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摘要: Pn@DHYP `pDTjJ 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。 s0x/2z -lv(@7o~ 背景: ~mK+Q%G5 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。 ;9 ChBA 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。 BOy&3.h5? 图1. RPC Photonics工程漫射体结构及光束投射形状 0u( 0*Xl b<"jmB{ eq&QWxiD* 步骤 K@Q%NK, cQBc6eAi 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。 n6Z!~W8 @k'V`ZQF 图2. RPC Photonics工程漫射体不同类型的散射数据 kw2d<I$] 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) :mf&,? 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 u.?jW vcv 例如下所示: 4"!kCUB Sample name: EDF-C1-56 IQ-l%x[fue Merging data from file EDF-C1-56 0-0.txt )z4eRs F| Finished merging RPC data for sample EDF-C1-56 w5/6+@} FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt >@4AxV\ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 cF9oo%3 a. 创建一个新的散射库 lHTr7uF( b. 散射模型命名 }ALli0n`V) c. 改变散射模型为“Tabulated BSDF”. FDGG$z?>m 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 ) BTG_c_?]e 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。 m9&%A0 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, 0E
(G1o' g. 点击OK YH^@8
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 X*5N&AJ R>;&4Sjr g4 +Hq * 脚本代码:
+`ov1h Bm%|WQK '#Language "WWB-COM" /nX_Q?mo w&J_c8S Option Explicit ~.0'v [N ^L7!lzyo Sub Main ) vVf- zU $}z/BV1I 'Cleanup h5-yhG ClearOutputWindow() h9iQn<lp4. F8Mf,jnPs Print "Merging RPC Photonics BSDF Data Files" m!P<#
|V SetTextColor(255,0,0) U^U
hZ! Print "Note: Script should be located in the same folder as the BSDF TXT files." 8.I3%u Print "Note: Do not run this script multiple times without deleting the output file between executions." :h3n[% SetTextColor(0,0,0) hk
S:_e= UA]fKi 'Current directory of this script (should be the same as the text files being merged) C=cn.CX Dim cDir As String <63TN`B cDir = MacroDir$ & "\" )/~o'M3 ucU7
@j 'Array which will be populated with the list of files to be merged ue'dI Dim fList() As String, curFile As String :$PrlE GetFileList( cDir, fList ) -"H0Qafm R(cg`8 Print "" eQn[ Print "Files found for merging:" KU+\fwYpnk For Each curFile In fList Z5)v Print Chr(9) & curFile &}pF6eIar Next Km,o+9?1gF u7Ix7`V 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. "Ehh9 m1& Dim nameArray() As String, sampName As String ?d{O'&|: nameArray = Split(fList(0)," 0-0.txt") nLv~)IQ}: sampName = nameArray(0) u=vBjaN2_w Print "" #e,TS`"eD Print "Sample name: " & Chr(9) & sampName (~E-=+R[$& /;1O9HJa 'Open an output file and write the FRED header data w9O!L9 6 Dim outFile As String U[8F{LX outFile = cDir & sampName & "_FRED.txt" 8c_X`0jy Open outFile For Output As #1 3G2iRr.o Print #1, "type bsdf_data" ^Qn:#O9 Print #1, "format angles=deg bsdf=value scale=1" r3-<~k- c=9A d 'Loop the file list, skip the two header lines and write the remaining data to file J]{<Z?% Dim lineArray() As String, curLine As Long 4m"0R\ For Each curFile In fList .cw)Y#;IG Print "Merging data from file " & curFile 1,Mm+_)B ReadFile( cDir & curFile, lineArray ) 2k^rZ^^" For curLine = 2 To UBound(lineArray) iF837ng5 Print #1, lineArray(curLine) M+HhTW;I= Next >D}|'.& Next ]*lZFP~ 6akI5\b 'Close the output file dC-~=}HR^ Close #1 4 dLnX3 v M6^
\LtFt Print "Finished merging RPC data for sample " & sampName ]FIIs58IM Print "FRED formatted data file: " & Chr(9) & outFile K9p<PLy+ End Sub NqNU:_} l}/&6hI+d 'Utility function to read the contents of a file into an array of strings. BnGoB`n Function ReadFile(ByVal fileName As String, _ '<uM\v^k ByRef lineArray() As String) As Long Gau@RX:O |O oczYf ReadFile = -1 %Q &'] Dim oFSO As Object nLG)>L Set oFSO = CreateObject("Scripting.FileSystemObject") {#4a}:3 Erase lineArray m{X{h4t 5$HG#2"Kb# Dim fid As Long y %61xA`# If oFSO.fileexists( fileName ) Then d,(q3 fid = FreeFile() {f)aFGp Open fileName For Input As fid dh [kx lineArray = Split(Input(LOF(fid), fid), vbCrLf) n8_X<jIp3 Close fid C/qKa[mg End If &ZkJ,- Set oFSO = Nothing [MwL=9;!H Return UBound( lineArray ) a=A12< 0a8\{(w End Function .KC V|x;QW GIc q|Pe Sub GetFileList( ByVal in_dir As String, _ L8f+uI ByRef in_flist() As String ) p5vQ.Ni*\- #0uu19+} 'Redimension the file list array X1a~l|$h Erase in_flist &oB*gGRw=7 U]vUa^nG 'Tracks how many files are found ?QJx!'Y,p Dim fCount As Long kc P ZIP: fCount = 0 rg
k1.0U0 Sk!' 2y*@& 'Recurse directory and search for text files ht ]n* Dim f As String L/-SWid) f = Dir$(in_dir & "*.txt") @<pd@Mpf] While f <> "" ~/-SKGzo- ReDim Preserve in_flist(fCount) r0lI&25w in_flist(fCount) = f SM
RKEPwp& fCount += 1 Y,Z$U| U f = Dir$() wzd(=*N Wend 0|tyKP|J ReDim Preserve in_flist(fCount-1) 2\k!DF 2#lpIj End Sub ]w;t0Bk 3!gz^[!?EN m[2[9bQ0 QQ:2987619807 ||pOiR5
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