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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。 =th(Hdk17 ZmJ!ZKKch 背景: Nb[zm|. 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。 +Wr"c 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。 Sr9)i8x{ 图1. RPC Photonics工程漫射体结构及光束投射形状
jbDap i< {giKC)! (wMiXi 步骤 ZQ&A'(tt4
, Ww\C 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。 f3g#(1 7W{xK'|] 图2. RPC Photonics工程漫射体不同类型的散射数据
{~Q9jg(A 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)
;8?i 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 /b44;U`v5- 例如下所示: ?u*gKI Sample name: EDF-C1-56 1XwW4cZ>: Merging data from file EDF-C1-56 0-0.txt *{ =5AW}o Finished merging RPC data for sample EDF-C1-56 0n'~wz"wB FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt TA
x9<' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NXJyRAJ*% a. 创建一个新的散射库 "0,d)L0," b. 散射模型命名 x_C#ALq9 c. 改变散射模型为“Tabulated BSDF”. li U=&wM> 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 ) m|7lDfpb 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。 !I7bxDzK$ 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, /Ir|& <yB g. 点击OK e:h(, 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 I6k S1 '1$#onx -<R" 脚本代码: j K!Y- c`hj^t '#Language "WWB-COM" r35'U#VMk? zW,Nv>Ac5 Option Explicit (Wj2%*NT N@o Ng}D&: Sub Main 8Wa&&YTB 3?}W0dZ$d 'Cleanup {3jV ,S ClearOutputWindow() #Cwzk{p( RR%[]M#_T Print "Merging RPC Photonics BSDF Data Files" &TpzJcd" SetTextColor(255,0,0) h-^7cHI} Print "Note: Script should be located in the same folder as the BSDF TXT files." B\/"$" Print "Note: Do not run this script multiple times without deleting the output file between executions." d%"?^e SetTextColor(0,0,0) ?=UIx24W C< :F<[H 'Current directory of this script (should be the same as the text files being merged) UUzu`>upB Dim cDir As String z3RlD"F1 cDir = MacroDir$ & "\" np>RxiB^ Ar+<n 2;[ 'Array which will be populated with the list of files to be merged v}$s,j3NO Dim fList() As String, curFile As String v(HCnC GetFileList( cDir, fList ) dHcGe{T^( rm-6Az V Print "" ]h
Dy] Print "Files found for merging:" c:a5pd7T For Each curFile In fList Esc*+}ck Print Chr(9) & curFile jq4'=L$4 Next 2EHeQ|# :%#(<@ { 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. D^E+#a 1 Dim nameArray() As String, sampName As String l c<&f nameArray = Split(fList(0)," 0-0.txt") 8?n6\cF sampName = nameArray(0) 80/6-_g( Print "" 0(uNFyIG Print "Sample name: " & Chr(9) & sampName R*C WIe2j 'Open an output file and write the FRED header data tRqg')y Dim outFile As String Jb~nu outFile = cDir & sampName & "_FRED.txt" )u. ut8![T Open outFile For Output As #1 `7;I*| Print #1, "type bsdf_data" *-!&5~o/U Print #1, "format angles=deg bsdf=value scale=1" \2rCT~x 7[V6@K!Al[ 'Loop the file list, skip the two header lines and write the remaining data to file .kBZ(`K Dim lineArray() As String, curLine As Long &DqeO8?Q For Each curFile In fList G4jaHpPi Print "Merging data from file " & curFile UUxDW3K ReadFile( cDir & curFile, lineArray ) \XG18V& For curLine = 2 To UBound(lineArray) x*)@:W! Print #1, lineArray(curLine) iNTw;ov Next +sTZ)
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