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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。 E@7);i5K &z?:s 背景: i2 G.<(3O 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。 `R,g_{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。 evGUl~</~ 图1. RPC Photonics工程漫射体结构及光束投射形状
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ws< (LH Wph@LRB] 步骤 "RLv{D<)J,
R>R8LIZZc 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。 rLp (}^ ##BfI`FJ 图2. RPC Photonics工程漫射体不同类型的散射数据
i^hEL2S/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) =p>IP"HJ 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 G1G*TSf 例如下所示: FS7@6I2Ts Sample name: EDF-C1-56 u:M)JG Merging data from file EDF-C1-56 0-0.txt /<Yz;\:Jy Finished merging RPC data for sample EDF-C1-56 Zk>#T:{h FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt CZw]@2/JuQ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 aM|;3j1p a. 创建一个新的散射库 .dKFQH iYJ b. 散射模型命名 4x"9Wr=} c. 改变散射模型为“Tabulated BSDF”. ZiaHLpk 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 ) 9qI#vHA 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。 PdSYFJM 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, ' ?uwUBi g. 点击OK ^!rAT1(/_ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 3NSX(gC% dzs(sM= [(*? 脚本代码: PgdHH:v) 1fqJtP6 '#Language "WWB-COM" N;R I
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IIO-Jr Option Explicit l$ufW| ,$(a,`s) Sub Main ?g9oiOhnG .>
5[; 'Cleanup 'nN'bVl/ ClearOutputWindow() nR8r$2B+t U5ME`lN*` Print "Merging RPC Photonics BSDF Data Files" xl ,(=L] SetTextColor(255,0,0) SGP)A(,k9 Print "Note: Script should be located in the same folder as the BSDF TXT files." GUC.t7! Print "Note: Do not run this script multiple times without deleting the output file between executions." I6Ga'5bV SetTextColor(0,0,0) U?=-V8#M| wyB 'Current directory of this script (should be the same as the text files being merged) vbEO pYCS Dim cDir As String =XFyEt cDir = MacroDir$ & "\" _&e$?hY v,d'SR. 'Array which will be populated with the list of files to be merged A5go)~x\ Dim fList() As String, curFile As String *AJYSa,z GetFileList( cDir, fList ) "P a y2 kK/([! Print "" S`pB EM Print "Files found for merging:" Mb=j'H<N@ For Each curFile In fList 65U&P5W Print Chr(9) & curFile eS/Au[wS Next %r]V:d+ z!aU85y 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. R\-]t{t` Dim nameArray() As String, sampName As String `J%35 nameArray = Split(fList(0)," 0-0.txt") zKfY0A R sampName = nameArray(0) LC})aV| Print "" 9QHV%% Print "Sample name: " & Chr(9) & sampName s9,Z}]Th {
t@7r 'Open an output file and write the FRED header data ]JHInt Dim outFile As String @ \*Zq outFile = cDir & sampName & "_FRED.txt" eFC~&L; Open outFile For Output As #1 f&!{o= Print #1, "type bsdf_data" oAgU rl;R Print #1, "format angles=deg bsdf=value scale=1" 1F R 1!;4I@W(I) 'Loop the file list, skip the two header lines and write the remaining data to file v)JS4KS Dim lineArray() As String, curLine As Long '?1g_C QsS For Each curFile In fList M8${&&[; Print "Merging data from file " & curFile UBw*}p ReadFile( cDir & curFile, lineArray ) r*UE>_3J For curLine = 2 To UBound(lineArray) ^/)%s 3 Print #1, lineArray(curLine) gWfMUl Next u1`JvfLrL Next ^00C"58A `#?]g ! 'Close the output file O?0`QMY Close #1 aSIoq}c( R%6KxN)+@ Print "Finished merging RPC data for sample " & sampName Hb\['VhzM Print "FRED formatted data file: " & Chr(9) & outFile 7A^L$TY End Sub A8
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