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摘要: |EuWzhNAO *Z*4L|zT 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。 ViqcJD &K@2kq, 背景: 9s\;,!b 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。 Fw!CssW 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。 W)I)QinOH 图1. RPC Photonics工程漫射体结构及光束投射形状 iGmBG1a\ ~C6Qp`VF J,ZvaF 步骤 3dG[dYj
1<RB} M 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。 z}v6!u|iZu "Gx(-NH+ 图2. RPC Photonics工程漫射体不同类型的散射数据 2x-67_BHY= 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) Zf~Em'g"3 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 W)^0~[`i 例如下所示: eC:?j`H- Sample name: EDF-C1-56 :d7Ju.*J Merging data from file EDF-C1-56 0-0.txt %jKbRiz1u Finished merging RPC data for sample EDF-C1-56 f8u m.Xnp6 FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt d4h1#MK 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 k
9 Xi|Yj a. 创建一个新的散射库 V=}AFGC85 b. 散射模型命名 |IL..C c. 改变散射模型为“Tabulated BSDF”. Iuk!A?XV 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 ) IHCEuK 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。 {f;] 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, T/Q#V)Tp g. 点击OK $OK}jSH*v) 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~Aul 7[IH 0` :B#ten rJ)O( 脚本代码: m'&^\7;D SS;[{u! '#Language "WWB-COM" K@u\^6419 dx{ZG'@aH Option Explicit 9$F '*{8 Qzbelt@Wx
Sub Main KTX;x2r >(Mu9ie*` 'Cleanup )*_4=-8H ClearOutputWindow() ).HYW _Yih _:4n&1{.E Print "Merging RPC Photonics BSDF Data Files" D^1H(y2zp SetTextColor(255,0,0) :|i jCg+ Print "Note: Script should be located in the same folder as the BSDF TXT files." w@U`@})r. Print "Note: Do not run this script multiple times without deleting the output file between executions." :_F$e SetTextColor(0,0,0) |,k,X}gP NsYeg&>` 'Current directory of this script (should be the same as the text files being merged) ln}2 Dim cDir As String 0^htwec! cDir = MacroDir$ & "\" "NqB_?DT {bB;TO<b` 'Array which will be populated with the list of files to be merged V<f76U) Dim fList() As String, curFile As String -xi]~svg GetFileList( cDir, fList ) noz&4"S.{ B 14Ziopww Print "" i6F`KF'i& Print "Files found for merging:" z Qtg]@S For Each curFile In fList -'
7I|r Print Chr(9) & curFile > D:(HWL Next 'LY.7cW tm27J8wPzV 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ?Y4$ Dim nameArray() As String, sampName As String RM2<%$ nameArray = Split(fList(0)," 0-0.txt") H% c:f sampName = nameArray(0) !o
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Print "" i^LLKx7M& Print "Sample name: " & Chr(9) & sampName fbaQXM u*/. 'Open an output file and write the FRED header data M7rVH\:[- Dim outFile As String '5j$wr zt outFile = cDir & sampName & "_FRED.txt" 0&!,+ Open outFile For Output As #1 "0al"? Print #1, "type bsdf_data" ^F@z+q Print #1, "format angles=deg bsdf=value scale=1" AN;SRl _G]f
v' 'Loop the file list, skip the two header lines and write the remaining data to file 3=(Gb Dim lineArray() As String, curLine As Long 96Kv! For Each curFile In fList E:,V{&tLK Print "Merging data from file " & curFile tY=sl_ ReadFile( cDir & curFile, lineArray ) ]=T`8)_r) For curLine = 2 To UBound(lineArray) <1~5l~ Print #1, lineArray(curLine) :sD/IM",}, Next lFMQT
; Next R~nbJx$ eq)8V x0 'Close the output file |y+<|fb,a Close #1 nZ>8r biZwxP3 Print "Finished merging RPC data for sample " & sampName A1{ 7g<k6 Print "FRED formatted data file: " & Chr(9) & outFile 'xO5Le(=M End Sub X.)caF^j pJ*x[y 'Utility function to read the contents of a file into an array of strings. gWcl@|I;\ Function ReadFile(ByVal fileName As String, _ s&-m!|P ByRef lineArray() As String) As Long `Oxo@G*@}W *m_B#~4 ReadFile = -1 1t" Dim oFSO As Object E3bS Q Set oFSO = CreateObject("Scripting.FileSystemObject") N;4tvWI Erase lineArray pa1.+ ~) D@5Ud)_ Dim fid As Long OV)J If oFSO.fileexists( fileName ) Then !KiN} p fid = FreeFile() D,FX&{TYU Open fileName For Input As fid G,+-}~ $_ lineArray = Split(Input(LOF(fid), fid), vbCrLf) >_9w4g_< Close fid .GG6wL<$? End If 4L'dV Set oFSO = Nothing g]B!
29M Return UBound( lineArray ) /:-8 ,` [v7)xV@c End Function [~cb&6|M ;9w:%c1 Sub GetFileList( ByVal in_dir As String, _ ".Lwq_ ByRef in_flist() As String ) !)1r{u {pEay|L_ 'Redimension the file list array ,9T-\)sT Erase in_flist .L;M-`^ i"eUacBz/- 'Tracks how many files are found MXy~kb& Dim fCount As Long y7[D9ZvZ fCount = 0 3C8cvi[IS ;0j 8Xj 'Recurse directory and search for text files S!*wK- Dim f As String Uy8r
!9O f = Dir$(in_dir & "*.txt") Ko6>h While f <> "" ";:"p6? ReDim Preserve in_flist(fCount) ]xhZJ~"@u in_flist(fCount) = f EJF*_<f9O fCount += 1 4.?tP7UE f = Dir$() 1A>>#M=A Wend O3Jp:.ps ReDim Preserve in_flist(fCount-1) qo2/? ]
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>@Gf End Sub CxyL'k
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