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摘要: LLV:E{`p D1x~d<j 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。 265df
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aks*^| 背景: !J'BAq[x 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。 D0tI 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。 c00a;=ji 图1. RPC Photonics工程漫射体结构及光束投射形状 0FHN o{nBtxZ" lYD-U8 步骤 #L[Atx (t fADaJM 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。 </Q<*@p? OG/R6k. 图2. RPC Photonics工程漫射体不同类型的散射数据 #t
po@pJsE 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) s#-`,jqD 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 !V#(g ./W 例如下所示: c?j /H$ Sample name: EDF-C1-56 +-K-CXt Merging data from file EDF-C1-56 0-0.txt n1!0KOu/N Finished merging RPC data for sample EDF-C1-56 /oE@F178 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt )0~zL} )? 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 jQ(qaX&
a. 创建一个新的散射库 ,7z.%g3+z b. 散射模型命名 op/|&H' c. 改变散射模型为“Tabulated BSDF”. U''/y\Z 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 ) E<D45C{DP 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。 45q-x_ 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, h@@2vs2 g. 点击OK QUwSnotgU 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Z^>{bW ,o*x\jrGw WEOW6UV( 脚本代码: DXsp 2 b~WiE? '#Language "WWB-COM" UuzT*Y> MG<F.u Option Explicit `o)rAD^e rAM{< Sub Main 5@F1E8T C`%cPl 'Cleanup >5'C<jc C ClearOutputWindow() 4&&((H
Qis[j-?: Print "Merging RPC Photonics BSDF Data Files" 'UUIY$V[ SetTextColor(255,0,0) "+~La{POc Print "Note: Script should be located in the same folder as the BSDF TXT files." 2dFC{US' Print "Note: Do not run this script multiple times without deleting the output file between executions." N/4`afiV. SetTextColor(0,0,0) M]vcW 4'RyD<K\ 'Current directory of this script (should be the same as the text files being merged) XcAx@CY9c Dim cDir As String #kR8v[Z cDir = MacroDir$ & "\" ncuqo'r i<m 1^a#C' 'Array which will be populated with the list of files to be merged a;r,*zZ=" Dim fList() As String, curFile As String j;WZ[g#t GetFileList( cDir, fList ) [z'PdYQR/{ "
;8H;U` Print "" |$f.Qs~? Print "Files found for merging:" >ZTRwy`_( For Each curFile In fList &Egw94l Print Chr(9) & curFile q@1b{q#C5 Next ]4^9Tw6
_b vR[XbsNM 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. Y`eU WCD Dim nameArray() As String, sampName As String ABuK`(f. nameArray = Split(fList(0)," 0-0.txt") :70[zo7n' sampName = nameArray(0) A NR?An Print "" :D|"hJ Print "Sample name: " & Chr(9) & sampName 8eCC
=Az: Zi<Y?Vm/,O 'Open an output file and write the FRED header data w~{NNK;"j Dim outFile As String F%Oy4*4 outFile = cDir & sampName & "_FRED.txt" i|?EgGFG Open outFile For Output As #1 X0wvOs: Print #1, "type bsdf_data" pN|BtrN{ Print #1, "format angles=deg bsdf=value scale=1" 7:awUoV8f $Y&
8@/L 'Loop the file list, skip the two header lines and write the remaining data to file D"UCe7 Dim lineArray() As String, curLine As Long &Azfpv For Each curFile In fList tbG^9d Print "Merging data from file " & curFile wK>a&`< ReadFile( cDir & curFile, lineArray ) C^oj/}^ For curLine = 2 To UBound(lineArray) Osz:23(p Print #1, lineArray(curLine) 0'j/ 9vm Next )(V|d$n Next P_6JweN 2NMS'"8 'Close the output file j
N":9+F Close #1 hA 1_zKZ 82d~>i%T Print "Finished merging RPC data for sample " & sampName b/"&E'5-`\ Print "FRED formatted data file: " & Chr(9) & outFile Y<0}z>^ End Sub jiw5>RNt NNDW)@p6z 'Utility function to read the contents of a file into an array of strings. X0G6Wp Function ReadFile(ByVal fileName As String, _ Lmh4ezrdH ByRef lineArray() As String) As Long ($s%5| lqdil l\ ReadFile = -1 drRi<7
i Dim oFSO As Object p6P .I8g Set oFSO = CreateObject("Scripting.FileSystemObject") xb8S)zO]Q Erase lineArray '$nm~z,V Q1hHK'3w Dim fid As Long qrdA4S If oFSO.fileexists( fileName ) Then 8);G'7O fid = FreeFile() GS_+KR\ Open fileName For Input As fid E^'f'\m lineArray = Split(Input(LOF(fid), fid), vbCrLf) R(.5Hs Close fid f)'mpp^ End If ^/c v8M= Set oFSO = Nothing <yNu/B.M Return UBound( lineArray ) *n]f) Jc +hiskV@ v End Function ^UJB%l WK$d<:" Sub GetFileList( ByVal in_dir As String, _ Q6qIx=c4 ByRef in_flist() As String ) B=!&rKF 4 q-/R 'Redimension the file list array ]]"O)tWHj Erase in_flist ?F=^&
v8 k{Ad(S4J& 'Tracks how many files are found SHcFnxEAIH Dim fCount As Long STln_'DF' fCount = 0 Sao4MkSz[] tRC*@>I$ 'Recurse directory and search for text files t,P_&0X Dim f As String ZsnFuk#W f = Dir$(in_dir & "*.txt") 9I1D'7wI^^ While f <> "" PoB-:G6 ReDim Preserve in_flist(fCount) (D5sJ$&E@\ in_flist(fCount) = f AT{rg/oSf fCount += 1 uT :Yh6 f = Dir$() O-uno{Fd* Wend !v fbgK ReDim Preserve in_flist(fCount-1) <y`MUpf] A.YXK%A% End Sub Q%T[&A}3B NpPuh9e{ S&JsDPzSd QQ:2987619807 vw
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