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摘要: Zc~7R`v7} OmWEa 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。 ^ l]!'" G:$kGzhJ 背景: =exCpW> 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。 "73y}' 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。 N
{
oVz], 图1. RPC Photonics工程漫射体结构及光束投射形状 $"/l*H\h ^ul1{ <9fXf* 步骤 JL87a^ro 3/n?g7B 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。 cl^UFlf[ 9t\14tVwx 图2. RPC Photonics工程漫射体不同类型的散射数据 /C!~v!;e 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) w ea 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 2v ~8fr4 例如下所示: 1sj7]G]`k Sample name: EDF-C1-56 @9 S :: Merging data from file EDF-C1-56 0-0.txt }VJ>}i* Finished merging RPC data for sample EDF-C1-56 VX.LL
5 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt EWDsBNZaI 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 49*f=gpGj2 a. 创建一个新的散射库 Q;3`T7 b. 散射模型命名 n>.@@ c. 改变散射模型为“Tabulated BSDF”. \ 2y/: 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 ) *bFWNJ}`q 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。 S,:!H@~B 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, wd*B3 g. 点击OK ZiuD0#"! 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7/<~s]D[% GW>F:<p <<d # 脚本代码: kQ\ $0=6N9 ZXQ5fBx '#Language "WWB-COM" 3'.3RKV rogy`mh\r2 Option Explicit Lf%3-P @~hy'6/ Sub Main Lld45Bayb
}>@SyE'Q 'Cleanup Jp"29
)w ClearOutputWindow() eWv:wNouk O/#3QK Print "Merging RPC Photonics BSDF Data Files" BT[|f[1 SetTextColor(255,0,0) ASy?^Jrs5 Print "Note: Script should be located in the same folder as the BSDF TXT files." apm%\dN Print "Note: Do not run this script multiple times without deleting the output file between executions." GZaB z#U SetTextColor(0,0,0) |E6_TZ#= Ne<S_u2nT 'Current directory of this script (should be the same as the text files being merged) y$7Ys:R~ Dim cDir As String >A{Dpsi\ cDir = MacroDir$ & "\" UeFJ5n'x: -hnNaA 'Array which will be populated with the list of files to be merged ldTXW(^j Dim fList() As String, curFile As String Rf4K Rhi GetFileList( cDir, fList ) H3$py|}lL #w|v.35%? Print "" F,S)P`? Print "Files found for merging:" b(N\R_IQ~ For Each curFile In fList ShC$ue?Q Print Chr(9) & curFile z**2-4 z Next w3q'n% *CXc{{ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. h9 DUS,G9, Dim nameArray() As String, sampName As String F&!vtlV) nameArray = Split(fList(0)," 0-0.txt") cy@Ri# sampName = nameArray(0) sTP\} Print "" t!3s@ Print "Sample name: " & Chr(9) & sampName R4 eu,,J 39O rY 'Open an output file and write the FRED header data 4Lg
,J9 Dim outFile As String I\_2=mL outFile = cDir & sampName & "_FRED.txt" 99*k&mb Open outFile For Output As #1 py\:u5QS Print #1, "type bsdf_data" $)NS]wJ]3 Print #1, "format angles=deg bsdf=value scale=1" sm'_0EUg `>UUdv{C 'Loop the file list, skip the two header lines and write the remaining data to file v@ QnS Dim lineArray() As String, curLine As Long N4,oO H~ For Each curFile In fList mOj; 0 R Print "Merging data from file " & curFile Q(-&}cY ReadFile( cDir & curFile, lineArray )
Z:^#9D{ For curLine = 2 To UBound(lineArray) IH=$
wc Print #1, lineArray(curLine) +pG+ xI Next =5*Wu+S4r Next pnSKIn
^cw9Yjh6 'Close the output file &!4E3&+2m Close #1 EGgw#JAi#t v\|jkzR5Y Print "Finished merging RPC data for sample " & sampName rK'Lvt@w Print "FRED formatted data file: " & Chr(9) & outFile hK)'dG* End Sub (U#,; (bv{17K 'Utility function to read the contents of a file into an array of strings. octQ[QXo# Function ReadFile(ByVal fileName As String, _ RK-bsf ByRef lineArray() As String) As Long O^CBa$ tf 7HhOCYX ReadFile = -1 mW!n%f Dim oFSO As Object k^|z.$+ Set oFSO = CreateObject("Scripting.FileSystemObject") !HU$V9C Erase lineArray Htr]_<@ {.k IC@^O Dim fid As Long wipl5O@L If oFSO.fileexists( fileName ) Then !%M,x~H fid = FreeFile() u-&V |