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A8/YoU} 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,wN@Nk yU,xcq~l 背景: |`wsKr' 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。 K"7;Y#1g 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。 AF]!wUKxy 图1. RPC Photonics工程漫射体结构及光束投射形状 P*`xiTA Q/)ok$A& on?/tHys 步骤 4/?}xD|? KVxb"|[ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 % Au$E&sj % VpBB 图2. RPC Photonics工程漫射体不同类型的散射数据 ~qxXou,J 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) ?4e6w 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 l-}5@D[ 例如下所示: z \>X[yNpA Sample name: EDF-C1-56 $?AA"Nz Merging data from file EDF-C1-56 0-0.txt @T1+b"TC Finished merging RPC data for sample EDF-C1-56 ]31XX= FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9ox|.68q 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0WE1}.J< a. 创建一个新的散射库 W'h0Zg b. 散射模型命名 ^85n9a?8 c. 改变散射模型为“Tabulated BSDF”. FJ8@b d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) @jSbMI e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 d`uO7jlm f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, y[6&46r7D g. 点击OK ++DQS9b{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 yr2L puN=OX}C u#WTh%/ 脚本代码: T% 13 ' 5!jNL~M '#Language "WWB-COM" Yc`j 6\fMzm
Option Explicit kN|5
J ,GkW. vEU Sub Main ikN!ut 68<Z\WP 'Cleanup rn:zKTyhw ClearOutputWindow() \UqS -j| 4:&qTY)H Print "Merging RPC Photonics BSDF Data Files" HJaw\zbL SetTextColor(255,0,0) a`b zFu{ Print "Note: Script should be located in the same folder as the BSDF TXT files." )|y2Q Print "Note: Do not run this script multiple times without deleting the output file between executions." }?]yxa ~ SetTextColor(0,0,0) uO@3vY',n hr4ye`c j 'Current directory of this script (should be the same as the text files being merged) x2;i<
| Dim cDir As String >q@Sd cDir = MacroDir$ & "\" 1Uemsx%'k FaE #\Q 'Array which will be populated with the list of files to be merged 6QLQ1k` Dim fList() As String, curFile As String }"?nU4q;S GetFileList( cDir, fList ) 51G=RYay9 fA_%8CjI Print "" KBw9( Print "Files found for merging:" R G0S For Each curFile In fList }PQSCl^I Print Chr(9) & curFile PN"8 Y Next 4Kn9*V sCtw30BL 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3<Z'F}lg Dim nameArray() As String, sampName As String ]TBtLU3 nameArray = Split(fList(0)," 0-0.txt") mw(c[.*% sampName = nameArray(0) uR:=V9O Print "" hzQ+9-qA Print "Sample name: " & Chr(9) & sampName +rsl(
08FY {[,Wn: 'Open an output file and write the FRED header data %x}&=zx0*1 Dim outFile As String !/6\m!e|1R outFile = cDir & sampName & "_FRED.txt" UiR,^/8ED Open outFile For Output As #1 _+\:OB[Y Print #1, "type bsdf_data" ~llMrl7 Print #1, "format angles=deg bsdf=value scale=1" t1w2u.] xY2}Wr
j, 'Loop the file list, skip the two header lines and write the remaining data to file j&dx[4|m:h Dim lineArray() As String, curLine As Long UXwB$@8 For Each curFile In fList 97Zk
P=Cq Print "Merging data from file " & curFile gX$0[
sIS. ReadFile( cDir & curFile, lineArray ) jF2[bzY4 For curLine = 2 To UBound(lineArray) Y@]);MyL Print #1, lineArray(curLine) J3~hzgY Next '<%Nw-
Next =_8
UZk. =! N _^cb 'Close the output file U=F-]lD Close #1 B;GxfYj [A"H/Qztk Print "Finished merging RPC data for sample " & sampName Nmp>UE,7[ Print "FRED formatted data file: " & Chr(9) & outFile p@/(.uE End Sub ]-um\A4f 8
"_Bq 'Utility function to read the contents of a file into an array of strings. r(:
8!=~K Function ReadFile(ByVal fileName As String, _ 3>Q@r>c ByRef lineArray() As String) As Long ~V2ajM1Z&O ovd^,?ib ReadFile = -1 'Aj(i/CM Dim oFSO As Object -9OMn}w/* Set oFSO = CreateObject("Scripting.FileSystemObject") k,,!P"" Erase lineArray K85_>C%g b/sOfQ Dim fid As Long xH<'GB) If oFSO.fileexists( fileName ) Then :[Qp2Gg O\ fid = FreeFile() bZ>&QM Open fileName For Input As fid D=r- lineArray = Split(Input(LOF(fid), fid), vbCrLf) F!7f_m0= Close fid Opv1B2 End If CAUijMI@ Set oFSO = Nothing S3uyn78hI Return UBound( lineArray ) rI0)F VQ`,#`wV End Function uAu( +zV2 (8CCesy& Sub GetFileList( ByVal in_dir As String, _ [_WI8~gY ByRef in_flist() As String ) cMD RWh $sEB'>: 'Redimension the file list array \ Y*h Erase in_flist `n
3FT= 2)wAFO6u 'Tracks how many files are found 4~O6$;!|~ Dim fCount As Long \ V6
fCount = 0 ^ED"rMI K`hz
t 'Recurse directory and search for text files WP5VcBC Dim f As String br0u@G f = Dir$(in_dir & "*.txt") =G(*gx While f <> "" LGIalf*7 ReDim Preserve in_flist(fCount) >b>MKm>q in_flist(fCount) = f xC-BqVJ%_T fCount += 1 {Q)dU-\ f = Dir$() E{uf\Fc Wend jCzGus!rM ReDim Preserve in_flist(fCount-1) ^J8uhV;w (lb6]MtTHY End Sub Sv7 i! j
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