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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。 /0(2PVf
y B_FfXFQm< 背景: NTRw:' 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。 $y!k)"k FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 )^+v*=Dc-i 图1. RPC Photonics工程漫射体结构及光束投射形状
pg3B^ Nrl&"IK|J 8l|v#^v 步骤 )A]E:]2
"hRw_< 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 zx7*Bnu0 {7^7)^@ 图2. RPC Photonics工程漫射体不同类型的散射数据
76[O3% 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) r!eCfV7 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 <UJgl{- 例如下所示: #4h_(Y Sample name: EDF-C1-56 :[gM 5G Merging data from file EDF-C1-56 0-0.txt Q1qf'u Finished merging RPC data for sample EDF-C1-56 -#]?3*NO FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt sa\v9 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 g`KVF"8 a. 创建一个新的散射库 C3fSSa%b b. 散射模型命名 s&S8P;K| c. 改变散射模型为“Tabulated BSDF”. 9wLV\>i[k d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) XAuB .)| e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 p#}38` f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, \m!swYy g. 点击OK #84pRU~ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q2;zve&Dl x;NCW ^ri?eKy.-g 脚本代码: qX{m7 ua(y! Im '#Language "WWB-COM" htbN7B( i][7S mN Option Explicit fRo_rj _ T2#
W=P Sub Main [T', ZLR| ;czMsHu0X 'Cleanup C)>
])'S ClearOutputWindow() <Vp7G%"'W }'{39vc . Print "Merging RPC Photonics BSDF Data Files" Yo:l@( SetTextColor(255,0,0) 70 !& Print "Note: Script should be located in the same folder as the BSDF TXT files." 8;7Y}c Print "Note: Do not run this script multiple times without deleting the output file between executions." rkA0v-N6v SetTextColor(0,0,0) DB'pRo+U v%3mhk# 'Current directory of this script (should be the same as the text files being merged) po_||NIY Dim cDir As String Z~o*$tF/ cDir = MacroDir$ & "\" c_xtwdkL9 &)L2a) 'Array which will be populated with the list of files to be merged JDVMq=ui Dim fList() As String, curFile As String Xr~6_N{J GetFileList( cDir, fList ) SymSAq0$F KU[eY} Print "" oo7&.HWf Print "Files found for merging:" !]Z> T5$ For Each curFile In fList a#W:SgE?Y Print Chr(9) & curFile DsY-JBDvoz Next tYyva }NPF]P; 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. W#|]m=2W Dim nameArray() As String, sampName As String QLo^6S5! nameArray = Split(fList(0)," 0-0.txt") p2|c8n== sampName = nameArray(0) MJ[#Gq\0R Print "" W5?F?Dp!v Print "Sample name: " & Chr(9) & sampName k;:v~7VF -bo2"*|m 'Open an output file and write the FRED header data ByeyUw Dim outFile As String F.?`<7 outFile = cDir & sampName & "_FRED.txt" sChMIbq!Av Open outFile For Output As #1 /h%<e Print #1, "type bsdf_data" %[ 4/UD=7 Print #1, "format angles=deg bsdf=value scale=1" 5gW`;Cdbyc xEaRuH c 'Loop the file list, skip the two header lines and write the remaining data to file 8):I< }s# Dim lineArray() As String, curLine As Long i0,{*LD%^ For Each curFile In fList ?UQVmE& Print "Merging data from file " & curFile 8YraW| H ReadFile( cDir & curFile, lineArray ) oM-{)rvQd For curLine = 2 To UBound(lineArray) ([UuO}m- Print #1, lineArray(curLine) )gV+BHK Next lDV8< Next j11 \t /dhx +K~ 'Close the output file JU:!lyd Close #1 zB\g'F/ KgVit+4u/ Print "Finished merging RPC data for sample " & sampName ]>/YU*\ Print "FRED formatted data file: " & Chr(9) & outFile [y}/QPR End Sub ]R}#3(]1 YS,kjL/ 'Utility function to read the contents of a file into an array of strings. <1&kCfE& Function ReadFile(ByVal fileName As String, _ #NNj# ByRef lineArray() As String) As Long .=rv,PWjZ [e3|yE6 ReadFile = -1 L@S"c
( Dim oFSO As Object 5}9-)\8=z Set oFSO = CreateObject("Scripting.FileSystemObject") [6 wI22 Erase lineArray 3XY$w&