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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。 xRTr<j0s KDt@Xi6|| 背景: t,CC~ 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。 {'(1c)q> 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。 DM*GvBdR 图1. RPC Photonics工程漫射体结构及光束投射形状
kTCWyc L\O}q -;VKtBXP</ 步骤 G{4~{{tI
[1Os.G2 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。 Yh^~4S? 6[iu CMOZ 图2. RPC Photonics工程漫射体不同类型的散射数据
BkZmE, 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) cwe@W PE2 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 HizMjJ| 例如下所示: c=
f_ Sample name: EDF-C1-56 hvc%6A\nm Merging data from file EDF-C1-56 0-0.txt -~wGJM
VA Finished merging RPC data for sample EDF-C1-56 L%3m_'6QP FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt iJIDx9 )Z 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 n_8wYiBs( a. 创建一个新的散射库 ^:c:~F6J b. 散射模型命名 >'qkW$-95 c. 改变散射模型为“Tabulated BSDF”. Gp<7i5 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 ) >
`uk2QdC 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。 {e>E4( 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, #5Zf6w g. 点击OK ]GSs{'UhB 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s:4<wmu4= `63?FzTy X?RnP3t~ 脚本代码: \5k^zGF4o &n5Lc` '#Language "WWB-COM" Iy2KOv@a5 qQL]3qP Option Explicit $U{\T4 ,g2oqq ? Sub Main vCPiT2G upD2vtU 'Cleanup 9}\{0;9 ClearOutputWindow() 2N,<~L`FX' .6@qU} Print "Merging RPC Photonics BSDF Data Files" ]i}3`e? SetTextColor(255,0,0) >:2B r(S Print "Note: Script should be located in the same folder as the BSDF TXT files." d#?.G3YmK Print "Note: Do not run this script multiple times without deleting the output file between executions." jK#[r[q{ SetTextColor(0,0,0) )^G&p[G
P[l? 'Current directory of this script (should be the same as the text files being merged) s@WF[S7D Dim cDir As String [c{/0* cDir = MacroDir$ & "\" > @Ux8# ` 0YI?$G1 'Array which will be populated with the list of files to be merged ws{2 0 Dim fList() As String, curFile As String kQr\ktN\ GetFileList( cDir, fList ) (A6-9g> <>jut Print "" Tug}P K Print "Files found for merging:" 5<?O S &B For Each curFile In fList (#4 Print Chr(9) & curFile ]yTMWIx# Next ql|ksios F<KUVe 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 9M$=X- Dim nameArray() As String, sampName As String NAy3Zd} nameArray = Split(fList(0)," 0-0.txt") :d&^//9 sampName = nameArray(0) ]5!}S-uJq Print "" L5E|1T Print "Sample name: " & Chr(9) & sampName t-xw=&!w hkSK; 'Open an output file and write the FRED header data *?k~n9n5U Dim outFile As String Lyx \ s; outFile = cDir & sampName & "_FRED.txt" :/Zy=F9: Open outFile For Output As #1 S 1%/ee3 Print #1, "type bsdf_data" S{v [65 Print #1, "format angles=deg bsdf=value scale=1" i.0}d5Y +) pO82 'Loop the file list, skip the two header lines and write the remaining data to file sC8C><y
Dim lineArray() As String, curLine As Long I?).D?o For Each curFile In fList ^Fy{Q*p`( Print "Merging data from file " & curFile l?+67cQLA ReadFile( cDir & curFile, lineArray ) MjO.s+I For curLine = 2 To UBound(lineArray) Vb=Oz Print #1, lineArray(curLine) mN_KAln Next 07zbx6:t Next g$++\%k& piZ0KA" 'Close the output file |@J:A! Close #1 CM ; r\,o @"`J~uK Print "Finished merging RPC data for sample " & sampName xMk0Xf'_ Print "FRED formatted data file: " & Chr(9) & outFile Cf-R?gn] End Sub vd@_LcK ^ Vl{IsY 'Utility function to read the contents of a file into an array of strings. QEl:>HG Function ReadFile(ByVal fileName As String, _ 4g}eqW ByRef lineArray() As String) As Long NJEubC? mk)F3[ke ReadFile = -1 __}j
{Buk Dim oFSO As Object F_m[EB Set oFSO = CreateObject("Scripting.FileSystemObject") 9=(*#gRd Erase lineArray ~ccwu K._tCB: Dim fid As Long u$7od$&S If oFSO.fileexists( fileName ) Then e8HGST` fid = FreeFile() _m;#+`E Open fileName For Input As fid P4{8pO]B lineArray = Split(Input(LOF(fid), fid), vbCrLf) _Y7uM6HL\ Close fid l{:7*U{d End If 3JB?G>\! Set oFSO = Nothing [25[c><:w" Return UBound( lineArray ) /8S g< {q9[0-LyJ End Function 7J~usF>A Ap&Bwo 8b Sub GetFileList( ByVal in_dir As String, _ /D]?+<