摘要: B.;@i;7L
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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。 j72mm! W=LJhCpRHj 背景: Z#(Y%6[u 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。 suW|hh1/Ya 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。 *QIYq 图1. RPC Photonics工程漫射体结构及光束投射形状
H+]h+K9\7 >j$aY /me ]sOkn 步骤 %g89eaEZ
1[#sHj$Na` 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。 &,:!gYN !<VP[%2L~ 图2. RPC Photonics工程漫射体不同类型的散射数据
yGrnzB6| 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) "L1LL
iS 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 bb\XZ~)F 例如下所示: ZU`~@.`i Sample name: EDF-C1-56 Bt5 P][< Merging data from file EDF-C1-56 0-0.txt rnp; R Finished merging RPC data for sample EDF-C1-56 [e@m-/B FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt A{k1MA<F6 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 8;c\}D a. 创建一个新的散射库 O@W/s!&lFa b. 散射模型命名 6#K.n&=* c. 改变散射模型为“Tabulated BSDF”. P>)J:.tr0 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 ) S~ S>62 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。 xfC$u`e= 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, T5e#Ll/ g. 点击OK XeY[;}9 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `d4xX@
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B 脚本代码: B]}gfVO *8;<w~ '#Language "WWB-COM" /-m) M"{*))O\-c Option Explicit @JLN3 Tz.okCo]z Sub Main #f_'&m "oFi+']* 'Cleanup s|c}9/Xe) ClearOutputWindow() =2DK?]K; +Zr~mwM=x Print "Merging RPC Photonics BSDF Data Files" w9RBT(u SetTextColor(255,0,0) uTPAf^| Print "Note: Script should be located in the same folder as the BSDF TXT files." =3SJl1w1 Print "Note: Do not run this script multiple times without deleting the output file between executions." J|be'V#]1 SetTextColor(0,0,0) f\q5{#"z ,L~aa?Nb- 'Current directory of this script (should be the same as the text files being merged) re#]zc< Dim cDir As String 5 $$Cav cDir = MacroDir$ & "\" 61&{I>~1 Lc[TIX 'Array which will be populated with the list of files to be merged OT=1doDp
Dim fList() As String, curFile As String Rbr:Q]zGN GetFileList( cDir, fList ) Y"KJ`Rx ^-n^IR}J Print "" n+Conp/ Print "Files found for merging:" #2:?N8vz* For Each curFile In fList yM9>)SE5` Print Chr(9) & curFile -r_\=<( Next z
j#<X O7LJ-M 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. KSEKoHJo Dim nameArray() As String, sampName As String f?GoBh< nameArray = Split(fList(0)," 0-0.txt") /-^J0f+l3 sampName = nameArray(0) 'W54 T Print "" KydAFxUb Print "Sample name: " & Chr(9) & sampName I?%q`GyP5 y!R9)=/M 'Open an output file and write the FRED header data K^tc]ZQ Dim outFile As String /YJBRU2 outFile = cDir & sampName & "_FRED.txt" )^4Ljb1 Open outFile For Output As #1 <&O*'
<6C Print #1, "type bsdf_data" mJ5%+.V Print #1, "format angles=deg bsdf=value scale=1" q(hBqU W eLXL5&}`fh 'Loop the file list, skip the two header lines and write the remaining data to file QkD]9#Id& Dim lineArray() As String, curLine As Long #r?[@aJ For Each curFile In fList xw_$1
S Print "Merging data from file " & curFile @]}/vsI m ReadFile( cDir & curFile, lineArray ) 8'TIDu For curLine = 2 To UBound(lineArray) dBovcc Print #1, lineArray(curLine) `nEqw/I Next GVn'p
Wg Next #8M^;4N>[ %{:pBt:Z 'Close the output file 7 H:y=?X6 Close #1 0YfmAF$/ B 0o6o<ggi Print "Finished merging RPC data for sample " & sampName 8@S]P0lk Print "FRED formatted data file: " & Chr(9) & outFile rLmc(-q End Sub ~Jsu"kr l7VTuVGUJ 'Utility function to read the contents of a file into an array of strings. t>*(v#WeZ Function ReadFile(ByVal fileName As String, _ 60A!Gob ByRef lineArray() As String) As Long 8<C@I/ dhJ=+Fz"w ReadFile = -1 l. l)w Dim oFSO As Object NYG!\u\Rm Set oFSO = CreateObject("Scripting.FileSystemObject") 5P\A++22Y Erase lineArray kv+^U^WoU |F<iu2\ Dim fid As Long /z`tI If oFSO.fileexists( fileName ) Then L;{{P7 fid = FreeFile() di9OQ*6a7 Open fileName For Input As fid eK*oV}U-k lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0_+
& [g} Close fid qIQ
61>< End If O#O"]A Set oFSO = Nothing Vmh$c*TE Return UBound( lineArray ) 7j&EQm5\9 ;E.f% End Function s] ;P< N1.1 Sub GetFileList( ByVal in_dir As String, _ \awkt!Wa ByRef in_flist() As String ) *f>\X[wN S&]r6ss 'Redimension the file list array Gx}`_[- Erase in_flist <]|HGc
kz6fU\U 'Tracks how many files are found Eaxsg Dim fCount As Long qP##C&+#q fCount = 0 cTRtMk%^ 2*#i/SE_ 'Recurse directory and search for text files U@n5:d= Dim f As String K`<HZK f = Dir$(in_dir & "*.txt") Hy,""Py While f <> "" 1-PlRQs.1 ReDim Preserve in_flist(fCount) }YM\IPsPu in_flist(fCount) = f @V5i fCount += 1 H8dS]N~[Y f = Dir$() Sj|tR[SAoD Wend soQ[Zg4} ReDim Preserve in_flist(fCount-1) g"m9[R=]6 t)?K@{ 9 End Sub ^EkxZ4*g N81M9#,["~
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