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摘要: >dKK [E/[d RrrW0<Ed 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。 Z|;<:RKWY K$OxeJP?F 背景: $jT&]p Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 r_C|gfIP FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 =B4,H=7Spf 图1. RPC Photonics工程漫射体结构及光束投射形状 Gt#Jr!N~ Fe
3*pUt jv$Y]nf 步骤 I)#=#eI*: ?#8',: 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。 C
yg e kwxb~~S}h( 图2. RPC Photonics工程漫射体不同类型的散射数据 5/x"!Jk 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) U'^AJ2L8 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 :g)0-gN 例如下所示: 50!/% Sample name: EDF-C1-56 s ^NO( Merging data from file EDF-C1-56 0-0.txt hsV+?#I Finished merging RPC data for sample EDF-C1-56 we'<Y FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt hZGoiWC 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /H#- \r&r a. 创建一个新的散射库 []HMUL]" b. 散射模型命名 D|8vS8p c. 改变散射模型为“Tabulated BSDF”. gcYx-gA} 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 ) hUirvDvX 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。 H I/]s^aL 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, wMy$T<: g. 点击OK {\-rZb==F2 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 tX;00g;U. kPwgayz qz7:jq3N-{ 脚本代码: rfqw/o n}== '#Language "WWB-COM" w0QN5? 3wXmX Option Explicit =H*}{'# Enee\!@v Sub Main vW4~\] Ov3W;jD 'Cleanup (]wi^dE ClearOutputWindow() b *IJ + *S_e:^ Print "Merging RPC Photonics BSDF Data Files" %M8Egr2|0 SetTextColor(255,0,0) DO<eBq\O Print "Note: Script should be located in the same folder as the BSDF TXT files." _`lj
3Lm0> Print "Note: Do not run this script multiple times without deleting the output file between executions." AH`n SetTextColor(0,0,0) QX(x6y>Q KDwz!:ye 'Current directory of this script (should be the same as the text files being merged) * d6[kY Dim cDir As String f.V;Hl, cDir = MacroDir$ & "\" MLg<YL U$a Eby. 'Array which will be populated with the list of files to be merged 1|Y(XB^os( Dim fList() As String, curFile As String fr'M)ox1 GetFileList( cDir, fList ) I(BG%CO9 @C)O[&Sk Print "" 7L)1mB. Print "Files found for merging:" ^_4TDC~h For Each curFile In fList 1lyJ;6i6L Print Chr(9) & curFile 0
eZfHW& Next M9Gs^ K%LDOVE8e 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. xw: v|( Dim nameArray() As String, sampName As String Hv%(9)-8 nameArray = Split(fList(0)," 0-0.txt") }GvoQ#N sampName = nameArray(0) ;SQ<^"eK Print "" *Yv"lB8 Print "Sample name: " & Chr(9) & sampName !-
f>*|@ PpMZ-f@ 'Open an output file and write the FRED header data m1_?xU Dim outFile As String $w%oLI@kl outFile = cDir & sampName & "_FRED.txt" p>v,b&06 Open outFile For Output As #1 U`q[5U" Print #1, "type bsdf_data" E%eao$ Print #1, "format angles=deg bsdf=value scale=1" bHlG(1uf EQPZV
K/ 'Loop the file list, skip the two header lines and write the remaining data to file SCeZt [
Dim lineArray() As String, curLine As Long ANSv ZqKh For Each curFile In fList I Vy,A7f Print "Merging data from file " & curFile q3Umqvl)oe ReadFile( cDir & curFile, lineArray ) 6h>8^l For curLine = 2 To UBound(lineArray) THHrGvb Print #1, lineArray(curLine) Wm:3_C +j Next
H%7V)" Next kF'^!Hp 7ka^y k@Q 'Close the output file G B!3`
A%& Close #1 Y~1}B_ R7*Jb-;$! Print "Finished merging RPC data for sample " & sampName /Nq!^= Print "FRED formatted data file: " & Chr(9) & outFile ih`/1n End Sub ~l!(I-'?g !mBsDn(J 'Utility function to read the contents of a file into an array of strings. 0kgK~\^,.O Function ReadFile(ByVal fileName As String, _ LoHWkNZ5: ByRef lineArray() As String) As Long |Ix6D Bir}X ReadFile = -1 Y^LFJB|b4 Dim oFSO As Object 6bnAVTL5 Set oFSO = CreateObject("Scripting.FileSystemObject") yP0P-8 Erase lineArray 0!=e1_ !|_
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T| Dim fid As Long 9BI5qHEp If oFSO.fileexists( fileName ) Then XBhWj\`(T fid = FreeFile() &ukNzV}VW Open fileName For Input As fid )$q<"t\#P# lineArray = Split(Input(LOF(fid), fid), vbCrLf) V.WfP*~NJ Close fid 7qE V5! End If `Q26Dk Set oFSO = Nothing UEo,:zeN[ Return UBound( lineArray ) {N5g52MN *B}vYX End Function 'G(N,vu[@ :&yRvu Sub GetFileList( ByVal in_dir As String, _ ,b>cy&ut ByRef in_flist() As String ) }#!o^B8 CW\o>yh 'Redimension the file list array &Wd,l$P<O Erase in_flist '5ky< `^AbFV
3 'Tracks how many files are found #!#V!^ o Dim fCount As Long R'dF<&Kj| fCount = 0 k6JB%m\E ZfT%EPoZ: 'Recurse directory and search for text files } Q1$v~ Dim f As String vzi=[A f = Dir$(in_dir & "*.txt") QN_5q5 While f <> "" ?;)(O2p ReDim Preserve in_flist(fCount) >[|:cz in_flist(fCount) = f BCUw"R# fCount += 1
OD\x1,E)I f = Dir$() jLr8?Hyf Wend bG^eP:r ReDim Preserve in_flist(fCount-1) FGwz5@|E {(a@3m~a% End Sub ([f6\Pw\ < rA=F:N
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