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摘要: Ug O \+cI R?%|RCht1 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。 1G8t=IA%D i%B$p0U< 背景: zwHTtE 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。 gwF@'Uu 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。 =WP}RZ{S 图1. RPC Photonics工程漫射体结构及光束投射形状 `V0]t_*D %}&9[# .^1=*j(; 步骤 Ix5yQgnB}j ?Z7C0u#wd 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。 G}~b %nc+VL4 图2. RPC Photonics工程漫射体不同类型的散射数据 8i"{GGVC 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) z#*GPA8Em: 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 17qrBG-/MD 例如下所示: kp;MNRc Sample name: EDF-C1-56 oq<# Merging data from file EDF-C1-56 0-0.txt q+G1#5 Finished merging RPC data for sample EDF-C1-56 +~/zCJ;F FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ZNA?`Z)f 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 khu,P[3> a. 创建一个新的散射库 Qg oXOVo6 b. 散射模型命名 "ChBcxvxb: c. 改变散射模型为“Tabulated BSDF”. ?
8!N{NV 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 ) x[oYN9O 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。 X:g5>is| 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, B'0Il"g' g. 点击OK n2O7n@8 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Em.? pcl_$2_ 3i$AR 脚本代码: p9sxA|O=y
6<~y!\4;F '#Language "WWB-COM" )*JTxMQ \)"qN^we Option Explicit Tp6ysjao BR%: `uiQ< Sub Main ]V]o%onW 5Np. & 'Cleanup 1-[{4{R ClearOutputWindow() &]c9}Ic ?3, * Print "Merging RPC Photonics BSDF Data Files" LOYv%9$0*p SetTextColor(255,0,0) (6+0U1[Iz Print "Note: Script should be located in the same folder as the BSDF TXT files." Tuy*Df Print "Note: Do not run this script multiple times without deleting the output file between executions." J)[(4R> SetTextColor(0,0,0) K^vMIo h J\0YL\jw1K 'Current directory of this script (should be the same as the text files being merged) WL~`L!_. A Dim cDir As String 6a!X`%N= cDir = MacroDir$ & "\" TPzoU"
qh JZ7-?
o 'Array which will be populated with the list of files to be merged x[kdQj2[& Dim fList() As String, curFile As String 5~?
J GetFileList( cDir, fList ) #WG(V%f] w/<hyEpxg Print "" A,/S/_Q= Print "Files found for merging:" @'y"D For Each curFile In fList ^YZ#P0 y Print Chr(9) & curFile M;bQid@BG Next `jkn*:m x/<.?[A 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. s_8!x Dim nameArray() As String, sampName As String \#}%E h
b nameArray = Split(fList(0)," 0-0.txt") /L
4WWQ5 sampName = nameArray(0) Glr.)PA Print "" w?C\YKF7 Print "Sample name: " & Chr(9) & sampName M/qiA.C@W "869n37 'Open an output file and write the FRED header data tpD?-`9o Dim outFile As String PTh
Ya outFile = cDir & sampName & "_FRED.txt" ]9:G3vq Open outFile For Output As #1 m}E$6E^~O Print #1, "type bsdf_data" -wt2ydzos Print #1, "format angles=deg bsdf=value scale=1" l]Sui_+ZU cG'Wh@ 'Loop the file list, skip the two header lines and write the remaining data to file YGO@X(ej, Dim lineArray() As String, curLine As Long 90!Ib~7zH For Each curFile In fList ^s*} 0 Print "Merging data from file " & curFile zl[JnVF\6 ReadFile( cDir & curFile, lineArray ) H#y"3E<s For curLine = 2 To UBound(lineArray) #wyS?FP- Print #1, lineArray(curLine) XTJ>y@ Next '9gI=/29D Next ao!r6:&v$e @!da1jN 'Close the output file *GhRU5 Close #1 @n(In$ 5dk,!Cjg Print "Finished merging RPC data for sample " & sampName UK,P?_e Print "FRED formatted data file: " & Chr(9) & outFile 4@I]PG End Sub v#FUD-Z /WfxI>v 'Utility function to read the contents of a file into an array of strings. _;{-w%Vf Function ReadFile(ByVal fileName As String, _ 86g+c ByRef lineArray() As String) As Long K;PpS*! Q/9b'^UJ ReadFile = -1 M)7enp) F. Dim oFSO As Object Q:\hh=^ Set oFSO = CreateObject("Scripting.FileSystemObject") 4o3GS8 Erase lineArray }t'^Au`X M}Mzm2d#` Dim fid As Long (% P=#vZ If oFSO.fileexists( fileName ) Then |_*$+ fid = FreeFile() 4/?Zp4g Open fileName For Input As fid s|'L0` <B lineArray = Split(Input(LOF(fid), fid), vbCrLf) v3Yj2LSqx Close fid ise}> A!t End If z<>_*Lfj Set oFSO = Nothing t^5_;sJQ Return UBound( lineArray ) }nl)*l W\7*T1TDj End Function M'iKk[Hjfx l0{DnQA>I Sub GetFileList( ByVal in_dir As String, _ Tt|6N*b' ByRef in_flist() As String ) <4,?lZ VHCzlg 'Redimension the file list array <*(R+to^d Erase in_flist "S:N-Tf%U w ZAXfNA 'Tracks how many files are found . $YF|v[= Dim fCount As Long >ULp! fCount = 0 ".?{Y(~ 1.uQ(>n 'Recurse directory and search for text files ;[ueNP%*y| Dim f As String Y +54z/{ f = Dir$(in_dir & "*.txt") KCE-6T While f <> "" ;r"B?] JO ReDim Preserve in_flist(fCount) ^;Q
pE in_flist(fCount) = f {2^@jD fCount += 1 C:MGi7f f = Dir$() +=Wdn)T Wend dy?|Q33Y" ReDim Preserve in_flist(fCount-1) ycD.:w p\' Els= :4 End Sub gq3OCA!cX ot#kU 8f z&,sm5Lb QQ:2987619807 e622{dfVS
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