !/u nameArray = Split(fList(0)," 0-0.txt") W&R67ff| sampName = nameArray(0) +~aIT=i3 Print "" AG9DJ{T Print "Sample name: " & Chr(9) & sampName 5[jS(1a`c buN@O7\ 'Open an output file and write the FRED header data ![\P/1p Dim outFile As String ej&.tNvq outFile = cDir & sampName & "_FRED.txt" saP%T~ Open outFile For Output As #1 S`zu.8%5 Print #1, "type bsdf_data" Nc{&AV8Y_v Print #1, "format angles=deg bsdf=value scale=1" VrP{U-` cnQ2/ZZp~ 'Loop the file list, skip the two header lines and write the remaining data to file 5R~M@ Dim lineArray() As String, curLine As Long :??W3ROn For Each curFile In fList .BBJhXtrdu Print "Merging data from file " & curFile
`x#S.b ReadFile( cDir & curFile, lineArray ) {.AN4 For curLine = 2 To UBound(lineArray) /KF@Un_Ow Print #1, lineArray(curLine) sL~4~178 Next EJTM
>Rpor Next 6',Hs k)*apc\W 'Close the output file kBcTXl Close #1 ?{aJ#w ou~$XZ7oi Print "Finished merging RPC data for sample " & sampName MQx1|>rG Print "FRED formatted data file: " & Chr(9) & outFile }BI6dZ~2A End Sub 76@W:L*J$J e3TKQ( 'Utility function to read the contents of a file into an array of strings. 5G\OINxy Function ReadFile(ByVal fileName As String, _ =LV-n ByRef lineArray() As String) As Long !(? 7V 1_q!E~) ReadFile = -1 \|QB;7u
Dim oFSO As Object #UL75 Set oFSO = CreateObject("Scripting.FileSystemObject") v/rBjUc+X Erase lineArray CE96e y i56Rdb Dim fid As Long $ MH;v_'a If oFSO.fileexists( fileName ) Then 5Ex[}y9L` fid = FreeFile() uuwJ- Open fileName For Input As fid x
cAs}y} lineArray = Split(Input(LOF(fid), fid), vbCrLf) V.*M;T\i Close fid _3 oo%?} End If =O0A(ca"g Set oFSO = Nothing ;BH.,{*@B Return UBound( lineArray ) GLecBF+>F 4Xa]yA = End Function u_' -vZ_ iv +a5 Sub GetFileList( ByVal in_dir As String, _ Q%d%Io\-t ByRef in_flist() As String ) "Ux(nt !;*flr`/ 'Redimension the file list array 83R s1}* Erase in_flist H i8V=+ B//*hH >F 'Tracks how many files are found }M% 3 Dim fCount As Long ^0| :
fCount = 0 G-9i M KW~rrR 'Recurse directory and search for text files j#2Xw25 Dim f As String "o`?-bQ: f = Dir$(in_dir & "*.txt") ZwsQ}5 While f <> "" lAi5sN)|$ ReDim Preserve in_flist(fCount) P7=`P in_flist(fCount) = f BT8)t.+pv fCount += 1 N7lg6$s Aj f = Dir$() "A+7G5 Wend H%Vf$1/TF ReDim Preserve in_flist(fCount-1) oOND]> TxF^zx\ End Sub ynM~&]fk#k rrRv 7J&Q `WL3aI": QQ:2987619807 lG'D/#
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