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摘要: gaWJzK
Yc_ \\P*w$c RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 ;iO5
8S3 @MKf$O4K 背景: CLgfNrW~ 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。 2?nEHIUT 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。 2#Du5d 图1. RPC Photonics工程漫射体结构及光束投射形状 v(P5)R, vw6DHN)k qGdoRrp0Ov 步骤 #c$z&J7e 61Wh %8- 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 agd^ga3 oH;9s-Be 图2. RPC Photonics工程漫射体不同类型的散射数据 0b}.!k9 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) v2Vmcc_]9x 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Eg(.L,dj 例如下所示: VQ8Q=!] Sample name: EDF-C1-56 +?v2MsF'] Merging data from file EDF-C1-56 0-0.txt 9@>Q7AUCQ Finished merging RPC data for sample EDF-C1-56 ,}/6Za FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt *~kHH 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ?$.JgG%Z+g a. 创建一个新的散射库 c0Yc~&RF b. 散射模型命名 |3G;Rh9w, c. 改变散射模型为“Tabulated BSDF”. p :zRgwcn 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 ) &AnWMFo 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。 r2m&z%N& 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, a=
(v S g. 点击OK +-NH
4vUg 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 uxlrJ1~M ldt]=Sqy K(#O@Wmjq 脚本代码: dWP<,Z> RMHJI6?LB '#Language "WWB-COM" zy`T!
$ qIwsK\^p Option Explicit ;)q"X>FMZe rgF4 W8 Sub Main 4{ [d '-H5 =wlPm5 'Cleanup 9qvl9,*g ClearOutputWindow() ;KgDVq5 ;tC$O~X Print "Merging RPC Photonics BSDF Data Files" 0ax;Q[z2 SetTextColor(255,0,0) JnLF61 Print "Note: Script should be located in the same folder as the BSDF TXT files." |t~*!0>3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 06e dVIRr SetTextColor(0,0,0) 0YAH[YF m(`O>zS 'Current directory of this script (should be the same as the text files being merged) [lGxys)J Dim cDir As String aU*}.{<! cDir = MacroDir$ & "\" #,h0K 9.B gsV . 'Array which will be populated with the list of files to be merged kK:U+`+ Dim fList() As String, curFile As String JCci*F#r GetFileList( cDir, fList ) 5?m4B:W fr`Q
5!0 Print "" ~ ReX$9 Print "Files found for merging:" Ol;DJV For Each curFile In fList uU=!e&3 Print Chr(9) & curFile S6Y:Z0 Next 2I283%xr =#vJqA 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. e*Y<m\* Dim nameArray() As String, sampName As String 0U8'dYf nameArray = Split(fList(0)," 0-0.txt") / ;+Mz* sampName = nameArray(0) Z!3R Print "" &Q* 7 Print "Sample name: " & Chr(9) & sampName qkqtPbQ 7 Dus!Ki~8(t 'Open an output file and write the FRED header data ]Y@_ 2` Dim outFile As String b,X+*hRt outFile = cDir & sampName & "_FRED.txt" }<zbx*! Open outFile For Output As #1 Tn9Fg7< Print #1, "type bsdf_data" Bg}l$?S Print #1, "format angles=deg bsdf=value scale=1" 33&l.[A"!} +X`&VO6~ 'Loop the file list, skip the two header lines and write the remaining data to file Ze <)B
* Dim lineArray() As String, curLine As Long
: 76zRF For Each curFile In fList =~5N/! Print "Merging data from file " & curFile hM[3l1o{| ReadFile( cDir & curFile, lineArray ) jib pZ) For curLine = 2 To UBound(lineArray) w OOu/Y Print #1, lineArray(curLine) E#,\[<pc Next 4sW'pH Next UA(4mbz+ Z}{]/=h 'Close the output file efE=5%O Close #1 } =Xlac_U GFju:8P? Print "Finished merging RPC data for sample " & sampName OZC
yg/K Print "FRED formatted data file: " & Chr(9) & outFile I0qJr2[X~ End Sub q|0l>DPRp jT!?lqr(Rb 'Utility function to read the contents of a file into an array of strings. ^qi+Y)dU| Function ReadFile(ByVal fileName As String, _ 62MQ+H ByRef lineArray() As String) As Long }Q@~_3,UJ uUV"86B_ ReadFile = -1 +25=u|#4r Dim oFSO As Object R.DUfU"gp Set oFSO = CreateObject("Scripting.FileSystemObject") >; tE.CJH Erase lineArray OCq5}%yU&i &SNH1b#>E Dim fid As Long G:y+yE4 If oFSO.fileexists( fileName ) Then '$eJATtC fid = FreeFile() 29CzG0?B Open fileName For Input As fid 0Lb{HLT lineArray = Split(Input(LOF(fid), fid), vbCrLf) c{ +bY.J Close fid 7WUvO End If ALcPbr Set oFSO = Nothing 42p1P6d Return UBound( lineArray ) UvM4-M%2JN h&n1}W+ End Function xRdx`
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`*" Sub GetFileList( ByVal in_dir As String, _ y/kB`Z(Yj ByRef in_flist() As String ) NUJ $)qNA L[A?W 'Redimension the file list array }/h&`0z` Erase in_flist :Ocw+X3 Lis>Qr 'Tracks how many files are found ^\kH^ Dim fCount As Long M] +.xo+A fCount = 0 ez.a 6GPI
gPL, 'Recurse directory and search for text files mQR9Pn}H Dim f As String Jp%5qBS^ f = Dir$(in_dir & "*.txt") z1
MT@G)S$ While f <> "" +
d 3 ReDim Preserve in_flist(fCount) &:IcwD& in_flist(fCount) = f gujP{Z fCount += 1 .Gvk5Wn f = Dir$() mF|KjX~s Wend :=TIq ReDim Preserve in_flist(fCount-1) U8y?S]}vo \G7F/$g End Sub A<"<DDy
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