RPC Photonics扩散片BSDF
摘要: mJd8?d vol (%wB 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。 >'=9sCi Ake l .& 背景: M6quPj 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。 Het>G{ 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。 6Y6t.j0vN.
图1. RPC Photonics工程漫射体结构及光束投射形状 ,Xn%0] ollVg/z AqQ5L>:Gq 步骤 _qk&W_u iD%a;] 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。 nL[OwfPj A /c
图2. RPC Photonics工程漫射体不同类型的散射数据 *' es(]W 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) q^6#.} 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 A7XA?>~+| 例如下所示: lTN^c? Sample name: EDF-C1-56 3LJ\y Merging data from file EDF-C1-56 0-0.txt MQcIH2 Finished merging RPC data for sample EDF-C1-56 z19%!k FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt $%ND5uK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P_mP ^L a. 创建一个新的散射库 I*JJvqh b. 散射模型命名 AY"wEyNU c. 改变散射模型为“Tabulated BSDF”. Sfc,F8$&N 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 ) [AIqKyIr 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。 65U\;Ew 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, 2'OY,Ooe g. 点击OK LfU? 1:Du 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s:_j,/H0A} t5i58@{~ %qE"A6j 脚本代码: W?!rqo2SP 9C Ki$L '#Language "WWB-COM" wL]#]DiE 6@47%%,} Option Explicit Ay^P#\VZ |=~mRqG Sub Main cD!E.2[ PA*k| 'Cleanup t;PG ClearOutputWindow() 2u5\tp?8 {(asy}a9K Print "Merging RPC Photonics BSDF Data Files" n)D SetTextColor(255,0,0) omPxU2Jw Print "Note: Script should be located in the same folder as the BSDF TXT files." 73]t5=D: Print "Note: Do not run this script multiple times without deleting the output file between executions." T*C
F5S SetTextColor(0,0,0) 5&_")k3$* iPG:w+G 'Current directory of this script (should be the same as the text files being merged) n_Y7*3/b-o Dim cDir As String uTJ z"c`F cDir = MacroDir$ & "\" *:un+k o
/1+
}f 'Array which will be populated with the list of files to be merged &
@_PY Dim fList() As String, curFile As String `)KGajB GetFileList( cDir, fList ) 8:*ZuR|~ D^p)`* Print "" vpdPW %B Print "Files found for merging:" 9`VY)"rJ For Each curFile In fList luac Print Chr(9) & curFile 7Lj:m.0O^ Next ]c|JxgU SfrM|o 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. I0x;rP Dim nameArray() As String, sampName As String Qgf|obrEi6 nameArray = Split(fList(0)," 0-0.txt") t,0}}9%? sampName = nameArray(0) +;pw^QB Print "" (Nd)$Oq[4 Print "Sample name: " & Chr(9) & sampName +!nf?5; vgg)f~ 'Open an output file and write the FRED header data MY z!zI Dim outFile As String ePaC8sd0 outFile = cDir & sampName & "_FRED.txt" 3A~<|<}t Open outFile For Output As #1 ]-a/)8 Print #1, "type bsdf_data" 'gD./|Z0 Print #1, "format angles=deg bsdf=value scale=1" \LQZoD?W 'IVC!uL,% 'Loop the file list, skip the two header lines and write the remaining data to file Iue=\qUK^ Dim lineArray() As String, curLine As Long X>o*eN For Each curFile In fList 4 CiRh Print "Merging data from file " & curFile Q.V@Sawe5 ReadFile( cDir & curFile, lineArray ) 4 2,dHYdt For curLine = 2 To UBound(lineArray) l>BM}hS Print #1, lineArray(curLine) yiH;fK +x Next rTJqw@]#WH Next | "M1+(k7 9o P 'Close the output file n<b}6L} Close #1 !mwMSkkq 8 K)GH:a Print "Finished merging RPC data for sample " & sampName 0 A8G8^T Print "FRED formatted data file: " & Chr(9) & outFile _ogN
End Sub asy:[r" 9q&~!>lt 'Utility function to read the contents of a file into an array of strings. WHLTJ]OB Function ReadFile(ByVal fileName As String, _ S?D]P'< ByRef lineArray() As String) As Long V! TGFo} "^
dMCS@ ReadFile = -1 k{|>!(Ax Dim oFSO As Object qAlX#] Set oFSO = CreateObject("Scripting.FileSystemObject") Z3u6m0! Erase lineArray A%&lW9z7 Su
+<mW Dim fid As Long mT|r:Yr: If oFSO.fileexists( fileName ) Then
y0) mBCX fid = FreeFile() [{vX*q
3B Open fileName For Input As fid .;,,{; lineArray = Split(Input(LOF(fid), fid), vbCrLf) v9f%IE4fX Close fid +I*a=qjq End If t)O]0)
s Set oFSO = Nothing @cx#' Return UBound( lineArray ) W!=ur,F+ v=&xiw |