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摘要: mC}!;`$8p Vt!<.8&` RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 &RP}w%I1 |rbl sL2?Z 背景: %g<J"/ Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 -=A W. Zo FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 /-W-MP=Wd 图1. RPC Photonics工程漫射体结构及光束投射形状 P_w\d/3 0u"/7OU r
7mg>3 步骤 o-D,K dY yU@~UCmja 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 ]$vJK GK/Q]}Q8pZ 图2. RPC Photonics工程漫射体不同类型的散射数据 i;Y@>-[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) +L$,jZqS 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 8uO@S*)0 例如下所示: #Rkld v' Sample name: EDF-C1-56 'C9H6)Zq) Merging data from file EDF-C1-56 0-0.txt .u_k?.8| Finished merging RPC data for sample EDF-C1-56 /@H2m\vBX FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt !^|%Z 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 CY4_= a. 创建一个新的散射库 D-8>?`n\ b. 散射模型命名 %YaUc{.% c. 改变散射模型为“Tabulated BSDF”. @MV%&y*z. 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 ) 7(<49bb.V 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。 O&:0mpRZ 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, ^!*?vHx: g. 点击OK ` tkd1M 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 'ZHu=UT7_ Y,bw:vX YORFq9a{R 脚本代码: $DfaW3bJ FBGHVV
w! '#Language "WWB-COM" !vQ!_|g1 y%H;o?<WX Option Explicit @J~y_J{ jj)9jUz Sub Main :`Kr|3bQ %}=$HwN) 'Cleanup Hr$oT=x[ ClearOutputWindow() jz[|rwAp 9rb/h kX& Print "Merging RPC Photonics BSDF Data Files" $l&&y?() SetTextColor(255,0,0) /p
[l(H Print "Note: Script should be located in the same folder as the BSDF TXT files." ?CS
jn Print "Note: Do not run this script multiple times without deleting the output file between executions." @Y>3 -,o,S SetTextColor(0,0,0) ;UgRm# gkpNT) 'Current directory of this script (should be the same as the text files being merged) 1>*]jj} Dim cDir As String |zu>G9m cDir = MacroDir$ & "\" xaerMr NEO~|B*oDU 'Array which will be populated with the list of files to be merged lxK_+fj
q Dim fList() As String, curFile As String ,h2q37 GetFileList( cDir, fList ) tji,by#E/% @"s\eL,r Print ""
hh"0z] Print "Files found for merging:" )).;p_nLZ For Each curFile In fList Kfj*uzKB Print Chr(9) & curFile AEwb' Next h6x+.}} e>t9\vN#bx 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 04;y%~,}U/ Dim nameArray() As String, sampName As String $EJ*x$ nameArray = Split(fList(0)," 0-0.txt") !9"R4~4 sampName = nameArray(0) FGx_qBG4| Print "" YeJ95\jf Print "Sample name: " & Chr(9) & sampName +&\TdvNI4 fC3IxlG 'Open an output file and write the FRED header data IQ{Xj3;?y Dim outFile As String i,")U)b outFile = cDir & sampName & "_FRED.txt" 1TQ$(bI Open outFile For Output As #1 W7A'5 Print #1, "type bsdf_data" (r[<g*+3 Print #1, "format angles=deg bsdf=value scale=1" >`NY[Mn )O- x1U 'Loop the file list, skip the two header lines and write the remaining data to file /^[)JbgB Dim lineArray() As String, curLine As Long LO61J_J< For Each curFile In fList -e(2?Xq9 Print "Merging data from file " & curFile CHpDzG>]4 ReadFile( cDir & curFile, lineArray ) \ b9,> For curLine = 2 To UBound(lineArray) f9- |!]s Print #1, lineArray(curLine) 0D#!!r ; Next 0h shHv- Next TjI NxP-O 0HD1Ob^@ 'Close the output file ^y6Pkb
P Close #1 ,.`^Wx6F =w A< F Print "Finished merging RPC data for sample " & sampName g&0GO:F` Print "FRED formatted data file: " & Chr(9) & outFile 8)POEY4 End Sub paBGJ~{= T%a]3 'Utility function to read the contents of a file into an array of strings. b$R>GQ?# Function ReadFile(ByVal fileName As String, _ deTbvl ByRef lineArray() As String) As Long 9_>4~!x` 4}LF>_+= ReadFile = -1 bOz\-=au Dim oFSO As Object yL
Q&<\ Set oFSO = CreateObject("Scripting.FileSystemObject") C-Fp)Zs{0 Erase lineArray H9)uni H+5]3>O-$ Dim fid As Long h5F'eur If oFSO.fileexists( fileName ) Then *VlYl" fid = FreeFile()
?ha}# Open fileName For Input As fid ~$\j$/A8/ lineArray = Split(Input(LOF(fid), fid), vbCrLf) X3m?zQbhv Close fid ygfqP End If Fcr@Un' Set oFSO = Nothing c&Zm>Qo[
Return UBound( lineArray ) oNU* q.Q Lv^ j
l End Function ^p7( Awh"SUOh0 Sub GetFileList( ByVal in_dir As String, _ `X^e}EGWu ByRef in_flist() As String ) \34|9#*z- )(L&+DDy 'Redimension the file list array xRY5[=97 Erase in_flist Uqpvj90sw a;S^<8 'Tracks how many files are found wKeqR$ Dim fCount As Long |Gf{ } fCount = 0 KFs` u6 ]czy8n$+ 'Recurse directory and search for text files g^C6"rsnl Dim f As String A zle ;\l` f = Dir$(in_dir & "*.txt") oPbD9 While f <> "" XP` kf]9 ReDim Preserve in_flist(fCount) PjP%,-@1 in_flist(fCount) = f _N:h&uw fCount += 1 !xc7~D@om( f = Dir$() @Hf}PBb Wend jF;4
8g@^ ReDim Preserve in_flist(fCount-1) ~/x42|t j&Aq^aI End Sub \;6F-0 +i>q;=~ h[8y$.YsC QQ:2987619807 j%}Jl
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