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';V+~pi gJv^v`X 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。 (3*Hl 1 niTkop 背景: ~q>ilnL"h 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。 uV:;y}T^Z 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。 q|2C>{8 图1. RPC Photonics工程漫射体结构及光束投射形状 /L Tyiiz6 0g)mf6}o 9R3=h5Y 步骤 Agf!6kh GTe9@d 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。 U.x.gZRo[ l<6/ADuS 图2. RPC Photonics工程漫射体不同类型的散射数据 Uij$
eBN 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) (*gpa:Sc 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 m%3Kq%?O 例如下所示: F,:VL*.5kJ Sample name: EDF-C1-56 ]x\wP7x Merging data from file EDF-C1-56 0-0.txt ?g.w%Mf* Finished merging RPC data for sample EDF-C1-56 _ji%BwJ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt wH<* 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 jT0fF a. 创建一个新的散射库 ZQ/5]]}3y b. 散射模型命名 ']D( ({%g c. 改变散射模型为“Tabulated BSDF”. lU&IS?^? 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 ) jL1UPN 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。 fok#D>q 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, /#5ZP\e g. 点击OK p(>'4#|qy 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 jnY4(B
39CPFgi<l* 35T7g65; 脚本代码: CcQ|0 yhmW-#+^e '#Language "WWB-COM" E~Nr4vq bcf OpA Option Explicit k,& QcYw Af~AE2b3" Sub Main v/dcb% oJy/PR3 'Cleanup tWuQKN`_ ClearOutputWindow() =t2epIr5 E*vi@aI Print "Merging RPC Photonics BSDF Data Files" hZy*E [i SetTextColor(255,0,0) |99eDgK, Print "Note: Script should be located in the same folder as the BSDF TXT files." #s%$kYp 1 Print "Note: Do not run this script multiple times without deleting the output file between executions." xuF_^ SetTextColor(0,0,0) .v{ty XJ+sm^`vOf 'Current directory of this script (should be the same as the text files being merged) iatQHn>( Dim cDir As String pppbn]%Ob cDir = MacroDir$ & "\" o~B=[ /~:ztv\$M" 'Array which will be populated with the list of files to be merged $fKWB5p|() Dim fList() As String, curFile As String wSDDejg GetFileList( cDir, fList ) _U %B1s3y !O*n6}nPE Print "" Cpl)byb Print "Files found for merging:" "P~>AXcq For Each curFile In fList joq
;N]S Print Chr(9) & curFile y- YYDEl Next IkkrnG8 n)yqb 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ~n?U{
RmH Dim nameArray() As String, sampName As String u CXd%
CzE nameArray = Split(fList(0)," 0-0.txt") tH(Z9\L 7 sampName = nameArray(0) A}8U;<\Ig Print "" bc-"If Z& Print "Sample name: " & Chr(9) & sampName u|E,Wy1 EifYK 'Open an output file and write the FRED header data %{Gqhb=u\ Dim outFile As String X'Oo ogu outFile = cDir & sampName & "_FRED.txt" @gd-lcMYW Open outFile For Output As #1 @47TDCr Print #1, "type bsdf_data" 7^1ikmYY Print #1, "format angles=deg bsdf=value scale=1" ts
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+W!: QnqX/vnR 'Loop the file list, skip the two header lines and write the remaining data to file #AHIlUH"m Dim lineArray() As String, curLine As Long tB[K4GNSQ For Each curFile In fList r?$\`,; Print "Merging data from file " & curFile |kn}iA@72p ReadFile( cDir & curFile, lineArray ) ;8!D8o(+ For curLine = 2 To UBound(lineArray) < mxUgU Print #1, lineArray(curLine) _Uq'eZol Next P VPwYmte Next C/XOI> Tb[GZ,/%; 'Close the output file z9gZ/d Close #1 5g=" # tU(6%zvR Print "Finished merging RPC data for sample " & sampName wFe</U-'; Print "FRED formatted data file: " & Chr(9) & outFile m$kmoY/ End Sub WrV|<%EQh Rj8l]m6U9 'Utility function to read the contents of a file into an array of strings. 0
[s1!Cm!i Function ReadFile(ByVal fileName As String, _ +1rJ ;G ByRef lineArray() As String) As Long g$+3IVq& E'C[+iK6, ReadFile = -1 (mzyA%;W Dim oFSO As Object /w|YNDA]j Set oFSO = CreateObject("Scripting.FileSystemObject") *]rV,\z: Erase lineArray !"wIb.j}0 up`6IWlLE Dim fid As Long 3cnsJV] If oFSO.fileexists( fileName ) Then TnC'<zm9! fid = FreeFile() hAY_dM Open fileName For Input As fid N7NK1<vw2 lineArray = Split(Input(LOF(fid), fid), vbCrLf) vK$W)(Z Close fid d"V^^I)yx& End If u`ZnxD> Set oFSO = Nothing WA<~M)rb Return UBound( lineArray ) %T&kK2d; H;v*/~zl End Function % $J^dF_0 g,.iM8 Sub GetFileList( ByVal in_dir As String, _ jWm<!<~ ByRef in_flist() As String ) p4/D%*G^` /rquI y^ 'Redimension the file list array J[^-k!9M Erase in_flist O)hNHIF 6(eyUgnb 'Tracks how many files are found [ [Z*n/tr Dim fCount As Long wy7f7zIa fCount = 0 i6[Hu8 zfS`@{;F`| 'Recurse directory and search for text files /u?^s "C/ Dim f As String + 505 f = Dir$(in_dir & "*.txt") kw!! 5U;7 While f <> ""
G=wJz ReDim Preserve in_flist(fCount) x]F:~(P in_flist(fCount) = f #zfBNkk &@ fCount += 1 d!>PqPo f = Dir$() q$\KE4v" Wend ZM\Z2L]n ReDim Preserve in_flist(fCount-1) XXO
-c Mqq$ End Sub +"Ka #Z
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