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摘要: Iff9'TE YV=QF
J' 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。 vVGDDDz/ r&-m=Kk$ 背景: 'mI'dG 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。 Vcd.mE(t% 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。 2Q;9G6p 图1. RPC Photonics工程漫射体结构及光束投射形状
2VW}9O at2FmBdu C H>r!i4l 步骤 :akT 'q# 0$r^C6}f 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 !lo/xQ< .^J2.>. 图2. RPC Photonics工程漫射体不同类型的散射数据 !w
BJ,&E 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ,C3,TkA] 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 4k./(f2+ 例如下所示: c8Z wr]DF Sample name: EDF-C1-56 tabT0 Merging data from file EDF-C1-56 0-0.txt 8Sz})UZ Finished merging RPC data for sample EDF-C1-56 fnx-s{c? FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt [qsEUc+Z.' 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 O-)-YVU a. 创建一个新的散射库 IK*07h/! b. 散射模型命名 +{sqcr1G c. 改变散射模型为“Tabulated BSDF”. x@8a'' d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) /VG2.: e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 6(PM'@i f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, `6+"Z=: g. 点击OK hy|b6wF& 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 OR[{PU=X 8,dBl!G= e%W$*f 脚本代码: ^*fQX1h< 'vN G(h#%d '#Language "WWB-COM" }@.|?2b + 8QMPY[{ Option Explicit e{Z &d
YJ$1N!rG Sub Main q+,Q<2J ^pHq66d%Z 'Cleanup Sp@-p9# ClearOutputWindow() ;;&}5jcV sVex
(X Print "Merging RPC Photonics BSDF Data Files" v+99
-. SetTextColor(255,0,0) y(K"
-? Print "Note: Script should be located in the same folder as the BSDF TXT files." 0Won9P Print "Note: Do not run this script multiple times without deleting the output file between executions." O*#*%RL| SetTextColor(0,0,0) 6AocmR0D' _UuC,Pl3 'Current directory of this script (should be the same as the text files being merged) 47J5oPT2' Dim cDir As String 7`u$ cDir = MacroDir$ & "\" irjP>3_e 4*$G & TX 'Array which will be populated with the list of files to be merged ->N8#XH2= Dim fList() As String, curFile As String sJNFFOz GetFileList( cDir, fList ) {z|;Xi::" +
nF'a( Print "" ;| 1$Q!4 Print "Files found for merging:" NVRLrJWpp For Each curFile In fList u{L!n$D7 Print Chr(9) & curFile 3po:xMY Next Z(Jt~a3o m^qBxA 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. _o8?E&d Dim nameArray() As String, sampName As String /&4U6a nameArray = Split(fList(0)," 0-0.txt") bJD;>"* sampName = nameArray(0) -44l^}_u Print "" Vx-7\NB Print "Sample name: " & Chr(9) & sampName i&n'N8D@ ]kboG%Dl?9 'Open an output file and write the FRED header data }}<z/zN&^ Dim outFile As String --DoB=5%8 outFile = cDir & sampName & "_FRED.txt" ^b
%0B Open outFile For Output As #1 G+F:99A Print #1, "type bsdf_data" sq'Pyz[[ Print #1, "format angles=deg bsdf=value scale=1" Q`D_|L 4ni3kmvX 'Loop the file list, skip the two header lines and write the remaining data to file p'om- Dim lineArray() As String, curLine As Long aFLO{t r` For Each curFile In fList H$6`{lx, Print "Merging data from file " & curFile 1x,tu}<u^ ReadFile( cDir & curFile, lineArray ) //aF5:Y# For curLine = 2 To UBound(lineArray) 4
uQT5 Print #1, lineArray(curLine) ZzX~&95G Next ."Y
e\>k Next {`w;39$+ S.a% 'Close the output file M.>l#4s,' Close #1 Ox@P6|m e zOj+vz Print "Finished merging RPC data for sample " & sampName )l#E}Uz Print "FRED formatted data file: " & Chr(9) & outFile {*ob_oc End Sub [
I/<_AT# }RP@!= 'Utility function to read the contents of a file into an array of strings. I&YSQK:b Function ReadFile(ByVal fileName As String, _ uyY|v$FM ByRef lineArray() As String) As Long fYW6b[lI -neKuj
ReadFile = -1 [VWUqlNt> Dim oFSO As Object kTvd+TP4 Set oFSO = CreateObject("Scripting.FileSystemObject") x@Hc@R<! Erase lineArray 3@]SKfoo1 LWt&3
Dim fid As Long &ZQJ>#~j^ If oFSO.fileexists( fileName ) Then fS`$'BQ fid = FreeFile() -xP!" Open fileName For Input As fid .e3+s* lineArray = Split(Input(LOF(fid), fid), vbCrLf) >&U,co$> Close fid \oZ5JoO End If J.|+ID+ Set oFSO = Nothing 9tqF8pb7v Return UBound( lineArray ) _hk.2FV:3m a.zpp'cEb End Function 7!N2-6GV $O5UyKI Sub GetFileList( ByVal in_dir As String, _ wLH] <k ByRef in_flist() As String ) Alxx[l\<J E^SH\5B 'Redimension the file list array Pp5^@A Erase in_flist NW&b&o Ho
*AAg 'Tracks how many files are found @#-q^}3 Dim fCount As Long X'"SVO. fCount = 0 `FC( RnDt)3 'Recurse directory and search for text files ih;]nJ]+- Dim f As String Kp,M"Y f = Dir$(in_dir & "*.txt") fP `b>]N_ While f <> "" J":,Vd!*- ReDim Preserve in_flist(fCount) $
<#KA3o\ in_flist(fCount) = f HF.^ysI fCount += 1 go<W( ,O f = Dir$() 1{r)L{] Wend q+vx_4 ReDim Preserve in_flist(fCount-1) yu/`h5&* Zc`BiLzrIG End Sub M )2`+/4
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