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摘要: 3cfZ!E~^kc nUud?F^_ 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。 K;y\[2;}e, 2x`xyR_Q.R 背景: Wqs.oh 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。 0Dm`Ek3A7x 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。 c+b:K 图1. RPC Photonics工程漫射体结构及光束投射形状 H]i+o6 ;/";d]j =!S@tuY 步骤 F*4Qa ;;y@z[ > 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。 _N,KHxsG8B GATP 图2. RPC Photonics工程漫射体不同类型的散射数据 4-M6C 5#. 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) VJl &Bq+ 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 bm tJU3Rm 例如下所示: -wtTq
ph' Sample name: EDF-C1-56 &FJU%tFA Merging data from file EDF-C1-56 0-0.txt +A'q#~yILa Finished merging RPC data for sample EDF-C1-56 3\p]esse FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt HV*:<2P%D 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 F`;TU"pDf a. 创建一个新的散射库 K^,&ub.L) b. 散射模型命名 U|
41u4)D c. 改变散射模型为“Tabulated BSDF”. XgiI6-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 ) MOp=9d+N~ 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。 KtfkE\KP 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, !8
wid& g. 点击OK z6FbM^;; 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |%:qhs, S&
, Ju% tv@Z5 脚本代码: np`gcj# 2pxWv
)0 '#Language "WWB-COM" s=q%:uCO p-T~x$"c| Option Explicit ~4=]%XYz _cxm}*}\# Sub Main g/U$!d_ Lem\UD$D` 'Cleanup ,);=
(r9 ClearOutputWindow() K'iS#i7 ++T
"+p Print "Merging RPC Photonics BSDF Data Files" S<y>Y SetTextColor(255,0,0) d739UhKC Print "Note: Script should be located in the same folder as the BSDF TXT files." qXP1Q3 Print "Note: Do not run this script multiple times without deleting the output file between executions." w|
-0@ SetTextColor(0,0,0) EaM"=g k Z+ q 'Current directory of this script (should be the same as the text files being merged) 6:|!1Pg5 Dim cDir As String PEX26== cDir = MacroDir$ & "\" E !Oz|q nxn[ ~~ 'Array which will be populated with the list of files to be merged 1kvPiV=X> Dim fList() As String, curFile As String 3P+4S|@q(4 GetFileList( cDir, fList ) 'uP'P# Ad}-I%Ie Print "" `zElBD Print "Files found for merging:" OQytgXED For Each curFile In fList =RW*
%8C Print Chr(9) & curFile wc6
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Next 7~!I2DV_ zx\.2<K 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 6o[0sM_]; Dim nameArray() As String, sampName As String o ;[C(OS nameArray = Split(fList(0)," 0-0.txt") vCy.CN$ sampName = nameArray(0) \yJZvhUk Print "" u|_LR5S!j Print "Sample name: " & Chr(9) & sampName "fX_gN? "xe7Dl 'Open an output file and write the FRED header data dJdD"xj Dim outFile As String ]97Xu_ outFile = cDir & sampName & "_FRED.txt" 26\HV Open outFile For Output As #1 wo7N7R5 Print #1, "type bsdf_data" %gV)arwK Print #1, "format angles=deg bsdf=value scale=1" RJtixuvh@
Z #.GI 'Loop the file list, skip the two header lines and write the remaining data to file ql!5m\ Dim lineArray() As String, curLine As Long #6*V7@9]3| For Each curFile In fList Z-4K?;g'k Print "Merging data from file " & curFile -vv
ReadFile( cDir & curFile, lineArray ) *ajFZI For curLine = 2 To UBound(lineArray) [ E$$nNs Print #1, lineArray(curLine) ^Ei*M0fF Next `7u\
Next SKB@ th.M.jas 'Close the output file i>ESEmb- Close #1 cOzg/~\1 !pd7@FwC Print "Finished merging RPC data for sample " & sampName +L`V[; Print "FRED formatted data file: " & Chr(9) & outFile SjZd0H0 End Sub kN'|,eKH4 B]'e$uyL7 'Utility function to read the contents of a file into an array of strings. M,b<B_$ Function ReadFile(ByVal fileName As String, _ E0sbU<11 ByRef lineArray() As String) As Long K%Usjezv& Mq+viU&
ReadFile = -1 tpv?`(DDU Dim oFSO As Object >[Xm|A# Set oFSO = CreateObject("Scripting.FileSystemObject")
P\D[n-& Erase lineArray pd=7^"[}; ggrI>vaw Dim fid As Long /- DKV~ If oFSO.fileexists( fileName ) Then N+*(Y5TU fid = FreeFile() #Y;.>mF Open fileName For Input As fid ,DE(5iDS lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9|J8]m?x Close fid K&j'c End If ,$HHaoog Set oFSO = Nothing y\[L?Rmd Return UBound( lineArray ) vg+r?4Q3 PLO\L W End Function l0gH(28K =L:[cIRrT; Sub GetFileList( ByVal in_dir As String, _ |C~Sr#6)7 ByRef in_flist() As String ) &(lMm ) @) 'Redimension the file list array ~&lQNl3`m6 Erase in_flist z
VnIr<!8_ ?2H{^\<(e 'Tracks how many files are found 6o$Z0mG Dim fCount As Long Zkw J.SuU fCount = 0 9 1BY]N "\NF
'Recurse directory and search for text files Xyb8u})p' Dim f As String j1'\R+4U f = Dir$(in_dir & "*.txt") 8r5xs- While f <> "" CKJAZ 2 ReDim Preserve in_flist(fCount) g<M0|eX@~ in_flist(fCount) = f #N; $ fCount += 1 %rFP#L f = Dir$() S*;#'j)4+ Wend fW(; ReDim Preserve in_flist(fCount-1) Tsu\oJ[ CP}0Ri) End Sub DKR<W.!*t
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