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摘要: q=Q5s?sQc ps^Z)x`GV 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。 ?tg(X[h{S cC b'z1 背景: PG+ICg 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。 mQ:lj$Gf FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 u 6$fF= 图1. RPC Photonics工程漫射体结构及光束投射形状 j)]mN$Sa: I~gU3( CZuV{Oh}? 步骤 aU4v-9@U8 #iJ+}EW
_ 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 XSkx<"U* #0zMPh /U} 图2. RPC Photonics工程漫射体不同类型的散射数据 wspZ Eu>C; 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) 2<y!3OeN 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 2aNCcZw0 例如下所示: %lF}! Sample name: EDF-C1-56
:RBp Merging data from file EDF-C1-56 0-0.txt 9|jk=`4UK Finished merging RPC data for sample EDF-C1-56 * _)xlpy FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt +vY8HQ|v 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /4}{SE a. 创建一个新的散射库 A(S = b. 散射模型命名 URz$hcI8 c. 改变散射模型为“Tabulated BSDF”. tF}Vs} 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 ) ?ey!wcv~ 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。 @zSI@Oq_ 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, vN=e1\ g. 点击OK cy%JJ)sf 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =87.6Ai |1iCt1~U -!zyit5B 脚本代码: bL v_<\:m E2+x?Sc+ '#Language "WWB-COM" 5Arx"=c MBXja#(k Option Explicit U>PF#@ C/ k<x
% Sub Main f4eLnY j5QS/3 'Cleanup 8#b>4Dx ClearOutputWindow() 7UM!<@9\ t F^|,9_< Print "Merging RPC Photonics BSDF Data Files" ?ra6Lo SetTextColor(255,0,0) "9mJ$us Print "Note: Script should be located in the same folder as the BSDF TXT files." 2O}UVp> Print "Note: Do not run this script multiple times without deleting the output file between executions." H%2Y8} SetTextColor(0,0,0) N4y$$.uv2 QJ1_LJ4)a 'Current directory of this script (should be the same as the text files being merged) CtItzp Dim cDir As String pI*/-!I cDir = MacroDir$ & "\" NgH"jg- 2pa:
3O 'Array which will be populated with the list of files to be merged ,jVj9m Dim fList() As String, curFile As String _c|aRRW GetFileList( cDir, fList ) J<8~w; i 5<1,`Bq@ Print "" )<W6cDx'H+ Print "Files found for merging:" r2,AZ+4FP For Each curFile In fList 5G-)> Print Chr(9) & curFile X2ShxD| Next
&Uqm3z?v eO<:X|9T 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. MN|8(f5Gs Dim nameArray() As String, sampName As String $'M:H_T nameArray = Split(fList(0)," 0-0.txt") Id->F0x0 sampName = nameArray(0) %DJxUuh Print "" 6fxf|R\ Print "Sample name: " & Chr(9) & sampName E2f9J{Ki= \A-w,]9^V 'Open an output file and write the FRED header data Mk-C' Dim outFile As String G(piq4D outFile = cDir & sampName & "_FRED.txt" {eR,a-D!7 Open outFile For Output As #1 ;dq AmBG{8 Print #1, "type bsdf_data" RU`m|< Print #1, "format angles=deg bsdf=value scale=1" Umwd<o ti`R 'Loop the file list, skip the two header lines and write the remaining data to file 0q%=Vs~@g Dim lineArray() As String, curLine As Long eit>4xMu For Each curFile In fList wA`A+Z2*? Print "Merging data from file " & curFile eZ~^Z8F[6 ReadFile( cDir & curFile, lineArray ) Q7PqN1jTE For curLine = 2 To UBound(lineArray) gd9ZlHo'Id Print #1, lineArray(curLine) maANxSzi Next 22?9KZ`Z= Next h[d|y_)f H9)$ #r6i 'Close the output file Q"]C"? Close #1 fT.5@RR7^ B^(0>Da\ Print "Finished merging RPC data for sample " & sampName 5gq3 >qo Print "FRED formatted data file: " & Chr(9) & outFile z41
p$ End Sub |N[SCk>Kj 1{+Ni{ 'Utility function to read the contents of a file into an array of strings. Rkfr4 Function ReadFile(ByVal fileName As String, _ XQ:HH 8 ByRef lineArray() As String) As Long wxPg*R+t >*A\/Da]j ReadFile = -1 Y=/3_[G Dim oFSO As Object n15c1=gs Set oFSO = CreateObject("Scripting.FileSystemObject") 6m21Y8N Erase lineArray nM8aC&Rd\ "z^Ysvw&~ Dim fid As Long Q>}I@eyJ If oFSO.fileexists( fileName ) Then ;3'}(_n fid = FreeFile() iZ[o2Tre Open fileName For Input As fid +u_mT$|T lineArray = Split(Input(LOF(fid), fid), vbCrLf) R4}G@&Q Close fid @N.W#<IG End If 7 pg8kq@ Set oFSO = Nothing LnZz= Return UBound( lineArray ) 0*:]eM};P u4o%qK End Function -$WiB 4)9X) Qx Sub GetFileList( ByVal in_dir As String, _ IG +nrTY0 ByRef in_flist() As String ) UDyvTfh1X J+?xfg 'Redimension the file list array f{ S)wE>; Erase in_flist P9`i6H'~ ? dSrY 'Tracks how many files are found jy@}$g{ Dim fCount As Long KU33P>a"[k fCount = 0 :g<dwuVO ~n"V0!:'4 'Recurse directory and search for text files 0?,EteR Dim f As String W,Dr2$V f = Dir$(in_dir & "*.txt") WlZ[9,:p1 While f <> "" !c1
E ReDim Preserve in_flist(fCount) k~=-o>}C in_flist(fCount) = f %q>gwq
A fCount += 1 @gX@mT" f = Dir$() Mm.!$uR Wend z
eIBB ReDim Preserve in_flist(fCount-1) i-E&Y*\^9H k_}ICKzw1 End Sub d G:=tf&1R
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