RPC Photonics扩散片BSDF
摘要: vy W/f zOA{S~> 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。 K~"uZa^s K(RG:e~R0i 背景: UO^"<0u 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。 HRO:U% 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。 <+D(GH};
图1. RPC Photonics工程漫射体结构及光束投射形状 y7aBF13Kl vU&I,:72
H |@KW~YlE 步骤 uPbvN[~t >mRA|0$ 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。 Zh. 5\&bm '&@'V5}C{
图2. RPC Photonics工程漫射体不同类型的散射数据 fR<_ 4L 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]yQMY\2) 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 eqD|3YX 例如下所示: bL\ab Sample name: EDF-C1-56 \{ Merging data from file EDF-C1-56 0-0.txt In)8AK(Hw Finished merging RPC data for sample EDF-C1-56 En$-,8\% FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ; V)pXLE 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Yt79W a. 创建一个新的散射库 }$5S @, b. 散射模型命名 _j t>%v4}4 c. 改变散射模型为“Tabulated BSDF”. Sw HrHj 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 ) 1,,kU 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。 EJ7}h?a]U_ 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, 0<"4W: g. 点击OK {xb8H 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (VeX[*}I rhU]b $A ?m5@ 635 脚本代码: =\]5C x*GGO)r
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{rj Sub Main $<R\|_6J Do-~-d4 'Cleanup apsR26\^ ClearOutputWindow() SSH ))zJ Tjba@^T Print "Merging RPC Photonics BSDF Data Files" `)e5pK SetTextColor(255,0,0) eZpyDw C{ Print "Note: Script should be located in the same folder as the BSDF TXT files." feg Print "Note: Do not run this script multiple times without deleting the output file between executions." ,z A9* SetTextColor(0,0,0) r}>8FE9S'H ph*9,\c8 'Current directory of this script (should be the same as the text files being merged) Ni]V)wGE; Dim cDir As String r(= cDir = MacroDir$ & "\" 98 dl -? $80TRB# 'Array which will be populated with the list of files to be merged c:QZ(8d]L Dim fList() As String, curFile As String cm`Jr#kl{ GetFileList( cDir, fList ) kY d'6+m -E,
d)O`;$ Print "" f;os\8JdM Print "Files found for merging:" B",5"'id For Each curFile In fList SM%N]/@U Print Chr(9) & curFile dw'&Av'
|E Next i=Nq`BoQf }G8gk"st 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. nymF`0HYe1 Dim nameArray() As String, sampName As String ?#N:
a nameArray = Split(fList(0)," 0-0.txt") Sg#$
B#g sampName = nameArray(0) ./SDZ:5/ Print "" ]Rah,4?9f Print "Sample name: " & Chr(9) & sampName C(N' +VV_ 5q<cZ)v#& 'Open an output file and write the FRED header data +f h@m
h0[ Dim outFile As String l|WdJn
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outFile = cDir & sampName & "_FRED.txt" |qUi9#NUo Open outFile For Output As #1 wm1`<r^M. Print #1, "type bsdf_data" T!![7Rs Print #1, "format angles=deg bsdf=value scale=1" 7 'T3Wc ['~E _z 'Loop the file list, skip the two header lines and write the remaining data to file zVEG)
Hr Dim lineArray() As String, curLine As Long Ag[Zs%X For Each curFile In fList dJvT2s.t[ Print "Merging data from file " & curFile ?w^MnK0U) ReadFile( cDir & curFile, lineArray ) 5"~F#vt For curLine = 2 To UBound(lineArray) zG
IxmJ. Print #1, lineArray(curLine) aCxF{>n
Next RCZ"BxleU Next Ez()W,6]g *dmBJi} 'Close the output file !{u`}:\ Close #1 dWc'R wL SSr#MIS? Print "Finished merging RPC data for sample " & sampName aM U0BS" Print "FRED formatted data file: " & Chr(9) & outFile G5Mo IC End Sub =()Vrk|uK xh6Yv%\@ 'Utility function to read the contents of a file into an array of strings. hQWo ]WF(J Function ReadFile(ByVal fileName As String, _ Z;v5L/; ByRef lineArray() As String) As Long KM-d8^\: =6.4 ReadFile = -1 ?/@U#Qy Dim oFSO As Object e\8|6<o[ Set oFSO = CreateObject("Scripting.FileSystemObject") Jy^.L$bt Erase lineArray >O;V[H2[ P/!W']OO Dim fid As Long Z]~) ->=} If oFSO.fileexists( fileName ) Then 7\0}te fid = FreeFile() p<Oz"6_/~ Open fileName For Input As fid OrC}WMhd lineArray = Split(Input(LOF(fid), fid), vbCrLf) MpNgp)%> Close fid 2gasH11M End If @PL.7FM<v Set oFSO = Nothing =)c^ik%F& Return UBound( lineArray ) gJ=y7yX 'w$jVX/ End Function ( IXUT6| s~p(59 Sub GetFileList( ByVal in_dir As String, _ `1`Qu! ByRef in_flist() As String ) k_?Z6RE> `=Z3X(Kc 'Redimension the file list array wU}%]FqtZ= Erase in_flist 5+DId7d'n 6*&$ha}X 'Tracks how many files are found saa3BuV 6 Dim fCount As Long jk\z-hd fCount = 0 ` n#Db "@^^niSFl 'Recurse directory and search for text files I/B *iW^ Dim f As String cM_!_8o f = Dir$(in_dir & "*.txt") #3knKBH While f <> "" Nsf>b 8O ReDim Preserve in_flist(fCount) xNd p]u in_flist(fCount) = f gyz_$T@x fCount += 1 y*#YIS56I f = Dir$() ,;@vVm'} Wend V(5*Dn84 ReDim Preserve in_flist(fCount-1) d-cW47 R wTzS; End Sub L$z(&%Nx
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